{"id":33027,"date":"2025-04-26T10:27:06","date_gmt":"2025-04-26T02:27:06","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/33027.html"},"modified":"2025-04-26T10:27:06","modified_gmt":"2025-04-26T02:27:06","slug":"%e3%80%90%e5%ae%89%e5%85%a8%e6%89%ab%e6%8f%8f%e5%99%a8%e5%8e%9f%e7%90%86%e3%80%91tcp-ip%e5%8d%8f%e8%ae%ae%e7%bc%96%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/33027.html","title":{"rendered":"\u3010\u5b89\u5168\u626b\u63cf\u5668\u539f\u7406\u3011TCP\/IP\u534f\u8bae\u7f16\u7a0b"},"content":{"rendered":"<\/p>\n<h4>\u3010\u5b89\u5168\u626b\u63cf\u5668\u539f\u7406\u3011TCP\/IP\u534f\u8bae\u7f16\u7a0b<\/h4>\n<ul>\n<li>1.\u6982\u8ff0<\/li>\n<li>2.Windows Socket\u7ed3\u6784<\/li>\n<li>3.Windows socket\u8f6c\u6362\u7c7b\u51fd\u6570<\/li>\n<li>4.Windows Socket\u901a\u4fe1\u7c7b\u51fd\u6570<\/li>\n<\/ul>\n<h2>1.\u6982\u8ff0<\/h2>\n<p>TCP\/IP\u534f\u8bae\u662f\u76ee\u524d\u7f51\u7edc\u4e2d\u4f7f\u7528\u6700\u5e7f\u6cdb\u7684\u534f\u8bae&#xff0c;Socket\u79f0\u4e3a\u201c\u5957\u63a5\u53e3\u201d\u200b&#xff0c;\u6700\u65e9\u51fa\u73b0\u5728Berkeley Unix\u4e2d&#xff0c;\u6700\u521d\u53ea\u652f\u6301TCP\/IP\u534f\u8bae\u65cf\u548cUnix\u534f\u8bae&#xff0c;\u73b0\u5728\u5b83\u5df2\u652f\u6301\u5f88\u591a\u534f\u8bae&#xff0c;\u662f\u6700\u91cd\u8981\u7684\u7f51\u7edc\u7f16\u7a0b\u63a5\u53e3<\/p>\n<p>1\u3001\u7aef\u53e3&#xff08;Port&#xff09;\u548c\u5957\u63a5\u53e3<\/p>\n<p>\u7aef\u53e3\u6b63\u662f\u6211\u4eec\u8981\u626b\u63cf\u7684\u5bf9\u8c61&#xff0c;\u5177\u6709\u201c\u5f00\u201d\u548c\u201c\u5173\u201d\u4e24\u79cd\u72b6\u6001&#xff0c;\u5229\u7528\u5b83\u7684\u5f00\u6216\u5173\u72b6\u6001\u5c31\u53ef\u4ee5\u521d\u6b65\u5224\u65ad\u4e00\u53f0\u4e3b\u673a\u662f\u5426\u63d0\u4f9b\u4e86\u67d0\u79cd\u670d\u52a1<\/p>\n<p>\u548c\u7aef\u53e3\u6240\u5728\u4e3b\u673a\u7684IP\u5730\u5740\u7ed3\u5408\u8d77\u6765&#xff0c;\u6240\u5f62\u6210\u7684\u4e00\u4e2a\u4e8c\u5143\u7ec4&#xff08;IP\u5730\u5740&#xff0c;\u7aef\u53e3\u5730\u5740&#xff09;\u5c31\u7ec4\u6210\u4e86\u4e00\u4e2a\u5957\u63a5\u53e3\u3002\u4e00\u4e2a\u4e94\u5143\u7ec4&#xff08;\u672c\u5730IP\u3001\u672c\u5730\u7aef\u53e3\u3001\u4f7f\u7528\u534f\u8bae\u3001\u8fdc\u7a0bIP\u3001\u8fdc\u7a0b\u7aef\u53e3&#xff09;\u7ec4\u6210\u4e86\u4e00\u4e2a\u901a\u4fe1\u8fc7\u7a0b<\/p>\n<p>\u4e00\u4e2aIPv4\u7684\u57fa\u672c\u6570\u636e\u7ed3\u6784\u4e3b\u8981\u6709in_addr\u548csockaddr_in\u4e24\u4e2a&#xff0c;\u524d\u8005\u8868\u793a32\u4f4d\u7684IP\u5730\u5740&#xff0c;\u540e\u8005\u662f\u901a\u7528\u7684\u5957\u63a5\u53e3\u5730\u5740\u7ed3\u6784<\/p>\n<p><span class=\"token comment\">\/\/ in_addr \u662f\u7528\u6765\u8868\u793a\u4e00\u4e2a IPv4 \u5730\u5740&#xff08;32 \u4f4d&#xff09; \u7684\u7ed3\u6784\u4f53<\/span><br \/>\n<span class=\"token comment\">\/\/ s_addr&#xff1a;\u4e00\u4e2a 32 \u4f4d\u7684\u6574\u6570&#xff0c;\u8868\u793a IP \u5730\u5740<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">in_addr<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    in_addr_t s_addr<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">short<\/span>            sin_family<span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u5730\u5740\u65cf&#xff0c;\u5fc5\u987b\u662f AF_INET&#xff08;IPv4&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">short<\/span>   sin_port<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/ \u7aef\u53e3\u53f7&#xff08;\u4f7f\u7528\u7f51\u7edc\u5b57\u8282\u5e8f&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">in_addr<\/span>   sin_addr<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/ IPv4 \u5730\u5740<\/span><br \/>\n    <span class=\"token keyword\">char<\/span>             sin_zero<span class=\"token punctuation\">[<\/span><span class=\"token number\">8<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u586b\u5145\u5b57\u6bb5&#xff0c;\u4fdd\u6301\u7ed3\u6784\u4f53\u5927\u5c0f\u4e00\u81f4&#xff08;\u901a\u5e38\u7f6e\u4e3a0&#xff09;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>2\u3001\u5730\u5740\u8868\u793a\u987a\u5e8f<\/p>\n<p>\u800c\u7f51\u7edc\u4f20\u8f93\u4e2d&#xff0c;\u6570\u636e\u5b58\u50a8\u987a\u5e8f\u4e0d\u4e00\u5b9a\u548c\u7cfb\u7edf\u5b58\u50a8\u987a\u5e8f\u4e00\u6837&#xff0c;\u56e0\u6b64\u4e3a\u4fdd\u8bc1\u7cfb\u7edf\u6b63\u786e\u6027\u548c\u53ef\u79fb\u690d\u6027&#xff0c;\u9700\u8981\u5229\u7528\u7cfb\u7edf\u7684\u8f6c\u6362\u51fd\u6570\u8fdb\u884c\u8f6c\u6362\u3002\u4ee5IPv4\u7684\u5730\u5740\u4e3a\u4f8b&#xff0c;\u4e00\u4e2aIP\u5730\u5740\u7684\u56db\u4e2a\u5b57\u8282\u201c192.168.1.100\u201d\u200b&#xff0c;\u5728PC\u67b6\u6784\u7684\u8ba1\u7b97\u673a\u4e2d&#xff0c;\u6570\u636e\u7684\u8868\u793a\u662f\u4f4e\u4f4d\u4f18\u5148\u200b&#xff0c;\u7531\u524d\u81f3\u540e\u662f100\u30011\u3001168\u3001192&#xff1b;\u800c\u5728\u7f51\u7edcSocket\u534f\u8bae\u6240\u8868\u793a\u7684\u7f51\u7edc\u4f20\u8f93\u4e2d&#xff0c;\u5219\u662f\u9ad8\u4f4d\u4f18\u5148\u200b&#xff0c;\u7531\u524d\u81f3\u540e\u662f192\u3001168\u30011\u3001100&#xff0c;\u8fd9\u9700\u8981\u5728\u5904\u7406\u65f6\u901a\u8fc7\u51fd\u6570\u8f6c\u5316<\/p>\n<p>3\u3001\u9762\u5411\u8fde\u63a5\u548c\u9762\u5411\u975e\u8fde\u63a5<\/p>\n<p>\u9762\u5411\u8fde\u63a5&#xff08;\u5373TCP&#xff09;\u7684\u901a\u4fe1\u7684\u53cc\u65b9&#xff0c;\u53d1\u8d77\u8fde\u63a5\u7684\u4e3a\u5ba2\u6237\u7aef&#xff0c;\u63a5\u6536\u8fde\u63a5\u7684\u4e00\u65b9\u79f0\u4e3a\u670d\u52a1\u5668\u7aef\u3002\u53cc\u65b9\u7684\u901a\u4fe1\u4e00\u822c\u5206\u4e09\u6b65&#xff1a;\u5efa\u7acb\u8fde\u63a5\u3001\u6570\u636e\u4f20\u9001\u3001\u91ca\u653e\u8fde\u63a5\u3002\u5728\u4f20\u9001\u8fc7\u7a0b\u4e2d\u6570\u636e\u6309\u987a\u5e8f\u4f20\u9001<\/p>\n<p>\u9762\u5411\u975e\u8fde\u63a5&#xff08;\u5373UDP&#xff09;\u7684\u901a\u4fe1\u4e2d&#xff0c;\u6ca1\u6709\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u7aef\u4e4b\u5206&#xff0c;\u6216\u8005\u79f0\u4e3a\u4e92\u4e3a\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u7aef\u3002\u53cc\u65b9\u4e2d\u7684\u4efb\u4f55\u4e00\u65b9\u90fd\u53ef\u4ee5\u968f\u65f6\u5411\u5bf9\u65b9\u53d1\u9001\u6570\u636e\u6216\u63a5\u6536\u5bf9\u65b9\u7684\u6570\u636e<\/p>\n<p>\u9762\u5411\u8fde\u63a5\u548c\u9762\u5411\u975e\u8fde\u63a5\u533a\u522b&#xff1a;<\/p>\n<ul>\n<li>\u9762\u5411\u8fde\u63a5\u7684\u60c5\u51b5\u4e0b&#xff0c;\u51fd\u6570\u4f1a\u660e\u786e\u544a\u8bc9\u53d1\u9001\u6210\u529f&#xff0c;\u4f46\u5bf9\u65b9\u672a\u63a5\u5230&#xff1b;\u800c\u9762\u5411\u975e\u8fde\u63a5\u7684\u60c5\u51b5\u4e0b&#xff0c;\u51fd\u6570\u53ea\u662f\u544a\u8bc9\u53d1\u9001\u6210\u529f&#xff0c;\u4e0d\u4f1a\u544a\u8bc9\u5bf9\u65b9\u662f\u5426\u63a5\u5230<\/li>\n<li>\u4e24\u53f0\u7535\u8111\u4e4b\u95f4\u8fde\u63a5\u4e86\u4e00\u4e2a\u5c0f\u65f6\u672a\u901a\u4fe1&#xff0c;\u5728\u9762\u5411\u8fde\u63a5\u7684\u65b9\u5f0f\u4e0b&#xff0c;\u8fd9\u4e24\u53f0\u7535\u8111\u4e4b\u95f4\u4f1a\u4e0d\u505c\u5730\u53d1\u9001\u786e\u8ba4\u4fe1\u606f\u4ee5\u786e\u5b9a\u94fe\u8def\u662f\u5426\u8fde\u901a&#xff1b;\u800c\u9762\u5411\u975e\u8fde\u63a5\u7684\u65b9\u5f0f\u5219\u6ca1\u6709\u8fd9\u4e9b\u7ef4\u62a4\u4fe1\u606f<\/li>\n<\/ul>\n<p>4\u3001\u539f\u59cb\u5957\u63a5\u5b57<\/p>\n<p>\u5982\u679c\u4e0d\u4f7f\u7528\u539f\u59cb\u5957\u63a5\u5b57&#xff0c;\u5219\u65e0\u8bba\u662f\u53d1\u9001\u548c\u63a5\u6536&#xff0c;\u7cfb\u7edf\u90fd\u4f1a\u81ea\u52a8\u5904\u7406IP\u5305\u5934\u3001TCP\/UDP\u5305\u5934\u7684\u6570\u636e&#xff0c;\u8fd9\u65f6\u7528\u6237\u53ea\u9700\u8981\u5173\u5fc3\u53d1\u9001\u548c\u63a5\u6536\u7684\u6570\u636e\u672c\u8eab\u5373\u53ef\u3002\u8fd9\u79cd\u81ea\u52a8\u5904\u7406\u867d\u7136\u65b9\u4fbf&#xff0c;\u4f46\u4e5f\u4f7f\u7cfb\u7edf\u5931\u53bb\u4e86\u7075\u6d3b\u6027\u3002\u800c\u5f53\u4f7f\u7528\u539f\u59cb\u5957\u63a5\u5b57\u65f6&#xff0c;\u5982\u679c\u53d1\u9001\u6570\u636e&#xff0c;\u7cfb\u7edf\u4f1a\u5c06\u8981\u53d1\u9001\u7684\u6570\u636e\u5305\u7684\u524d\u9762\u82e5\u5e72\u5b57\u8282\u6570\u636eIP\u5934\u3001TCP\/UDP\u5934&#xff1b;\u5982\u679c\u63a5\u6536\u6570\u636e&#xff0c;\u7cfb\u7edf\u4f1a\u5c06\u63a5\u6536\u5230\u7684\u6570\u636e\u5305\u524d\u9762\u52a0\u4e0a\u6570\u636eIP\u5934\u3001TCP\/UDP\u5934<\/p>\n<hr \/>\n<h2>2.Windows Socket\u7ed3\u6784<\/h2>\n<p>1\u3001sockaddr\u7ed3\u6784<\/p>\n<p>\u8be5\u7ed3\u6784\u7528\u4e8e\u4fdd\u5b58\u4e00\u4e2aIP\u5730\u5740&#xff0c;\u4f46\u8fd9\u4e2a\u7ed3\u6784\u4e0d\u5305\u542b\u5177\u4f53\u534f\u8bae\u5b57\u6bb5&#xff0c;\u56e0\u6b64\u901a\u5e38\u4e0d\u76f4\u63a5\u4f7f\u7528&#xff0c;\u800c\u662f\u4f5c\u4e3a\u63a5\u53e3\u53c2\u6570\u6765\u4f20\u9012\u5b9e\u9645\u7ed3\u6784&#xff08;\u5982 sockaddr_in&#xff09;<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">short<\/span> sa_family<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5730\u5740\u65cf&#xff08;\u5982 AF_INET&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> sa_data<span class=\"token punctuation\">[<\/span><span class=\"token number\">14<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span>         <span class=\"token comment\">\/\/ \u5b58\u653e\u7aef\u53e3\u53f7\u548c\u5730\u5740<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>2\u3001sockaddr_in\u7ed3\u6784<\/p>\n<p>\u8fd9\u4e2a\u7ed3\u6784\u662fIPv4\u4e13\u7528\u7684\u7ed3\u6784&#xff0c;\u5305\u542b\u4e86 IP \u5730\u5740\u548c\u7aef\u53e3\u53f7\u7684\u5177\u4f53\u4fe1\u606f<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">short<\/span> sin_family<span class=\"token punctuation\">;<\/span>           <span class=\"token comment\">\/\/ \u5730\u5740\u65cf&#xff0c;\u4e00\u822c\u662f AF_INET<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">short<\/span> sin_port<span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u7aef\u53e3\u53f7&#xff08;\u9700\u8981\u7528 htons() \u8f6c\u6362\u4e3a\u7f51\u7edc\u5b57\u8282\u5e8f&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">in_addr<\/span> sin_addr<span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ IP \u5730\u5740<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> sin_zero<span class=\"token punctuation\">[<\/span><span class=\"token number\">8<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span>          <span class=\"token comment\">\/\/ \u8865\u9f50\u7528&#xff0c;\u4e0d\u4f7f\u7528&#xff0c;\u9700\u586b0<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5176\u4e2d\u771f\u6b63\u5b58\u50a8IP\u7ed3\u6784\u7684sin_addr\u53d8\u91cf\u53c8\u662f\u4e00\u4e2a\u7ed3\u6784&#xff0c;\u5185\u90e8\u662f\u4e2a\u8054\u5408\u4f53&#xff0c;\u6709\u4e09\u79cd\u8bbf\u95ee\u65b9\u5f0f&#xff1a;<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">in_addr<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">union<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">struct<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> s_b1<span class=\"token punctuation\">,<\/span> s_b2<span class=\"token punctuation\">,<\/span> s_b3<span class=\"token punctuation\">,<\/span> s_b4<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> S_un_b<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/ \u6309\u5b57\u8282\u8bbf\u95eeIP<\/span><br \/>\n        <span class=\"token keyword\">struct<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">short<\/span> s_w1<span class=\"token punctuation\">,<\/span> s_w2<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> S_un_w<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/ \u6309\u53cc\u5b57\u8282\u8bbf\u95eeIP<\/span><br \/>\n        <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> S_addr<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u4e00\u822c\u4f7f\u7528\u8fd9\u4e2a\u5b57\u6bb5&#xff08;\u7f51\u7edc\u5b57\u8282\u5e8f&#xff09;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> S_un<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5728\u5b9e\u9645\u4f7f\u7528\u4e2d&#xff0c;\u53ef\u4ee5\u8fd9\u6837\u8bbf\u95ee\u548c\u8d4b\u503c&#xff1a;<\/p>\n<p>sockaddr_in addr<span class=\"token punctuation\">;<\/span><br \/>\naddr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\naddr<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">8080<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\naddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>S_un<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><span class=\"token string\">&#034;127.0.0.1&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6709\u7684\u670d\u52a1\u5668\u6709\u591a\u4e2a\u7f51\u5361&#xff0c;\u6b64\u65f6\u4f1a\u6709\u591a\u4e2aIP\u5730\u5740&#xff0c;\u6216\u662f\u4e00\u4e2a\u7f51\u5361\u914d\u7f6e\u591a\u4e2aIP\u5730\u5740&#xff0c;\u800c\u5f53\u524d\u7684\u7a0b\u5e8f\u5e76\u4e0d\u60f3\u53ea\u7ed1\u5b9a\u67d0\u4e00\u4e2aIP\u5730\u5740&#xff0c;\u8fd9\u65f6\u53ef\u4ee5\u8bbe\u7f6eS_addr\u4e3ahtonl(INADDR_ANY)&#xff1a;<\/p>\n<p>addr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>S_un<span class=\"token punctuation\">.<\/span>S_addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htonl<\/span><span class=\"token punctuation\">(<\/span>INADDR_ANY<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>3\u3001hostent\u7ed3\u6784<\/p>\n<p>\u4e3b\u8981\u7528\u4e8e\u5b58\u50a8\u4e3b\u673a\u7684\u89e3\u6790\u4fe1\u606f&#xff0c;\u6bd4\u5982\u57df\u540d\u89e3\u6790\u6210 IP \u540e\u7684\u7ed3\u679c<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">hostent<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">char<\/span>  <span class=\"token operator\">*<\/span>h_name<span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/ \u5b98\u65b9\u4e3b\u673a\u540d&#xff08;\u5982&#xff1a;www.example.com&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span><span class=\"token operator\">*<\/span>h_aliases<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/ \u4e3b\u673a\u522b\u540d&#xff08;\u4e00\u4e2a\u4ee5NULL\u7ed3\u5c3e\u7684\u5b57\u7b26\u4e32\u6570\u7ec4&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">short<\/span>  h_addrtype<span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ \u5730\u5740\u7c7b\u578b&#xff08;\u5982 AF_INET \u8868\u793a IPv4&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">short<\/span>  h_length<span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ \u5730\u5740\u957f\u5ea6&#xff08;IPv4\u662f4\u5b57\u8282&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span><span class=\"token