{"id":82648,"date":"2026-07-25T10:57:40","date_gmt":"2026-07-25T02:57:40","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/82648.html"},"modified":"2026-07-25T10:57:40","modified_gmt":"2026-07-25T02:57:40","slug":"%e3%80%90linux%e4%b9%8b%e6%97%85%e3%80%91linux-udp-socket-%e7%bc%96%e7%a8%8b%e5%ae%9e%e6%88%98%ef%bc%9a%e4%bb%8e-echo-%e6%9c%8d%e5%8a%a1%e5%99%a8%e5%88%b0%e5%a4%9a%e7%ba%bf%e7%a8%8b%e8%81%8a%e5%a4%a9","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/82648.html","title":{"rendered":"\u3010Linux\u4e4b\u65c5\u3011Linux UDP Socket \u7f16\u7a0b\u5b9e\u6218\uff1a\u4ece Echo \u670d\u52a1\u5668\u5230\u591a\u7ebf\u7a0b\u804a\u5929\u5ba4"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260725025736-6a642620577ff.png\" alt=\"QQ20260622-233337\" \/> <\/p>\n<h4><font color=\"red\">\u8bf7\u541b\u6d4f\u89c8<\/font><\/h4>\n<ul>\n<li>\n<ul>\n<li>\u524d\u8a00<\/li>\n<li>\u4e00\u3001UDP \u7f16\u7a0b\u6a21\u578b\u6982\u8ff0<\/li>\n<li>\u4e8c\u3001V1&#xff1a;UDP Echo \u670d\u52a1\u5668<\/li>\n<li>\n<ul>\n<li>2.1 nocopy \u5de5\u5177\u7c7b<\/li>\n<li>2.2 InetAddr \u5730\u5740\u4fe1\u606f\u5c01\u88c5<\/li>\n<li>2.3 \u9519\u8bef\u7801\u679a\u4e3e<\/li>\n<li>2.4 UdpServer \u6838\u5fc3\u5b9e\u73b0<\/li>\n<li>2.5 \u670d\u52a1\u7aef\u5165\u53e3 Main.cpp<\/li>\n<li>2.6 UdpClient \u5b9e\u73b0\u4e0e bind \u95ee\u9898<\/li>\n<\/ul>\n<\/li>\n<li>\u4e09\u3001V2&#xff1a;UDP \u5b57\u5178\u670d\u52a1\u5668<\/li>\n<li>\n<ul>\n<li>3.1 Dict \u5b57\u5178\u52a0\u8f7d<\/li>\n<li>3.2 UdpServer \u91cd\u6784\u2014\u2014\u56de\u8c03\u5206\u79bb\u4e1a\u52a1<\/li>\n<li>3.3 Main \u6574\u5408<\/li>\n<li>3.4 \u5c01\u88c5\u7248 UdpSocket&#xff08;\u8865\u5145\u53c2\u8003&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>\u56db\u3001V3&#xff1a;UDP \u591a\u7ebf\u7a0b\u804a\u5929\u5ba4<\/li>\n<li>\n<ul>\n<li>4.1 \u67b6\u6784\u5347\u7ea7&#xff1a;\u5f15\u5165\u7ebf\u7a0b\u6c60<\/li>\n<li>4.2 \u5728\u7ebf\u7528\u6237\u7ba1\u7406<\/li>\n<li>4.3 \u6d88\u606f\u5e7f\u64ad Route<\/li>\n<li>4.4 \u591a\u7ebf\u7a0b\u5ba2\u6237\u7aef<\/li>\n<\/ul>\n<\/li>\n<li>\u4e94\u3001\u8865\u5145&#xff1a;\u5730\u5740\u8f6c\u6362\u51fd\u6570<\/li>\n<li>\n<ul>\n<li>5.1 \u51fd\u6570\u5bf9\u6bd4<\/li>\n<li>5.2 inet_ntoa \u7684\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898<\/li>\n<\/ul>\n<\/li>\n<li>\u516d\u3001\u5e38\u89c1\u95ee\u9898\u4e0e\u907f\u5751\u6307\u5357<\/li>\n<li>\n<ul>\n<li>6.1 \u5fd8\u8bb0 htons() \u5bfc\u81f4\u7aef\u53e3\u53f7\u9519\u4e71<\/li>\n<li>6.2 recvfrom \u7684 addrlen \u53c2\u6570\u672a\u521d\u59cb\u5316<\/li>\n<li>6.3 \u5ba2\u6237\u7aef bind \u4e86\u56fa\u5b9a\u7aef\u53e3\u5bfc\u81f4\u591a\u5b9e\u4f8b\u51b2\u7a81<\/li>\n<li>6.4 inet_ntoa \u591a\u7ebf\u7a0b\u4e0b\u8fd4\u56de\u9519\u8bef IP<\/li>\n<li>6.5 sendto \u8fd4\u56de -1 \u4f46\u4e0d\u4ee3\u8868\u5bf9\u65b9\u6ca1\u6536\u5230<\/li>\n<\/ul>\n<\/li>\n<li>\u516d\u3001UDP \u670d\u52a1\u5668\u751f\u4ea7\u90e8\u7f72\u6ce8\u610f\u4e8b\u9879<\/li>\n<li>\n<ul>\n<li>6.1 \u53d1\u9001\u901f\u7387\u63a7\u5236\u2014\u2014\u907f\u514d&#034;\u6d2a\u6cdb&#034;\u4e22\u5305<\/li>\n<li>6.2 \u91cd\u4f20\u548c\u8d85\u65f6\u5904\u7406\u2014\u2014\u5e94\u7528\u5c42\u7684\u53ef\u9760\u6027\u8865\u507f<\/li>\n<li>6.3 \u8d1f\u8f7d\u5747\u8861\u2014\u2014\u591a\u8fdb\u7a0b bind \u540c\u4e00\u7aef\u53e3<\/li>\n<li>6.4 \u76d1\u63a7\u6307\u6807\u2014\u2014\u54ea\u4e9b\u6570\u636e\u5e94\u8be5\u8bb0\u5f55<\/li>\n<\/ul>\n<\/li>\n<li>\u603b\u7ed3<\/li>\n<li>\n<ul>\n<li>\u52a8\u624b\u8bd5\u8bd5<\/li>\n<\/ul>\n<\/li>\n<li>\u5c3e\u58f0<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>\u524d\u8a00<\/h3>\n<p>\u56de\u987e&#xff1a;Linux \u7f51\u7edc\u57fa\u7840\u5168\u89e3\u6790&#xff1a;\u4ece\u534f\u8bae\u5206\u5c42\u5230 Socket \u7f16\u7a0b<\/p>\n<p>\u5728\u4e0a\u4e00\u7bc7\u7f51\u7edc\u57fa\u7840\u6982\u5ff5\u4e2d&#xff0c;\u6211\u4eec\u7406\u6e05\u4e86\u534f\u8bae\u5206\u5c42\u3001IP\/MAC \u5206\u5de5\u3001\u7aef\u53e3\u53f7\u548c Socket \u7684\u57fa\u672c\u6982\u5ff5\u3002\u672c\u7bc7\u6b63\u5f0f\u8fdb\u5165 Socket \u7f16\u7a0b\u5b9e\u6218&#xff0c;\u9009\u62e9\u4ece UDP \u534f\u8bae\u5207\u5165\u2014\u2014\u5b83\u6bd4 TCP \u7b80\u5355\u5f97\u591a&#xff1a;\u65e0\u9700\u8fde\u63a5\u3001\u65e0\u9700\u63e1\u624b\u3001\u76f4\u53d1\u76f4\u6536\u3002\u5148\u638c\u63e1 UDP \u7684\u7f16\u7a0b\u6a21\u578b&#xff0c;\u540e\u7eed\u518d\u5b66 TCP \u65f6\u4f1a\u53d1\u73b0\u5f88\u591a\u63a5\u53e3\u662f\u5171\u901a\u7684&#xff0c;\u53ea\u662f TCP \u591a\u4e86&#034;\u8fde\u63a5\u7ba1\u7406&#034;\u8fd9\u4e00\u5c42\u590d\u6742\u5ea6\u3002<\/p>\n<p>\u672c\u6587\u91c7\u7528\u6e10\u8fdb\u5f0f\u7248\u672c\u8fed\u4ee3\u7684\u65b9\u5f0f&#xff1a;V1 \u5b9e\u73b0\u6700\u7b80\u5355\u7684 Echo \u670d\u52a1\u5668 \u2192 V2 \u91cd\u6784\u4e3a\u82f1\u8bd1\u6c49\u5b57\u5178\u670d\u52a1\u5668&#xff0c;\u5206\u79bb\u4e1a\u52a1\u903b\u8f91 \u2192 V3 \u5f15\u5165\u7ebf\u7a0b\u6c60&#xff0c;\u5347\u7ea7\u4e3a\u591a\u7ebf\u7a0b\u804a\u5929\u5ba4\u3002\u6bcf\u4e2a\u7248\u672c\u90fd\u6709\u5b8c\u6574\u4ee3\u7801\u548c\u8bbe\u8ba1\u601d\u8def\u5206\u6790&#xff0c;\u6700\u540e\u8865\u5145\u5730\u5740\u8f6c\u6362\u51fd\u6570\u4e0e inet_ntoa \u7684\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u3002\u8bfb\u5b8c\u672c\u6587&#xff0c;\u4f60\u5c06\u80fd\u591f\u72ec\u7acb\u5b9e\u73b0\u4e00\u4e2a\u57fa\u4e8e UDP \u7684\u591a\u7ebf\u7a0b\u804a\u5929\u5ba4&#xff0c;\u5e76\u7406\u89e3\u6bcf\u4e00\u884c\u4ee3\u7801\u80cc\u540e\u7684\u8bbe\u8ba1\u51b3\u7b56\u3002<\/p>\n<h3>\u4e00\u3001UDP \u7f16\u7a0b\u6a21\u578b\u6982\u8ff0<\/h3>\n<p>UDP&#xff08;User Datagram Protocol&#xff09;\u7684\u7f16\u7a0b\u6a21\u578b\u53ef\u4ee5\u6982\u62ec\u4e3a\u4e09\u6b65&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260725025737-6a642621e9847.png\" alt=\"QQ20260513-115957\" \/><\/p>\n<table>\n<tr>\u6b65\u9aa4\u670d\u52a1\u7aef\u5ba2\u6237\u7aef<\/tr>\n<tbody>\n<tr>\n<td>1<\/td>\n<td>socket() \u521b\u5efa\u5957\u63a5\u5b57<\/td>\n<td>socket() \u521b\u5efa\u5957\u63a5\u5b57<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>bind() \u7ed1\u5b9a\u77e5\u540d\u7aef\u53e3<\/td>\n<td>\u4e0d\u663e\u5f0f bind&#xff08;OS \u81ea\u52a8\u5206\u914d&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>recvfrom() \/ sendto() \u6536\u53d1<\/td>\n<td>sendto() \/ recvfrom() \u6536\u53d1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6838\u5fc3\u63a5\u53e3\u53ea\u6709\u4e24\u4e2a\u2014\u2014sendto() \u548c recvfrom()\u3002UDP \u662f\u65e0\u8fde\u63a5\u7684&#xff0c;\u6bcf\u6b21\u53d1\u9001\u90fd\u8981\u5e26\u4e0a\u76ee\u6807\u5730\u5740&#xff0c;\u6bcf\u6b21\u63a5\u6536\u90fd\u8981\u8f93\u51fa\u5bf9\u65b9\u5730\u5740&#xff08;\u4e3a\u56de\u590d\u505a\u51c6\u5907&#xff09;\u3002<\/p>\n<p>UDP \u7f16\u7a0b\u672c\u8d28\u4e0a\u5c31\u662f\u4e00\u4e2a&#034;\u6536\u53d1\u6d88\u606f&#034;\u7684\u5faa\u73af&#xff1a;\u6536\u4e00\u4e2a\u5305&#xff0c;\u5904\u7406&#xff0c;\u56de\u590d&#xff08;\u5982\u679c\u9700\u8981&#xff09;\u3002\u4e0d\u50cf TCP \u9700\u8981 listen\/accept\/connect&#xff0c;UDP \u7684\u4ee3\u7801\u7ed3\u6784\u8981\u7b80\u5355\u5f97\u591a\u3002<\/p>\n<h3>\u4e8c\u3001V1&#xff1a;UDP Echo \u670d\u52a1\u5668<\/h3>\n<p>\u5148\u4ece\u6700\u7b80\u5355\u7684 Echo&#xff08;\u56de\u663e&#xff09;\u670d\u52a1\u5668\u5f00\u59cb\u2014\u2014\u6536\u5230\u4ec0\u4e48\u5c31\u56de\u4ec0\u4e48\u3002\u9ebb\u96c0\u867d\u5c0f&#xff0c;\u4e94\u810f\u4ff1\u5168\u3002<\/p>\n<h4>2.1 nocopy \u5de5\u5177\u7c7b<\/h4>\n<p>\u5148\u5199\u4e00\u4e2a\u7981\u6b62\u62f7\u8d1d\u7684\u57fa\u7c7b&#xff0c;\u540e\u7eed\u670d\u52a1\u5668\u7c7b\u90fd\u7ee7\u627f\u5b83&#xff0c;\u907f\u514d socket fd \u88ab\u610f\u5916\u62f7\u8d1d\u5bfc\u81f4 double close&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ nocopy.hpp<\/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\">once<\/span><\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">nocopy<\/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\">nocopy<\/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\">nocopy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> nocopy <span class=\"token operator\">&amp;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">delete<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> nocopy<span class=\"token operator\">&amp;<\/span> <span class=\"token keyword\">operator<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> nocopy <span class=\"token operator\">&amp;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">delete<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token operator\">~<\/span><span class=\"token function\">nocopy<\/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 punctuation\">;<\/span><\/p>\n<h4>2.2 InetAddr \u5730\u5740\u4fe1\u606f\u5c01\u88c5<\/h4>\n<p>struct sockaddr_in \u662f C \u98ce\u683c\u7ed3\u6784\u4f53&#xff0c;\u53d6 IP \u548c\u7aef\u53e3\u65f6\u9700\u8981\u8c03\u7528 inet_ntoa \/ ntohs\u3002\u5c01\u88c5\u4e00\u4e2a InetAddr \u7c7b\u7b80\u5316\u64cd\u4f5c&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ InetAddr.hpp<\/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\">once<\/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;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;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;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;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;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;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\">InetAddr<\/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\">\/\/ \u6784\u9020\u51fd\u6570 1&#xff1a;\u4ece sockaddr_in \u89e3\u6790&#xff08;recvfrom \u540e\u7528&#xff09;<\/span><br \/>\n    <span class=\"token function\">InetAddr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> <span class=\"token operator\">&amp;<\/span>addr<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span> <span class=\"token function\">_addr<\/span><span class=\"token punctuation\">(<\/span>addr<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        _port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">ntohs<\/span><span class=\"token punctuation\">(<\/span>_addr<span class=\"token punctuation\">.