{"id":41553,"date":"2025-06-03T16:21:35","date_gmt":"2025-06-03T08:21:35","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/41553.html"},"modified":"2025-06-03T16:21:35","modified_gmt":"2025-06-03T08:21:35","slug":"%e3%80%90%e8%ae%a1%e7%ae%97%e6%9c%ba%e7%bd%91%e7%bb%9c%e3%80%91linux%e4%b8%8b%e7%ae%80%e5%8d%95%e7%9a%84udp%e6%9c%8d%e5%8a%a1%e5%99%a8%ef%bc%88%e8%b6%85%e8%af%a6%e7%bb%86%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/41553.html","title":{"rendered":"\u3010\u8ba1\u7b97\u673a\u7f51\u7edc\u3011Linux\u4e0b\u7b80\u5355\u7684UDP\u670d\u52a1\u5668\uff08\u8d85\u8be6\u7ec6\uff09"},"content":{"rendered":"<h3>\u5957\u63a5\u5b57\u63a5\u53e3<\/h3>\n<p>\u6211\u4eec\u628a\u670d\u52a1\u5668\u5c01\u88c5\u6210\u4e00\u4e2a\u7c7b&#xff0c;\u5f53\u6211\u4eec\u5b9a\u4e49\u51fa\u4e00\u4e2a\u670d\u52a1\u5668\u5bf9\u8c61\u540e\u9700\u8981\u9a6c\u4e0a\u521d\u59cb\u5316\u670d\u52a1\u5668&#xff0c;\u800c\u521d\u59cb\u5316\u670d\u52a1\u5668\u9700\u8981\u505a\u7684\u7b2c\u4e00\u4ef6\u4e8b\u5c31\u662f\u521b\u5efa\u5957\u63a5\u5b57\u3002<\/p>\n<p>&#x1f30e;socket\u51fd\u6570<\/p>\n<p>\u8fd9\u662fLinux\u4e2d\u521b\u5efa\u5957\u63a5\u5b57\u7684\u7cfb\u7edf\u8c03\u7528,\u51fd\u6570\u539f\u578b\u5982\u4e0b:<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> domain<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> type<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> protocol<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53c2\u6570\u8bf4\u660e:<\/p>\n<ul>\n<li>domain&#xff1a;\u521b\u5efa\u5957\u63a5\u5b57\u7684\u57df\u6216\u8005\u53eb\u505a\u534f\u8bae\u5bb6\u65cf&#xff0c;\u4e5f\u5c31\u662f\u521b\u5efa\u5957\u63a5\u5b57\u7684\u7c7b\u578b\u3002\u8be5\u53c2\u6570\u5c31\u76f8\u5f53\u4e8estruct sockaddr\u7ed3\u6784\u7684\u524d16\u4e2a\u4f4d\u3002\u5982\u679c\u662f\u672c\u5730\u901a\u4fe1\u5c31\u8bbe\u7f6e\u4e3aAF_UNIX&#xff0c;\u5982\u679c\u662f\u7f51\u7edc\u901a\u4fe1\u5c31\u8bbe\u7f6e\u4e3aAF_INET&#xff08;IPv4&#xff09;\u6216AF_INET6&#xff08;IPv6&#xff09;\u3002<\/li>\n<li>type&#xff1a;\u521b\u5efa\u5957\u63a5\u5b57\u65f6\u6240\u9700\u7684\u670d\u52a1\u7c7b\u578b\u3002\u5176\u4e2d\u6700\u5e38\u89c1\u7684\u670d\u52a1\u7c7b\u578b\u662fSOCK_STREAM\u548cSOCK_DGRAM&#xff0c;\u5982\u679c\u662f\u57fa\u4e8eUDP\u7684\u7f51\u7edc\u901a\u4fe1&#xff0c;\u6211\u4eec\u91c7\u7528\u7684\u5c31\u662fSOCK_DGRAM&#xff0c;\u53eb\u505a\u7528\u6237\u6570\u636e\u62a5\u670d\u52a1&#xff0c;\u5982\u679c\u662f\u57fa\u4e8eTCP\u7684\u7f51\u7edc\u901a\u4fe1&#xff0c;\u6211\u4eec\u91c7\u7528\u7684\u5c31\u662fSOCK_STREAM&#xff0c;\u53eb\u505a\u6d41\u5f0f\u5957\u63a5\u5b57&#xff0c;\u63d0\u4f9b\u7684\u662f\u6d41\u5f0f\u670d\u52a1\u3002<\/li>\n<li>protocol&#xff1a;\u521b\u5efa\u5957\u63a5\u5b57\u7684\u534f\u8bae\u7c7b\u522b\u3002\u4f60\u53ef\u4ee5\u6307\u660e\u4e3aTCP\u6216UDP&#xff0c;\u4f46\u8be5\u5b57\u6bb5\u4e00\u822c\u76f4\u63a5\u8bbe\u7f6e\u4e3a0\u5c31\u53ef\u4ee5\u4e86&#xff0c;\u8bbe\u7f6e\u4e3a0\u8868\u793a\u7684\u5c31\u662f\u9ed8\u8ba4&#xff0c;\u6b64\u65f6\u4f1a\u6839\u636e\u4f20\u5165\u7684\u524d\u4e24\u4e2a\u53c2\u6570\u81ea\u52a8\u63a8\u5bfc\u51fa\u4f60\u6700\u7ec8\u9700\u8981\u4f7f\u7528\u7684\u662f\u54ea\u79cd\u534f\u8bae\u3002<\/li>\n<\/ul>\n<p>\u8fd4\u56de\u503c\u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>\u5957\u63a5\u5b57\u521b\u5efa\u6210\u529f\u8fd4\u56de\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u521b\u5efa\u5931\u8d25\u8fd4\u56de-1&#xff0c;\u540c\u65f6\u9519\u8bef\u7801\u4f1a\u88ab\u8bbe\u7f6e\u3002<\/li>\n<\/ul>\n<p>&#x1f30e;socket\u51fd\u6570\u5c5e\u4e8e\u4ec0\u4e48\u7c7b\u578b\u7684\u63a5\u53e3&#xff1f;<\/p>\n<p>\u7f51\u7edc\u534f\u8bae\u6808\u662f\u5206\u5c42\u7684&#xff0c;\u6309\u7167TCP\/IP\u56db\u5c42\u6a21\u578b\u6765\u8bf4&#xff0c;\u81ea\u9876\u5411\u4e0b\u4f9d\u6b21\u662f\u5e94\u7528\u5c42\u3001\u4f20\u8f93\u5c42\u3001\u7f51\u7edc\u5c42\u548c\u6570\u636e\u94fe\u8def\u5c42\u3002\u800c\u6211\u4eec\u73b0\u5728\u6240\u5199\u7684\u4ee3\u7801\u90fd\u53eb\u505a\u7528\u6237\u7ea7\u4ee3\u7801&#xff0c;\u4e5f\u5c31\u662f\u8bf4\u6211\u4eec\u662f\u5728\u5e94\u7528\u5c42\u7f16\u5199\u4ee3\u7801&#xff0c;\u56e0\u6b64\u6211\u4eec\u8c03\u7528\u7684\u5b9e\u9645\u662f\u4e0b\u4e09\u5c42\u7684\u63a5\u53e3&#xff0c;\u800c\u4f20\u8f93\u5c42\u548c\u7f51\u7edc\u5c42\u90fd\u662f\u5728\u64cd\u4f5c\u7cfb\u7edf\u5185\u5b8c\u6210\u7684&#xff0c;\u4e5f\u5c31\u610f\u5473\u7740\u6211\u4eec\u5728\u5e94\u7528\u5c42\u8c03\u7528\u7684\u63a5\u53e3\u90fd\u53eb\u505a\u7cfb\u7edf\u8c03\u7528\u63a5\u53e3\u3002<\/p>\n<p>&#x1f30e;socket\u51fd\u6570\u662f\u88ab\u8c01\u8c03\u7528\u7684&#xff1f;<\/p>\n<p>socket\u8fd9\u4e2a\u51fd\u6570\u662f\u88ab\u7a0b\u5e8f\u8c03\u7528\u7684&#xff0c;\u4f46\u5e76\u4e0d\u662f\u88ab\u7a0b\u5e8f\u5728\u7f16\u7801\u4e0a\u76f4\u63a5\u8c03\u7528\u7684&#xff0c;\u800c\u662f\u7a0b\u5e8f\u7f16\u7801\u5f62\u6210\u7684\u53ef\u6267\u884c\u7a0b\u5e8f\u8fd0\u884c\u8d77\u6765\u53d8\u6210\u8fdb\u7a0b&#xff0c;\u5f53\u8fd9\u4e2a\u8fdb\u7a0b\u88abCPU\u8c03\u5ea6\u6267\u884c\u5230socket\u51fd\u6570\u65f6&#xff0c;\u7136\u540e\u624d\u4f1a\u6267\u884c\u521b\u5efa\u5957\u63a5\u5b57\u7684\u4ee3\u7801&#xff0c;\u4e5f\u5c31\u662f\u8bf4socket\u51fd\u6570\u662f\u88ab\u8fdb\u7a0b\u6240\u8c03\u7528\u7684\u3002<\/p>\n<p>&#x1f30e;socket\u51fd\u6570\u5e95\u5c42\u505a\u4e86\u4ec0\u4e48&#xff1f;<\/p>\n<p>socket\u51fd\u6570\u4e0a\u9762\u8bf4\u5230\u662f\u88ab\u8fdb\u7a0b\u8c03\u7528\u7684&#xff0c;\u800c\u6bcf\u4e00\u4e2a\u8fdb\u7a0b\u5728\u7cfb\u7edf\u5c42\u9762\u6709\u4e00\u4e2a\u8fdb\u7a0b\u5730\u5740\u7a7a\u95f4PCB&#xff08;task_struct),\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868(files_struct)\u4ee5\u53ca\u5bf9\u5e94\u6253\u5f00\u7684\u5404\u79cd\u6587\u4ef6\u3002\u800c\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868\u91cc\u5305\u542b\u4e00\u4e2a\u6570\u7ec4fd_array&#xff0c;\u5176\u4e2d\u6570\u7ec4\u76840,1,2\u4e0b\u6807\u5206\u522b\u5bf9\u5e94&#xff0c;\u6807\u51c6\u8f93\u5165&#xff0c;\u6807\u51c6\u8f93\u51fa\u4ee5\u53ca\u6807\u51c6\u9519\u8bef\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603082130-683eb08a08bc4.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u5f53\u6211\u4eec\u8c03\u7528socket\u51fd\u6570\u521b\u5efa\u5957\u63a5\u5b57\u65f6&#xff0c;\u5b9e\u9645\u76f8\u5f53\u4e8e\u6211\u4eec\u6253\u5f00\u4e86\u4e00\u4e2a\u201c\u7f51\u7edc\u6587\u4ef6\u201d&#xff0c;\u6253\u5f00\u540e\u5728\u5185\u6838\u5c42\u9762\u4e0a\u5c31\u5f62\u6210\u4e86\u4e00\u4e2a\u5bf9\u5e94\u7684struct file\u7ed3\u6784\u4f53&#xff0c;\u540c\u65f6\u8be5\u7ed3\u6784\u4f53\u88ab\u8fde\u5165\u5230\u4e86\u8be5\u8fdb\u7a0b\u5bf9\u5e94\u7684\u6587\u4ef6\u53cc\u94fe\u8868&#xff0c;\u5e76\u5c06\u8be5\u7ed3\u6784\u4f53\u7684\u9996\u5730\u5740\u586b\u5165\u5230\u4e86fd_array\u6570\u7ec4\u5f53\u4e2d\u4e0b\u6807\u4e3a3\u7684\u4f4d\u7f6e&#xff0c;\u6b64\u65f6fd_array\u6570\u7ec4\u4e2d\u4e0b\u6807\u4e3a3\u7684\u6307\u9488\u5c31\u6307\u5411\u4e86\u8fd9\u4e2a\u6253\u5f00\u7684\u201c\u7f51\u7edc\u6587\u4ef6\u201d&#xff0c;\u6700\u540e3\u53f7\u6587\u4ef6\u63cf\u8ff0\u7b26\u4f5c\u4e3asocket\u51fd\u6570\u7684\u8fd4\u56de\u503c\u8fd4\u56de\u7ed9\u4e86\u7528\u6237\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603082130-683eb08a835d0.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u6bcf\u4e00\u4e2astruct file\u7ed3\u6784\u4f53\u4e2d\u5305\u542b\u7684\u5c31\u662f\u5bf9\u5e94\u6253\u5f00\u6587\u4ef6\u5404\u79cd\u4fe1\u606f&#xff0c;\u6bd4\u5982\u6587\u4ef6\u7684\u5c5e\u6027\u4fe1\u606f\u3001\u64cd\u4f5c\u65b9\u6cd5\u4ee5\u53ca\u6587\u4ef6\u7f13\u51b2\u533a\u7b49\u3002\u5176\u4e2d\u6587\u4ef6\u5bf9\u5e94\u7684\u5c5e\u6027\u5728\u5185\u6838\u5f53\u4e2d\u662f\u7531struct inode\u7ed3\u6784\u4f53\u6765\u7ef4\u62a4\u7684&#xff0c;\u800c\u6587\u4ef6\u5bf9\u5e94\u7684\u64cd\u4f5c\u65b9\u6cd5\u5b9e\u9645\u5c31\u662f\u4e00\u5806\u7684\u51fd\u6570\u6307\u9488&#xff08;\u6bd4\u5982read\u548cwrite&#xff09;\u5728\u5185\u6838\u5f53\u4e2d\u5c31\u662f\u7531struct file_operations\u7ed3\u6784\u4f53\u6765\u7ef4\u62a4\u7684\u3002\u800c\u6587\u4ef6\u7f13\u51b2\u533a\u5bf9\u4e8e\u6253\u5f00\u7684\u666e\u901a\u6587\u4ef6\u6765\u8bf4\u5bf9\u5e94\u7684\u4e00\u822c\u662f\u78c1\u76d8&#xff0c;\u4f46\u5bf9\u4e8e\u73b0\u5728\u6253\u5f00\u7684\u201c\u7f51\u7edc\u6587\u4ef6\u201d\u6765\u8bf4&#xff0c;\u8fd9\u91cc\u7684\u6587\u4ef6\u7f13\u51b2\u533a\u5bf9\u5e94\u7684\u5c31\u662f\u7f51\u5361\u3002<\/p>\n<p>\u5bf9\u4e8e\u4e00\u822c\u7684\u666e\u901a\u6587\u4ef6\u6765\u8bf4&#xff0c;\u5f53\u7528\u6237\u901a\u8fc7\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c06\u6570\u636e\u5199\u5230\u6587\u4ef6\u7f13\u51b2\u533a&#xff0c;\u7136\u540e\u518d\u628a\u6570\u636e\u5237\u5230\u78c1\u76d8\u4e0a\u5c31\u5b8c\u6210\u4e86\u6570\u636e\u7684\u5199\u5165\u64cd\u4f5c\u3002\u800c\u5bf9\u4e8e\u73b0\u5728socket\u51fd\u6570\u6253\u5f00\u7684\u201c\u7f51\u7edc\u6587\u4ef6\u201d\u6765\u8bf4&#xff0c;\u5f53\u7528\u6237\u5c06\u6570\u636e\u5199\u5230\u6587\u4ef6\u7f13\u51b2\u533a\u540e&#xff0c;\u64cd\u4f5c\u7cfb\u7edf\u4f1a\u5b9a\u671f\u5c06\u6570\u636e\u5237\u5230\u7f51\u5361\u91cc\u9762&#xff0c;\u800c\u7f51\u5361\u5219\u662f\u8d1f\u8d23\u6570\u636e\u53d1\u9001\u7684&#xff0c;\u56e0\u6b64\u6570\u636e\u6700\u7ec8\u5c31\u53d1\u9001\u5230\u4e86\u7f51\u7edc\u5f53\u4e2d\u3002<\/p>\n<p>&#x1f30e;\u670d\u52a1\u7aef\u521b\u5efa\u5957\u63a5\u5b57<\/p>\n<p>\u6211\u4eec\u521d\u59cb\u5316\u670d\u52a1\u5668\u521b\u5efa\u5957\u63a5\u5b57\u65f6&#xff0c;\u7b2c\u4e00\u4e2a\u53c2\u6570\u9700\u8981\u586b\u5165\u7684\u5c31\u662fAF_INET,\u8868\u660e\u6211\u4eec\u8981\u8fdb\u884c\u7f51\u7edc\u901a\u4fe1&#xff0c;\u56e0\u4e3a\u6211\u4eec\u662fUDP\u670d\u52a1\u5668&#xff0c;\u9762\u5411\u6570\u636e\u62a5\u7684&#xff0c;\u6240\u4ee5\u586b\u5165SOCK_DGRAM&#xff0c;\u7b2c\u4e09\u4e2a\u53c2\u6570\u534f\u8bae\u9009\u62e9&#xff0c;\u53ef\u4ee5\u81ea\u884c\u9009\u62e9UDP\u534f\u8bae&#xff0c;\u4e5f\u53ef\u4ee5\u4f20\u51650&#xff0c;\u8ba9socket\u6839\u636e\u7b2c\u4e8c\u4e2a\u53c2\u6570\u81ea\u52a8\u8bc6\u522b\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/socket.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/types.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UdpServer<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token comment\">\/\/\u670d\u52a1\u5668\u521d\u59cb\u5316<\/span><br \/>\n    <span class=\"token keyword\">bool<\/span> <span class=\"token function\">InitServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/AF_INET,\u8868\u660e\u9700\u8981\u7f51\u7edc\u901a\u4fe1<\/span><br \/>\n        <span class=\"token comment\">\/\/SOCK_DGRAM,\u9762\u5411\u6570\u636e\u62a5<\/span><br \/>\n        <span class=\"token comment\">\/\/0&#xff0c;\u9ed8\u8ba4&#xff0c;\u6839\u636e\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a\u9762\u5411\u6570\u636e\u62a5&#xff0c;\u81ea\u52a8\u8bc6\u522b\u4e3aUDP\u534f\u8bae<\/span><br \/>\n        _sockfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span>SOCK_DGRAM<span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;socket create error!!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;socket create success,sockfd : &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> _sockfd <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token operator\">~<\/span><span class=\"token function\">UdpServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> _sockfd<span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a; \u5f53\u6790\u6784\u670d\u52a1\u5668\u65f6&#xff0c;\u6211\u4eec\u53ef\u4ee5\u5c06sockfd\u5bf9\u5e94\u7684\u6587\u4ef6\u8fdb\u884c\u5173\u95ed&#xff0c;\u4f46\u5b9e\u9645\u4e0a\u4e0d\u8fdb\u884c\u8be5\u64cd\u4f5c\u4e5f\u884c&#xff0c;\u56e0\u4e3a\u4e00\u822c\u670d\u52a1\u5668\u8fd0\u884c\u540e\u662f\u5c31\u4e0d\u4f1a\u505c\u4e0b\u6765\u7684\u3002<\/p>\n<p>\u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u505a\u4e00\u4e2a\u7b80\u5355\u7684\u6d4b\u8bd5&#xff0c;\u770b\u770b\u5957\u63a5\u5b57\u662f\u5426\u521b\u5efa\u6210\u529f\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    UdpServer<span class=\"token operator\">*<\/span> srv <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token function\">UdpServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    srv<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">InitServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd0\u884c\u7a0b\u5e8f\u540e\u53ef\u4ee5\u770b\u5230\u5957\u63a5\u5b57\u662f\u521b\u5efa\u6210\u529f\u7684&#xff0c;\u5bf9\u5e94\u83b7\u53d6\u5230\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u662f3&#xff0c;\u8fd9\u4e5f\u5f88\u597d\u7406\u89e3&#xff0c;\u56e0\u4e3a0\u30011\u30012\u9ed8\u8ba4\u88ab\u6807\u51c6\u8f93\u5165\u6d41\u3001\u6807\u51c6\u8f93\u51fa\u6d41\u548c\u6807\u51c6\u9519\u8bef\u6d41\u5360\u7528\u4e86&#xff0c;\u6b64\u65f6\u6700\u5c0f\u7684\u3001\u672a\u88ab\u5229\u7528\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u662f3\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603082131-683eb08b1e2e7.