operator\">*<\/span>h_addr_list<span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u5730\u5740\u5217\u8868&#xff08;\u6bcf\u4e2a\u90fd\u662f\u4e00\u4e2a IP \u5730\u5740\u7684\u6307\u9488&#xff09;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>4\u3001servent\u7ed3\u6784<\/p>\n<p>\u901a\u5e38\u662f\u7528\u4e8e \u670d\u52a1&#xff08;Service&#xff09;\u540d\u5230\u7aef\u53e3\u53f7\u7684\u89e3\u6790<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">servent<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">char<\/span>  <span class=\"token operator\">*<\/span>s_name<span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ \u670d\u52a1\u540d\u79f0&#xff08;\u5982 &#034;http&#034;&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span><span class=\"token operator\">*<\/span>s_aliases<span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u670d\u52a1\u522b\u540d&#xff08;\u4ee5 NULL \u7ed3\u5c3e\u7684\u5b57\u7b26\u4e32\u6570\u7ec4&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">short<\/span>  s_port<span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ \u7aef\u53e3\u53f7&#xff08;\u7f51\u7edc\u5b57\u8282\u5e8f&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span>  <span class=\"token operator\">*<\/span>s_proto<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/ \u534f\u8bae\u540d\u79f0&#xff08;\u5982 &#034;tcp&#034; \u6216 &#034;udp&#034;&#xff09;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<hr \/>\n<h2>3.Windows socket\u8f6c\u6362\u7c7b\u51fd\u6570<\/h2>\n<p>1\u3001htons\u51fd\u6570<\/p>\n<p>htons\u51fd\u6570\u5c06\u8ba1\u7b97\u673a\u5b58\u50a8\u7684USHORT\u683c\u5f0f\u8f6c\u6362\u4e3a\u7f51\u7edc\u5b58\u50a8\u7684USHORT\u683c\u5f0f&#xff0c;16\u4f4d&#xff0c;\u4e00\u822c\u540c\u4e8e\u4f20\u8f93\u7aef\u53e3<\/p>\n<p>\u7f51\u7edc\u4f20\u8f93\u8981\u6c42\u6240\u6709\u591a\u5b57\u8282\u6570\u503c\u7edf\u4e00\u4e3a \u5927\u7aef\u683c\u5f0f&#xff08;\u9ad8\u4f4d\u5728\u524d&#xff09;&#xff0c;\u4ee5\u4fdd\u8bc1\u8de8\u5e73\u53f0\u901a\u4fe1\u4e00\u81f4\u6027\u3002\u56e0\u6b64&#xff0c;\u5728\u5c06\u7aef\u53e3\u53f7\u7b49\u6570\u503c\u7528\u4e8e\u7f51\u7edc\u4f20\u8f93\u524d\u5fc5\u987b\u8c03\u7528 htons()<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> server_addr<span class=\"token punctuation\">;<\/span><\/p>\n<p>server_addr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\nserver_addr<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">80<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5c06\u4e3b\u673a\u5b57\u8282\u5e8f\u7684\u7aef\u53e380\u8f6c\u6362\u4e3a\u7f51\u7edc\u5b57\u8282\u5e8f<\/span><br \/>\nserver_addr<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><span class=\"token string\">&#034;192.168.1.1&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>2\u3001ntohs\u51fd\u6570<\/p>\n<p>ntohs\u51fd\u6570\u5c06\u7f51\u7edc\u5b58\u50a8\u7684USHORT\u683c\u5f0f\u8f6c\u6362\u4e3a\u8ba1\u7b97\u673a\u5b58\u50a8\u7684USHORT\u683c\u5f0f<\/p>\n<p>3\u3001htonl\u51fd\u6570<\/p>\n<p>htonl() \u4e3b\u8981\u7528\u4e8e IP \u5730\u5740\u7b49\u9700\u8981\u4f7f\u7528 32 \u4f4d\u6574\u6570\u4f20\u8f93\u7684\u573a\u666f\u3002\u5c06\u8ba1\u7b97\u673a\u5b58\u50a8\u7684ULONG\u683c\u5f0f\u8f6c\u6362\u4e3a\u7f51\u7edc\u5b58\u50a8ULONG\u683c\u5f0f<\/p>\n<p>4\u3001ntohl\u51fd\u6570<\/p>\n<p>ntohl\u51fd\u6570\u5c06\u7f51\u7edc\u5b58\u50a8\u7684ULONG\u683c\u5f0f\u8f6c\u6362\u4e3a\u8ba1\u7b97\u673a\u5b58\u50a8\u7684ULONG\u683c\u5f0f&#xff0c;\u662f32\u4f4d\u7684<\/p>\n<p>5\u3001inet_ntoa\u51fd\u6570<\/p>\n<p>inet_ntoa\u51fd\u6570\u5c06\u7531in_addr\u7ed3\u6784\u6240\u8868\u793a\u7684\u7f51\u7edc\u5730\u5740&#xff0c;\u8f6c\u6362\u6210\u7531\u5b57\u7b26\u4e32\u8868\u793a\u7684IP\u5730\u5740<\/p>\n<p>6\u3001inet_addr\u51fd\u6570<\/p>\n<p>inet_addr\u51fd\u6570\u5c06\u5b57\u7b26\u4e32\u7ec4\u6210\u7684IP\u5730\u5740\u4e32\u8f6c\u6362\u6210\u4e00\u4e2aULONG\u7684\u6574\u6570&#xff0c;\u8be5\u6574\u6570\u53ef\u7528\u4e8ein_addr\u7ed3\u6784\u4e2d&#xff0c;\u662f\u6309\u7f51\u7edc\u683c\u5f0f\u5b58\u50a8\u7684<\/p>\n<p>7\u3001gethostbyname\u51fd\u6570<\/p>\n<p>gethostbyname\u51fd\u6570\u6839\u636e\u4e3b\u673a\u540d\u8bfb\u53d6\u4e3b\u673a\u7684\u4fe1\u606f&#xff08;\u4e3b\u8981\u662fIP\u5730\u5740&#xff09;\u200b<\/p>\n<p>8\u3001gethostbyaddr\u51fd\u6570<\/p>\n<p>gethostbyaddr\u51fd\u6570\u901a\u8fc7\u7f51\u7edc\u5730\u5740\u8bfb\u53d6\u4e3b\u673a\u4fe1\u606f<\/p>\n<p>9\u3001gethostname\u51fd\u6570<\/p>\n<p>gethostname\u51fd\u6570\u8bfb\u53d6\u672c\u5730\u4e3b\u673a\u7684\u4e3b\u673a\u540d<\/p>\n<p>10\u3001getservbyname\u51fd\u6570<\/p>\n<p>getservbyname\u51fd\u6570\u6839\u636e\u670d\u52a1\u540d\u548c\u534f\u8bae\u8bfb\u53d6\u670d\u52a1\u4fe1\u606f<\/p>\n<p>11\u3001getservbyport\u51fd\u6570<\/p>\n<p>getservbyport\u51fd\u6570\u6839\u636e\u7aef\u53e3\u548c\u534f\u8bae\u8bfb\u53d6\u670d\u52a1\u4fe1\u606f<\/p>\n<hr \/>\n<h2>4.Windows Socket\u901a\u4fe1\u7c7b\u51fd\u6570<\/h2>\n<p>\u5728\u4f7f\u7528 Windows Socket \u901a\u4fe1\u7c7b\u51fd\u6570\u65f6&#xff0c;\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u51e0\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u7248\u672c\u8981\u6c42&#xff1a;\u8fd9\u4e9b\u51fd\u6570\u81f3\u5c11\u57fa\u4e8e Winsock 1.1 \u7248\u672c\u6216\u66f4\u9ad8\u7248\u672c&#xff08;\u5982 Winsock 2.2&#xff09;\u3002\u5728\u7f16\u7a0b\u65f6\u901a\u5e38\u4f7f\u7528\u7684\u662f Winsock 2.x<\/li>\n<li>\u5934\u6587\u4ef6\u5f15\u5165&#xff1a;\u5728\u6e90\u6587\u4ef6\u4e2d\u9700\u8981\u5305\u542b\u5934\u6587\u4ef6 Winsock2.h<\/li>\n<li>\u94fe\u63a5\u5e93\u8bbe\u7f6e&#xff1a;\u5728\u94fe\u63a5\u9636\u6bb5\u9700\u8981\u94fe\u63a5 Ws2_32.lib \u9759\u6001\u5e93&#xff0c;\u5426\u5219\u7f16\u8bd1\u65f6\u4f1a\u51fa\u73b0\u672a\u89e3\u6790\u7684\u5916\u90e8\u7b26\u53f7\u9519\u8bef<\/li>\n<\/ul>\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;Winsock2.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">pragma<\/span> <span class=\"token expression\"><span class=\"token function\">comment<\/span><span class=\"token punctuation\">(<\/span>lib<span class=\"token punctuation\">,<\/span> <\/span><span class=\"token string\">&#034;Ws2_32.lib&#034;<\/span><span class=\"token expression\"><span class=\"token punctuation\">)<\/span><\/span><\/span><\/p>\n<p>1\u3001WSAStartup\u51fd\u6570<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">WSAStartup<\/span><span class=\"token punctuation\">(<\/span>WORD wVersionRequested<span class=\"token punctuation\">,<\/span> LPWSADATA lpWSAData<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>WSAStartup \u7528\u4e8e\u521d\u59cb\u5316 Windows Sockets 2&#xff08;WinSock2&#xff09;\u5e93&#xff0c;\u5b83\u4f1a\u68c0\u67e5\u64cd\u4f5c\u7cfb\u7edf\u662f\u5426\u652f\u6301\u6240\u8bf7\u6c42\u7684 Socket \u7248\u672c&#xff0c;\u5e76\u5efa\u7acb\u5e95\u5c42\u901a\u4fe1\u673a\u5236\u3002\u5fc5\u987b\u6700\u5148\u8c03\u7528\u8be5\u51fd\u6570&#xff0c;\u5426\u5219\u4e4b\u540e\u7684\u6240\u6709 Socket API \u90fd\u4e0d\u80fd\u4f7f\u7528<\/p>\n<p>\u7a0b\u5e8f\u542f\u52a8<br \/>\n   \u2193<br \/>\n\u8c03\u7528 <span class=\"token function\">WSAStartup<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n   \u2193<br \/>\n\u5224\u65ad\u7248\u672c\u652f\u6301 <span class=\"token operator\">&amp;<\/span> \u521d\u59cb\u5316\u6210\u529f&#xff1f;<br \/>\n   \u2193                  \u2198<br \/>\n \u662f \u2192 \u7ee7\u7eed\u4f7f\u7528 Socket     \u5426 \u2192 \u8fd4\u56de\u9519\u8bef\u7801&#xff08;\u4e0d\u80fd\u4f7f\u7528 WSAGetLastError&#xff09;<\/p>\n<p>\u4ee3\u7801\u6848\u4f8b&#xff1a;<\/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;Winsock2.