<\/span>sin_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">char<\/span> buf<span class=\"token punctuation\">[<\/span>INET_ADDRSTRLEN<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        _ip <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">inet_ntop<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>_addr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buf<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>    <span class=\"token comment\">\/\/ \u6784\u9020\u51fd\u6570 2&#xff1a;\u4ece IP &#043; \u7aef\u53e3\u6784\u9020&#xff08;bind \/ sendto \u524d\u7528&#xff09;<\/span><br \/>\n    <span class=\"token function\">InetAddr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string <span class=\"token operator\">&amp;<\/span>ip<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">uint16_t<\/span> port<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span> <span class=\"token function\">_ip<\/span><span class=\"token punctuation\">(<\/span>ip<span class=\"token punctuation\">)<\/span><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><br \/>\n        <span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>_addr<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        _addr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n        _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>_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">inet_pton<\/span><span class=\"token punctuation\">(<\/span>AF_INET<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 operator\">&amp;<\/span>_addr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    std<span class=\"token double-colon punctuation\">::<\/span>string <span class=\"token function\">Ip<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> _ip<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> <span class=\"token function\">Port<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> _port<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> <span class=\"token operator\">&amp;<\/span><span class=\"token function\">GetAddr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> _addr<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string <span class=\"token function\">PrintDebug<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> _ip <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;:&#034;<\/span> <span class=\"token operator\">&#043;<\/span> std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">to_string<\/span><span class=\"token punctuation\">(<\/span>_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token operator\">~<\/span><span class=\"token function\">InetAddr<\/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\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string _ip<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> _port<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> _addr<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5c01\u88c5\u5b83\u7684\u610f\u4e49\u5728\u4e8e&#xff1a;\u6784\u9020\u51fd\u6570 1 \u7528\u4e8e recvfrom \u540e\u89e3\u6790\u5bf9\u65b9\u5730\u5740&#xff0c;\u6784\u9020\u51fd\u6570 2 \u7528\u4e8e bind\/sendto \u524d\u6784\u9020\u5730\u5740&#xff0c;\u628a htons\/inet_addr\/bzero \u8fd9\u4e9b\u7e41\u7410\u64cd\u4f5c\u85cf\u5728\u7c7b\u5185\u90e8\u3002GetAddr() \u5219\u5bf9\u5916\u66b4\u9732\u5e95\u5c42 sockaddr_in&#xff0c;\u76f4\u63a5\u4f20\u7ed9 bind\/sendto \u7b49\u7cfb\u7edf\u8c03\u7528\u3002<\/p>\n<h4>2.3 \u9519\u8bef\u7801\u679a\u4e3e<\/h4>\n<p><span class=\"token comment\">\/\/ Comm.hpp<\/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\">once<\/span><\/span><br \/>\n<span class=\"token keyword\">enum<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    Usage_Err <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    Socket_Err<span class=\"token punctuation\">,<\/span><br \/>\n    Bind_Err<br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>2.4 UdpServer \u6838\u5fc3\u5b9e\u73b0<\/h4>\n<p><span class=\"token comment\">\/\/ UdpServer.hpp<\/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\">once<\/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;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;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;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;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;strings.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;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;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><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&#034;nocopy.hpp&#034;<\/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;cstdio&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\">&#034;Comm.hpp&#034;<\/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\">&#034;InetAddr.hpp&#034;<\/span><\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7b80\u5355\u65e5\u5fd7\u5b8f&#xff1a;\u76f4\u63a5\u6253\u5370\u5230 stderr&#xff0c;\u65e0\u9700\u989d\u5916\u65e5\u5fd7\u5e93<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name function\">LOG_FATAL<\/span><span class=\"token expression\"><span class=\"token punctuation\">(<\/span>fmt<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 function\">fprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">stderr<\/span><span class=\"token punctuation\">,<\/span> <\/span><span class=\"token string\">&#034;[FATAL] &#034;<\/span> <span class=\"token expression\">fmt <\/span><span class=\"token string\">&#034;\\\\n&#034;<\/span><span class=\"token expression\"><span class=\"token punctuation\">,<\/span> <\/span><span class=\"token punctuation\">##<\/span><span class=\"token expression\">__VA_ARGS__<span class=\"token punctuation\">)<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name function\">LOG_INFO<\/span><span class=\"token expression\"><span class=\"token punctuation\">(<\/span>fmt<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 function\">fprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">stderr<\/span><span class=\"token punctuation\">,<\/span> <\/span><span class=\"token string\">&#034;[INFO] &#034;<\/span> <span class=\"token expression\">fmt <\/span><span class=\"token string\">&#034;\\\\n&#034;<\/span><span class=\"token expression\"><span class=\"token punctuation\">,<\/span> <\/span><span class=\"token punctuation\">##<\/span><span class=\"token expression\">__VA_ARGS__<span class=\"token punctuation\">)<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name function\">LOG_DEBUG<\/span><span class=\"token expression\"><span class=\"token punctuation\">(<\/span>fmt<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 function\">fprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">stderr<\/span><span class=\"token punctuation\">,<\/span> <\/span><span class=\"token string\">&#034;[DEBUG] &#034;<\/span> <span class=\"token expression\">fmt <\/span><span class=\"token string\">&#034;\\\\n&#034;<\/span><span class=\"token expression\"><span class=\"token punctuation\">,<\/span> <\/span><span class=\"token punctuation\">##<\/span><span class=\"token expression\">__VA_ARGS__<span class=\"token punctuation\">)<\/span><\/span><\/span><\/p>\n<p><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">uint16_t<\/span> defaultport <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">8888<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">int<\/span> defaultfd <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">int<\/span> defaultsize <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1024<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UdpServer<\/span> <span class=\"token operator\">:<\/span> <span class=\"token base-clause\"><span class=\"token keyword\">public<\/span> <span class=\"token class-name\">nocopy<\/span><\/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><span class=\"token keyword\">uint16_t<\/span> port <span class=\"token operator\">&#061;<\/span> defaultport<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token operator\">:<\/span> <span class=\"token function\">_port<\/span><span class=\"token punctuation\">(<\/span>port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">_sockfd<\/span><span class=\"token punctuation\">(<\/span>defaultfd<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">void<\/span> <span class=\"token function\">Init<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ 1. \u521b\u5efa socket&#xff08;SOCK_DGRAM &#061; UDP&#xff09;<\/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            <span class=\"token function\">LOG_FATAL<\/span><span class=\"token punctuation\">(<\/span> <span class=\"token string\">&#034;socket error, %d : %s&#034;<\/span><span class=\"token punctuation\">,<\/span> errno<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span>Socket_Err<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token function\">LOG_INFO<\/span><span class=\"token punctuation\">(<\/span> <span class=\"token string\">&#034;socket success, sockfd: %d&#034;<\/span><span class=\"token punctuation\">,<\/span> _sockfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 2. bind \u7ed1\u5b9a\u7aef\u53e3&#xff08;0.0.0.0 &#061; INADDR_ANY&#xff0c;\u7ed1\u5b9a\u6240\u6709\u53ef\u7528 IP&#xff09;<\/span><br \/>\n        InetAddr <span class=\"token function\">local<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;0.0.0.0&#034;<\/span><span class=\"token punctuation\">,<\/span> _port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> n <span class=\"token operator\">&#061;<\/span> <span class=\"token double-colon punctuation\">::<\/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 function\">GetAddr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>local<span class=\"token punctuation\">.