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>UDP\u670d\u52a1\u5668\u7aef\u548c\u5ba2\u6237\u7aef\u5747\u53ea\u97001\u4e2a\u5957\u63a5\u5b57&#xff1a;TCP \u4e2d&#xff0c;\u5957\u63a5\u5b57\u662f\u4e00\u5bf9\u4e00\u7684\u5173\u7cfb\u3002\u5982\u8981\u5411 10 \u4e2a\u5ba2\u6237\u7aef\u63d0\u4f9b\u670d\u52a1&#xff0c;\u90a3\u4e48\u9664\u4e86\u8d1f\u8d23\u76d1\u542c\u7684\u5957\u63a5\u5b57\u5916&#xff0c;\u8fd8\u9700\u8981\u521b\u5efa 10 \u5957\u63a5\u5b57\u3002\u4f46\u5728 UDP \u4e2d&#xff0c;\u4e0d\u7ba1\u662f\u670d\u52a1\u5668\u7aef\u8fd8\u662f\u5ba2\u6237\u7aef\u90fd\u53ea\u9700\u8981 1 \u4e2a\u5957\u63a5\u5b57\u3002\u4e3e\u4e2a\u4f8b\u5b50&#xff0c;\u8d1f\u8d23\u90ae\u5bc4\u5305\u88f9\u7684\u5feb\u9012\u516c\u53f8\u53ef\u4ee5\u6bd4\u55bb\u4e3a UDP \u5957\u63a5\u5b57&#xff0c;\u53ea\u8981\u6709 1 \u4e2a\u5feb\u9012\u516c\u53f8&#xff0c;\u5c31\u53ef\u4ee5\u901a\u8fc7\u5b83\u5411\u4efb\u610f\u5730\u5740\u90ae\u5bc4\u5305\u88f9\u3002\u540c\u6837&#xff0c;\u53ea\u9700 1 \u4e2a UDP \u5957\u63a5\u5b57\u5c31\u53ef\u4ee5\u5411\u4efb\u610f\u4e3b\u673a\u4f20\u9001\u6570\u636e\u3002<\/p>\n<h3>\u670d\u52a1\u7aef\u7ed1\u5b9a<\/h3>\n<p>\u73b0\u5728\u5957\u63a5\u5b57\u5df2\u7ecf\u521b\u5efa\u6210\u529f\u4e86&#xff0c;\u4f46\u4f5c\u4e3a\u4e00\u6b3e\u670d\u52a1\u5668\u6765\u8bb2&#xff0c;\u5982\u679c\u53ea\u662f\u628a\u5957\u63a5\u5b57\u521b\u5efa\u597d\u4e86&#xff0c;\u90a3\u6211\u4eec\u4e5f\u53ea\u662f\u5728\u7cfb\u7edf\u5c42\u9762\u4e0a\u6253\u5f00\u4e86\u4e00\u4e2a\u6587\u4ef6&#xff0c;\u64cd\u4f5c\u7cfb\u7edf\u5c06\u6765\u5e76\u4e0d\u77e5\u9053\u662f\u8981\u5c06\u6570\u636e\u5199\u5165\u5230\u78c1\u76d8\u8fd8\u662f\u5237\u5230\u7f51\u5361&#xff0c;\u6b64\u65f6\u8be5\u6587\u4ef6\u8fd8\u6ca1\u6709\u4e0e\u7f51\u7edc\u5173\u8054\u8d77\u6765\u3002<\/p>\n<p>UDP\u4e2d\u7684\u670d\u52a1\u5668\u7aef\u548c\u5ba2\u6237\u7aef\u6ca1\u6709\u8fde\u63a5&#xff0c;UDP \u4e0d\u50cf TCP&#xff0c;\u65e0\u9700\u5728\u8fde\u63a5\u72b6\u6001\u4e0b\u4ea4\u6362\u6570\u636e&#xff0c;\u56e0\u6b64\u57fa\u4e8e UDP \u7684\u670d\u52a1\u5668\u7aef\u548c\u5ba2\u6237\u7aef\u4e5f\u65e0\u9700\u7ecf\u8fc7\u8fde\u63a5\u8fc7\u7a0b\u3002\u4e5f\u5c31\u662f\u8bf4&#xff0c;\u4e0d\u5fc5\u8c03\u7528 listen() \u548c accept() \u51fd\u6570\u3002UDP \u4e2d\u53ea\u6709\u521b\u5efa\u5957\u63a5\u5b57\u7684\u8fc7\u7a0b\u548c\u6570\u636e\u4ea4\u6362\u7684\u8fc7\u7a0b\u3002<\/p>\n<p>\u7531\u4e8e\u73b0\u5728\u7f16\u5199\u7684\u662f\u4e0d\u9762\u5411\u8fde\u63a5\u7684UDP\u670d\u52a1\u5668&#xff0c;\u6240\u4ee5\u521d\u59cb\u5316\u670d\u52a1\u5668\u8981\u505a\u7684\u7b2c\u4e8c\u4ef6\u4e8b\u5c31\u662f\u7ed1\u5b9a\u3002<\/p>\n<p>&#x1f30e;bind\u51fd\u6570<\/p>\n<p>\u7ed1\u5b9a\u7684\u51fd\u6570\u53eb\u505abind&#xff0c;\u6ce8\u610f\u5b83\u8ddfc&#043;&#043;\u7684bind\u51fd\u6570\u53ea\u662f\u540c\u540d&#xff0c;\u529f\u80fd\u4e0a\u6ca1\u6709\u4efb\u4f55\u5173\u8054&#xff0c;\u8be5\u51fd\u6570\u7684\u51fd\u6570\u539f\u578b\u5982\u4e0b&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> sockfd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token operator\">*<\/span>addr<span class=\"token punctuation\">,<\/span> socklen_t addrlen<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53c2\u6570\u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>sockfd&#xff1a;\u7ed1\u5b9a\u7684\u6587\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002\u4e5f\u5c31\u662f\u6211\u4eec\u521b\u5efa\u5957\u63a5\u5b57\u65f6\u83b7\u53d6\u5230\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n<li>addr&#xff1a;\u7f51\u7edc\u76f8\u5173\u7684\u5c5e\u6027\u4fe1\u606f&#xff0c;\u5305\u62ec\u534f\u8bae\u5bb6\u65cf\u3001IP\u5730\u5740\u3001\u7aef\u53e3\u53f7\u7b49\u3002<\/li>\n<li>addrlen&#xff1a;\u4f20\u5165\u7684addr\u7ed3\u6784\u4f53\u7684\u957f\u5ea6\u3002<\/li>\n<\/ul>\n<p>\u8fd4\u56de\u503c\u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>\u7ed1\u5b9a\u6210\u529f\u8fd4\u56de0&#xff0c;\u7ed1\u5b9a\u5931\u8d25\u8fd4\u56de-1&#xff0c;\u540c\u65f6\u9519\u8bef\u7801\u4f1a\u88ab\u8bbe\u7f6e\u3002<\/li>\n<\/ul>\n<p>&#x1f30e;struct sockaddr_in\u7ed3\u6784\u4f53<\/p>\n<p>\u5728\u7ed1\u5b9a\u65f6\u9700\u8981\u5c06\u7f51\u7edc\u76f8\u5173\u7684\u5c5e\u6027\u4fe1\u606f\u586b\u5145\u5230\u4e00\u4e2a\u7ed3\u6784\u4f53\u5f53\u4e2d&#xff0c;\u8fd9\u91cc\u5e94\u8be5\u586b\u5165\u4e00\u4e2astruct sockaddr\u7ed3\u6784\u4f53\u6307\u9488&#xff0c;\u4f46\u6211\u4eec\u5e94\u8be5\u5148\u521b\u5efastruct sockaddr_in\u8fd9\u4e2a\u7ed3\u6784\u4f53&#xff0c;\u518d\u5c06\u5176\u5f3a\u8f6c\u5230struct sockaddr*\u586b\u5165&#xff0c;\u5177\u4f53\u539f\u56e0\u6211\u7684\u4e0a\u7bc7\u535a\u5ba2\u5bf9\u8fd9\u4e24\u4e2a\u7ed3\u6784\u4f53\u89e3\u91ca\u5f97\u5f88\u6e05\u695a\u3002 \u9644\u4e0a\u8fde\u63a5&#xff1a;\u70b9\u51fb\u8df3\u8f6c\u5230\u6211\u7684\u4e0a\u7bc7\u535a\u5ba2<\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u7528grep\u547d\u4ee4\u5728\/usr\/include\u76ee\u5f55\u4e0b\u67e5\u627e\u8be5\u7ed3\u6784&#xff0c;\u6b64\u65f6\u5c31\u53ef\u4ee5\u627e\u5230\u5b9a\u4e49\u8be5\u7ed3\u6784\u7684\u6587\u4ef6\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603082131-683eb08b27889.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u53ef\u4ee5\u53d1\u73b0\u5728\u7ed3\u6784\u4f53\u5728\/usr\/include\/linux\/in.h\u6587\u4ef6\u4e2d&#xff0c;\u9700\u8981\u6ce8\u610f\u7684\u662f&#xff0c;struct sockaddr_in\u5c5e\u4e8e\u7cfb\u7edf\u7ea7\u7684\u6982\u5ff5&#xff0c;\u4e0d\u540c\u7684\u5e73\u53f0\u63a5\u53e3\u8bbe\u8ba1\u53ef\u80fd\u4f1a\u6709\u70b9\u5dee\u522b\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603082131-683eb08b32eff.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u53ef\u4ee5\u770b\u5230&#xff0c;struct sockaddr_in\u5f53\u4e2d\u7684\u6210\u5458\u5982\u4e0b&#xff1a;<\/p>\n<ul>\n<li>sin_family&#xff1a;\u8868\u793a\u534f\u8bae\u5bb6\u65cf\u3002<\/li>\n<li>sin_port&#xff1a;\u8868\u793a\u7aef\u53e3\u53f7&#xff0c;\u662f\u4e00\u4e2a16\u4f4d\u7684\u6574\u6570\u3002<\/li>\n<li>sin_addr&#xff1a;\u8868\u793aIP\u5730\u5740&#xff0c;\u662f\u4e00\u4e2a32\u4f4d\u7684\u6574\u6570\u3002<\/li>\n<\/ul>\n<p>\u5269\u4e0b\u7684\u5b57\u6bb5\u4e00\u822c\u4e0d\u505a\u5904\u7406&#xff0c;\u5f53\u7136\u4f60\u4e5f\u53ef\u4ee5\u8fdb\u884c\u521d\u59cb\u5316\u3002<\/p>\n<p>\u5176\u4e2dsin_addr\u7684\u7c7b\u578b\u662fstruct in_addr&#xff0c;\u5b9e\u9645\u8be5\u7ed3\u6784\u4f53\u5f53\u4e2d\u5c31\u53ea\u6709\u4e00\u4e2a\u6210\u5458&#xff0c;\u8be5\u6210\u5458\u5c31\u662f\u4e00\u4e2a32\u4f4d\u7684\u6574\u6570&#xff0c;IP\u5730\u5740\u5b9e\u9645\u5c31\u662f\u5b58\u50a8\u5728\u8fd9\u4e2a\u6574\u6570\u5f53\u4e2d\u7684\u3002<\/p>\n<p>&#x1f30e;\u5982\u4f55\u7406\u89e3\u7ed1\u5b9a&#xff1f;<\/p>\n<p>\u5728\u8fdb\u884c\u7ed1\u5b9a\u7684\u65f6\u5019\u9700\u8981\u5c06IP\u5730\u5740\u548c\u7aef\u53e3\u53f7\u544a\u8bc9\u5bf9\u5e94\u7684\u7f51\u7edc\u6587\u4ef6&#xff0c;\u6b64\u65f6\u5c31\u53ef\u4ee5\u6539\u53d8\u7f51\u7edc\u6587\u4ef6\u5f53\u4e2d\u6587\u4ef6\u64cd\u4f5c\u51fd\u6570\u7684\u6307\u5411&#xff0c;\u5c06\u5bf9\u5e94\u7684\u64cd\u4f5c\u51fd\u6570\u6539\u4e3a\u5bf9\u5e94\u7f51\u5361\u7684\u64cd\u4f5c\u65b9\u6cd5&#xff0c;\u6b64\u65f6\u8bfb\u6570\u636e\u548c\u5199\u6570\u636e\u5bf9\u5e94\u7684\u64cd\u4f5c\u5bf9\u8c61\u5c31\u662f\u7f51\u5361\u4e86&#xff0c;\u6240\u4ee5\u7ed1\u5b9a\u5b9e\u9645\u4e0a\u5c31\u662f\u5c06\u6587\u4ef6\u548c\u7f51\u7edc\u5173\u8054\u8d77\u6765\u3002<\/p>\n<p>&#x1f30e;\u589e\u52a0IP\u5730\u5740\u548c\u7aef\u53e3\u53f7<\/p>\n<p>\u7531\u4e8e\u7ed1\u5b9a\u65f6\u9700\u8981\u7528\u5230IP\u5730\u5740\u548c\u7aef\u53e3\u53f7&#xff0c;\u56e0\u6b64\u6211\u4eec\u9700\u8981\u5728\u670d\u52a1\u5668\u7c7b\u5f53\u4e2d\u5f15\u5165IP\u5730\u5740\u548c\u7aef\u53e3\u53f7&#xff0c;\u5728\u521b\u5efa\u670d\u52a1\u5668\u5bf9\u8c61\u65f6\u9700\u8981\u4f20\u5165\u5bf9\u5e94\u7684IP\u5730\u5740\u548c\u7aef\u53e3\u53f7&#xff0c;\u6b64\u65f6\u6211\u4eec\u5c31\u53ef\u4ee5\u6839\u636e\u4f20\u5165\u7684IP\u5730\u5740\u548c\u7aef\u53e3\u53f7\u5bf9\u5bf9\u5e94\u7684\u6210\u5458\u8fdb\u884c\u521d\u59cb\u5316\u3002<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UdpServer<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">UdpServer<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span>string ip<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">uint16_t<\/span> port<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token operator\">:<\/span><span class=\"token function\">_sockfd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">,<\/span><span class=\"token function\">_port<\/span><span class=\"token punctuation\">(<\/span>port<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">,<\/span><span class=\"token function\">_ip<\/span><span class=\"token punctuation\">(<\/span>ip<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token comment\">\/\/\u670d\u52a1\u5668\u521d\u59cb\u5316<\/span><br \/>\n    <span class=\"token keyword\">bool<\/span> <span class=\"token function\">InitServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/AF_INET,\u8868\u660e\u9700\u8981\u7f51\u7edc\u901a\u4fe1<\/span><br \/>\n        <span class=\"token comment\">\/\/SOCK_DGRAM,\u9762\u5411\u6570\u636e\u62a5<\/span><br \/>\n        <span class=\"token comment\">\/\/0&#xff0c;\u9ed8\u8ba4&#xff0c;\u6839\u636e\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a\u9762\u5411\u6570\u636e\u62a5&#xff0c;\u81ea\u52a8\u8bc6\u522b\u4e3aUDP\u534f\u8bae<\/span><br \/>\n        _sockfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span>SOCK_DGRAM<span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;socket create error!!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;socket create success,sockfd : &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> _sockfd <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token operator\">~<\/span><span class=\"token function\">UdpServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> _sockfd<span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> _port<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/\u7aef\u53e3\u53f7<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string _ip<span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/IP\u5730\u5740<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>&#x1f30e;\u670d\u52a1\u7aef\u7ed1\u5b9a<\/p>\n<p>\u7ed1\u5b9a\u4e4b\u524d&#xff0c;\u9700\u8981\u6ce8\u610f\u7684\u662f&#xff0c;\u5728\u53d1\u9001\u5230\u7f51\u7edc\u4e4b\u524d\u9700\u8981\u5c06\u7aef\u53e3\u53f7\u8bbe\u7f6e\u4e3a\u7f51\u7edc\u5e8f\u5217&#xff0c;\u7531\u4e8e\u7aef\u53e3\u53f7\u662f16\u4f4d\u7684&#xff0c;\u56e0\u6b64\u6211\u4eec\u9700\u8981\u4f7f\u7528htons\u51fd\u6570\u5c06\u7aef\u53e3\u53f7\u8f6c\u4e3a\u7f51\u7edc\u5e8f\u5217\u3002\u6b64\u5916&#xff0c;\u7531\u4e8e\u7f51\u7edc\u5f53\u4e2d\u4f20\u8f93\u7684\u662f\u6574\u6570IP&#xff0c;\u6211\u4eec\u9700\u8981\u8c03\u7528inet_addr\u51fd\u6570\u5c06\u5b57\u7b26\u4e32IP\u8f6c\u6362\u6210\u6574\u6570IP&#xff0c;\u7136\u540e\u518d\u5c06\u8f6c\u6362\u540e\u7684\u6574\u6570IP\u8fdb\u884c\u8bbe\u7f6e\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/socket.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/types.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdint.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;memory&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;cstring&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;netinet\/in.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;arpa\/inet.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UdpServer<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">UdpServer<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span>string ip<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">uint16_t<\/span> port<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token operator\">:<\/span><span class=\"token function\">_sockfd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">,<\/span><span class=\"token function\">_port<\/span><span class=\"token punctuation\">(<\/span>port<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">,<\/span><span class=\"token function\">_ip<\/span><span class=\"token punctuation\">(<\/span>ip<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token comment\">\/\/\u670d\u52a1\u5668\u521d\u59cb\u5316<\/span><br \/>\n    <span class=\"token keyword\">bool<\/span> <span class=\"token function\">InitServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/AF_INET,\u8868\u660e\u9700\u8981\u7f51\u7edc\u901a\u4fe1<\/span><br \/>\n        <span class=\"token comment\">\/\/SOCK_DGRAM,\u9762\u5411\u6570\u636e\u62a5<\/span><br \/>\n        <span class=\"token comment\">\/\/0&#xff0c;\u9ed8\u8ba4&#xff0c;\u6839\u636e\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a\u9762\u5411\u6570\u636e\u62a5&#xff0c;\u81ea\u52a8\u8bc6\u522b\u4e3aUDP\u534f\u8bae<\/span><br \/>\n        _sockfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span>SOCK_DGRAM<span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;socket create error!!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;socket create success,sockfd : &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> _sockfd <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/\u586b\u5145\u7f51\u7edc\u901a\u4fe1\u76f8\u5173\u4fe1\u606f<\/span><br \/>\n        <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> local<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>local<span class=\"token punctuation\">,<\/span><span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        local<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n        local<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span>_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        local<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">inet_addr<\/span><span class=\"token punctuation\">(<\/span>_ip<span class=\"token punctuation\">.<\/span><span class=\"token function\">c_str<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/\u7ed1\u5b9a<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>local<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;bind error!!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;bind success &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token operator\">~<\/span><span class=\"token function\">UdpServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> _sockfd<span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> _port<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/\u7aef\u53e3\u53f7<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string _ip<span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/IP\u5730\u5740<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>\u5b57\u7b26\u4e32IP VS \u6574\u6570IP<\/h3>\n<p>IP\u5730\u5740\u7684\u8868\u73b0\u5f62\u5f0f\u6709\u4e24\u79cd&#xff1a;<\/p>\n<ul>\n<li>\u5b57\u7b26\u4e32IP&#xff1a;\u7c7b\u4f3c\u4e8e192.168.233.123\u8fd9\u79cd\u5b57\u7b26\u4e32\u5f62\u5f0f\u7684IP\u5730\u5740&#xff0c;\u53eb\u505a\u57fa\u4e8e\u5b57\u7b26\u4e32\u7684\u70b9\u5206\u5341\u8fdb\u5236IP\u5730\u5740\u3002<\/li>\n<li>\u6574\u6570IP&#xff1a;IP\u5730\u5740\u5728\u8fdb\u884c\u7f51\u7edc\u4f20\u8f93\u65f6\u6240\u7528\u7684\u5f62\u5f0f&#xff0c;\u7528\u4e00\u4e2a32\u4f4d\u7684\u6574\u6570\u6765\u8868\u793aIP\u5730\u5740\u3002<\/li>\n<\/ul>\n<p>&#x1f30e;\u6574\u6570IP\u5b58\u5728\u7684\u610f\u4e49<\/p>\n<p>\u7f51\u7edc\u4f20\u8f93\u6570\u636e\u65f6\u662f\u5bf8\u571f\u5bf8\u91d1\u7684&#xff0c;\u5982\u679c\u6211\u4eec\u5728\u7f51\u7edc\u4f20\u8f93\u65f6\u76f4\u63a5\u4ee5\u57fa\u4e8e\u5b57\u7b26\u4e32\u7684\u70b9\u5206\u5341\u8fdb\u5236IP\u7684\u5f62\u5f0f\u8fdb\u884cIP\u5730\u5740\u7684\u4f20\u9001&#xff0c;\u90a3\u4e48\u6b64\u65f6\u4e00\u4e2aIP\u5730\u5740\u81f3\u5c11\u5c31\u9700\u898115\u4e2a\u5b57\u8282&#xff0c;\u4f46\u5b9e\u9645\u5e76\u4e0d\u9700\u8981\u8017\u8d39\u8fd9\u4e48\u591a\u5b57\u8282\u3002<\/p>\n<p>IP\u5730\u5740\u5b9e\u9645\u53ef\u4ee5\u5212\u5206\u4e3a\u56db\u4e2a\u533a\u57df&#xff0c;\u5176\u4e2d\u6bcf\u4e00\u4e2a\u533a\u57df\u7684\u53d6\u503c\u90fd\u662f0~255&#xff0c;\u800c\u8fd9\u4e2a\u8303\u56f4\u7684\u6570\u5b57\u53ea\u9700\u8981\u75288\u4e2a\u6bd4\u7279\u4f4d\u5c31\u80fd\u8868\u793a&#xff0c;\u56e0\u6b64\u6211\u4eec\u5b9e\u9645\u53ea\u9700\u898132\u4e2a\u6bd4\u7279\u4f4d\u5c31\u80fd\u591f\u8868\u793a\u4e00\u4e2aIP\u5730\u5740\u3002\u5176\u4e2d\u8fd9\u4e2a32\u4f4d\u7684\u6574\u6570\u7684\u6bcf\u4e00\u4e2a\u5b57\u8282\u5bf9\u5e94\u7684\u5c31\u662fIP\u5730\u5740\u4e2d\u7684\u67d0\u4e2a\u533a\u57df&#xff0c;\u6211\u4eec\u5c06IP\u5730\u5740\u7684\u8fd9\u79cd\u8868\u793a\u65b9\u6cd5\u79f0\u4e4b\u4e3a\u6574\u6570IP&#xff0c;\u6b64\u65f6\u8868\u793a\u4e00\u4e2aIP\u5730\u5740\u53ea\u9700\u89814\u4e2a\u5b57\u8282\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603082131-683eb08b4eab0.