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">pragma<\/span> <span class=\"token expression\"><span class=\"token function\">comment<\/span><span class=\"token punctuation\">(<\/span>lib<span class=\"token punctuation\">,<\/span> <\/span><span class=\"token string\">&#034;Ws2_32.lib&#034;<\/span><span class=\"token expression\"><span class=\"token punctuation\">)<\/span><\/span><\/span><\/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> <span class=\"token punctuation\">{<\/span><br \/>\n    WSADATA wsaData<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> result <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">WSAStartup<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">MAKEWORD<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>wsaData<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>result <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;WSAStartup failed: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> result<span class=\"token punctuation\">)<\/span><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><\/p>\n<p>    <span class=\"token comment\">\/\/ \u540e\u7eed Socket \u64cd\u4f5c&#8230;<\/span><\/p>\n<p>    <span class=\"token function\">WSACleanup<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u4f7f\u7528\u5b8c\u6210\u540e\u6e05\u7406<\/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>2\u3001WSACleanup\u51fd\u6570<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">WSACleanup<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>WSACleanup\u51fd\u6570\u5b8c\u6210\u4e0esocket\u5e93\u7ed1\u5b9a\u7684\u89e3\u9664&#xff0c;\u5e76\u91ca\u653esocket\u5e93\u6240\u5360\u7528\u7684\u7cfb\u7edf\u8d44\u6e90\u3002\u8be5\u51fd\u6570\u5e94\u8be5\u4f5c\u4e3a\u67d0\u6b21socket\u64cd\u4f5c\u7684\u6700\u540e\u4e00\u4e2a\u51fd\u6570&#xff0c;\u5426\u5219\u4e4b\u540e\u4efb\u4f55socket\u64cd\u4f5c\u90fd\u4f1a\u5bfc\u81f4\u51fa\u9519<\/p>\n<p>3\u3001socket\u51fd\u6570<\/p>\n<p>SOCKET <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> af<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>socket \u51fd\u6570\u7528\u4e8e\u521b\u5efa\u4e00\u4e2a\u5957\u63a5\u5b57&#xff08;Socket&#xff09;&#xff0c;\u8fd9\u662f\u7f51\u7edc\u901a\u4fe1\u7684\u8d77\u70b9\u3002\u521b\u5efa\u540e\u8fd4\u56de\u4e00\u4e2a\u5957\u63a5\u5b57\u63cf\u8ff0\u7b26&#xff08;\u4e5f\u5c31\u662f\u4e00\u4e2a\u201c\u53e5\u67c4\u201d&#xff09;&#xff0c;\u7528\u4e8e\u540e\u7eed\u7684\u7ed1\u5b9a\u3001\u76d1\u542c\u3001\u53d1\u9001\u3001\u63a5\u6536\u7b49\u64cd\u4f5c<\/p>\n<p>\u53c2\u6570\u8bf4\u660e&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250426022704-680c44786a600.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u4ee3\u7801\u6848\u4f8b&#xff1a;<\/p>\n<p>SOCKET s <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_STREAM<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u521b\u5efa\u4e00\u4e2aTCP\u5957\u63a5\u5b57<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>s <span class=\"token operator\">&#061;&#061;<\/span> INVALID_SOCKET<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Socket creation failed: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">WSAGetLastError<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>4\u3001closesocket\u51fd\u6570<\/p>\n<p>closesocket\u5173\u95ed\u4e4b\u524d\u6253\u5f00\u7684socket\u5957\u63a5\u5b57\u3002\u5728\u8fdb\u884c\u5173\u95ed\u4e4b\u524d&#xff0c;\u4e00\u822c\u8981\u901a\u8fc7shutdown\u51fd\u6570\u901a\u77e5\u5bf9\u65b9\u81ea\u5df1\u8981\u5173\u95ed\u5957\u63a5\u5b57<\/p>\n<p>5\u3001setsockopt\u51fd\u6570<\/p>\n<p>setsockopt \u662f\u4e00\u4e2a\u7528\u4e8e\u8bbe\u7f6e socket \u53c2\u6570\u9009\u9879\u7684\u51fd\u6570&#xff0c;\u7b80\u5355\u6765\u8bf4&#xff0c;\u5b83\u5c31\u662f\u7528\u6765\u201c\u8c03\u8282\u201d socket \u884c\u4e3a\u7684&#xff0c;\u6bd4\u5982&#xff1a;\u662f\u5426\u5141\u8bb8\u7aef\u53e3\u590d\u7528\u3001\u662f\u5426\u5f00\u542f TCP \u4fdd\u6d3b\u3001\u7f13\u51b2\u533a\u591a\u5927\u7b49<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">setsockopt<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    SOCKET s<span class=\"token punctuation\">,<\/span>           <span class=\"token comment\">\/\/ \u8981\u8bbe\u7f6e\u7684 socket \u63cf\u8ff0\u7b26<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> level<span class=\"token punctuation\">,<\/span>          <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u7684\u534f\u8bae\u7ea7\u522b&#xff08;SOL_SOCKET\/IPPROTO_TCP \u7b49&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> optname<span class=\"token punctuation\">,<\/span>        <span class=\"token comment\">\/\/ \u9009\u9879\u540d&#xff08;SO_REUSEADDR \u7b49&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>optval<span class=\"token punctuation\">,<\/span> <span class=\"token comment\">\/\/ \u9009\u9879\u503c\u7684\u6307\u9488<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> optlen          <span class=\"token comment\">\/\/ \u9009\u9879\u503c\u7684\u957f\u5ea6<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8c03\u7528\u65f6\u673a\u56fe&#xff1a;<\/p>\n<p>\u7a0b\u5e8f\u542f\u52a8<br \/>\n    \u2193<br \/>\n\u521b\u5efa\u5957\u63a5\u5b57&#xff08;socket&#xff09;<br \/>\n    \u2193<br \/>\n \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n \u2502  \u662f\u5426\u9700\u8981\u66f4\u6539socket\u9ed8\u8ba4\u53c2\u6570&#xff1f;       \u2502<br \/>\n \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<br \/>\n        \u2193 \u662f                            \u2193 \u5426<br \/>\n  \u8c03\u7528 setsockopt \u8bbe\u7f6e\u53c2\u6570              \u7ee7\u7eed<br \/>\n        \u2193<br \/>\n  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n  \u2502  \u8bbe\u7f6e\u53c2\u6570\u662f\u5426\u4e0e bind \u9636\u6bb5\u76f8\u5173&#xff1f;     \u2502<br \/>\n  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<br \/>\n        \u2193 \u662f&#xff08;\u5982SO_REUSEADDR&#xff09;<br \/>\n        \u2193<br \/>\n     \u6ce8\u610f\u8c03\u7528\u65f6\u673a&#xff1a;<br \/>\n     \u5fc5\u987b\u5728 bind \u4e4b\u524d\u8bbe\u7f6e<br \/>\n     \u5426\u5219 bind \u53ef\u80fd\u5931\u8d25<br \/>\n        \u2193<br \/>\n\u8c03\u7528 bind \u7ed1\u5b9a\u5730\u5740\u548c\u7aef\u53e3<br \/>\n        \u2193<br \/>\n\u540e\u7eed listen <span class=\"token operator\">\/<\/span> connect \u64cd\u4f5c<\/p>\n<p>\u4ee3\u7801\u6848\u4f8b&#xff1a;\u4f7f\u7528 setsockopt \u8bbe\u7f6e\u7aef\u53e3\u590d\u7528&#xff08;SO_REUSEADDR&#xff09;<\/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;stdio.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;stdlib.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.