<\/span><span class=\"token function\">GetAddr<\/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><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>n <span class=\"token operator\">!&#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\">LOG_FATAL<\/span><span class=\"token punctuation\">(<\/span> <span class=\"token string\">&#034;bind error, %d : %s&#034;<\/span><span class=\"token punctuation\">,<\/span> errno<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span>Bind_Err<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 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>defaultsize<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/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><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 n <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><br \/>\n                                 <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>n <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><br \/>\n                InetAddr <span class=\"token function\">addr<\/span><span class=\"token punctuation\">(<\/span>peer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                buffer<span class=\"token punctuation\">[<\/span>n<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><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;[&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> addr<span class=\"token punctuation\">.<\/span><span class=\"token function\">PrintDebug<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <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 comment\">\/\/ Echo \u56de\u53bb<\/span><br \/>\n                <span class=\"token function\">sendto<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span> buffer<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>buffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                       <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 punctuation\">}<\/span><\/p>\n<p>    <span class=\"token operator\">~<\/span><span class=\"token function\">UdpServer<\/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\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> _port<span class=\"token punctuation\">;<\/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<p>Start() \u51fd\u6570\u62c6\u89e3\u2014\u2014UDP \u670d\u52a1\u5668\u7684\u6838\u5fc3\u5faa\u73af\u53ea\u6709\u56db\u4ef6\u4e8b&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u2460 recvfrom \u2014 \u963b\u585e\u7b49\u5f85\u5ba2\u6237\u7aef\u6d88\u606f&#xff0c;\u540c\u65f6\u83b7\u53d6\u5bf9\u65b9\u5730\u5740<\/span><br \/>\nssize_t n <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><br \/>\n                     <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><\/p>\n<p><span class=\"token comment\">\/\/ \u2461 \u5904\u7406\u6d88\u606f \u2014 Echo \u670d\u52a1\u5668\u76f4\u63a5\u539f\u6837\u8fd4\u56de&#xff0c;V2\/V3 \u5728\u8fd9\u91cc\u8c03\u7528\u4e1a\u52a1\u56de\u8c03<\/span><br \/>\nbuffer<span class=\"token punctuation\">[<\/span>n<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\nstd<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;[&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> addr<span class=\"token punctuation\">.<\/span><span class=\"token function\">PrintDebug<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <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><span class=\"token comment\">\/\/ \u2462 sendto \u2014 \u5c06\u54cd\u5e94\u53d1\u56de\u7ed9\u5ba2\u6237\u7aef&#xff08;peer \u4fdd\u5b58\u4e86\u5ba2\u6237\u7aef\u5730\u5740&#xff09;<\/span><br \/>\n<span class=\"token function\">sendto<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span> buffer<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>buffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><br \/>\n       <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><\/p>\n<p><span class=\"token comment\">\/\/ \u2463 \u5faa\u73af \u2014 UDP \u65e0\u9700 close \u5ba2\u6237\u7aef\u8fde\u63a5&#xff0c;\u76f4\u63a5\u56de\u5230 recvfrom \u7b49\u5f85\u4e0b\u4e00\u6761<\/span><\/p>\n<table>\n<tr>\u62c6\u89e3\u505a\u4e86\u4ec0\u4e48\u5173\u952e\u70b9<\/tr>\n<tbody>\n<tr>\n<td>\u2460 recvfrom<\/td>\n<td>\u963b\u585e\u7b49\u5f85 &#043; \u83b7\u53d6\u5bf9\u65b9\u5730\u5740<\/td>\n<td>peer \u548c len \u662f\u8f93\u51fa\u53c2\u6570&#xff0c;len \u4f20\u5165\u524d\u5fc5\u987b\u521d\u59cb\u5316\u4e3a sizeof(peer)<\/td>\n<\/tr>\n<tr>\n<td>\u2461 \u4e1a\u52a1\u5904\u7406<\/td>\n<td>Echo \u76f4\u63a5\u56de\u539f\u4e32<\/td>\n<td>V2\/V3 \u4e2d\u66ff\u6362\u4e3a\u56de\u8c03&#xff0c;\u6b64\u5904\u662f\u552f\u4e00\u4f1a\u968f\u9700\u6c42\u53d8\u5316\u7684\u6b65\u9aa4<\/td>\n<\/tr>\n<tr>\n<td>\u2462 sendto<\/td>\n<td>\u5c06\u7ed3\u679c\u53d1\u56de<\/td>\n<td>\u4f7f\u7528 recvfrom \u83b7\u5f97\u7684 peer \u5730\u5740&#xff0c;\u4fdd\u8bc1&#034;\u8c01\u53d1\u7684\u56de\u7ed9\u8c01&#034;<\/td>\n<\/tr>\n<tr>\n<td>\u2463 \u5faa\u73af<\/td>\n<td>\u56de\u5230 recvfrom<\/td>\n<td>UDP \u65e0\u8fde\u63a5\u72b6\u6001&#xff0c;\u4e0d\u9700\u8981 close \u67d0\u4e2a\u5ba2\u6237\u7aef fd<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5173\u952e API \u901f\u67e5\u2014\u2014UDP \u7f16\u7a0b\u7684\u56db\u4e2a\u6838\u5fc3\u51fd\u6570&#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;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;sys\/socket.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u521b\u5efa\u5957\u63a5\u5b57<\/span><br \/>\n<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><br \/>\n<span class=\"token comment\">\/\/   domain:  \u534f\u8bae\u65cf \u2014 AF_INET(IPv4) \/ AF_INET6(IPv6) \/ AF_UNIX(\u672c\u5730)<\/span><br \/>\n<span class=\"token comment\">\/\/   type:    \u5957\u63a5\u5b57\u7c7b\u578b \u2014 SOCK_DGRAM(UDP) \/ SOCK_STREAM(TCP)<\/span><br \/>\n<span class=\"token comment\">\/\/   protocol: \u5177\u4f53\u534f\u8bae&#xff0c;\u4f20 0 \u8868\u793a\u7531 domain&#043;type \u81ea\u52a8\u51b3\u5b9a<\/span><br \/>\n<span class=\"token comment\">\/\/   \u8fd4\u56de\u503c:  \u6210\u529f\u8fd4\u56de\u6587\u4ef6\u63cf\u8ff0\u7b26(fd)&#xff0c;\u5931\u8d25\u8fd4\u56de -1&#xff0c;\u8bbe\u7f6e errno<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7ed1\u5b9a\u5730\u5740\u548c\u7aef\u53e3<\/span><br \/>\n<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><br \/>\n<span class=\"token comment\">\/\/   sockfd:  socket() \u8fd4\u56de\u7684 fd<\/span><br \/>\n<span class=\"token comment\">\/\/   addr:    \u8981\u7ed1\u5b9a\u7684\u672c\u5730\u5730\u5740(IP&#043;\u7aef\u53e3)&#xff0c;\u4f20\u53c2\u65f6\u5f3a\u8f6c\u4e3a sockaddr*<\/span><br \/>\n<span class=\"token comment\">\/\/   addrlen: \u5730\u5740\u7ed3\u6784\u4f53\u5927\u5c0f(sizeof(sockaddr_in))<\/span><br \/>\n<span class=\"token comment\">\/\/   \u8fd4\u56de\u503c:  \u6210\u529f 0&#xff0c;\u5931\u8d25 -1&#xff08;\u5e38\u89c1&#xff1a;EADDRINUSE \u7aef\u53e3\u88ab\u5360\u7528&#xff09;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u63a5\u6536\u6570\u636e&#xff08;\u540c\u65f6\u83b7\u53d6\u53d1\u9001\u65b9\u5730\u5740&#xff0c;UDP\u4e13\u7528&#xff09;<\/span><br \/>\nssize_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><br \/>\n                 <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><br \/>\n<span class=\"token comment\">\/\/   buf:      \u63a5\u6536\u7f13\u51b2\u533a<\/span><br \/>\n<span class=\"token comment\">\/\/   len:      \u7f13\u51b2\u533a\u5927\u5c0f<\/span><br \/>\n<span class=\"token comment\">\/\/   flags:    \u6807\u5fd7\u4f4d&#xff0c;\u901a\u5e38\u4f20 0<\/span><br \/>\n<span class=\"token comment\">\/\/   src_addr: \u8f93\u51fa\u53c2\u6570&#xff0c;\u4fdd\u5b58\u53d1\u9001\u65b9\u7684\u5730\u5740\u4fe1\u606f<\/span><br \/>\n<span class=\"token comment\">\/\/   addrlen:  \u8f93\u5165\u8f93\u51fa\u53c2\u6570&#xff0c;\u4f20\u5165 src_addr \u7684\u5927\u5c0f&#xff0c;\u4f20\u51fa\u5b9e\u9645\u5927\u5c0f<\/span><br \/>\n<span class=\"token comment\">\/\/   \u8fd4\u56de\u503c:   \u6210\u529f\u8fd4\u56de\u5b9e\u9645\u63a5\u6536\u7684\u5b57\u8282\u6570&#xff0c;\u5931\u8d25\u8fd4\u56de -1<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u53d1\u9001\u6570\u636e&#xff08;\u6307\u5b9a\u76ee\u6807\u5730\u5740&#xff0c;UDP\u4e13\u7528&#xff09;<\/span><br \/>\nssize_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><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>dest_addr<span class=\"token punctuation\">,<\/span> socklen_t addrlen<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/   dest_addr: \u76ee\u6807\u5730\u5740(IP&#043;\u7aef\u53e3)<\/span><br \/>\n<span class=\"token comment\">\/\/   addrlen:   \u5730\u5740\u7ed3\u6784\u4f53\u5927\u5c0f<\/span><br \/>\n<span class=\"token comment\">\/\/   \u8fd4\u56de\u503c:    \u6210\u529f\u8fd4\u56de\u5b9e\u9645\u53d1\u9001\u7684\u5b57\u8282\u6570&#xff0c;\u5931\u8d25\u8fd4\u56de -1<\/span><\/p>\n<p>\u56db\u70b9\u8bb0\u5fc6\u8bc0\u7a8d&#xff1a;<\/p>\n<table>\n<tr>\u6b65\u9aa4\u63a5\u53e3\u8981\u70b9<\/tr>\n<tbody>\n<tr>\n<td>\u521b\u5efa socket<\/td>\n<td>socket(AF_INET, SOCK_DGRAM, 0)<\/td>\n<td>SOCK_DGRAM &#061; UDP&#xff0c;\u8fd4\u56de\u7684\u662f