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u56e0\u4e3a\u91c7\u7528\u6574\u6570IP\u7684\u65b9\u6848\u8868\u793a\u4e00\u4e2aIP\u5730\u5740\u53ea\u9700\u89814\u4e2a\u5b57\u8282&#xff0c;\u5e76\u4e14\u5728\u7f51\u7edc\u901a\u4fe1\u4e5f\u80fd\u8868\u793a\u540c\u6837\u7684\u542b\u4e49&#xff0c;\u56e0\u6b64\u5728\u7f51\u7edc\u901a\u4fe1\u65f6\u5c31\u6ca1\u6709\u7528\u5b57\u7b26\u4e32IP\u800c\u7528\u7684\u662f\u6574\u6570IP&#xff0c;\u56e0\u4e3a\u8fd9\u6837\u80fd\u591f\u51cf\u5c11\u7f51\u7edc\u901a\u4fe1\u65f6\u6570\u636e\u7684\u4f20\u9001\u3002<\/p>\n<p>&#x1f30e;\u5b57\u7b26\u4e32IP\u548c\u6574\u6570IP\u76f8\u4e92\u8f6c\u6362\u7684\u65b9\u5f0f<\/p>\n<p>\u8f6c\u6362\u7684\u65b9\u5f0f\u6709\u5f88\u591a&#xff0c;\u6bd4\u5982\u6211\u4eec\u53ef\u4ee5\u5b9a\u4e49\u4e00\u4e2a\u4f4d\u6bb5A&#xff0c;\u4f4d\u6bb5A\u5f53\u4e2d\u6709\u56db\u4e2a\u6210\u5458&#xff0c;\u6bcf\u4e2a\u6210\u5458\u7684\u5927\u5c0f\u90fd\u662f8\u4e2a\u6bd4\u7279\u4f4d&#xff0c;\u8fd9\u56db\u4e2a\u6210\u5458\u5c31\u4f9d\u6b21\u8868\u793aIP\u5730\u5740\u7684\u56db\u4e2a\u533a\u57df&#xff0c;\u4e00\u517132\u4e2a\u6bd4\u7279\u4f4d\u3002<\/p>\n<p>\u7136\u540e\u6211\u4eec\u518d\u5b9a\u4e49\u4e00\u4e2a\u8054\u5408\u4f53IP&#xff0c;\u8be5\u8054\u5408\u4f53\u5f53\u4e2d\u6709\u4e24\u4e2a\u6210\u5458&#xff0c;\u5176\u4e2d\u4e00\u4e2a\u662f32\u4f4d\u7684\u6574\u6570&#xff0c;\u5176\u4ee3\u8868\u7684\u5c31\u662f\u6574\u6570IP&#xff0c;\u8fd8\u6709\u4e00\u4e2a\u5c31\u662f\u4f4d\u6bb5A\u7c7b\u578b\u7684\u6210\u5458&#xff0c;\u5176\u4ee3\u8868\u7684\u5c31\u662f\u5b57\u7b26\u4e32IP\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603082131-683eb08bb288e.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u7531\u4e8e\u8054\u5408\u4f53\u7684\u7a7a\u95f4\u662f\u6210\u5458\u5171\u4eab\u7684&#xff0c;\u56e0\u6b64\u6211\u4eec\u8bbe\u7f6eIP\u548c\u8bfb\u53d6IP\u7684\u65b9\u5f0f\u5982\u4e0b&#xff1a;<\/p>\n<ul>\n<li>\u5f53\u6211\u4eec\u60f3\u4ee5\u6574\u6570IP\u7684\u5f62\u5f0f\u8bbe\u7f6eIP\u65f6&#xff0c;\u76f4\u63a5\u5c06\u5176\u8d4b\u503c\u7ed9\u8054\u5408\u4f53\u7684\u7b2c\u4e00\u4e2a\u6210\u5458\u5c31\u884c\u4e86\u3002<\/li>\n<li>\u5f53\u6211\u4eec\u60f3\u4ee5\u5b57\u7b26\u4e32IP\u7684\u5f62\u5f0f\u8bbe\u7f6eIP\u65f6&#xff0c;\u5148\u5c06\u5b57\u7b26\u4e32\u5206\u6210\u5bf9\u5e94\u7684\u56db\u90e8\u5206&#xff0c;\u7136\u540e\u5c06\u6bcf\u90e8\u5206\u8f6c\u6362\u6210\u5bf9\u5e94\u7684\u4e8c\u8fdb\u5236\u5e8f\u5217\u4f9d\u6b21\u8bbe\u7f6e\u5230\u8054\u5408\u4f53\u4e2d\u7b2c\u4e8c\u4e2a\u6210\u5458\u5f53\u4e2d\u7684p1\u3001p2\u3001p3\u548cp4\u5c31\u884c\u4e86\u3002<\/li>\n<li>\u5f53\u6211\u4eec\u60f3\u53d6\u51fa\u6574\u6570IP\u65f6&#xff0c;\u76f4\u63a5\u8bfb\u53d6\u8054\u5408\u4f53\u7684\u7b2c\u4e00\u4e2a\u6210\u5458\u5c31\u884c\u4e86\u3002<\/li>\n<li>\u5f53\u6211\u4eec\u60f3\u53d6\u51fa\u5b57\u7b26\u4e32IP\u65f6&#xff0c;\u4f9d\u6b21\u83b7\u53d6\u8054\u5408\u4f53\u4e2d\u7b2c\u4e8c\u4e2a\u6210\u5458\u5f53\u4e2d\u7684p1\u3001p2\u3001p3\u548cp4&#xff0c;\u7136\u540e\u5c06\u6bcf\u4e00\u90e8\u5206\u8f6c\u6362\u6210\u5b57\u7b26\u4e32\u540e\u62fc\u63a5\u5230\u4e00\u8d77\u5c31\u884c\u4e86\u3002<\/li>\n<\/ul>\n<p>\u6ce8\u610f&#xff1a; \u5728\u64cd\u4f5c\u7cfb\u7edf\u5185\u90e8\u5b9e\u9645\u7528\u7684\u5c31\u662f\u4f4d\u6bb5\u548c\u679a\u4e3e&#xff0c;\u6765\u5b8c\u6210\u5b57\u7b26\u4e32IP\u548c\u6574\u6570IP\u4e4b\u95f4\u7684\u76f8\u4e92\u8f6c\u6362\u7684<\/p>\n<p>&#x1f30e;inet_addr\u51fd\u6570<\/p>\n<p>\u5b9e\u9645\u5728\u8fdb\u884c\u5b57\u7b26\u4e32IP\u548c\u6574\u6570IP\u7684\u8f6c\u6362\u65f6&#xff0c;\u6211\u4eec\u4e0d\u9700\u8981\u81ea\u5df1\u7f16\u5199\u8f6c\u6362\u903b\u8f91&#xff0c;\u7cfb\u7edf\u5df2\u7ecf\u4e3a\u6211\u4eec\u63d0\u4f9b\u4e86\u76f8\u5e94\u7684\u8f6c\u6362\u51fd\u6570&#xff0c;\u6211\u4eec\u76f4\u63a5\u8c03\u7528\u5373\u53ef\u3002<\/p>\n<p>\u5c06\u5b57\u7b26\u4e32IP\u8f6c\u6362\u6210\u6574\u6570IP\u7684\u51fd\u6570\u53eb\u505ainet_addr&#xff0c;\u8be5\u51fd\u6570\u7684\u51fd\u6570\u539f\u578b\u5982\u4e0b&#xff1a;<\/p>\n<p>in_addr_t <span class=\"token function\">inet_addr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>cp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8be5\u51fd\u6570\u4f7f\u7528\u8d77\u6765\u975e\u5e38\u7b80\u5355&#xff0c;\u6211\u4eec\u53ea\u9700\u4f20\u5165\u5f85\u8f6c\u6362\u7684\u5b57\u7b26\u4e32IP&#xff0c;\u8be5\u51fd\u6570\u8fd4\u56de\u7684\u5c31\u662f\u8f6c\u6362\u540e\u7684\u6574\u6570IP\u3002\u9664\u6b64\u4e4b\u5916&#xff0c;inet_aton\u51fd\u6570\u4e5f\u53ef\u4ee5\u5c06\u5b57\u7b26\u4e32IP\u8f6c\u6362\u6210\u6574\u6570IP&#xff0c;\u4e0d\u8fc7\u8be5\u51fd\u6570\u4f7f\u7528\u8d77\u6765\u6ca1\u6709inet_addr\u7b80\u5355\u3002<\/p>\n<p>&#x1f30e;inet_ntoa\u51fd\u6570<\/p>\n<p>\u5c06\u6574\u6570IP\u8f6c\u6362\u6210\u5b57\u7b26\u4e32IP\u7684\u51fd\u6570\u53eb\u505ainet_ntoa&#xff0c;\u8be5\u51fd\u6570\u7684\u51fd\u6570\u539f\u578b\u5982\u4e0b&#xff1a;<\/p>\n<p><span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span><span class=\"token function\">inet_ntoa<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">in_addr<\/span> in<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f&#xff0c;\u4f20\u5165inet_ntoa\u51fd\u6570\u7684\u53c2\u6570\u7c7b\u578b\u662fin_addr&#xff0c;\u56e0\u6b64\u6211\u4eec\u5728\u4f20\u53c2\u65f6\u4e0d\u9700\u8981\u9009\u4e2din_addr\u7ed3\u6784\u5f53\u4e2d\u768432\u4f4d\u7684\u6210\u5458\u4f20\u5165&#xff0c;\u76f4\u63a5\u4f20\u5165in_addr\u7ed3\u6784\u4f53\u5373\u53ef\u3002<\/p>\n<h3>\u8fd0\u884c\u670d\u52a1\u5668<\/h3>\n<p>UDP\u670d\u52a1\u5668\u7684\u521d\u59cb\u5316\u5c31\u53ea\u9700\u8981\u521b\u5efa\u5957\u63a5\u5b57\u548c\u7ed1\u5b9a\u5c31\u884c\u4e86&#xff0c;\u5f53\u670d\u52a1\u5668\u521d\u59cb\u5316\u5b8c\u6bd5\u540e\u6211\u4eec\u5c31\u53ef\u4ee5\u542f\u52a8\u670d\u52a1\u5668\u4e86\u3002<\/p>\n<p>\u670d\u52a1\u5668\u5b9e\u9645\u4e0a\u5c31\u662f\u5728\u5468\u800c\u590d\u59cb\u7684\u4e3a\u6211\u4eec\u63d0\u4f9b\u67d0\u79cd\u670d\u52a1&#xff0c;\u670d\u52a1\u5668\u4e4b\u6240\u4ee5\u79f0\u4e3a\u670d\u52a1\u5668&#xff0c;\u662f\u56e0\u4e3a\u670d\u52a1\u5668\u8fd0\u884c\u8d77\u6765\u540e\u5c31\u6c38\u8fdc\u4e0d\u4f1a\u9000\u51fa&#xff0c;\u56e0\u6b64\u670d\u52a1\u5668\u5b9e\u9645\u6267\u884c\u7684\u662f\u4e00\u4e2a\u6b7b\u5faa\u73af\u4ee3\u7801\u3002\u7531\u4e8eUDP\u670d\u52a1\u5668\u662f\u4e0d\u9762\u5411\u8fde\u63a5\u7684&#xff0c;\u56e0\u6b64\u53ea\u8981UDP\u670d\u52a1\u5668\u542f\u52a8\u540e&#xff0c;\u5c31\u53ef\u4ee5\u76f4\u63a5\u8bfb\u53d6\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u6570\u636e\u3002<\/p>\n<p>&#x1f30e;recvfrom\u51fd\u6570<\/p>\n<p>UDP\u670d\u52a1\u5668\u8bfb\u53d6\u6570\u636e\u7684\u51fd\u6570\u53eb\u505arecvfrom&#xff0c;\u8be5\u51fd\u6570\u7684\u51fd\u6570\u539f\u578b\u5982\u4e0b&#xff1a;<\/p>\n<p>ssize_t <span class=\"token function\">recvfrom<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> sockfd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>buf<span class=\"token punctuation\">,<\/span> size_t len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> flags<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token operator\">*<\/span>src_addr<span class=\"token punctuation\">,<\/span> socklen_t <span class=\"token operator\">*<\/span>addrlen<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53c2\u6570\u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>sockfd&#xff1a;\u5bf9\u5e94\u64cd\u4f5c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002\u8868\u793a\u4ece\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u7d22\u5f15\u7684\u6587\u4ef6\u5f53\u4e2d\u8bfb\u53d6\u6570\u636e\u3002<\/li>\n<li>buf&#xff1a;\u8bfb\u53d6\u6570\u636e\u7684\u5b58\u653e\u4f4d\u7f6e\u3002<\/li>\n<li>len&#xff1a;\u671f\u671b\u8bfb\u53d6\u6570\u636e\u7684\u5b57\u8282\u6570\u3002<\/li>\n<li>flags&#xff1a;\u8bfb\u53d6\u7684\u65b9\u5f0f\u3002\u4e00\u822c\u8bbe\u7f6e\u4e3a0&#xff0c;\u8868\u793a\u963b\u585e\u8bfb\u53d6\u3002<\/li>\n<li>src_addr&#xff1a;\u5bf9\u7aef\u7f51\u7edc\u76f8\u5173\u7684\u5c5e\u6027\u4fe1\u606f&#xff0c;\u5305\u62ec\u534f\u8bae\u5bb6\u65cf\u3001IP\u5730\u5740\u3001\u7aef\u53e3\u53f7\u7b49\u3002<\/li>\n<li>addrlen&#xff1a;\u8c03\u7528\u65f6\u4f20\u5165\u671f\u671b\u8bfb\u53d6\u7684src_addr\u7ed3\u6784\u4f53\u7684\u957f\u5ea6&#xff0c;\u8fd4\u56de\u65f6\u4ee3\u8868\u5b9e\u9645\u8bfb\u53d6\u5230\u7684src_addr\u7ed3\u6784\u4f53\u7684\u957f\u5ea6&#xff0c;\u8fd9\u662f\u4e00\u4e2a\u8f93\u5165\u8f93\u51fa\u578b\u53c2\u6570\u3002<\/li>\n<\/ul>\n<p>\u8fd4\u56de\u503c\u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>\u8bfb\u53d6\u6210\u529f\u8fd4\u56de\u5b9e\u9645\u8bfb\u53d6\u5230\u7684\u5b57\u8282\u6570&#xff0c;\u8bfb\u53d6\u5931\u8d25\u8fd4\u56de-1&#xff0c;\u540c\u65f6\u9519\u8bef\u7801\u4f1a\u88ab\u8bbe\u7f6e\u3002<\/li>\n<\/ul>\n<p>\u6ce8\u610f&#xff1a;<\/p>\n<ul>\n<li>\u7531\u4e8eUDP\u662f\u4e0d\u9762\u5411\u8fde\u63a5\u7684&#xff0c;\u56e0\u6b64\u6211\u4eec\u9664\u4e86\u83b7\u53d6\u5230\u6570\u636e\u4ee5\u5916\u8fd8\u9700\u8981\u83b7\u53d6\u5230\u5bf9\u7aef\u7f51\u7edc\u76f8\u5173\u7684\u5c5e\u6027\u4fe1\u606f&#xff0c;\u5305\u62ecIP\u5730\u5740\u548c\u7aef\u53e3\u53f7\u7b49\u3002<\/li>\n<li>\u5728\u8c03\u7528recvfrom\u8bfb\u53d6\u6570\u636e\u65f6&#xff0c;\u5fc5\u987b\u5c06addrlen\u8bbe\u7f6e\u4e3a\u4f60\u8981\u8bfb\u53d6\u7684\u7ed3\u6784\u4f53\u5bf9\u5e94\u7684\u5927\u5c0f\u3002<\/li>\n<li>\u7531\u4e8erecvfrom\u51fd\u6570\u63d0\u4f9b\u7684\u53c2\u6570\u4e5f\u662fstruct sockaddr\u7c7b\u578b\u7684&#xff0c;\u56e0\u6b64\u6211\u4eec\u5728\u4f20\u5165\u7ed3\u6784\u4f53\u5730\u5740\u65f6\u9700\u8981\u5c06struct sockaddr_in\u7c7b\u578b\u8fdb\u884c\u5f3a\u8f6c\u3002<\/li>\n<\/ul>\n<p>&#x1f30e;\u542f\u52a8\u670d\u52a1\u5668\u51fd\u6570<\/p>\n<p>\u73b0\u5728\u670d\u52a1\u7aef\u901a\u8fc7recvfrom\u51fd\u6570\u8bfb\u53d6\u5ba2\u6237\u7aef\u6570\u636e&#xff0c;\u6211\u4eec\u53ef\u4ee5\u5148\u5c06\u8bfb\u53d6\u5230\u7684\u6570\u636e\u5f53\u4f5c\u5b57\u7b26\u4e32\u770b\u5f85&#xff0c;\u5c06\u8bfb\u53d6\u5230\u7684\u6570\u636e\u7684\u6700\u540e\u4e00\u4e2a\u4f4d\u7f6e\u8bbe\u7f6e\u4e3a\u2019\\\\0\u2019&#xff0c;\u6b64\u65f6\u6211\u4eec\u5c31\u53ef\u4ee5\u5c06\u8bfb\u53d6\u5230\u7684\u6570\u636e\u8fdb\u884c\u8f93\u51fa&#xff0c;\u540c\u65f6\u6211\u4eec\u4e5f\u53ef\u4ee5\u5c06\u83b7\u53d6\u5230\u7684\u5ba2\u6237\u7aef\u7684IP\u5730\u5740\u548c\u7aef\u53e3\u53f7\u4e5f\u4e00\u5e76\u8fdb\u884c\u8f93\u51fa\u3002<\/p>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f&#xff0c;\u6211\u4eec\u83b7\u53d6\u5230\u7684\u5ba2\u6237\u7aef\u7684\u7aef\u53e3\u53f7\u6b64\u65f6\u662f\u7f51\u7edc\u5e8f\u5217&#xff0c;\u6211\u4eec\u9700\u8981\u8c03\u7528ntohs\u51fd\u6570\u5c06\u5176\u8f6c\u4e3a\u4e3b\u673a\u5e8f\u5217\u518d\u8fdb\u884c\u6253\u5370\u8f93\u51fa\u3002\u540c\u65f6&#xff0c;\u6211\u4eec\u83b7\u53d6\u5230\u7684\u5ba2\u6237\u7aef\u7684IP\u5730\u5740\u662f\u6574\u6570IP&#xff0c;\u6211\u4eec\u9700\u8981\u901a\u8fc7\u8c03\u7528inet_ntoa\u51fd\u6570\u5c06\u5176\u8f6c\u4e3a\u5b57\u7b26\u4e32IP\u518d\u8fdb\u884c\u6253\u5370\u8f93\u51fa\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/socket.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/types.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdint.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;memory&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;cstring&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;netinet\/in.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;arpa\/inet.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">int<\/span> BUFFERSIZE <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">128<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UdpServer<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">UdpServer<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span>string ip<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">uint16_t<\/span> port<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token operator\">:<\/span><span class=\"token function\">_sockfd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">,<\/span><span class=\"token function\">_port<\/span><span class=\"token punctuation\">(<\/span>port<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">,<\/span><span class=\"token function\">_ip<\/span><span class=\"token punctuation\">(<\/span>ip<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token comment\">\/\/\u670d\u52a1\u5668\u542f\u52a8<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">Start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">char<\/span> buffer<span class=\"token punctuation\">[<\/span>BUFFERSIZE<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> peer<span class=\"token punctuation\">;<\/span><br \/>\n            socklen_t len <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>peer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            ssize_t size <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">recvfrom<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span>buffer<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buffer<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>peer<span class=\"token punctuation\">,<\/span><span class=\"token operator\">&amp;<\/span>len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>size <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><br \/>\n                std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;recvfrom error!!