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;winsock2.h&gt;<\/span>  <span class=\"token comment\">\/\/ Windows \u4e0b socket \u5934\u6587\u4ef6<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">pragma<\/span> <span class=\"token expression\"><span class=\"token function\">comment<\/span><span class=\"token punctuation\">(<\/span>lib<span class=\"token punctuation\">,<\/span> <\/span><span class=\"token string\">&#034;ws2_32.lib&#034;<\/span><span class=\"token expression\"><span class=\"token punctuation\">)<\/span> <\/span><span class=\"token comment\">\/\/ \u94fe\u63a5 ws2_32 \u5e93<\/span><\/span><\/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> <span class=\"token punctuation\">{<\/span><br \/>\n    WSADATA wsaData<span class=\"token punctuation\">;<\/span><br \/>\n    SOCKET listenSocket<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> serverAddr<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> opt <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8981\u8bbe\u7f6e\u7684\u9009\u9879\u503c<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> ret<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521d\u59cb\u5316 Winsock \u5e93<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">WSAStartup<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">MAKEWORD<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>wsaData<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;WSAStartup failed: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">WSAGetLastError<\/span><span class=\"token punctuation\">(<\/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\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efa socket<\/span><br \/>\n    listenSocket <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_STREAM<span class=\"token punctuation\">,<\/span> IPPROTO_TCP<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>listenSocket <span class=\"token operator\">&#061;&#061;<\/span> INVALID_SOCKET<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;socket failed: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">WSAGetLastError<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">WSACleanup<\/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\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8bbe\u7f6e socket \u9009\u9879&#xff1a;\u5141\u8bb8\u5730\u5740\u590d\u7528&#xff08;\u7aef\u53e3\u590d\u7528&#xff09;<\/span><br \/>\n    ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">setsockopt<\/span><span class=\"token punctuation\">(<\/span>listenSocket<span class=\"token punctuation\">,<\/span> SOL_SOCKET<span class=\"token punctuation\">,<\/span> SO_REUSEADDR<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>opt<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>opt<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\">&#061;&#061;<\/span> SOCKET_ERROR<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;setsockopt failed: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">WSAGetLastError<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">closesocket<\/span><span class=\"token punctuation\">(<\/span>listenSocket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">WSACleanup<\/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\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u51c6\u5907\u7ed1\u5b9a\u5730\u5740<\/span><br \/>\n    serverAddr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n    serverAddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htonl<\/span><span class=\"token punctuation\">(<\/span>INADDR_ANY<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7ed1\u5b9a\u672c\u5730\u4efb\u610f IP<\/span><br \/>\n    serverAddr<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">8888<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7ed1\u5b9a\u7aef\u53e3 8888<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7ed1\u5b9a socket<\/span><br \/>\n    ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>listenSocket<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>serverAddr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>serverAddr<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\">&#061;&#061;<\/span> SOCKET_ERROR<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;bind failed: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">WSAGetLastError<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">closesocket<\/span><span class=\"token punctuation\">(<\/span>listenSocket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">WSACleanup<\/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\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5f00\u59cb\u76d1\u542c\u8fde\u63a5<\/span><br \/>\n    ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>listenSocket<span class=\"token punctuation\">,<\/span> SOMAXCONN<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\">&#061;&#061;<\/span> SOCKET_ERROR<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;listen failed: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">WSAGetLastError<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">closesocket<\/span><span class=\"token punctuation\">(<\/span>listenSocket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">WSACleanup<\/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\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Server is listening on port 8888&#8230;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6e05\u7406\u8d44\u6e90&#xff08;\u8fd9\u91cc\u53ea\u662f\u7b80\u5355\u793a\u4f8b&#xff0c;\u5b9e\u9645\u5e94\u52a0\u5165 accept \u5904\u7406\u903b\u8f91&#xff09;<\/span><br \/>\n    <span class=\"token function\">closesocket<\/span><span class=\"token punctuation\">(<\/span>listenSocket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">WSACleanup<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <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>6\u3001select\u51fd\u6570<\/p>\n<p>select \u7528\u6765\u68c0\u6d4b\u4e00\u7ec4 socket \u662f\u5426\u5c31\u7eea&#xff08;\u53ef\u8bfb\u3001\u53ef\u5199\u6216\u5f02\u5e38&#xff09;&#xff0c;\u4ece\u800c\u907f\u514d\u963b\u585e\u6216\u8f6e\u8be2\u6240\u6709 socket&#xff0c;\u63d0\u9ad8\u7a0b\u5e8f\u6548\u7387<\/p>\n<p>\u6bd4\u5982&#xff0c;\u4f60\u5199\u4e86\u4e2a\u670d\u52a1\u5668&#xff0c;\u8981\u540c\u65f6\u76d1\u542c100\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5&#xff0c;\u4f46\u4f60\u53c8\u4e0d\u60f3\u4e00\u4e2a\u4e2a\u8f6e\u8be2\u95ee&#xff1a;\u201c\u6709\u6570\u636e\u5417&#xff1f;\u201d&#xff0c;\u8fd9\u4e2a\u65f6\u5019\u5c31\u7528 select \u8ba9\u7cfb\u7edf\u5e2e\u4f60\u76d1\u89c6&#xff0c;\u54ea\u4e2a socket \u6709\u4e8b\u53d1\u751f&#xff08;\u6709\u6570\u636e\u53ef\u8bfb&#xff09;&#xff0c;\u5c31\u53bb\u5904\u7406\u5b83<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">select<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> nfds<span class=\"token punctuation\">,<\/span>               <span class=\"token comment\">\/\/ Linux \u4e2d\u4f7f\u7528&#xff1b;Windows \u5ffd\u7565<\/span><br \/>\n    fd_set <span class=\"token operator\">*<\/span>readfds<span class=\"token punctuation\">,<\/span>        <span class=\"token comment\">\/\/ \u53ef\u8bfb socket \u96c6\u5408<\/span><br \/>\n    fd_set <span class=\"token operator\">*<\/span>writefds<span class=\"token punctuation\">,<\/span>       <span class=\"token comment\">\/\/ \u53ef\u5199 socket \u96c6\u5408<\/span><br \/>\n    fd_set <span class=\"token operator\">*<\/span>exceptfds<span class=\"token punctuation\">,<\/span>      <span class=\"token comment\">\/\/ \u5f02\u5e38 socket \u96c6\u5408<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">timeval<\/span> <span class=\"token operator\">*<\/span>timeout <span class=\"token comment\">\/\/ \u8d85\u65f6\u7b49\u5f85\u65f6\u95f4<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53c2\u6570\u89e3\u91ca&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250426022704-680c4478b4a9f.