fd<\/td>\n<\/tr>\n<tr>\n<td>\u7ed1\u5b9a\u7aef\u53e3<\/td>\n<td>bind() &#043; INADDR_ANY<\/td>\n<td>\u670d\u52a1\u7aef\u7ed1\u5b9a\u56fa\u5b9a\u7aef\u53e3&#xff0c;\u5ba2\u6237\u7aef\u624d\u77e5\u9053\u53d1\u7ed9\u8c01<\/td>\n<\/tr>\n<tr>\n<td>\u63a5\u6536\u6570\u636e<\/td>\n<td>recvfrom()<\/td>\n<td>\u540e\u4e24\u4e2a\u53c2\u6570\u662f\u8f93\u51fa&#xff0c;\u544a\u8bc9\u4f60&#034;\u8c01\u53d1\u7684&#034;<\/td>\n<\/tr>\n<tr>\n<td>\u53d1\u9001\u6570\u636e<\/td>\n<td>sendto()<\/td>\n<td>\u540e\u4e24\u4e2a\u53c2\u6570\u662f\u8f93\u5165&#xff0c;\u6307\u5b9a&#034;\u53d1\u7ed9\u8c01&#034;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>[\u6b64\u5904\u63d2\u5165\u56fe\u7247] AI\u63d0\u793a\u8bcd&#xff1a;\u7ec8\u7aef\u8fd0\u884c\u622a\u56fe\u98ce\u683c\u7684\u6280\u672f\u63d2\u56fe\u3002\u6a21\u62dfLinux\u7ec8\u7aef\u7a97\u53e3&#xff0c;\u4e0a\u534a\u90e8\u5206\u663e\u793a&#034;\u670d\u52a1\u7aef\u542f\u52a8\u65e5\u5fd7&#xff1a;socket success, sockfd: 3&#034;&#xff0c;\u4e0b\u534a\u90e8\u5206\u663e\u793a&#034;\u5ba2\u6237\u7aef\u53d1\u9001hello\u540e\u6536\u5230\u7684\u56de\u663e&#xff1a;[127.0.0.1:xxxxx]# hello \u2192 server echo# hello&#034;\u3002\u7ec8\u7aef\u9ed1\u5e95\u7eff\u5b57\u98ce\u683c&#xff0c;\u6a21\u62df\u771f\u5b9e\u8fd0\u884c\u7ed3\u679c\u3002<\/p>\n<p>INADDR_ANY \u662f\u4ec0\u4e48&#xff1f; \u5b83\u7684\u503c\u662f 0x00000000&#xff0c;\u8868\u793a&#034;\u7ed1\u5b9a\u672c\u673a\u6240\u6709\u53ef\u7528 IP&#034;\u3002\u5f53\u670d\u52a1\u5668\u6709\u591a\u5f20\u7f51\u5361&#xff08;\u591a\u4e2a IP&#xff09;\u65f6&#xff0c;\u4f7f\u7528 INADDR_ANY \u53ef\u4ee5\u63a5\u6536\u53d1\u5f80\u4efb\u610f\u7f51\u5361\u7684\u6570\u636e&#xff0c;\u800c\u4e0d\u9700\u8981\u5199\u6b7b\u67d0\u4e2a IP\u3002\u4e91\u670d\u52a1\u5668\u4e0a\u4e5f\u4e0d\u5efa\u8bae bind \u5177\u4f53 IP\u3002<\/p>\n<p>\u5b57\u8282\u5e8f\u8f6c\u6362\u51fd\u6570\u2014\u2014\u7aef\u53e3\u53f7\u548c IP \u5730\u5740\u586b\u5165\u7ed3\u6784\u4f53\u524d\u5fc5\u987b\u8f6c\u4e3a\u7f51\u7edc\u5b57\u8282\u5e8f&#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;arpa\/inet.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">uint16_t<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">uint16_t<\/span> hostshort<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ Host TO Network Short \u2014 \u7aef\u53e3\u53f7&#xff08;16\u4f4d&#xff09;<\/span><br \/>\n<span class=\"token keyword\">uint32_t<\/span> <span class=\"token function\">htonl<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">uint32_t<\/span> hostlong<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ Host TO Network Long  \u2014 IP \u5730\u5740&#xff08;32\u4f4d&#xff09;<\/span><br \/>\n<span class=\"token keyword\">uint16_t<\/span> <span class=\"token function\">ntohs<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">uint16_t<\/span> netshort<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ Network TO Host Short \u2014 \u63a5\u6536\u540e\u8f6c\u56de<\/span><br \/>\n<span class=\"token keyword\">uint32_t<\/span> <span class=\"token function\">ntohl<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">uint32_t<\/span> netlong<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/ Network TO Host Long  \u2014 \u63a5\u6536\u540e\u8f6c\u56de<\/span><\/p>\n<p>\u8bb0\u5fc6&#xff1a;h&#061;\u4e3b\u673a, n&#061;\u7f51\u7edc, s&#061;short\/16\u4f4d, l&#061;long\/32\u4f4d\u3002htons &#061; \u628a 16 \u4f4d\u6570\u636e\u4ece\u4e3b\u673a\u5e8f\u8f6c\u7f51\u7edc\u5e8f\u3002\u5fd8\u4e86\u5199 htons() \u662f\u6700\u7ecf\u5178\u7684\u65b0\u624b\u9519\u8bef\u3002<\/p>\n<h4>2.5 \u670d\u52a1\u7aef\u5165\u53e3 Main.cpp<\/h4>\n<p><span class=\"token comment\">\/\/ Main.cpp<\/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\">&#034;UdpServer.hpp&#034;<\/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><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">Usage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string <span class=\"token operator\">&amp;<\/span>process<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> process <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 punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ .\/udp_server 8888<\/span><br \/>\n<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> <span class=\"token punctuation\">{<\/span> <span class=\"token function\">Usage<\/span><span class=\"token punctuation\">(<\/span>argv<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">return<\/span> Usage_Err<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> port <span class=\"token operator\">&#061;<\/span> std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">stoi<\/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><\/p>\n<p>    std<span class=\"token double-colon punctuation\">::<\/span>unique_ptr<span class=\"token operator\">&lt;<\/span>UdpServer<span class=\"token operator\">&gt;<\/span> usvr <span class=\"token operator\">&#061;<\/span> std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token generic-function\"><span class=\"token function\">make_unique<\/span><span class=\"token generic class-name\"><span class=\"token operator\">&lt;<\/span>UdpServer<span class=\"token operator\">&gt;<\/span><\/span><\/span><span class=\"token punctuation\">(<\/span>port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    usvr<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">Init<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    usvr<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>V1 \u548c V2 \u7684 Main.cpp \u7ed3\u6784\u51e0\u4e4e\u4e00\u6837\u2014\u2014\u533a\u522b\u53ea\u5728\u4e8e V2 \u7684 UdpServer \u6784\u9020\u51fd\u6570\u591a\u4e86\u4e00\u4e2a func_t \u56de\u8c03\u53c2\u6570\u3002\u8fd9\u5c31\u662f\u56de\u8c03\u5206\u79bb\u4e1a\u52a1\u7684\u4f18\u52bf&#xff1a;main() \u51e0\u4e4e\u4e0d\u7528\u6539\u3002<\/p>\n<h4>2.6 UdpClient \u5b9e\u73b0\u4e0e bind \u95ee\u9898<\/h4>\n<p><span class=\"token comment\">\/\/ UdpClient.cpp<\/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;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;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;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;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;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;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;arpa\/inet.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;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\">&#034;InetAddr.hpp&#034;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">Usage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string <span class=\"token operator\">&amp;<\/span>process<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> process <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 punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ .\/udp_client server_ip server_port<\/span><br \/>\n<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> <span class=\"token punctuation\">{<\/span> <span class=\"token function\">Usage<\/span><span class=\"token punctuation\">(<\/span>argv<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p>    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> std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">stoi<\/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><\/p>\n<p>    <span class=\"token comment\">\/\/ 1. \u521b\u5efa socket<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> 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_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>sock <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> std<span class=\"token double-colon punctuation\">::<\/span>cerr <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;socket error: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span> <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 socket success: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> sock <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\">\/\/ 2. \u6784\u9020\u670d\u52a1\u7aef\u5730\u5740<\/span><br \/>\n    InetAddr <span class=\"token function\">server<\/span><span class=\"token punctuation\">(<\/span>serverip<span class=\"token punctuation\">,<\/span> serverport<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>string inbuffer<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        std<span class=\"token double-colon punctuation\">::<\/span><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> inbuffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        ssize_t n <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">sendto<\/span><span class=\"token punctuation\">(<\/span>sock<span class=\"token punctuation\">,<\/span> inbuffer<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> inbuffer<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><br \/>\n                           <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>server<span class=\"token punctuation\">.