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            buffer<span class=\"token punctuation\">[<\/span>size<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">ntohs<\/span><span class=\"token punctuation\">(<\/span>peer<span class=\"token punctuation\">.<\/span>sin_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>string ip <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">inet_ntoa<\/span><span class=\"token punctuation\">(<\/span>peer<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/\u6d88\u606f\u6253\u5370<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> ip <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;:&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> port <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;# &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> buffer <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token comment\">\/\/\u670d\u52a1\u5668\u521d\u59cb\u5316<\/span><br \/>\n    <span class=\"token keyword\">bool<\/span> <span class=\"token function\">InitServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/AF_INET,\u8868\u660e\u9700\u8981\u7f51\u7edc\u901a\u4fe1<\/span><br \/>\n        <span class=\"token comment\">\/\/SOCK_DGRAM,\u9762\u5411\u6570\u636e\u62a5<\/span><br \/>\n        <span class=\"token comment\">\/\/0&#xff0c;\u9ed8\u8ba4&#xff0c;\u6839\u636e\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a\u9762\u5411\u6570\u636e\u62a5&#xff0c;\u81ea\u52a8\u8bc6\u522b\u4e3aUDP\u534f\u8bae<\/span><br \/>\n        _sockfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span>SOCK_DGRAM<span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;socket create error!!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;socket create success,sockfd : &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> _sockfd <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/\u586b\u5145\u7f51\u7edc\u901a\u4fe1\u76f8\u5173\u4fe1\u606f<\/span><br \/>\n        <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> local<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>local<span class=\"token punctuation\">,<\/span><span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        local<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n        local<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span>_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        local<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">inet_addr<\/span><span class=\"token punctuation\">(<\/span>_ip<span class=\"token punctuation\">.<\/span><span class=\"token function\">c_str<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/\u7ed1\u5b9a<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>local<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;bind error!!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;bind success &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token operator\">~<\/span><span class=\"token function\">UdpServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> _sockfd<span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> _port<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/\u7aef\u53e3\u53f7<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string _ip<span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/IP\u5730\u5740<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a; \u5982\u679c\u8c03\u7528recvfrom\u51fd\u6570\u8bfb\u53d6\u6570\u636e\u5931\u8d25&#xff0c;\u6211\u4eec\u53ef\u4ee5\u6253\u5370\u4e00\u6761\u63d0\u793a\u4fe1\u606f&#xff0c;\u4f46\u662f\u4e0d\u8981\u8ba9\u670d\u52a1\u5668\u9000\u51fa&#xff0c;\u670d\u52a1\u5668\u4e0d\u80fd\u56e0\u4e3a\u8bfb\u53d6\u67d0\u4e00\u4e2a\u5ba2\u6237\u7aef\u7684\u6570\u636e\u5931\u8d25\u5c31\u9000\u51fa\u3002<\/p>\n<p>&#x1f30e;\u5f15\u5165\u547d\u4ee4\u884c\u53c2\u6570<\/p>\n<p>\u9274\u4e8e\u6784\u9020\u670d\u52a1\u5668\u65f6\u9700\u8981\u4f20\u5165IP\u5730\u5740\u548c\u7aef\u53e3\u53f7&#xff0c;\u6211\u4eec\u8fd9\u91cc\u53ef\u4ee5\u5f15\u5165\u547d\u4ee4\u884c\u53c2\u6570\u3002\u6b64\u65f6\u5f53\u6211\u4eec\u8fd0\u884c\u670d\u52a1\u5668\u65f6\u5728\u540e\u9762\u8ddf\u4e0a\u5bf9\u5e94\u7684IP\u5730\u5740\u548c\u7aef\u53e3\u53f7\u5373\u53ef\u3002<\/p>\n<p>\u7531\u4e8e\u4e91\u670d\u52a1\u5668\u7684\u539f\u56e0&#xff0c;\u540e\u9762\u5b9e\u9645\u4e0d\u9700\u8981\u4f20\u5165IP\u5730\u5740&#xff0c;\u56e0\u6b64\u5728\u8fd0\u884c\u670d\u52a1\u5668\u7684\u65f6\u5019\u6211\u4eec\u53ea\u9700\u8981\u4f20\u5165\u7aef\u53e3\u53f7\u5373\u53ef&#xff0c;\u76ee\u524d\u6211\u4eec\u5c31\u624b\u52a8\u5c06IP\u5730\u5740\u8bbe\u7f6e\u4e3a127.0.0.1\u3002IP\u5730\u5740\u4e3a127.0.0.1\u5b9e\u9645\u4e0a\u7b49\u4ef7\u4e8elocalhost\u8868\u793a\u672c\u5730\u4e3b\u673a&#xff0c;\u6211\u4eec\u5c06\u5b83\u79f0\u4e4b\u4e3a\u672c\u5730\u73af\u56de&#xff0c;\u76f8\u5f53\u4e8e\u6211\u4eec\u4e00\u4f1a\u5148\u5728\u672c\u5730\u6d4b\u8bd5\u4e00\u4e0b\u80fd\u5426\u6b63\u5e38\u901a\u4fe1&#xff0c;\u7136\u540e\u518d\u8fdb\u884c\u7f51\u7edc\u901a\u4fe1\u7684\u6d4b\u8bd5\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> argc<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> argv<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>argc <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Usage: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> argv<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034; port&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string ip <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;127.0.0.1&#034;<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u672c\u5730\u73af\u56de<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">atoi<\/span><span class=\"token punctuation\">(<\/span>argv<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    UdpServer<span class=\"token operator\">*<\/span> srv <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token function\">UdpServer<\/span><span class=\"token punctuation\">(<\/span>ip<span class=\"token punctuation\">,<\/span>port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    srv<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">InitServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    srv<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">Start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6b64\u65f6\u5e26\u4e0a\u7aef\u53e3\u53f7\u8fd0\u884c\u7a0b\u5e8f\u5c31\u53ef\u4ee5\u770b\u5230\u5957\u63a5\u5b57\u521b\u5efa\u6210\u529f\u3001\u7ed1\u5b9a\u6210\u529f&#xff0c;\u73b0\u5728\u670d\u52a1\u5668\u5c31\u5728\u7b49\u5f85\u5ba2\u6237\u7aef\u5411\u5b83\u53d1\u9001\u6570\u636e\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603082132-683eb08c415c8.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u867d\u7136\u73b0\u5728\u5ba2\u6237\u7aef\u4ee3\u7801\u8fd8\u6ca1\u6709\u7f16\u5199&#xff0c;\u4f46\u662f\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7netstat\u547d\u4ee4\u6765\u67e5\u770b\u5f53\u524d\u7f51\u7edc\u7684\u72b6\u6001&#xff0c;\u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u9009\u62e9\u643a\u5e26nlup\u9009\u9879\u3002<\/p>\n<p>netstat\u5e38\u7528\u9009\u9879\u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>-n&#xff1a;\u76f4\u63a5\u4f7f\u7528IP\u5730\u5740&#xff0c;\u800c\u4e0d\u901a\u8fc7\u57df\u540d\u670d\u52a1\u5668\u3002<\/li>\n<li>-l&#xff1a;\u663e\u793a\u76d1\u63a7\u4e2d\u7684\u670d\u52a1\u5668\u7684Socket\u3002<\/li>\n<li>-t&#xff1a;\u663e\u793aTCP\u4f20\u8f93\u534f\u8bae\u7684\u8fde\u7ebf\u72b6\u51b5\u3002<\/li>\n<li>-u&#xff1a;\u663e\u793aUDP\u4f20\u8f93\u534f\u8bae\u7684\u8fde\u7ebf\u72b6\u51b5\u3002<\/li>\n<li>-p&#xff1a;\u663e\u793a\u6b63\u5728\u4f7f\u7528Socket\u7684\u7a0b\u5e8f\u8bc6\u522b\u7801\u548c\u7a0b\u5e8f\u540d\u79f0\u3002<\/li>\n<\/ul>\n<p>\u6b64\u65f6\u4f60\u5c31\u80fd\u67e5\u770b\u5230\u5bf9\u5e94\u7f51\u7edc\u76f8\u5173\u7684\u4fe1\u606f&#xff0c;\u5728\u8fd9\u4e9b\u4fe1\u606f\u4e2d\u7a0b\u5e8f\u540d\u79f0\u4e3a.\/server\u7684\u90a3\u4e00\u884c\u663e\u793a\u7684\u5c31\u662f\u6211\u4eec\u8fd0\u884c\u7684UDP\u670d\u52a1\u5668\u7684\u7f51\u7edc\u4fe1\u606f\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603082132-683eb08c6c15c.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>\u5ba2\u6237\u7aef\u521b\u5efa\u5957\u63a5\u5b57<\/h3>\n<p>\u540c\u6837\u7684&#xff0c;\u6211\u4eec\u628a\u5ba2\u6237\u7aef\u4e5f\u5c01\u88c5\u6210\u4e00\u4e2a\u7c7b&#xff0c;\u5f53\u6211\u4eec\u5b9a\u4e49\u51fa\u4e00\u4e2a\u5ba2\u6237\u7aef\u5bf9\u8c61\u540e\u4e5f\u662f\u9700\u8981\u5bf9\u5176\u8fdb\u884c\u521d\u59cb\u5316&#xff0c;\u800c\u5ba2\u6237\u7aef\u5728\u521d\u59cb\u5316\u65f6\u4e5f\u9700\u8981\u521b\u5efa\u5957\u63a5\u5b57&#xff0c;\u4e4b\u540e\u5ba2\u6237\u7aef\u53d1\u9001\u6570\u636e\u6216\u63a5\u6536\u6570\u636e\u4e5f\u5c31\u662f\u5bf9\u8fd9\u4e2a\u5957\u63a5\u5b57\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<p>\u5ba2\u6237\u7aef\u521b\u5efa\u5957\u63a5\u5b57\u65f6\u9009\u62e9\u7684\u534f\u8bae\u5bb6\u65cf\u4e5f\u662fAF_INET&#xff0c;\u9700\u8981\u7684\u670d\u52a1\u7c7b\u578b\u4e5f\u662fSOCK_DGRAM&#xff0c;\u5f53\u5ba2\u6237\u7aef\u88ab\u6790\u6784\u65f6\u4e5f\u53ef\u4ee5\u9009\u62e9\u5173\u95ed\u5bf9\u5e94\u7684\u5957\u63a5\u5b57\u3002\u4e0e\u670d\u52a1\u7aef\u4e0d\u540c\u7684\u662f&#xff0c;\u5ba2\u6237\u7aef\u5728\u521d\u59cb\u5316\u65f6\u53ea\u9700\u8981\u521b\u5efa\u5957\u63a5\u5b57\u5c31\u884c\u4e86&#xff0c;\u800c\u4e0d\u9700\u8981\u8fdb\u884c\u7ed1\u5b9a\u64cd\u4f5c\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/socket.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/types.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdint.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;memory&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;cstring&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;netinet\/in.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;arpa\/inet.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UdpClient<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">bool<\/span> <span class=\"token function\">InitClient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/\u521b\u5efa\u5957\u63a5\u5b57<\/span><br \/>\n        _sockfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span>SOCK_DGRAM<span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;create sockfd error!!&#034;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token operator\">~<\/span><span class=\"token function\">UdpClient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> _sockfd<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>\u5ba2\u6237\u7aef\u7684\u7ed1\u5b9a\u95ee\u9898<\/h3>\n<p>\u9996\u5148&#xff0c;\u7531\u4e8e\u662f\u7f51\u7edc\u901a\u4fe1&#xff0c;\u901a\u4fe1\u53cc\u65b9\u90fd\u9700\u8981\u627e\u5230\u5bf9\u65b9&#xff0c;\u56e0\u6b64\u670d\u52a1\u7aef\u548c\u5ba2\u6237\u7aef\u90fd\u9700\u8981\u6709\u5404\u81ea\u7684IP\u5730\u5740\u548c\u7aef\u53e3\u53f7&#xff0c;\u53ea\u4e0d\u8fc7\u670d\u52a1\u7aef\u9700\u8981\u8fdb\u884c\u7aef\u53e3\u53f7\u7684\u7ed1\u5b9a&#xff0c;\u800c\u5ba2\u6237\u7aef\u4e0d\u9700\u8981\u3002<\/p>\n<p>\u56e0\u4e3a\u670d\u52a1\u5668\u5c31\u662f\u4e3a\u4e86\u7ed9\u522b\u4eba\u63d0\u4f9b\u670d\u52a1\u7684&#xff0c;\u56e0\u6b64\u670d\u52a1\u5668\u5fc5\u987b\u8981\u8ba9\u522b\u4eba\u77e5\u9053\u81ea\u5df1\u7684IP\u5730\u5740\u548c\u7aef\u53e3\u53f7&#xff0c;IP\u5730\u5740\u4e00\u822c\u5bf9\u5e94\u7684\u5c31\u662f\u57df\u540d&#xff0c;\u800c\u7aef\u53e3\u53f7\u4e00\u822c\u6ca1\u6709\u663e\u793a\u6307\u660e\u8fc7&#xff0c;\u56e0\u6b64\u670d\u52a1\u7aef\u7684\u7aef\u53e3\u53f7\u4e00\u5b9a\u8981\u662f\u4e00\u4e2a\u4f17\u6240\u5468\u77e5\u7684\u7aef\u53e3\u53f7&#xff0c;\u5e76\u4e14\u9009\u5b9a\u540e\u4e0d\u80fd\u8f7b\u6613\u6539\u53d8&#xff0c;\u5426\u5219\u5ba2\u6237\u7aef\u662f\u65e0\u6cd5\u77e5\u9053\u670d\u52a1\u7aef\u7684\u7aef\u53e3\u53f7\u7684&#xff0c;\u8fd9\u5c31\u662f\u670d\u52a1\u7aef\u8981\u8fdb\u884c\u7ed1\u5b9a\u7684\u539f\u56e0&#xff0c;\u53ea\u6709\u7ed1\u5b9a\u4e4b\u540e\u8fd9\u4e2a\u7aef\u53e3\u53f7\u624d\u771f\u6b63\u5c5e\u4e8e\u81ea\u5df1&#xff0c;\u56e0\u4e3a\u4e00\u4e2a\u7aef\u53e3\u53ea\u80fd\u88ab\u4e00\u4e2a\u8fdb\u7a0b\u6240\u7ed1\u5b9a&#xff0c;\u670d\u52a1\u5668\u7ed1\u5b9a\u4e00\u4e2a\u7aef\u53e3\u5c31\u662f\u4e3a\u4e86\u72ec\u5360\u8fd9\u4e2a\u7aef\u53e3\u3002<\/p>\n<p>\u800c\u5ba2\u6237\u7aef\u5728\u901a\u4fe1\u65f6\u867d\u7136\u4e5f\u9700\u8981\u7aef\u53e3\u53f7&#xff0c;\u4f46\u5ba2\u6237\u7aef\u4e00\u822c\u662f\u4e0d\u8fdb\u884c\u7ed1\u5b9a\u7684&#xff0c;\u5ba2\u6237\u7aef\u8bbf\u95ee\u670d\u52a1\u7aef\u7684\u65f6\u5019&#xff0c;\u7aef\u53e3\u53f7\u53ea\u8981\u662f\u552f\u4e00\u7684\u5c31\u884c\u4e86&#xff0c;\u4e0d\u9700\u8981\u548c\u7279\u5b9a\u5ba2\u6237\u7aef\u8fdb\u7a0b\u5f3a\u76f8\u5173\u3002<\/p>\n<p>\u5982\u679c\u5ba2\u6237\u7aef\u7ed1\u5b9a\u4e86\u67d0\u4e2a\u7aef\u53e3\u53f7&#xff0c;\u90a3\u4e48\u4ee5\u540e\u8fd9\u4e2a\u7aef\u53e3\u53f7\u5c31\u53ea\u80fd\u7ed9\u8fd9\u4e00\u4e2a\u5ba2\u6237\u7aef\u4f7f\u7528&#xff0c;\u5c31\u662f\u8fd9\u4e2a\u5ba2\u6237\u7aef\u6ca1\u6709\u542f\u52a8&#xff0c;\u8fd9\u4e2a\u7aef\u53e3\u53f7\u4e5f\u65e0\u6cd5\u5206\u914d\u7ed9\u522b\u4eba&#xff0c;\u5e76\u4e14\u5982\u679c\u8fd9\u4e2a\u7aef\u53e3\u53f7\u88ab\u522b\u4eba\u4f7f\u7528\u4e86&#xff0c;\u90a3\u4e48\u8fd9\u4e2a\u5ba2\u6237\u7aef\u5c31\u65e0\u6cd5\u542f\u52a8\u4e86\u3002\u6240\u4ee5\u5ba2\u6237\u7aef\u7684\u7aef\u53e3\u53ea\u8981\u4fdd\u8bc1\u552f\u4e00\u6027\u5c31\u884c\u4e86&#xff0c;\u56e0\u6b64\u5ba2\u6237\u7aef\u7aef\u53e3\u53ef\u4ee5\u52a8\u6001\u7684\u8fdb\u884c\u8bbe\u7f6e&#xff0c;\u5e76\u4e14\u5ba2\u6237\u7aef\u7684\u7aef\u53e3\u53f7\u4e0d\u9700\u8981\u6211\u4eec\u6765\u8bbe\u7f6e&#xff0c;\u5f53\u6211\u4eec\u8c03\u7528\u7c7b\u4f3c\u4e8esendto\u8fd9\u6837\u7684\u63a5\u53e3\u65f6&#xff0c;\u64cd\u4f5c\u7cfb\u7edf\u4f1a\u81ea\u52a8\u7ed9\u5f53\u524d\u5ba2\u6237\u7aef\u83b7\u53d6\u4e00\u4e2a\u552f\u4e00\u7684\u7aef\u53e3\u53f7\u3002<\/p>\n<p>\u4e5f\u5c31\u662f\u8bf4&#xff0c;\u5ba2\u6237\u7aef\u6bcf\u6b21\u542f\u52a8\u65f6\u4f7f\u7528\u7684\u7aef\u53e3\u53f7\u53ef\u80fd\u662f\u53d8\u5316\u7684&#xff0c;\u6b64\u65f6\u53ea\u8981\u6211\u4eec\u7684\u7aef\u53e3\u53f7\u6ca1\u6709\u88ab\u8017\u5c3d&#xff0c;\u5ba2\u6237\u7aef\u5c31\u6c38\u8fdc\u53ef\u4ee5\u542f\u52a8\u3002<\/p>\n<h3>\u542f\u52a8\u5ba2\u6237\u7aef<\/h3>\n<p>&#x1f30e;\u589e\u52a0\u670d\u52a1\u7aefIP\u5730\u5740\u548c\u7aef\u53e3\u53f7<\/p>\n<p>\u4f5c\u4e3a\u4e00\u4e2a\u5ba2\u6237\u7aef&#xff0c;\u5b83\u5fc5\u987b\u77e5\u9053\u5b83\u8981\u8bbf\u95ee\u7684\u670d\u52a1\u7aef\u7684IP\u5730\u5740\u548c\u7aef\u53e3\u53f7&#xff0c;\u56e0\u6b64\u5728\u5ba2\u6237\u7aef\u7c7b\u5f53\u4e2d\u9700\u8981\u5f15\u5165\u670d\u52a1\u7aef\u7684IP\u5730\u5740\u548c\u7aef\u53e3\u53f7&#xff0c;\u6b64\u65f6\u6211\u4eec\u5c31\u53ef\u4ee5\u6839\u636e\u4f20\u5165\u7684\u670d\u52a1\u7aef\u7684IP\u5730\u5740\u548c\u7aef\u53e3\u53f7\u5bf9\u5bf9\u5e94\u7684\u6210\u5458\u8fdb\u884c\u521d\u59cb\u5316\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/socket.