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u4ee3\u7801\u6848\u4f8b&#xff0c;\u4f7f\u7528 select \u7b49\u5f85 socket \u53ef\u8bfb&#xff1a;<\/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;stdio.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;winsock2.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">pragma<\/span> <span class=\"token expression\"><span class=\"token function\">comment<\/span><span class=\"token punctuation\">(<\/span>lib<span class=\"token punctuation\">,<\/span> <\/span><span class=\"token string\">&#034;ws2_32.lib&#034;<\/span><span class=\"token expression\"><span class=\"token punctuation\">)<\/span><\/span><\/span><\/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> <span class=\"token punctuation\">{<\/span><br \/>\n    WSADATA wsaData<span class=\"token punctuation\">;<\/span><br \/>\n    SOCKET sock<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> server<span class=\"token punctuation\">;<\/span><br \/>\n    fd_set readfds<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">timeval<\/span> timeout<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> ret<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">WSAStartup<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">MAKEWORD<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>wsaData<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    sock <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_STREAM<span class=\"token punctuation\">,<\/span> IPPROTO_TCP<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    server<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n    server<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">80<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    server<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><span class=\"token string\">&#034;93.184.216.34&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ example.com<\/span><\/p>\n<p>    <span class=\"token function\">connect<\/span><span class=\"token punctuation\">(<\/span>sock<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>server<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>server<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521d\u59cb\u5316 fd_set<\/span><br \/>\n    <span class=\"token function\">FD_ZERO<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>readfds<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">FD_SET<\/span><span class=\"token punctuation\">(<\/span>sock<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>readfds<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u8d85\u65f6\u65f6\u95f4\u4e3a5\u79d2<\/span><br \/>\n    timeout<span class=\"token punctuation\">.<\/span>tv_sec <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    timeout<span class=\"token punctuation\">.<\/span>tv_usec <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">select<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>readfds<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>timeout<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Timeout, no data received.\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <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> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;select error: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">WSAGetLastError<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">FD_ISSET<\/span><span class=\"token punctuation\">(<\/span>sock<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>readfds<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Data is available to read.\\\\n&#034;<\/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><\/p>\n<p>    <span class=\"token function\">closesocket<\/span><span class=\"token punctuation\">(<\/span>sock<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">WSACleanup<\/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>7\u3001bind\u51fd\u6570<\/p>\n<p>bind \u51fd\u6570\u7684\u4f5c\u7528\u662f\u5c06 socket \u4e0e\u672c\u5730\u7684 IP \u5730\u5740\u548c\u7aef\u53e3\u53f7\u7ed1\u5b9a\u8d77\u6765&#xff0c;\u8fd9\u6837\u7cfb\u7edf\u624d\u77e5\u9053\u8fd9\u4e2a socket \u662f\u7528\u54ea\u4e2a\u672c\u5730\u5730\u5740\u548c\u7aef\u53e3\u901a\u4fe1\u7684\u3002\u8be5\u51fd\u6570\u65e2\u53ef\u7528\u4e8e\u9762\u5411\u8fde\u63a5\u7684TCP\u901a\u4fe1\u4e2d&#xff0c;\u4e5f\u53ef\u4ee5\u7528\u4e8e\u9762\u5411\u975e\u8fde\u63a5\u7684UDP\u901a\u4fe1\u4e2d<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    SOCKET s<span class=\"token punctuation\">,<\/span>                      <span class=\"token comment\">\/\/ \u5df2\u521b\u5efa\u7684 socket \u63cf\u8ff0\u7b26<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token operator\">*<\/span>name<span class=\"token punctuation\">,<\/span>  <span class=\"token comment\">\/\/ \u7ed1\u5b9a\u7684\u5730\u5740\u4fe1\u606f<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> namelen                   <span class=\"token comment\">\/\/ \u5730\u5740\u7ed3\u6784\u957f\u5ea6<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6848\u4f8b&#xff1a;<\/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;stdio.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;winsock2.