<\/span><span class=\"token function\">GetAddr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><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 function\">GetAddr<\/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><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>n <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/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><span class=\"token number\">1024<\/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> temp<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>temp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            ssize_t m <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">recvfrom<\/span><span class=\"token punctuation\">(<\/span>sock<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><br \/>\n                                 <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>temp<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>m <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> buffer<span class=\"token punctuation\">[<\/span>m<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;server echo# &#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> <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">break<\/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>sock<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>UdpClient \u4e3b\u6d41\u7a0b\u62c6\u89e3&#xff1a;<\/p>\n<table>\n<tr>\u6b65\u9aa4\u4ee3\u7801\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>\u2460 \u521b\u5efa socket<\/td>\n<td>socket(AF_INET, SOCK_DGRAM, 0)<\/td>\n<td>\u4e0e\u670d\u52a1\u7aef\u4e00\u6837&#xff0c;SOCK_DGRAM &#061; UDP<\/td>\n<\/tr>\n<tr>\n<td>\u2461 \u586b\u5145\u670d\u52a1\u7aef\u5730\u5740<\/td>\n<td>inet_addr(serverip) &#043; htons(serverport)<\/td>\n<td>\u544a\u8bc9 sendto \u53d1\u7ed9\u8c01\u2014\u2014IP \u548c\u7aef\u53e3\u90fd\u8981\u8f6c\u7f51\u7edc\u5e8f<\/td>\n<\/tr>\n<tr>\n<td>\u2462 \u53d1\u9001<\/td>\n<td>sendto(sock, &#8230;, &amp;server, sizeof(server))<\/td>\n<td>\u9996\u6b21\u8c03\u7528\u65f6 OS \u81ea\u52a8 bind \u968f\u673a\u7aef\u53e3<\/td>\n<\/tr>\n<tr>\n<td>\u2463 \u63a5\u6536\u56de\u590d<\/td>\n<td>recvfrom(sock, &#8230;, &amp;temp, &amp;len)<\/td>\n<td>temp \u4fdd\u5b58\u670d\u52a1\u7aef\u7684\u56de\u590d\u5730\u5740&#xff08;\u901a\u5e38\u4e0e server \u4e00\u81f4&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260725025738-6a64262205c03.png\" alt=\"QQ20260519-215046\" \/><\/p>\n<p>\u5ba2\u6237\u7aef\u8981\u4e0d\u8981 bind&#xff1f; \u4e00\u5b9a\u8981 bind&#xff0c;\u4f46\u4e0d\u9700\u8981\u663e\u5f0f bind\u3002\u539f\u56e0\u5f88\u7b80\u5355&#xff1a;\u670d\u52a1\u7aef\u7aef\u53e3\u662f\u4f17\u6240\u5468\u77e5\u7684&#xff08;HTTP 80\u3001SSH 22&#xff09;&#xff0c;\u5ba2\u6237\u7aef\u7aef\u53e3\u65e0\u6240\u8c13\u662f\u591a\u5c11\u3002\u5982\u679c\u5ba2\u6237\u7aef\u81ea\u5df1 bind&#xff0c;\u4e00\u65e6\u7aef\u53e3\u51b2\u7a81\u5c31\u542f\u52a8\u4e0d\u4e86\u3002\u4ea4\u7ed9 OS \u5728\u9996\u6b21 sendto() \u65f6\u81ea\u52a8\u5206\u914d\u968f\u673a\u7aef\u53e3&#xff0c;\u65e2\u7701\u5fc3\u53c8\u80fd\u652f\u6301\u5927\u91cf\u5ba2\u6237\u7aef\u540c\u65f6\u8fd0\u884c\u3002<\/p>\n<p>[\u6b64\u5904\u63d2\u5165\u56fe\u7247] AI\u63d0\u793a\u8bcd&#xff1a;\u7ec8\u7aef\u622a\u56fe\u98ce\u683c\u63d2\u56fe\u3002\u4e24\u4e2a\u5e76\u6392\u7684Linux\u7ec8\u7aef\u7a97\u53e3\u2014\u2014\u5de6\u7a97\u53e3&#034;\u670d\u52a1\u7aef&#034;\u663e\u793a\u65e5\u5fd7&#034;[127.0.0.1:44444]# hello&#034;&#xff0c;\u53f3\u7a97\u53e3&#034;\u5ba2\u6237\u7aef&#034;\u663e\u793a\u4ea4\u4e92&#034;Please Enter# hello \u2192 server echo# hello&#034;\u3002\u9ed1\u5e95\u7eff\u5b57\u7ec8\u7aef\u98ce\u683c&#xff0c;\u7a97\u53e3\u6807\u9898\u680f\u5206\u522b\u6807\u6ce8&#034;.\/udp_server 8888&#034;\u548c&#034;.\/udp_client 127.0.0.1 8888&#034;\u3002<\/p>\n<h3>\u4e09\u3001V2&#xff1a;UDP \u5b57\u5178\u670d\u52a1\u5668<\/h3>\n<p>V1 \u7684 Echo \u670d\u52a1\u5668\u53ea\u662f\u4e00\u4e2a\u6846\u67b6\u2014\u2014\u7f51\u7edc\u4ee3\u7801\u548c\u4e1a\u52a1\u903b\u8f91\u6df7\u5728\u4e00\u8d77\u3002V2 \u7684\u76ee\u6807\u662f\u5206\u79bb\u5173\u6ce8\u70b9&#xff1a;\u7f51\u7edc\u5c42\u53ea\u8d1f\u8d23\u6536\u53d1&#xff0c;\u4e1a\u52a1\u5c42\u8d1f\u8d23\u5904\u7406\u8bf7\u6c42&#xff0c;\u901a\u8fc7\u56de\u8c03\u51fd\u6570\u4e32\u8054\u3002<\/p>\n<h4>3.1 Dict \u5b57\u5178\u52a0\u8f7d<\/h4>\n<p>\u5148\u4ece\u6570\u636e\u8bf4\u8d77\u2014\u2014\u51c6\u5907\u4e00\u4e2a dict.txt&#xff0c;\u683c\u5f0f\u4e3a \u5355\u8bcd: \u91ca\u4e49&#xff1a;<\/p>\n<p>apple: \u82f9\u679c<br \/>\nbanana: \u9999\u8549<br \/>\nhello: \u4f60\u597d<br \/>\ngoodbye: \u518d\u89c1<br \/>\n&#8230;<\/p>\n<p>Dict \u7c7b\u8d1f\u8d23\u52a0\u8f7d\u548c\u67e5\u8be2&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ Dict.hpp<\/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\">once<\/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;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;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;fstream&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;unordered_map&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string sep <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;: &#034;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Dict<\/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\">Dict<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string <span class=\"token operator\">&amp;<\/span>confpath<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span> <span class=\"token function\">_confpath<\/span><span class=\"token punctuation\">(<\/span>confpath<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">LoadDict<\/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>    std<span class=\"token double-colon punctuation\">::<\/span>string <span class=\"token function\">Translate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string <span class=\"token operator\">&amp;<\/span>key<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">auto<\/span> iter <span class=\"token operator\">&#061;<\/span> _dict<span class=\"token punctuation\">.<\/span><span class=\"token function\">find<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>iter <span class=\"token operator\">&#061;&#061;<\/span> _dict<span class=\"token punctuation\">.<\/span><span class=\"token function\">end<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">string<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Unknown&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">return<\/span> iter<span class=\"token operator\">-&gt;<\/span>second<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token operator\">~<\/span><span class=\"token function\">Dict<\/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\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">LoadDict<\/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>ifstream <span class=\"token function\">in<\/span><span class=\"token punctuation\">(<\/span>_confpath<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>in<span class=\"token punctuation\">.<\/span><span class=\"token function\">is_open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> std<span class=\"token double-colon punctuation\">::<\/span>cerr <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;open file error&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>string line<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">getline<\/span><span class=\"token punctuation\">(<\/span>in<span class=\"token punctuation\">,<\/span> line<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>line<span class=\"token punctuation\">.<\/span><span class=\"token function\">empty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">auto<\/span> pos <span class=\"token operator\">&#061;<\/span> line<span class=\"token punctuation\">.<\/span><span class=\"token function\">find<\/span><span class=\"token punctuation\">(<\/span>sep<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>pos <span class=\"token operator\">&#061;&#061;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string<span class=\"token double-colon punctuation\">::<\/span>npos<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>string key <span class=\"token operator\">&#061;<\/span> line<span class=\"token punctuation\">.<\/span><span class=\"token function\">substr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> pos<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>string value <span class=\"token operator\">&#061;<\/span> line<span class=\"token punctuation\">.<\/span><span class=\"token function\">substr<\/span><span class=\"token punctuation\">(<\/span>pos <span class=\"token operator\">&#043;<\/span> sep<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 punctuation\">;<\/span><br \/>\n            _dict<span class=\"token punctuation\">.<\/span><span class=\"token function\">insert<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">make_pair<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        in<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/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>    std<span class=\"token double-colon punctuation\">::<\/span>string _confpath<span class=\"token punctuation\">;<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>unordered_map<span class=\"token operator\">&lt;<\/span>std<span class=\"token double-colon punctuation\">::<\/span>string<span class=\"token punctuation\">,<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string<span class=\"token operator\">&gt;<\/span> _dict<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>3.2 UdpServer \u91cd\u6784\u2014\u2014\u56de\u8c03\u5206\u79bb\u4e1a\u52a1<\/h4>\n<p>\u6838\u5fc3\u6539\u52a8&#xff1a;\u7528 std::function \u5c06\u4e1a\u52a1\u5904\u7406&#034;\u6ce8\u5165&#034;\u670d\u52a1\u5668&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u5b9a\u4e49\u56de\u8c03\u51fd\u6570\u7c7b\u578b&#xff1a;\u63a5\u6536\u8bf7\u6c42\u5b57\u7b26\u4e32&#xff0c;\u8f93\u51fa\u54cd\u5e94\u5b57\u7b26\u4e32<\/span><br \/>\n<span class=\"token keyword\">using<\/span> func_t <span class=\"token operator\">&#061;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>function<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string <span class=\"token operator\">&amp;<\/span>req<span class=\"token punctuation\">,<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string <span class=\"token operator\">*<\/span>resp<span class=\"token punctuation\">)<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UdpServer<\/span> <span class=\"token operator\">:<\/span> <span class=\"token base-clause\"><span class=\"token keyword\">public<\/span> <span