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/types.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdint.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;memory&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;cstring&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;netinet\/in.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;arpa\/inet.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UdpClient<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">UdpClient<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span>string ip<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">uint16_t<\/span> port<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token operator\">:<\/span><span class=\"token function\">_sockfd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">,<\/span><span class=\"token function\">_server_port<\/span><span class=\"token punctuation\">(<\/span>port<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">,<\/span><span class=\"token function\">_server_ip<\/span><span class=\"token punctuation\">(<\/span>ip<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">bool<\/span> <span class=\"token function\">InitClient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/\u521b\u5efa\u5957\u63a5\u5b57<\/span><br \/>\n        _sockfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span>SOCK_DGRAM<span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;create sockfd error!!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token operator\">~<\/span><span class=\"token function\">UdpClient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> _sockfd<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> _server_port<span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/\u670d\u52a1\u5668\u7aef\u53e3\u53f7<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string _server_ip<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/\u670d\u52a1\u5668ip<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5f53\u5ba2\u6237\u7aef\u521d\u59cb\u5316\u5b8c\u6bd5\u540e\u6211\u4eec\u5c31\u53ef\u4ee5\u5c06\u5ba2\u6237\u7aef\u8fd0\u884c\u8d77\u6765&#xff0c;\u7531\u4e8e\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u7aef\u5728\u529f\u80fd\u4e0a\u662f\u76f8\u4e92\u8865\u5145\u7684&#xff0c;\u65e2\u7136\u670d\u52a1\u5668\u662f\u5728\u8bfb\u53d6\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u6570\u636e&#xff0c;\u90a3\u4e48\u5ba2\u6237\u7aef\u5c31\u5e94\u8be5\u60f3\u670d\u52a1\u7aef\u53d1\u9001\u6570\u636e\u3002<\/p>\n<p>&#x1f30e;sendto\u51fd\u6570<\/p>\n<p>UDP\u5ba2\u6237\u7aef\u53d1\u9001\u6570\u636e\u7684\u51fd\u6570\u53eb\u505asendto&#xff0c;\u8be5\u51fd\u6570\u7684\u51fd\u6570\u539f\u578b\u5982\u4e0b&#xff1a;<\/p>\n<p>ssize_t <span class=\"token function\">sendto<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> sockfd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>buf<span class=\"token punctuation\">,<\/span> size_t len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> flags<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token operator\">*<\/span>dest_addr<span class=\"token punctuation\">,<\/span> socklen_t addrlen<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53c2\u6570\u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>sockfd&#xff1a;\u5bf9\u5e94\u64cd\u4f5c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002\u8868\u793a\u5c06\u6570\u636e\u5199\u5165\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u7d22\u5f15\u7684\u6587\u4ef6\u5f53\u4e2d\u3002<\/li>\n<li>buf&#xff1a;\u5f85\u5199\u5165\u6570\u636e\u7684\u5b58\u653e\u4f4d\u7f6e\u3002<\/li>\n<li>len&#xff1a;\u671f\u671b\u5199\u5165\u6570\u636e\u7684\u5b57\u8282\u6570\u3002<\/li>\n<li>flags&#xff1a;\u5199\u5165\u7684\u65b9\u5f0f\u3002\u4e00\u822c\u8bbe\u7f6e\u4e3a0&#xff0c;\u8868\u793a\u963b\u585e\u5199\u5165\u3002<\/li>\n<li>dest_addr&#xff1a;\u5bf9\u7aef\u7f51\u7edc\u76f8\u5173\u7684\u5c5e\u6027\u4fe1\u606f&#xff0c;\u5305\u62ec\u534f\u8bae\u5bb6\u65cf\u3001IP\u5730\u5740\u3001\u7aef\u53e3\u53f7\u7b49\u3002 addrlen&#xff1a;\u4f20\u5165dest_addr\u7ed3\u6784\u4f53\u7684\u957f\u5ea6\u3002<\/li>\n<\/ul>\n<p>\u8fd4\u56de\u503c\u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>\u5199\u5165\u6210\u529f\u8fd4\u56de\u5b9e\u9645\u5199\u5165\u7684\u5b57\u8282\u6570&#xff0c;\u5199\u5165\u5931\u8d25\u8fd4\u56de-1&#xff0c;\u540c\u65f6\u9519\u8bef\u7801\u4f1a\u88ab\u8bbe\u7f6e\u3002<\/li>\n<\/ul>\n<p>\u6ce8\u610f&#xff1a;<\/p>\n<ul>\n<li>\u7531\u4e8eUDP\u4e0d\u662f\u9762\u5411\u8fde\u63a5\u7684&#xff0c;\u56e0\u6b64\u9664\u4e86\u4f20\u5165\u5f85\u53d1\u9001\u7684\u6570\u636e\u4ee5\u5916\u8fd8\u9700\u8981\u6307\u660e\u5bf9\u7aef\u7f51\u7edc\u76f8\u5173\u7684\u4fe1\u606f&#xff0c;\u5305\u62ecIP\u5730\u5740\u548c\u7aef\u53e3\u53f7\u7b49\u3002<\/li>\n<li>\u7531\u4e8esendto\u51fd\u6570\u63d0\u4f9b\u7684\u53c2\u6570\u4e5f\u662fstruct sockaddr\u7c7b\u578b\u7684&#xff0c;\u56e0\u6b64\u6211\u4eec\u5728\u4f20\u5165\u7ed3\u6784\u4f53\u5730\u5740\u65f6\u9700\u8981\u5c06struct sockaddr_in\u7c7b\u578b\u8fdb\u884c\u5f3a\u8f6c\u3002<\/li>\n<\/ul>\n<p>&#x1f30e;\u542f\u52a8\u5ba2\u6237\u7aef\u51fd\u6570<\/p>\n<p>\u73b0\u5728\u5ba2\u6237\u7aef\u8981\u53d1\u9001\u6570\u636e\u7ed9\u670d\u52a1\u7aef&#xff0c;\u6211\u4eec\u53ef\u4ee5\u8ba9\u5ba2\u6237\u7aef\u83b7\u53d6\u7528\u6237\u8f93\u5165&#xff0c;\u4e0d\u65ad\u5c06\u7528\u6237\u8f93\u5165\u7684\u6570\u636e\u53d1\u9001\u7ed9\u670d\u52a1\u7aef\u3002<\/p>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f&#xff0c;\u5ba2\u6237\u7aef\u4e2d\u5b58\u50a8\u7684\u670d\u52a1\u7aef\u7684\u7aef\u53e3\u53f7\u6b64\u65f6\u662f\u4e3b\u673a\u5e8f\u5217&#xff0c;\u6211\u4eec\u9700\u8981\u8c03\u7528htons\u51fd\u6570\u5c06\u5176\u8f6c\u4e3a\u7f51\u7edc\u5e8f\u5217\u540e\u518d\u8bbe\u7f6e\u8fdbstruct sockaddr_in\u7ed3\u6784\u4f53\u3002\u540c\u65f6&#xff0c;\u5ba2\u6237\u7aef\u4e2d\u5b58\u50a8\u7684\u670d\u52a1\u7aef\u7684IP\u5730\u5740\u662f\u5b57\u7b26\u4e32IP&#xff0c;\u6211\u4eec\u9700\u8981\u901a\u8fc7\u8c03\u7528inet_addr\u51fd\u6570\u5c06\u5176\u8f6c\u4e3a\u6574\u6570IP\u540e\u518d\u8bbe\u7f6e\u8fdbstruct sockaddr_in\u7ed3\u6784\u4f53\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/socket.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/types.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdint.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;memory&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;cstring&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;netinet\/in.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;arpa\/inet.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UdpClient<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">UdpClient<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span>string ip<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">uint16_t<\/span> port<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token operator\">:<\/span><span class=\"token function\">_sockfd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">,<\/span><span class=\"token function\">_server_port<\/span><span class=\"token punctuation\">(<\/span>port<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">,<\/span><span class=\"token function\">_server_ip<\/span><span class=\"token punctuation\">(<\/span>ip<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">Start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>string msg<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/\u76ee\u6807\u670d\u52a1\u5668\u4fe1\u606f<\/span><br \/>\n        <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> peer<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>peer<span class=\"token punctuation\">,<\/span><span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>peer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        peer<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n        peer<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span>_server_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        peer<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">inet_addr<\/span><span class=\"token punctuation\">(<\/span>_server_ip<span class=\"token punctuation\">.<\/span><span class=\"token function\">c_str<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Please Enter# &#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">getline<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span>cin<span class=\"token punctuation\">,<\/span>msg<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">sendto<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span>msg<span class=\"token punctuation\">.<\/span><span class=\"token function\">c_str<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>msg<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>peer<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>peer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">bool<\/span> <span class=\"token function\">InitClient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/\u521b\u5efa\u5957\u63a5\u5b57<\/span><br \/>\n        _sockfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span>SOCK_DGRAM<span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;create sockfd error!!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token operator\">~<\/span><span class=\"token function\">UdpClient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> _sockfd<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> _server_port<span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/\u670d\u52a1\u5668\u7aef\u53e3\u53f7<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string _server_ip<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/\u670d\u52a1\u5668ip<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>&#x1f30e;\u5f15\u5165\u547d\u4ee4\u884c\u53c2\u6570<\/p>\n<p>\u9274\u4e8e\u6784\u9020\u5ba2\u6237\u7aef\u65f6\u9700\u8981\u4f20\u5165\u5bf9\u5e94\u670d\u52a1\u7aef\u7684IP\u5730\u5740\u548c\u7aef\u53e3\u53f7&#xff0c;\u6211\u4eec\u8fd9\u91cc\u4e5f\u53ef\u4ee5\u5f15\u5165\u547d\u4ee4\u884c\u53c2\u6570\u3002\u5f53\u6211\u4eec\u8fd0\u884c\u5ba2\u6237\u7aef\u65f6\u76f4\u63a5\u5728\u540e\u9762\u8ddf\u4e0a\u5bf9\u5e94\u670d\u52a1\u7aef\u7684IP\u5730\u5740\u548c\u7aef\u53e3\u53f7\u5373\u53ef\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> argc<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> argv<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>argc <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Usage: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> argv<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034; server_ip server_port&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string serverip <span class=\"token operator\">&#061;<\/span> argv<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> serverport <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">atoi<\/span><span class=\"token punctuation\">(<\/span>argv<span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    UdpClient<span class=\"token operator\">*<\/span> clt <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span>  <span class=\"token function\">UdpClient<\/span><span class=\"token punctuation\">(<\/span>serverip<span class=\"token punctuation\">,<\/span>serverport<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    clt<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">InitClient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    clt<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">Start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u5b8c\u6574\u4ee3\u7801<\/h3>\n<p>&#x1f30e;server<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/socket.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/types.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdint.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;memory&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;cstring&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;netinet\/in.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;arpa\/inet.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">int<\/span> BUFFERSIZE <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">128<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UdpServer<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">UdpServer<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span>string ip<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">uint16_t<\/span> port<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token operator\">:<\/span><span class=\"token function\">_sockfd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">,<\/span><span class=\"token function\">_port<\/span><span class=\"token punctuation\">(<\/span>port<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">,<\/span><span class=\"token function\">_ip<\/span><span class=\"token punctuation\">(<\/span>ip<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token comment\">\/\/\u670d\u52a1\u5668\u542f\u52a8<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">Start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">char<\/span> buffer<span class=\"token punctuation\">[<\/span>BUFFERSIZE<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> peer<span class=\"token punctuation\">;<\/span><br \/>\n            socklen_t len <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>peer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            ssize_t size <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">recvfrom<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span>buffer<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buffer<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>peer<span class=\"token punctuation\">,<\/span><span class=\"token operator\">&amp;<\/span>len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>size <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><br \/>\n                std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;recvfrom error!!