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">pragma<\/span> <span class=\"token expression\"><span class=\"token function\">comment<\/span><span class=\"token punctuation\">(<\/span>lib<span class=\"token punctuation\">,<\/span> <\/span><span class=\"token string\">&#034;ws2_32.lib&#034;<\/span><span class=\"token expression\"><span class=\"token punctuation\">)<\/span> <\/span><span class=\"token comment\">\/\/ \u94fe\u63a5 Winsock \u5e93<\/span><\/span><\/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> <span class=\"token punctuation\">{<\/span><br \/>\n    WSADATA wsaData<span class=\"token punctuation\">;<\/span><br \/>\n    SOCKET serverSocket<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> serverAddr<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521d\u59cb\u5316 Winsock<\/span><br \/>\n    <span class=\"token function\">WSAStartup<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">MAKEWORD<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>wsaData<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efa TCP socket<\/span><br \/>\n    serverSocket <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_STREAM<span class=\"token punctuation\">,<\/span> IPPROTO_TCP<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>serverSocket <span class=\"token operator\">&#061;&#061;<\/span> INVALID_SOCKET<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Socket creation failed: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">WSAGetLastError<\/span><span class=\"token punctuation\">(<\/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\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u5730\u5740\u4fe1\u606f<\/span><br \/>\n    serverAddr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n    serverAddr<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\">\/\/ \u76d1\u542c\u6240\u6709\u672c\u5730 IP<\/span><br \/>\n    serverAddr<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">8080<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ \u76d1\u542c\u7aef\u53e3 8080<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7ed1\u5b9a socket \u548c\u5730\u5740<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>serverSocket<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>serverAddr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>serverAddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> SOCKET_ERROR<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Bind failed: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">WSAGetLastError<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">closesocket<\/span><span class=\"token punctuation\">(<\/span>serverSocket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">WSACleanup<\/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\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Bind successful on port 8080.\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5f00\u59cb\u76d1\u542c\u8fde\u63a5<\/span><br \/>\n    <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>serverSocket<span class=\"token punctuation\">,<\/span> SOMAXCONN<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Listening&#8230;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">WSACleanup<\/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>8\u3001listen\u51fd\u6570<\/p>\n<p>listen\u51fd\u6570\u4f7f\u7528socket\u72b6\u6001\u76d1\u542c\u72b6\u6001&#xff0c;\u5e76\u7b49\u5f85\u5176\u4ed6socket\u7684\u8fde\u63a5\u3002\u8be5\u51fd\u6570\u4ec5\u7528\u4e8e\u9762\u5411\u8fde\u63a5\u7684TCP\u901a\u4fe1\u4e2d&#xff0c;UDP\u901a\u4fe1\u662f\u4e0d\u9700\u8981listen\u51fd\u6570\u7684<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>SOCKET s<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> backlog<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53c2\u6570\u89e3\u91ca&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250426022705-680c44790592c.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>9\u3001accept\u51fd\u6570<\/p>\n<p>accept\u51fd\u6570\u5141\u8bb8\u548c\u63a5\u6536\u4e00\u4e2a\u8fdc\u7aef\u7684\u8fde\u63a5&#xff0c;\u8be5\u51fd\u6570\u4ec5\u7528\u4e8e\u9762\u5411\u8fde\u63a5\u7684TCP\u901a\u4fe1\u4e2d&#xff0c;\u5e76\u4e14\u53ea\u7528\u4e8e\u670d\u52a1\u5668\u7aef&#xff0c;\u7528\u4e8e\u63a5\u6536\u5ba2\u6237\u7aef\u901a\u8fc7connect\u51fd\u6570\u53d1\u6765\u7684\u8fde\u63a5\u7533\u8bf7&#xff1b;\u9762\u5411\u975e\u8fde\u63a5\u7684UDP\u901a\u4fe1\u662f\u4e0d\u9700\u8981\u5904\u7406\u6b64\u51fd\u6570\u7684<\/p>\n<p>\u53ef\u4ee5\u628a listen \u6bd4\u55bb\u6210\u201c\u95e8\u536b\u51c6\u5907\u597d\u4e86\u201d&#xff0c;\u800c accept \u5c31\u662f\u201c\u6253\u5f00\u95e8\u8fce\u5ba2\u201d\u90a3\u4e00\u523b<\/p>\n<p>SOCKET <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>SOCKET s<span class=\"token punctuation\">,<\/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> <span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>addrlen<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53c2\u6570\u89e3\u91ca&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250426022705-680c44793ee91.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u8be5\u51fd\u6570\u770b\u4f3c\u7b80\u5355&#xff0c;\u5176\u5b9e\u6bd4\u8f83\u590d\u6742&#xff0c;\u4e5f\u662f\u591a\u7ebf\u7a0b\u5904\u7406\u6548\u679c\u7684\u5173\u952e&#xff0c;\u9996\u5148\u8c03\u7528\u6b64\u51fd\u6570\u4e4b\u524d&#xff0c;\u5e94\u8be5\u5df2\u6210\u529f\u5730\u8c03\u7528\u4e86listen\u51fd\u6570\u3002\u7136\u540e\u5728\u8c03\u7528\u8be5\u51fd\u6570\u65f6&#xff0c;\u5982\u679c\u8c03\u7528\u6210\u529f&#xff0c;\u5219\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684socket&#xff0c;\u6240\u4ee5\u5982\u679c\u540e\u9762\u670d\u52a1\u7aef\u7684\u5904\u7406\u5f88\u7b80\u5355&#xff0c;\u53ef\u4ee5\u5728\u5f53\u524d\u7ebf\u7a0b\u4e2d\u7528\u8fd9\u4e2a\u65b0\u521b\u5efa\u7684socket\u8fdb\u884c\u5904\u7406&#xff0c;\u4fd7\u79f0\u201c\u77ed\u8fde\u63a5\u201d\u200b&#xff1b;<\/p>\n<p>\u5982\u679c\u5904\u7406\u5f88\u590d\u6742&#xff0c;\u5e76\u4e14\u4ecd\u5728\u5f53\u524d\u7ebf\u7a0b\u4e2d\u5904\u7406&#xff0c;\u5219\u4f1a\u5f71\u54cd\u5230accept\u51fd\u6570\u5bf9\u5176\u4ed6\u7ebf\u7a0b\u901a\u8fc7connect\u8fdb\u884c\u8fde\u63a5&#xff0c;\u6b64\u65f6\u5c31\u9700\u8981\u518d\u521b\u5efa\u4e00\u4e2a\u7ebf\u7a0b&#xff0c;\u7531\u65b0\u5efa\u7684\u7ebf\u7a0b&#xff0c;\u5e76\u4f7f\u7528\u8fd4\u56de\u7684\u4e00\u4e2asocket\u4e13\u95e8\u5904\u7406\u6b64\u6b21\u8fde\u63a5\u540e\u7684\u5404\u9879\u64cd\u4f5c&#xff0c;\u4fd7\u79f0\u201c\u957f\u8fde\u63a5\u201d\u200b<\/p>\n<p>\u4ee3\u7801\u6848\u4f8b&#xff1a;TCP\u670d\u52a1\u7aef<\/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;stdio.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;winsock2.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">pragma<\/span> <span class=\"token expression\"><span class=\"token function\">comment<\/span><span class=\"token punctuation\">(<\/span>lib<span class=\"token punctuation\">,<\/span> <\/span><span class=\"token string\">&#034;ws2_32.lib&#034;<\/span><span class=\"token expression\"><span class=\"token punctuation\">)<\/span><\/span><\/span><\/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> <span class=\"token punctuation\">{<\/span><br \/>\n    WSADATA wsaData<span class=\"token punctuation\">;<\/span><br \/>\n    SOCKET listenSocket<span class=\"token punctuation\">,<\/span> clientSocket<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> serverAddr<span class=\"token punctuation\">,<\/span> clientAddr<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> clientAddrLen <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>clientAddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">WSAStartup<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">MAKEWORD<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>wsaData<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efa TCP socket<\/span><br \/>\n    listenSocket <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_STREAM<span