class=\"token class-name\">nocopy<\/span><\/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>func_t func<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">uint16_t<\/span> port <span class=\"token operator\">&#061;<\/span> defaultport<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token operator\">:<\/span> <span class=\"token function\">_func<\/span><span class=\"token punctuation\">(<\/span>func<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">_port<\/span><span class=\"token punctuation\">(<\/span>port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">_sockfd<\/span><span class=\"token punctuation\">(<\/span>defaultfd<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ Init() \u540c\u4e0a&#xff0c;\u7565&#8230;<\/span><\/p>\n<p>    <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>defaultsize<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/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><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 n <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><br \/>\n                                 <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>n <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><br \/>\n                InetAddr <span class=\"token function\">addr<\/span><span class=\"token punctuation\">(<\/span>peer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                buffer<span class=\"token punctuation\">[<\/span>n<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><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;[&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> addr<span class=\"token punctuation\">.<\/span><span class=\"token function\">PrintDebug<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <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 value<span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token function\">_func<\/span><span class=\"token punctuation\">(<\/span>buffer<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u56de\u8c03\u4e1a\u52a1\u65b9\u6cd5&#xff0c;\u4e0d\u5173\u5fc3\u5177\u4f53\u505a\u4ec0\u4e48<\/span><br \/>\n                <span class=\"token function\">sendto<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span> value<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> value<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><br \/>\n                       <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 punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    func_t _func<span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/ \u56de\u8c03\u51fd\u6570\u2014\u2014\u8fd9\u662f\u4e0e V1 \u7684\u552f\u4e00\u672c\u8d28\u533a\u522b<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> _port<span class=\"token punctuation\">;<\/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<h4>3.3 Main \u6574\u5408<\/h4>\n<p><span class=\"token comment\">\/\/ Main.cpp<\/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\">&#034;UdpServer.hpp&#034;<\/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\">&#034;Dict.hpp&#034;<\/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><\/p>\n<p>Dict <span class=\"token function\">gdict<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;.\/dict.txt&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">Execute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string <span class=\"token operator\">&amp;<\/span>req<span class=\"token punctuation\">,<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string <span class=\"token operator\">*<\/span>resp<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token operator\">*<\/span>resp <span class=\"token operator\">&#061;<\/span> gdict<span class=\"token punctuation\">.<\/span><span class=\"token function\">Translate<\/span><span class=\"token punctuation\">(<\/span>req<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ .\/udp_server 8888<\/span><br \/>\n<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> <span class=\"token punctuation\">{<\/span> <span class=\"token function\">Usage<\/span><span class=\"token punctuation\">(<\/span>argv<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">return<\/span> Usage_Err<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> port <span class=\"token operator\">&#061;<\/span> std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">stoi<\/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><\/p>\n<p>    std<span class=\"token double-colon punctuation\">::<\/span>unique_ptr<span class=\"token operator\">&lt;<\/span>UdpServer<span class=\"token operator\">&gt;<\/span> usvr <span class=\"token operator\">&#061;<\/span> std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token generic-function\"><span class=\"token function\">make_unique<\/span><span class=\"token generic class-name\"><span class=\"token operator\">&lt;<\/span>UdpServer<span class=\"token operator\">&gt;<\/span><\/span><\/span><span class=\"token punctuation\">(<\/span>Execute<span class=\"token punctuation\">,<\/span> port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    usvr<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">Init<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    usvr<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><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260725025738-6a64262255a72.png\" alt=\"QQ20260519-215333\" \/><\/p>\n<p>\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u8fd0\u884c\u7ed3\u679c&#xff1a;<\/p>\n<p>[\u6b64\u5904\u63d2\u5165\u56fe\u7247] AI\u63d0\u793a\u8bcd&#xff1a;\u7ec8\u7aef\u622a\u56fe\u98ce\u683c\u63d2\u56fe\u3002\u5de6\u7a97\u53e3&#034;\u670d\u52a1\u7aef&#034;\u663e\u793a\u65e5\u5fd7&#034;[127.0.0.1:54321]# apple \u2192 \u67e5\u8be2\u6210\u529f&#034;&#xff0c;\u53f3\u7a97\u53e3&#034;\u5ba2\u6237\u7aef&#034;\u663e\u793a\u4ea4\u4e92&#034;\u8bf7\u8f93\u5165\u60a8\u8981\u67e5\u7684\u5355\u8bcd: apple \u2192 apple \u610f\u601d\u662f \u82f9\u679c&#034;\u3002\u9ed1\u5e95\u7eff\u5b57&#xff0c;\u7a97\u53e3\u6807\u9898\u4e3a&#034;.\/udp_server 8888&#034;\u548c&#034;.\/dict_client 127.0.0.1 8888&#034;\u3002<\/p>\n<p>V1 \u2192 V2 \u7684\u6838\u5fc3\u5347\u7ea7&#xff1a; \u670d\u52a1\u5668\u4e0d\u518d\u786c\u7f16\u7801\u5904\u7406\u903b\u8f91&#xff08;\u201c\u6536\u5230\u4ec0\u4e48\u5c31\u56de\u4ec0\u4e48\u201d&#xff09;&#xff0c;\u800c\u662f\u63a5\u53d7\u4e00\u4e2a func_t \u56de\u8c03\u3002Init() \u548c Start() \u5b8c\u5168\u4e0d\u53d8&#xff0c;\u4e1a\u52a1\u4ee3\u7801&#xff08;Execute \u2192 Dict::Translate&#xff09;\u5b8c\u5168\u72ec\u7acb\u3002\u8fd9\u4e3a\u540e\u7eed V3 \u7ee7\u7eed\u5347\u7ea7\u4e1a\u52a1\u903b\u8f91\u7559\u51fa\u4e86\u6269\u5c55\u7a7a\u95f4\u3002<\/p>\n<h4>3.4 \u5c01\u88c5\u7248 UdpSocket&#xff08;\u8865\u5145\u53c2\u8003&#xff09;<\/h4>\n<p>\u5c06\u539f\u59cb socket \u64cd\u4f5c\u5c01\u88c5\u4e3a UdpSocket \u7c7b&#xff0c;\u8fdb\u4e00\u6b65\u964d\u4f4e\u4f7f\u7528\u95e8\u69db&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ udp_socket.hpp<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UdpSocket<\/span> <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\">Socket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        fd_ <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\">return<\/span> fd_ <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 keyword\">bool<\/span> <span class=\"token function\">Bind<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string<span class=\"token operator\">&amp;<\/span> ip<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">uint16_t<\/span> port<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        sockaddr_in addr<span class=\"token punctuation\">;<\/span><br \/>\n        addr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n        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>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><br \/>\n        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>port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>fd_<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>addr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#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 keyword\">bool<\/span> <span class=\"token function\">RecvFrom<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span>string<span class=\"token operator\">*<\/span> buf<span class=\"token punctuation\">,<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string<span class=\"token operator\">*<\/span> ip <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">uint16_t<\/span><span class=\"token operator\">*<\/span> port <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">char<\/span> tmp<span class=\"token punctuation\">[<\/span><span class=\"token number\">10240<\/span><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        sockaddr_in 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 read_size <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">recvfrom<\/span><span class=\"token punctuation\">(<\/span>fd_<span class=\"token punctuation\">,<\/span> tmp<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>tmp<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>sockaddr<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>read_size <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        buf<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">assign<\/span><span class=\"token punctuation\">(<\/span>tmp<span class=\"token punctuation\">,<\/span> read_size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ip<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span>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 keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>port<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/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        <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 keyword\">bool<\/span> <span class=\"token function\">SendTo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string<span class=\"token operator\">&amp;<\/span> buf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string<span class=\"token operator\">&amp;<\/span> ip<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">uint16_t<\/span> port<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        sockaddr_in addr<span class=\"token punctuation\">;<\/span><br \/>\n        addr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n        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>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><br \/>\n        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>port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">sendto<\/span><span class=\"token punctuation\">(<\/span>fd_<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">.