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            buffer<span class=\"token punctuation\">[<\/span>size<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">ntohs<\/span><span class=\"token punctuation\">(<\/span>peer<span class=\"token punctuation\">.<\/span>sin_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>string ip <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">inet_ntoa<\/span><span class=\"token punctuation\">(<\/span>peer<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/\u6d88\u606f\u6253\u5370<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> ip <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;:&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> port <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;# &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> buffer <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token comment\">\/\/\u670d\u52a1\u5668\u521d\u59cb\u5316<\/span><br \/>\n    <span class=\"token keyword\">bool<\/span> <span class=\"token function\">InitServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/AF_INET,\u8868\u660e\u9700\u8981\u7f51\u7edc\u901a\u4fe1<\/span><br \/>\n        <span class=\"token comment\">\/\/SOCK_DGRAM,\u9762\u5411\u6570\u636e\u62a5<\/span><br \/>\n        <span class=\"token comment\">\/\/0&#xff0c;\u9ed8\u8ba4&#xff0c;\u6839\u636e\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a\u9762\u5411\u6570\u636e\u62a5&#xff0c;\u81ea\u52a8\u8bc6\u522b\u4e3aUDP\u534f\u8bae<\/span><br \/>\n        _sockfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span>SOCK_DGRAM<span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;socket create error!!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;socket create success,sockfd : &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> _sockfd <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/\u586b\u5145\u7f51\u7edc\u901a\u4fe1\u76f8\u5173\u4fe1\u606f<\/span><br \/>\n        <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> local<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>local<span class=\"token punctuation\">,<\/span><span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        local<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n        local<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span>_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        local<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">inet_addr<\/span><span class=\"token punctuation\">(<\/span>_ip<span class=\"token punctuation\">.<\/span><span class=\"token function\">c_str<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/\u7ed1\u5b9a<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>local<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;bind error!!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;bind success &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token operator\">~<\/span><span class=\"token function\">UdpServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> _sockfd<span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> _port<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/\u7aef\u53e3\u53f7<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string _ip<span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/IP\u5730\u5740<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> argc<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> argv<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>argc <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Usage: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> argv<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034; port&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string ip <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;127.0.0.1&#034;<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u672c\u5730\u73af\u56de<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">atoi<\/span><span class=\"token punctuation\">(<\/span>argv<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    UdpServer<span class=\"token operator\">*<\/span> srv <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token function\">UdpServer<\/span><span class=\"token punctuation\">(<\/span>ip<span class=\"token punctuation\">,<\/span>port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    srv<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">InitServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    srv<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">Start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>&#x1f30e;client<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/socket.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/types.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdint.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;memory&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;cstring&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;netinet\/in.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;arpa\/inet.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UdpClient<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">UdpClient<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span>string ip<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">uint16_t<\/span> port<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token operator\">:<\/span><span class=\"token function\">_sockfd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">,<\/span><span class=\"token function\">_server_port<\/span><span class=\"token punctuation\">(<\/span>port<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">,<\/span><span class=\"token function\">_server_ip<\/span><span class=\"token punctuation\">(<\/span>ip<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">Start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>string msg<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/\u76ee\u6807\u670d\u52a1\u5668\u4fe1\u606f<\/span><br \/>\n        <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> peer<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>peer<span class=\"token punctuation\">,<\/span><span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>peer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        peer<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n        peer<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span>_server_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        peer<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">inet_addr<\/span><span class=\"token punctuation\">(<\/span>_server_ip<span class=\"token punctuation\">.<\/span><span class=\"token function\">c_str<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Please Enter# &#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">getline<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span>cin<span class=\"token punctuation\">,<\/span>msg<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">sendto<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span>msg<span class=\"token punctuation\">.<\/span><span class=\"token function\">c_str<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>msg<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>peer<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>peer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">bool<\/span> <span class=\"token function\">InitClient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/\u521b\u5efa\u5957\u63a5\u5b57<\/span><br \/>\n        _sockfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span>SOCK_DGRAM<span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;create sockfd error!!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token operator\">~<\/span><span class=\"token function\">UdpClient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> _sockfd<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> _server_port<span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/\u670d\u52a1\u5668\u7aef\u53e3\u53f7<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string _server_ip<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/\u670d\u52a1\u5668ip<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> argc<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> argv<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>argc <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Usage: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> argv<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034; server_ip server_port&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string serverip <span class=\"token operator\">&#061;<\/span> argv<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> serverport <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">atoi<\/span><span class=\"token punctuation\">(<\/span>argv<span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    UdpClient<span class=\"token operator\">*<\/span> clt <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span>  <span class=\"token function\">UdpClient<\/span><span class=\"token punctuation\">(<\/span>serverip<span class=\"token punctuation\">,<\/span>serverport<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    clt<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">InitClient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    clt<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">Start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u672c\u5730\u6d4b\u8bd5<\/h3>\n<p>\u73b0\u5728\u670d\u52a1\u7aef\u548c\u5ba2\u6237\u7aef\u7684\u4ee3\u7801\u90fd\u5df2\u7ecf\u7f16\u5199\u5b8c\u6bd5&#xff0c;\u6211\u4eec\u53ef\u4ee5\u5148\u8fdb\u884c\u672c\u5730\u6d4b\u8bd5&#xff0c;\u6b64\u65f6\u670d\u52a1\u5668\u6ca1\u6709\u7ed1\u5b9a\u5916\u7f51&#xff0c;\u7ed1\u5b9a\u7684\u662f\u672c\u5730\u73af\u56de\u3002\u73b0\u5728\u6211\u4eec\u8fd0\u884c\u670d\u52a1\u5668\u65f6\u6307\u660e\u7aef\u53e3\u53f7\u4e3a5678&#xff0c;\u518d\u8fd0\u884c\u5ba2\u6237\u7aef&#xff0c;\u6b64\u65f6\u5ba2\u6237\u7aef\u8981\u8bbf\u95ee\u7684\u670d\u52a1\u5668\u7684IP\u5730\u5740\u5c31\u662f\u672c\u5730\u73af\u56de127.0.0.1&#xff0c;\u670d\u52a1\u7aef\u7684\u7aef\u53e3\u53f7\u5c31\u662f5678\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603082132-683eb08c88298.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u5ba2\u6237\u7aef\u8fd0\u884c\u4e4b\u540e\u63d0\u793a\u6211\u4eec\u8fdb\u884c\u8f93\u5165&#xff0c;\u5f53\u6211\u4eec\u5728\u5ba2\u6237\u7aef\u8f93\u5165\u6570\u636e\u540e&#xff0c;\u5ba2\u6237\u7aef\u5c06\u6570\u636e\u53d1\u9001\u7ed9\u670d\u52a1\u7aef&#xff0c;\u6b64\u65f6\u670d\u52a1\u7aef\u518d\u5c06\u6536\u5230\u7684\u6570\u636e\u6253\u5370\u8f93\u51fa&#xff0c;\u8fd9\u65f6\u6211\u4eec\u5728\u670d\u52a1\u7aef\u7684\u7a97\u53e3\u4e5f\u770b\u5230\u6211\u4eec\u8f93\u5165\u7684\u5185\u5bb9\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603082132-683eb08cb27c4.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u6b64\u65f6\u6211\u4eec\u518d\u7528netstat\u547d\u4ee4\u67e5\u770b\u7f51\u7edc\u4fe1\u606f&#xff0c;\u53ef\u4ee5\u770b\u5230\u670d\u52a1\u7aef\u7684\u7aef\u53e3\u662f8081&#xff0c;\u5ba2\u6237\u7aef\u7684\u7aef\u53e3\u662f55210\u3002\u8fd9\u91cc\u5ba2\u6237\u7aef\u80fd\u88abnetstat\u547d\u4ee4\u67e5\u770b\u5230&#xff0c;\u8bf4\u660e\u5ba2\u6237\u7aef\u4e5f\u5df2\u7ecf\u52a8\u6001\u7ed1\u5b9a\u6210\u529f\u4e86&#xff0c;\u8fd9\u5c31\u662f\u6211\u4eec\u6240\u8c13\u7684\u7f51\u7edc\u901a\u4fe1\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603082132-683eb08cdb82f.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>INADDR_ANY<\/h3>\n<p>\u73b0\u5728\u6211\u4eec\u5df2\u7ecf\u901a\u8fc7\u4e86\u672c\u5730\u6d4b\u8bd5&#xff0c;\u63a5\u4e0b\u6765\u5c31\u9700\u8981\u8fdb\u884c\u7f51\u7edc\u6d4b\u8bd5\u4e86&#xff0c;\u90a3\u662f\u4e0d\u662f\u76f4\u63a5\u8ba9\u670d\u52a1\u7aef\u7ed1\u5b9a\u6211\u7684\u516c\u7f51IP&#xff0c;\u6b64\u65f6\u8fd9\u4e2a\u670d\u52a1\u7aef\u5c31\u80fd\u591f\u88ab\u5916\u7f51\u8bbf\u95ee\u4e86\u5462&#xff1f;<\/p>\n<p>\u7406\u8bba\u4e0a\u786e\u5b9e\u662f\u8fd9\u6837\u7684&#xff0c;\u5c31\u6bd4\u5982\u6211\u7684\u670d\u52a1\u5668\u7684\u516c\u7f51IP\u662f47.94.84.249&#xff0c;\u8fd9\u91cc\u7528ping\u547d\u4ee4\u4e5f\u662f\u80fd\u591fping\u901a\u7684\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603082133-683eb08d03fb4.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u73b0\u5728\u6211\u5c06\u670d\u52a1\u7aef\u8bbe\u7f6e\u7684\u672c\u5730\u73af\u56de\u6539\u4e3a\u6211\u7684\u516c\u7f51IP&#xff0c;\u6b64\u65f6\u5f53\u6211\u4eec\u91cd\u65b0\u7f16\u8bd1\u7a0b\u5e8f\u518d\u6b21\u8fd0\u884c\u670d\u52a1\u7aef\u7684\u65f6\u5019\u4f1a\u53d1\u73b0\u670d\u52a1\u7aef\u7ed1\u5b9a\u5931\u8d25\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603082133-683eb08d25fe5.