class=\"token punctuation\">,<\/span> IPPROTO_TCP<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7ed1\u5b9a IP &#043; \u7aef\u53e3<\/span><br \/>\n    serverAddr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n    serverAddr<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><br \/>\n    serverAddr<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">8080<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>listenSocket<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span>SOCKADDR<span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>serverAddr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>serverAddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u542f\u52a8\u76d1\u542c<\/span><br \/>\n    <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>listenSocket<span class=\"token punctuation\">,<\/span> SOMAXCONN<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Server is listening on port 8080&#8230;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u63a5\u53d7\u5ba2\u6237\u7aef\u8fde\u63a5&#xff08;\u963b\u585e&#xff09;<\/span><br \/>\n    clientSocket <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>listenSocket<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span>SOCKADDR<span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>clientAddr<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>clientAddrLen<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>clientSocket <span class=\"token operator\">&#061;&#061;<\/span> INVALID_SOCKET<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Accept failed: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">WSAGetLastError<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">closesocket<\/span><span class=\"token punctuation\">(<\/span>listenSocket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">WSACleanup<\/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\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Accepted a connection from %s:%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token function\">inet_ntoa<\/span><span class=\"token punctuation\">(<\/span>clientAddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token function\">ntohs<\/span><span class=\"token punctuation\">(<\/span>clientAddr<span class=\"token punctuation\">.<\/span>sin_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u53d1\u9001\u6b22\u8fce\u6d88\u606f<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> welcomeMsg <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;Hello, client!\\\\n&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span>clientSocket<span class=\"token punctuation\">,<\/span> welcomeMsg<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>welcomeMsg<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><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5173\u95ed\u8fde\u63a5<\/span><br \/>\n    <span class=\"token function\">closesocket<\/span><span class=\"token punctuation\">(<\/span>clientSocket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">closesocket<\/span><span class=\"token punctuation\">(<\/span>listenSocket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">WSACleanup<\/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>10\u3001connect\u51fd\u6570<\/p>\n<p>\u5728\u626b\u63cf\u5668\u7684\u5e94\u7528\u4e2d&#xff0c;connect\u662f\u4e00\u79cd\u7b80\u5355\u800c\u6709\u6548\u7684\u8fde\u63a5\u65b9\u5f0f&#xff0c;\u8fde\u63a5\u6210\u529f&#xff0c;\u5219\u53ef\u4ee5\u8ba4\u4e3a\u5bf9\u65b9\u7684\u7aef\u53e3\u662f\u6253\u5f00\u7684\u3002\u8be5\u51fd\u6570\u4ec5\u7528\u4e8e\u9762\u5411\u8fde\u63a5\u7684TCP\u901a\u4fe1\u4e2d&#xff0c;\u5e76\u4e14\u53ea\u7528\u4e8e\u670d\u52a1\u5668\u7aef&#xff0c;\u7528\u6765\u63a5\u6536\u5ba2\u6237\u7aef\u901a\u8fc7connect\u51fd\u6570\u53d1\u6765\u7684\u8fde\u63a5\u7533\u8bf7&#xff1b;\u9762\u5411\u975e\u8fde\u63a5\u7684UDP\u901a\u8fc7\u662f\u4e0d\u9700\u8981\u5904\u7406\u6b64\u51fd\u6570\u7684<\/p>\n<p>11\u3001send\u51fd\u6570<\/p>\n<p>send\u51fd\u6570\u53d1\u9001\u6570\u636e\u5230\u5df2\u5efa\u7acb\u8fde\u63a5\u7684socket\u4e0a&#xff0c;\u8be5\u51fd\u6570\u65e2\u53ef\u4ee5\u7528\u4e8e\u670d\u52a1\u5668\u7aef&#xff0c;\u4e5f\u53ef\u4ee5\u7528\u4e8e\u5ba2\u6237\u7aef&#xff0c;\u4f46\u53cc\u65b9\u90fd\u5fc5\u987b\u662f\u91c7\u7528TCP\u8fde\u63a5<\/p>\n<p>12\u3001recv\u51fd\u6570<\/p>\n<p>recv\u51fd\u6570\u7528\u4e8e\u63a5\u6536\u4ece\u5df2\u5efa\u7acb\u8fde\u63a5\u7684socket\u4e0a\u7684\u6570\u636e&#xff0c;\u8be5\u51fd\u6570\u65e2\u53ef\u4ee5\u7528\u4e8e\u670d\u52a1\u5668\u7aef&#xff0c;\u4e5f\u53ef\u4ee5\u7528\u4e8e\u5ba2\u6237\u7aef&#xff0c;\u4f46\u53cc\u65b9\u90fd\u5fc5\u987b\u662f\u91c7\u7528TCP\u8fde\u63a5\u3002<\/p>\n<p>13\u3001shutdown\u51fd\u6570<\/p>\n<p>shutdown \u51fd\u6570\u7528\u4e8e\u5173\u95ed\u67d0\u4e2a\u65b9\u5411\u4e0a\u7684\u6570\u636e\u4f20\u8f93\u901a\u9053&#xff1a;\u53ea\u6536\u3001\u4e0d\u6536\u3001\u53ea\u53d1\u3001\u4e0d\u53d1&#xff0c;\u6216\u8005\u4e24\u4e2a\u65b9\u5411\u90fd\u5173\u3002\u66f4\u4f18\u96c5\u3001\u660e\u786e\u5730\u901a\u77e5\u5bf9\u65b9\u201c\u6211\u4e0d\u60f3\u518d\u53d1\/\u6536\u6570\u636e\u4e86\u201d&#xff0c;\u907f\u514d\u8fde\u63a5\u72b6\u6001\u6df7\u4e71<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">shutdown<\/span><span class=\"token punctuation\">(<\/span>SOCKET s<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> how<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53c2\u6570\u8bf4\u660e&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250426022705-680c447986475.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>how \u53c2\u6570\u7684\u53d6\u503c&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250426022705-680c4479b3562.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u5982\u679c\u76f4\u63a5\u8c03\u7528 closesocket(s) \u800c\u4e0d shutdown&#xff1a;<\/p>\n<ul>\n<li>\u5bf9\u65b9\u53ef\u80fd\u8fd8\u5728\u5199\u5165\u4f60\u7684 socket&#xff0c;\u4f46\u4f60\u8fd9\u8fb9\u5df2\u7ecf\u5173\u6389\u4e86&#xff0c;\u6570\u636e\u5c31\u4e22\u4e86&#xff1b;<\/li>\n<li>\u6ca1\u6709\u7ed9 TCP \u534f\u8bae\u4e00\u4e2a\u201c\u56db\u6b21\u6325\u624b\u201d \u7684\u673a\u4f1a&#xff0c;\u53ef\u80fd\u9020\u6210\u8d44\u6e90\u60ac\u6302&#xff08;TIME_WAIT \u72b6\u6001\u4e0d\u4e00\u81f4&#xff09;&#xff1b;<\/li>\n<\/ul>\n<p>\u6b63\u786e\u5173\u95ed\u6d41\u7a0b\u5e94\u8be5\u662f&#xff1a;<\/p>\n<p><span class=\"token function\">shutdown<\/span><span class=\"token punctuation\">(<\/span>socket<span class=\"token punctuation\">,<\/span> SD_SEND<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u53d1\u9001\u7ed3\u675f&#xff0c;\u901a\u77e5\u5bf9\u65b9<\/span><br \/>\n<span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>                  <span class=\"token comment\">\/\/ \u7b49\u5bf9\u65b9\u628a\u5269\u4e0b\u8981\u8bf4\u7684\u8bf4\u5b8c<\/span><br \/>\n<span class=\"token function\">closesocket<\/span><span class=\"token punctuation\">(<\/span>socket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/ \u6700\u540e\u5173\u95ed 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