<\/span><span class=\"token function\">data<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> buf<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>sockaddr<span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>addr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <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 keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> fd_ <span class=\"token operator\">&#061;<\/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 punctuation\">;<\/span><\/p>\n<p>\u5728\u6b64\u57fa\u7840\u4e0a\u5b9e\u73b0 DictServer \u53ea\u9700\u51e0\u5341\u884c\u2014\u2014\u521b\u5efa UdpServer \u7ed1\u5b9a\u7aef\u53e3&#xff0c;\u6ce8\u518c Translate \u56de\u8c03&#xff0c;\u542f\u52a8\u5373\u53ef\u3002\u5c01\u88c5\u7684\u4ef7\u503c\u5728\u4e8e&#xff1a;\u628a\u7e41\u7410\u7684\u5730\u5740\u8f6c\u6362&#xff08;inet_addr\u3001htons\u3001ntohs\u3001inet_ntoa&#xff09;\u85cf\u5728\u5185\u90e8&#xff0c;\u4e0a\u5c42\u53ea\u9700\u4f20 string\u3002<\/p>\n<h3>\u56db\u3001V3&#xff1a;UDP \u591a\u7ebf\u7a0b\u804a\u5929\u5ba4<\/h3>\n<p>V2 \u662f\u4e00\u5bf9\u4e00\u7684\u5b57\u5178\u67e5\u8be2\u3002V3 \u5347\u7ea7\u4e3a\u4e00\u5bf9\u591a\u7684\u804a\u5929\u5ba4\u2014\u2014\u4efb\u4e00\u7528\u6237\u53d1\u8a00&#xff0c;\u6240\u6709\u4eba\u53ef\u89c1\u3002<\/p>\n<h4>4.1 \u67b6\u6784\u5347\u7ea7&#xff1a;\u5f15\u5165\u7ebf\u7a0b\u6c60<\/h4>\n<p>V3 \u7684\u6838\u5fc3\u53d8\u5316&#xff1a;\u6d88\u606f\u5904\u7406\u548c\u6d88\u606f\u8f6c\u53d1\u4e0d\u518d\u4e32\u884c\u6267\u884c&#xff0c;\u800c\u662f\u4ea4\u7531\u7ebf\u7a0b\u6c60\u5f02\u6b65\u5904\u7406&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260725025738-6a642622aa5d0.png\" alt=\"QQ20260520-220707\" \/><\/p>\n<p><span class=\"token comment\">\/\/ V3 UdpServer \u5173\u952e\u65b0\u589e<\/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\">&#034;ThreadPool.hpp&#034;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">using<\/span> task_t <span class=\"token operator\">&#061;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>function<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UdpServer<\/span> <span class=\"token operator\">:<\/span> <span class=\"token base-clause\"><span class=\"token keyword\">public<\/span> <span class=\"token class-name\">nocopy<\/span><\/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><span class=\"token keyword\">uint16_t<\/span> port <span class=\"token operator\">&#061;<\/span> defaultport<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span> <span class=\"token function\">_port<\/span><span class=\"token punctuation\">(<\/span>port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">_sockfd<\/span><span class=\"token punctuation\">(<\/span>defaultfd<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">pthread_mutex_init<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>_user_mutex<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">void<\/span> <span class=\"token function\">Init<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ 1. socket &amp; bind&#xff08;\u540c V1\/V2&#xff0c;\u7565&#xff09;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 2. \u542f\u52a8\u7ebf\u7a0b\u6c60<\/span><br \/>\n        <span class=\"token class-name\">ThreadPool<\/span><span class=\"token operator\">&lt;<\/span>task_t<span class=\"token operator\">&gt;<\/span><span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">GetInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><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 punctuation\">}<\/span><br \/>\n    <span class=\"token comment\">\/\/ &#8230;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>4.2 \u5728\u7ebf\u7528\u6237\u7ba1\u7406<\/h4>\n<p>\u6bcf\u6b21\u6536\u5230\u6d88\u606f\u65f6&#xff0c;\u5c06\u53d1\u9001\u65b9\u52a0\u5165\u5728\u7ebf\u7528\u6237\u5217\u8868\u3002\u7528\u4e92\u65a5\u9501\u4fdd\u62a4&#xff0c;\u56e0\u4e3a\u4e3b\u7ebf\u7a0b\u548c\u7ebf\u7a0b\u6c60\u7684\u5de5\u4f5c\u7ebf\u7a0b\u53ef\u80fd\u540c\u65f6\u8bbf\u95ee&#xff1a;<\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">AddOnlineUser<\/span><span class=\"token punctuation\">(<\/span>InetAddr addr<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    LockGuard <span class=\"token function\">lockguard<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>_user_mutex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">auto<\/span> <span class=\"token operator\">&amp;<\/span>user <span class=\"token operator\">:<\/span> _online_user<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>addr <span class=\"token operator\">&#061;&#061;<\/span> user<span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5df2\u5728\u5217\u8868\u4e2d&#xff0c;\u4e0d\u91cd\u590d\u6dfb\u52a0<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    _online_user<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">LOG_DEBUG<\/span><span class=\"token punctuation\">(<\/span> <span class=\"token string\">&#034;%s:%d is add to onlineuser list&#8230;&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n           addr<span class=\"token punctuation\">.<\/span><span class=\"token function\">Ip<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><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> addr<span class=\"token punctuation\">.<\/span><span class=\"token function\">Port<\/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>\u6ce8\u610f InetAddr \u589e\u52a0\u4e86 operator&#061;&#061;&#xff0c;\u65b9\u4fbf\u6bd4\u5bf9\u4e24\u4e2a\u7528\u6237\u662f\u5426\u76f8\u540c&#xff1a;<\/p>\n<p><span class=\"token keyword\">bool<\/span> <span class=\"token keyword\">operator<\/span><span class=\"token operator\">&#061;&#061;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> InetAddr <span class=\"token operator\">&amp;<\/span>addr<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">this<\/span><span class=\"token operator\">-&gt;<\/span>_ip <span class=\"token operator\">&#061;&#061;<\/span> addr<span class=\"token punctuation\">.<\/span>_ip <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token operator\">-&gt;<\/span>_port <span class=\"token operator\">&#061;&#061;<\/span> addr<span class=\"token punctuation\">.<\/span>_port<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>4.3 \u6d88\u606f\u5e7f\u64ad Route<\/h4>\n<p>\u6838\u5fc3\u662f Route \u51fd\u6570\u2014\u2014\u904d\u5386\u5728\u7ebf\u7528\u6237\u5217\u8868&#xff0c;\u7ed9\u6bcf\u4eba\u53d1\u4e00\u4efd&#xff1a;<\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">Route<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> sock<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string <span class=\"token operator\">&amp;<\/span>message<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    LockGuard <span class=\"token function\">lockguard<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>_user_mutex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">auto<\/span> <span class=\"token operator\">&amp;<\/span>user <span class=\"token operator\">:<\/span> _online_user<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">sendto<\/span><span class=\"token punctuation\">(<\/span>sock<span class=\"token punctuation\">,<\/span> message<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> message<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><br \/>\n               <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>user<span class=\"token punctuation\">.<\/span><span class=\"token function\">GetAddr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>user<span class=\"token punctuation\">.<\/span><span class=\"token function\">GetAddr<\/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><br \/>\n        <span class=\"token function\">LOG_DEBUG<\/span><span class=\"token punctuation\">(<\/span> <span class=\"token string\">&#034;server send message to %s:%d, message: %s&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n               user<span class=\"token punctuation\">.<\/span><span class=\"token function\">Ip<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><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> user<span class=\"token punctuation\">.