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u7531\u4e8e\u4e91\u670d\u52a1\u5668\u7684IP\u5730\u5740\u662f\u7531\u5bf9\u5e94\u7684\u4e91\u5382\u5546\u63d0\u4f9b\u7684&#xff0c;\u8fd9\u4e2aIP\u5730\u5740\u5e76\u4e0d\u4e00\u5b9a\u662f\u771f\u6b63\u7684\u516c\u7f51IP&#xff0c;\u8fd9\u4e2aIP\u5730\u5740\u662f\u4e0d\u80fd\u76f4\u63a5\u88ab\u7ed1\u5b9a\u7684&#xff0c;\u5982\u679c\u9700\u8981\u8ba9\u5916\u7f51\u8bbf\u95ee&#xff0c;\u6b64\u65f6\u6211\u4eec\u9700\u8981bind 0\u3002\u7cfb\u7edf\u5f53\u4e2d\u63d0\u4f9b\u7684\u4e00\u4e2aINADDR_ANY&#xff0c;\u8fd9\u662f\u4e00\u4e2a\u5b8f\u503c&#xff0c;\u5b83\u5bf9\u5e94\u7684\u503c\u5c31\u662f0\u3002<\/p>\n<p>\u56e0\u6b64\u5982\u679c\u6211\u4eec\u9700\u8981\u8ba9\u5916\u7f51\u8bbf\u95ee&#xff0c;\u90a3\u4e48\u5728\u4e91\u670d\u52a1\u5668\u4e0a\u8fdb\u884c\u7ed1\u5b9a\u65f6\u5c31\u5e94\u8be5\u7ed1\u5b9aINADDR_ANY&#xff0c;\u6b64\u65f6\u6211\u4eec\u7684\u670d\u52a1\u5668\u624d\u80fd\u591f\u88ab\u5916\u7f51\u8bbf\u95ee\u3002<\/p>\n<p>&#x1f30e;\u7ed1\u5b9aINADDR_ANY\u7684\u597d\u5904<\/p>\n<p>\u5f53\u4e00\u4e2a\u670d\u52a1\u5668\u7684\u5e26\u5bbd\u8db3\u591f\u5927\u65f6&#xff0c;\u4e00\u53f0\u673a\u5668\u63a5\u6536\u6570\u636e\u7684\u80fd\u529b\u5c31\u7ea6\u675f\u4e86\u8fd9\u53f0\u673a\u5668\u7684IO\u6548\u7387&#xff0c;\u56e0\u6b64\u4e00\u53f0\u670d\u52a1\u5668\u5e95\u5c42\u53ef\u80fd\u88c5\u6709\u591a\u5f20\u7f51\u5361&#xff0c;\u6b64\u65f6\u8fd9\u53f0\u670d\u52a1\u5668\u5c31\u53ef\u80fd\u4f1a\u6709\u591a\u4e2aIP\u5730\u5740&#xff0c;\u4f46\u4e00\u53f0\u670d\u52a1\u5668\u4e0a\u7aef\u53e3\u53f7\u4e3a5678\u7684\u670d\u52a1\u53ea\u6709\u4e00\u4e2a\u3002\u8fd9\u53f0\u670d\u52a1\u5668\u5728\u63a5\u6536\u6570\u636e\u65f6&#xff0c;\u8fd9\u91cc\u7684\u591a\u5f20\u7f51\u5361\u5728\u5e95\u5c42\u5b9e\u9645\u90fd\u6536\u5230\u4e86\u6570\u636e&#xff0c;\u5982\u679c\u8fd9\u4e9b\u6570\u636e\u4e5f\u90fd\u60f3\u8bbf\u95ee\u7aef\u53e3\u53f7\u4e3a5678\u7684\u670d\u52a1\u3002\u6b64\u65f6\u5982\u679c\u670d\u52a1\u7aef\u5728\u7ed1\u5b9a\u7684\u65f6\u5019\u662f\u6307\u660e\u7ed1\u5b9a\u7684\u67d0\u4e00\u4e2aIP\u5730\u5740&#xff0c;\u90a3\u4e48\u6b64\u65f6\u670d\u52a1\u7aef\u5728\u63a5\u6536\u6570\u636e\u7684\u65f6\u5019\u5c31\u53ea\u80fd\u4ece\u7ed1\u5b9aIP\u5bf9\u5e94\u7684\u7f51\u5361\u63a5\u6536\u6570\u636e\u3002\u800c\u5982\u679c\u670d\u52a1\u7aef\u7ed1\u5b9a\u7684\u662fINADDR_ANY&#xff0c;\u90a3\u4e48\u53ea\u8981\u662f\u53d1\u9001\u7ed9\u7aef\u53e3\u53f7\u4e3a5678\u7684\u670d\u52a1\u7684\u6570\u636e&#xff0c;\u7cfb\u7edf\u90fd\u4f1a\u53ef\u4ee5\u5c06\u6570\u636e\u81ea\u5e95\u5411\u4e0a\u4ea4\u7ed9\u8be5\u670d\u52a1\u7aef\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603082133-683eb08d40993.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u56e0\u6b64\u670d\u52a1\u7aef\u7ed1\u5b9aINADDR_ANY\u8fd9\u79cd\u65b9\u6848\u4e5f\u662f\u5f3a\u70c8\u63a8\u8350\u7684\u65b9\u6848&#xff0c;\u6240\u6709\u7684\u670d\u52a1\u5668\u5177\u4f53\u5728\u64cd\u4f5c\u7684\u65f6\u5019\u7528\u7684\u4e5f\u5c31\u662f\u8fd9\u79cd\u65b9\u6848\u3002<\/p>\n<p>\u5f53\u7136&#xff0c;\u5982\u679c\u4f60\u65e2\u60f3\u8ba9\u5916\u7f51\u8bbf\u95ee\u4f60\u7684\u670d\u52a1\u5668&#xff0c;\u4f46\u4f60\u53c8\u6307\u5411\u7ed1\u5b9a\u67d0\u4e00\u4e2aIP\u5730\u5740&#xff0c;\u90a3\u4e48\u5c31\u4e0d\u80fd\u7528\u4e91\u670d\u52a1\u5668&#xff0c;\u6b64\u65f6\u53ef\u4ee5\u9009\u62e9\u4f7f\u7528\u865a\u62df\u673a\u6216\u8005\u4f60\u81ea\u5b9a\u4e49\u5b89\u88c5\u7684Linux\u64cd\u4f5c\u7cfb\u7edf&#xff0c;\u90a3\u4e2aIP\u5730\u5740\u5c31\u662f\u652f\u6301\u4f60\u7ed1\u5b9a\u7684&#xff0c;\u800c\u4e91\u670d\u52a1\u5668\u662f\u4e0d\u652f\u6301\u7684\u3002<\/p>\n<p>&#x1f30e;\u66f4\u6539\u4ee3\u7801<\/p>\n<p>\u56e0\u6b64&#xff0c;\u5982\u679c\u60f3\u8981\u8ba9\u5916\u7f51\u8bbf\u95ee\u6211\u4eec\u7684\u670d\u52a1&#xff0c;\u6211\u4eec\u8fd9\u91cc\u5c31\u9700\u8981\u5c06\u670d\u52a1\u5668\u7c7b\u5f53\u4e2dIP\u5730\u5740\u76f8\u5173\u7684\u4ee3\u7801\u53bb\u6389&#xff0c;\u800c\u5728\u586b\u5145\u7f51\u7edc\u76f8\u5173\u4fe1\u606f\u8bbe\u7f6estruct sockaddr_in\u7ed3\u6784\u4f53\u65f6&#xff0c;\u5c06\u8bbe\u7f6e\u7684IP\u5730\u5740\u6539\u4e3aINADDR_ANY\u5c31\u884c\u4e86\u3002\u7531\u4e8eINADDR_ANY\u7684\u503c\u672c\u8d28\u5c31\u662f0&#xff0c;\u4e0d\u5b58\u5728\u5927\u5c0f\u7aef\u7684\u95ee\u9898&#xff0c;\u56e0\u6b64\u5728\u8bbe\u7f6e\u65f6\u53ef\u4ee5\u4e0d\u8fdb\u884c\u7f51\u7edc\u5b57\u8282\u5e8f\u7684\u8f6c\u6362\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/socket.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/types.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdint.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;memory&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;cstring&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;netinet\/in.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;arpa\/inet.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">int<\/span> BUFFERSIZE <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">128<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UdpServer<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">UdpServer<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span>string ip<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">uint16_t<\/span> port<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token operator\">:<\/span><span class=\"token function\">_sockfd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">,<\/span><span class=\"token function\">_port<\/span><span class=\"token punctuation\">(<\/span>port<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">,<\/span><span class=\"token function\">_ip<\/span><span class=\"token punctuation\">(<\/span>ip<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token comment\">\/\/\u670d\u52a1\u5668\u542f\u52a8<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">Start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">char<\/span> buffer<span class=\"token punctuation\">[<\/span>BUFFERSIZE<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> peer<span class=\"token punctuation\">;<\/span><br \/>\n            socklen_t len <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>peer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            ssize_t size <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">recvfrom<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span>buffer<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buffer<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>peer<span class=\"token punctuation\">,<\/span><span class=\"token operator\">&amp;<\/span>len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>size <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><br \/>\n                std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;recvfrom error!!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            buffer<span class=\"token punctuation\">[<\/span>size<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">ntohs<\/span><span class=\"token punctuation\">(<\/span>peer<span class=\"token punctuation\">.<\/span>sin_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>string ip <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">inet_ntoa<\/span><span class=\"token punctuation\">(<\/span>peer<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/\u6d88\u606f\u6253\u5370<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> ip <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;:&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> port <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;# &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> buffer <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token comment\">\/\/\u670d\u52a1\u5668\u521d\u59cb\u5316<\/span><br \/>\n    <span class=\"token keyword\">bool<\/span> <span class=\"token function\">InitServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/AF_INET,\u8868\u660e\u9700\u8981\u7f51\u7edc\u901a\u4fe1<\/span><br \/>\n        <span class=\"token comment\">\/\/SOCK_DGRAM,\u9762\u5411\u6570\u636e\u62a5<\/span><br \/>\n        <span class=\"token comment\">\/\/0&#xff0c;\u9ed8\u8ba4&#xff0c;\u6839\u636e\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a\u9762\u5411\u6570\u636e\u62a5&#xff0c;\u81ea\u52a8\u8bc6\u522b\u4e3aUDP\u534f\u8bae<\/span><br \/>\n        _sockfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span>SOCK_DGRAM<span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;socket create error!!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;socket create success,sockfd : &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> _sockfd <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/\u586b\u5145\u7f51\u7edc\u901a\u4fe1\u76f8\u5173\u4fe1\u606f<\/span><br \/>\n        <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> local<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>local<span class=\"token punctuation\">,<\/span><span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        local<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n        local<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span>_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        local<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> INADDR_ANY<span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u7ed1\u5b9aINADDR_ANY<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/\u7ed1\u5b9a<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>local<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;bind error!!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;bind success &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token operator\">~<\/span><span class=\"token function\">UdpServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> _sockfd<span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> _port<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/\u7aef\u53e3\u53f7<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string _ip<span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/IP\u5730\u5740<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> argc<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> argv<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>argc <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Usage: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> argv<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034; port&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string ip <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;47.94.84.249&#034;<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u672c\u5730\u73af\u56de<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">atoi<\/span><span class=\"token punctuation\">(<\/span>argv<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    UdpServer<span class=\"token operator\">*<\/span> srv <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token function\">UdpServer<\/span><span class=\"token punctuation\">(<\/span>ip<span class=\"token punctuation\">,<\/span>port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    srv<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">InitServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    srv<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">Start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6b64\u65f6\u5f53\u6211\u4eec\u518d\u91cd\u65b0\u7f16\u8bd1\u8fd0\u884c\u670d\u52a1\u5668\u65f6\u5c31\u4e0d\u4f1a\u7ed1\u5b9a\u5931\u8d25\u4e86&#xff0c;\u5e76\u4e14\u6b64\u65f6\u5f53\u6211\u4eec\u518d\u7528netstat\u547d\u4ee4\u67e5\u770b\u65f6\u4f1a\u53d1\u73b0&#xff0c;\u8be5\u670d\u52a1\u5668\u7684\u672c\u5730IP\u5730\u5740\u53d8\u6210\u4e860.0.0.0&#xff0c;\u8fd9\u5c31\u610f\u5473\u7740\u8be5UDP\u670d\u52a1\u5668\u53ef\u4ee5\u5728\u672c\u5730\u8bfb\u53d6\u4efb\u4f55\u4e00\u5f20\u7f51\u5361\u91cc\u9762\u7684\u6570\u636e\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603082133-683eb08dbb4a5.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>\u7b80\u5355\u7684UDP\u56de\u58f0\u670d\u52a1\u5668<\/h3>\n<p>\u7531\u4e8e\u5728\u8fdb\u884c\u7f51\u7edc\u6d4b\u8bd5\u7684\u65f6\u5019&#xff0c;\u5f53\u5ba2\u6237\u7aef\u53d1\u9001\u6570\u636e\u7ed9\u670d\u52a1\u7aef\u65f6&#xff0c;\u670d\u52a1\u7aef\u4f1a\u5c06\u4ece\u5ba2\u6237\u7aef\u6536\u5230\u7684\u6570\u636e\u8fdb\u884c\u6253\u5370&#xff0c;\u56e0\u6b64\u670d\u52a1\u7aef\u662f\u80fd\u591f\u770b\u5230\u73b0\u8c61\u7684\u3002\u4f46\u5ba2\u6237\u7aef\u4e00\u76f4\u5728\u5411\u670d\u52a1\u7aef\u53d1\u9001\u6570\u636e&#xff0c;\u5728\u5ba2\u6237\u7aef\u8fd9\u8fb9\u770b\u4e0d\u51fa\u670d\u52a1\u7aef\u662f\u5426\u6536\u5230\u4e86\u81ea\u5df1\u53d1\u9001\u7684\u6570\u636e\u3002<\/p>\n<p>&#x1f30e;\u670d\u52a1\u7aef\u4ee3\u7801\u6539\u5199<\/p>\n<p>\u9274\u4e8e\u6b64&#xff0c;\u6211\u4eec\u53ef\u4ee5\u5c06\u8be5\u670d\u52a1\u5668\u6539\u6210\u4e00\u4e2a\u7b80\u5355\u7684\u56de\u58f0\u670d\u52a1\u5668\u3002\u5f53\u670d\u52a1\u7aef\u6536\u5230\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u6570\u636e\u540e&#xff0c;\u9664\u4e86\u5728\u670d\u52a1\u7aef\u8fdb\u884c\u6253\u5370\u4ee5\u5916&#xff0c;\u670d\u52a1\u7aef\u53ef\u4ee5\u8c03\u7528sento\u51fd\u6570\u5c06\u6536\u5230\u7684\u6570\u636e\u91cd\u65b0\u53d1\u9001\u7ed9\u5bf9\u5e94\u7684\u5ba2\u6237\u7aef\u3002<\/p>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f&#xff0c;\u670d\u52a1\u7aef\u5728\u8c03\u7528sendto\u51fd\u6570\u65f6\u9700\u8981\u4f20\u5165\u5ba2\u6237\u7aef\u7684\u7f51\u7edc\u5c5e\u6027\u4fe1\u606f&#xff0c;\u4f46\u670d\u52a1\u7aef\u73b0\u5728\u662f\u77e5\u9053\u5ba2\u6237\u7aef\u7684\u7f51\u7edc\u5c5e\u6027\u4fe1\u606f\u7684&#xff0c;\u56e0\u4e3a\u670d\u52a1\u7aef\u5728\u6b64\u4e4b\u524d\u5c31\u5df2\u7ecf\u901a\u8fc7recvfrom\u51fd\u6570\u83b7\u53d6\u5230\u4e86\u5ba2\u6237\u7aef\u7684\u7f51\u7edc\u5c5e\u6027\u4fe1\u606f\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/socket.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/types.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdint.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;memory&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;cstring&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;netinet\/in.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;arpa\/inet.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">int<\/span> BUFFERSIZE <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">128<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UdpServer<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">UdpServer<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span>string ip<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">uint16_t<\/span> port<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token operator\">:<\/span><span class=\"token function\">_sockfd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">,<\/span><span class=\"token function\">_port<\/span><span class=\"token punctuation\">(<\/span>port<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">,<\/span><span class=\"token function\">_ip<\/span><span class=\"token punctuation\">(<\/span>ip<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token comment\">\/\/\u670d\u52a1\u5668\u542f\u52a8<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">Start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">char<\/span> buffer<span class=\"token punctuation\">[<\/span>BUFFERSIZE<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> peer<span class=\"token punctuation\">;<\/span><br \/>\n            socklen_t len <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>peer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            ssize_t size <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">recvfrom<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span>buffer<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buffer<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>peer<span class=\"token punctuation\">,<\/span><span class=\"token operator\">&amp;<\/span>len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>size <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><br \/>\n                std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;recvfrom error!!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            buffer<span class=\"token punctuation\">[<\/span>size<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">ntohs<\/span><span class=\"token punctuation\">(<\/span>peer<span class=\"token punctuation\">.<\/span>sin_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>string ip <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">inet_ntoa<\/span><span class=\"token punctuation\">(<\/span>peer<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/\u6d88\u606f\u6253\u5370<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> ip <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;:&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> port <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;# &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> buffer <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><\/p>\n<p>            std<span class=\"token double-colon punctuation\">::<\/span>string echo_msg <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;server get!-&gt;&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            echo_msg <span class=\"token operator\">&#043;&#061;<\/span> buffer<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">sendto<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span>echo_msg<span class=\"token punctuation\">.<\/span><span class=\"token function\">c_str<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>echo_msg<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>peer<span class=\"token punctuation\">,<\/span>len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token comment\">\/\/\u670d\u52a1\u5668\u521d\u59cb\u5316<\/span><br \/>\n    <span class=\"token keyword\">bool<\/span> <span class=\"token function\">InitServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/AF_INET,\u8868\u660e\u9700\u8981\u7f51\u7edc\u901a\u4fe1<\/span><br \/>\n        <span class=\"token comment\">\/\/SOCK_DGRAM,\u9762\u5411\u6570\u636e\u62a5<\/span><br \/>\n        <span class=\"token comment\">\/\/0&#xff0c;\u9ed8\u8ba4&#xff0c;\u6839\u636e\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a\u9762\u5411\u6570\u636e\u62a5&#xff0c;\u81ea\u52a8\u8bc6\u522b\u4e3aUDP\u534f\u8bae<\/span><br \/>\n        _sockfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span>SOCK_DGRAM<span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;socket create error!!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;socket create success,sockfd : &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> _sockfd <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/\u586b\u5145\u7f51\u7edc\u901a\u4fe1\u76f8\u5173\u4fe1\u606f<\/span><br \/>\n        <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> local<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>local<span class=\"token punctuation\">,<\/span><span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        local<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n        local<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span>_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        local<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> INADDR_ANY<span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u7ed1\u5b9aINADDR_ANY<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/\u7ed1\u5b9a<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>local<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;bind error!!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;bind success &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token operator\">~<\/span><span class=\"token function\">UdpServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> _sockfd<span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> _port<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/\u7aef\u53e3\u53f7<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string _ip<span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/IP\u5730\u5740<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> argc<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> argv<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>argc <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Usage: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> argv<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034; port&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string ip <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;47.94.84.249&#034;<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u672c\u5730\u73af\u56de<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">atoi<\/span><span class=\"token punctuation\">(<\/span>argv<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    UdpServer<span class=\"token operator\">*<\/span> srv <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token function\">UdpServer<\/span><span class=\"token punctuation\">(<\/span>ip<span class=\"token punctuation\">,<\/span>port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    srv<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">InitServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    srv<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">Start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>&#x1f30e;\u5ba2\u6237\u7aef\u4ee3\u7801\u6539\u5199<\/p>\n<p>\u670d\u52a1\u7aef\u7684\u4ee3\u7801\u6539\u4e86\u4e4b\u540e&#xff0c;\u5bf9\u5e94\u5ba2\u6237\u7aef\u7684\u4ee3\u7801\u4e5f\u5f97\u6539\u6539\u3002\u5f53\u5ba2\u6237\u7aef\u53d1\u5b8c\u6570\u636e\u7ed9\u670d\u52a1\u7aef\u540e&#xff0c;\u7531\u4e8e\u670d\u52a1\u7aef\u8fd8\u4f1a\u5c06\u8be5\u6570\u636e\u91cd\u65b0\u53d1\u7ed9\u5ba2\u6237\u7aef&#xff0c;\u56e0\u6b64\u5ba2\u6237\u7aef\u53d1\u5b8c\u6570\u636e\u540e\u8fd8\u9700\u8981\u8c03recvfrom\u6765\u8bfb\u53d6\u670d\u52a1\u7aef\u53d1\u6765\u7684\u54cd\u5e94\u6570\u636e\u3002<\/p>\n<p>\u5728\u5ba2\u6237\u7aef\u8c03\u7528recvfrom\u51fd\u6570\u63a5\u6536\u670d\u52a1\u7aef\u53d1\u6765\u7684\u54cd\u5e94\u6570\u636e\u65f6&#xff0c;\u5ba2\u6237\u7aef\u540c\u65f6\u4e5f\u9700\u8981\u8bfb\u53d6\u670d\u52a1\u7aef\u4e0e\u7f51\u7edc\u76f8\u5173\u7684\u5404\u79cd\u4fe1\u606f\u3002\u867d\u7136\u5ba2\u6237\u7aef\u65e9\u5df2\u77e5\u9053\u670d\u52a1\u7aef\u7684\u7f51\u7edc\u4fe1\u606f\u4e86&#xff0c;\u6b64\u65f6\u670d\u52a1\u7aef\u7684\u7f51\u7edc\u4fe1\u606f\u5df2\u7ecf\u4e0d\u91cd\u8981\u4e86&#xff0c;\u4f46\u8fd8\u662f\u5efa\u8bae\u4e0d\u8981\u628a\u53c2\u6570\u8bbe\u7f6e\u4e3a\u7a7a&#xff0c;\u8fd9\u6837\u53ef\u80fd\u4f1a\u51fa\u95ee\u9898&#xff0c;\u6240\u4ee5\u6211\u4eec\u8fd8\u662f\u7528\u4e00\u4e2a\u4e34\u65f6\u53d8\u91cf\u5c06\u670d\u52a1\u7aef\u7684\u7f51\u7edc\u4fe1\u606f\u8bfb\u53d6\u4e00\u4e0b\u3002<\/p>\n<p>\u800c\u5ba2\u6237\u7aef\u63a5\u6536\u5230\u670d\u52a1\u7aef\u7684\u54cd\u5e94\u6570\u636e\u540e&#xff0c;\u5c06\u6570\u636e\u539f\u5c01\u4e0d\u52a8\u7684\u6253\u5370\u51fa\u6765\u5c31\u884c\u4e86\u3002\u6b64\u65f6\u5ba2\u6237\u7aef\u53d1\u9001\u7ed9\u670d\u52a1\u7aef\u7684\u6570\u636e&#xff0c;\u9664\u4e86\u5728\u670d\u52a1\u7aef\u4f1a\u6253\u5370\u663e\u793a\u4ee5\u5916&#xff0c;\u670d\u52a1\u7aef\u8fd8\u4f1a\u5c06\u6570\u636e\u518d\u91cd\u65b0\u53d1\u56de\u7ed9\u5ba2\u6237\u7aef&#xff0c;\u6b64\u65f6\u5ba2\u6237\u7aef\u4e5f\u4f1a\u63a5\u6536\u5230\u54cd\u5e94\u6570\u636e\u7136\u540e\u5c06\u8be5\u6570\u636e\u8fdb\u884c\u6253\u5370\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/socket.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/types.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdint.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;memory&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;cstring&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;netinet\/in.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;arpa\/inet.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">int<\/span> BUFFERSIZE <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">128<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UdpClient<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">UdpClient<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span>string ip<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">uint16_t<\/span> port<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token operator\">:<\/span><span class=\"token function\">_sockfd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">,<\/span><span class=\"token function\">_server_port<\/span><span class=\"token punctuation\">(<\/span>port<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">,<\/span><span class=\"token function\">_server_ip<\/span><span class=\"token punctuation\">(<\/span>ip<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">Start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>string msg<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/\u76ee\u6807\u670d\u52a1\u5668\u4fe1\u606f<\/span><br \/>\n        <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> peer<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>peer<span class=\"token punctuation\">,<\/span><span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>peer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        peer<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n        peer<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span>_server_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        peer<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">inet_addr<\/span><span class=\"token punctuation\">(<\/span>_server_ip<span class=\"token punctuation\">.<\/span><span class=\"token function\">c_str<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Please Enter# &#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">getline<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span>cin<span class=\"token punctuation\">,<\/span>msg<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">sendto<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span>msg<span class=\"token punctuation\">.<\/span><span class=\"token function\">c_str<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>msg<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>peer<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>peer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token keyword\">char<\/span> buffer<span class=\"token punctuation\">[<\/span>BUFFERSIZE<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> tmp<span class=\"token punctuation\">;<\/span><br \/>\n            socklen_t len <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>tmp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            ssize_t size <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">recvfrom<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span>buffer<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buffer<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>tmp<span class=\"token punctuation\">,<\/span><span class=\"token operator\">&amp;<\/span>len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>size <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><br \/>\n                std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;recvfrom error!!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            buffer<span class=\"token punctuation\">[<\/span>size<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> buffer <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">bool<\/span> <span class=\"token function\">InitClient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/\u521b\u5efa\u5957\u63a5\u5b57<\/span><br \/>\n        _sockfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span>SOCK_DGRAM<span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;create sockfd error!!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token operator\">~<\/span><span class=\"token function\">UdpClient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> _sockfd<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> _server_port<span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/\u670d\u52a1\u5668\u7aef\u53e3\u53f7<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string _server_ip<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/\u670d\u52a1\u5668ip<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> argc<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> argv<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>argc <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Usage: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> argv<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034; server_ip server_port&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string serverip <span class=\"token operator\">&#061;<\/span> argv<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> serverport <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">atoi<\/span><span class=\"token punctuation\">(<\/span>argv<span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    UdpClient<span class=\"token operator\">*<\/span> clt <span class=\"token operator\">&#061;<\/span> 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