<\/span><span class=\"token function\">Port<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> message<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><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>InetAddr \u4e5f\u589e\u52a0\u4e86 GetAddr() \u65b9\u6cd5&#xff0c;\u8fd4\u56de\u4fdd\u5b58\u7684 sockaddr_in \u5f15\u7528&#xff0c;\u65b9\u4fbf sendto \u76f4\u63a5\u4f7f\u7528\u3002<\/p>\n<p>Start() \u4e3b\u5faa\u73af\u4e0e V1\/V2 \u7684\u533a\u522b\u2014\u2014\u5c06\u8f6c\u53d1\u4efb\u52a1\u63d0\u4ea4\u5230\u7ebf\u7a0b\u6c60&#xff1a;<\/p>\n<p><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>defaultsize<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">for<\/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><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 n <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><br \/>\n                             <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>n <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            InetAddr <span class=\"token function\">addr<\/span><span class=\"token punctuation\">(<\/span>peer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">AddOnlineUser<\/span><span class=\"token punctuation\">(<\/span>addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ \u767b\u8bb0\u4e0a\u7ebf<\/span><br \/>\n            buffer<span class=\"token punctuation\">[<\/span>n<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u62fc\u63a5\u6d88\u606f&#xff1a;[IP:Port]# \u5185\u5bb9<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>string message <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;[&#034;<\/span> <span class=\"token operator\">&#043;<\/span> addr<span class=\"token punctuation\">.<\/span><span class=\"token function\">Ip<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;:&#034;<\/span> <span class=\"token operator\">&#043;<\/span> std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">to_string<\/span><span class=\"token punctuation\">(<\/span>addr<span class=\"token punctuation\">.<\/span><span class=\"token function\">Port<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;]# &#034;<\/span> <span class=\"token operator\">&#043;<\/span> buffer<span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u5c06\u5e7f\u64ad\u4efb\u52a1\u63d0\u4ea4\u5230\u7ebf\u7a0b\u6c60&#xff0c;\u4e3b\u7ebf\u7a0b\u7acb\u5373\u56de\u5230 recvfrom \u7ee7\u7eed\u6536\u6d88\u606f<\/span><br \/>\n            task_t task <span class=\"token operator\">&#061;<\/span> std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>UdpServer<span class=\"token double-colon punctuation\">::<\/span>Route<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">,<\/span> _sockfd<span class=\"token punctuation\">,<\/span> message<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">ThreadPool<\/span><span class=\"token operator\">&lt;<\/span>task_t<span class=\"token operator\">&gt;<\/span><span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">GetInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">-&gt;<\/span><span class=\"token function\">Push<\/span><span class=\"token punctuation\">(<\/span>task<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 punctuation\">}<\/span><\/p>\n<p>\u4e3a\u4ec0\u4e48\u7528\u7ebf\u7a0b\u6c60\u800c\u4e0d\u662f\u5728 recvfrom \u5faa\u73af\u91cc\u76f4\u63a5 Route&#xff1f; \u5982\u679c\u67d0\u6b21 sendto \u963b\u585e&#xff08;\u7f51\u7edc\u62e5\u585e\u6216\u63a5\u6536\u65b9\u7f13\u51b2\u533a\u6ee1&#xff09;&#xff0c;\u4e3b\u5faa\u73af\u505c\u987f&#xff0c;\u6240\u6709\u5176\u4ed6\u7528\u6237\u7684\u6d88\u606f\u90fd\u6536\u4e0d\u5230\u4e86\u3002\u7ebf\u7a0b\u6c60\u5c06\u8f6c\u53d1\u5f02\u6b65\u5316&#xff0c;\u4e3b\u7ebf\u7a0b\u6c38\u8fdc\u53ea\u8d1f\u8d23 recvfrom&#xff0c;\u8f6c\u53d1\u4ea4\u7ed9\u5de5\u4f5c\u7ebf\u7a0b\u5e76\u884c\u6267\u884c\u3002<\/p>\n<h4>4.4 \u591a\u7ebf\u7a0b\u5ba2\u6237\u7aef<\/h4>\n<p>V3 \u7684\u5ba2\u6237\u7aef\u4e5f\u5347\u7ea7\u4e86\u2014\u2014UDP \u662f\u5168\u53cc\u5de5\u7684&#xff0c;\u7528\u4e00\u4e2a socket \u540c\u65f6\u6536\u53d1\u4e0d\u4f1a\u51b2\u7a81&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u4e24\u4e2a\u72ec\u7acb\u7ebf\u7a0b&#xff1a;\u4e00\u4e2a\u53ea\u7ba1\u53d1&#xff0c;\u4e00\u4e2a\u53ea\u7ba1\u6536<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">SenderRoutine<\/span><span class=\"token punctuation\">(<\/span>ThreadData <span class=\"token operator\">&amp;<\/span>td<span class=\"token punctuation\">)<\/span><br \/>\n<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        std<span class=\"token double-colon punctuation\">::<\/span>string inbuffer<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        std<span class=\"token double-colon punctuation\">::<\/span><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> inbuffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">auto<\/span> server <span class=\"token operator\">&#061;<\/span> td<span class=\"token punctuation\">.<\/span>_serveraddr<span class=\"token punctuation\">.<\/span><span class=\"token function\">GetAddr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">sendto<\/span><span class=\"token punctuation\">(<\/span>td<span class=\"token punctuation\">.<\/span>_sockfd<span class=\"token punctuation\">,<\/span> inbuffer<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> inbuffer<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><br \/>\n               <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><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">RecverRoutine<\/span><span class=\"token punctuation\">(<\/span>ThreadData <span class=\"token operator\">&amp;<\/span>td<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><span class=\"token number\">4096<\/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> temp<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>temp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        ssize_t n <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">recvfrom<\/span><span class=\"token punctuation\">(<\/span>td<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><br \/>\n                             <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>temp<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>n <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> buffer<span class=\"token punctuation\">[<\/span>n<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>cerr <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> <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">break<\/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 comment\">\/\/ main: \u521b\u5efa socket \u2192 \u542f\u52a8\u53d1\u6d88\u606f\u7ebf\u7a0b\u548c\u6536\u6d88\u606f\u7ebf\u7a0b \u2192 Join \u7b49\u5f85<\/span><\/p>\n<p>UDP \u662f\u5168\u53cc\u5de5\u7684&#xff1a; \u4e00\u4e2a sockfd \u53ef\u4ee5\u540c\u65f6\u8bfb\u548c\u5199&#xff0c;\u4e14\u4e0d\u9700\u8981\u50cf TCP \u90a3\u6837\u5148\u5efa\u7acb\u8fde\u63a5\u3002\u4e24\u4e2a\u7ebf\u7a0b\u64cd\u4f5c\u540c\u4e00\u4e2a fd&#xff08;\u4e00\u4e2a\u53ea\u8bfb\u3001\u4e00\u4e2a\u53ea\u5199&#xff09;\u662f\u5b89\u5168\u7684&#xff0c;\u4e0d\u4f1a\u4ea7\u751f\u6570\u636e\u7ade\u4e89\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260725025739-6a6426230b4ce.png\" alt=\"QQ20260526-172129\" \/><\/p>\n<p>\u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u8f93\u5165\u548c\u8f93\u51fa\u7684\u6d88\u606f\u6df7\u5728\u4e86\u4e00\u8d77&#xff0c;\u770b\u7740\u4e0d\u662f\u5f88\u7f8e\u89c2&#xff0c;\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u6307\u4ee4\u5c06\u8f93\u51fa\u7684\u6d88\u606f\u548c\u8f93\u5165\u7684\u6d88\u606f\u5206\u5f00&#xff0c;\u8fd9\u6837\u5c31\u4e0d\u5f71\u54cd\u53d1\u6d88\u606f\u548c\u6536\u5230\u7684\u6d88\u606f\u6df7\u6742\u5728\u4e00\u8d77\u3002<\/p>\n<h3>\u4e94\u3001\u8865\u5145&#xff1a;\u5730\u5740\u8f6c\u6362\u51fd\u6570<\/h3>\n<p>UDP \u7f16\u7a0b\u4e2d\u9891\u7e41\u6d89\u53ca\u5b57\u7b26\u4e32 IP \u2194 32 \u4f4d\u6574\u6570\u7684\u8f6c\u6362&#xff0c;\u9009\u62e9\u6b63\u786e\u7684\u5de5\u5177\u51fd\u6570\u5f88\u91cd\u8981\u3002<\/p>\n<h4>5.1 \u51fd\u6570\u5bf9\u6bd4<\/h4>\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;arpa\/inet.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5b57\u7b26\u4e32 \u2192 \u4e8c\u8fdb\u5236&#xff08;\u63a8\u8350&#xff09;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">inet_pton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> af<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>src<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>dst<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/   af:  \u5730\u5740\u65cf \u2014 AF_INET(IPv4) \/ AF_INET6(IPv6)<\/span><br \/>\n<span class=\"token comment\">\/\/   src: \u70b9\u5206\u5341\u8fdb\u5236\u5b57\u7b26\u4e32&#xff0c;\u5982 &#034;192.168.1.1&#034;<\/span><br \/>\n<span class=\"token comment\">\/\/   dst: \u8f93\u51fa\u53c2\u6570&#xff0c;\u6307\u5411 in_addr(IPv4) \u6216 in6_addr(IPv6)<\/span><br \/>\n<span class=\"token comment\">\/\/   \u8fd4\u56de\u503c: \u6210\u529f 1&#xff0c;src \u683c\u5f0f\u65e0\u6548 0&#xff0c;\u5931\u8d25 -1<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4e8c\u8fdb\u5236 \u2192 \u5b57\u7b26\u4e32&#xff08;\u63a8\u8350&#xff09;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span><span class=\"token function\">inet_ntop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> af<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>src<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>dst<span class=\"token punctuation\">,<\/span> socklen_t size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/   src:  \u6307\u5411 in_addr \u6216 in6_addr<\/span><br \/>\n<span class=\"token comment\">\/\/   dst:  \u8c03\u7528\u8005\u63d0\u4f9b\u7684\u8f93\u51fa\u7f13\u51b2\u533a<\/span><br \/>\n<span class=\"token comment\">\/\/   size: \u7f13\u51b2\u533a\u5927\u5c0f(INET_ADDRSTRLEN&#061;16 \/ INET6_ADDRSTRLEN&#061;46)<\/span><br \/>\n<span class=\"token comment\">\/\/   \u8fd4\u56de\u503c: \u6210\u529f\u8fd4\u56de dst \u6307\u9488&#xff0c;\u5931\u8d25\u8fd4\u56de NULL<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5b57\u7b26\u4e32 \u2192 \u4e8c\u8fdb\u5236&#xff08;\u65e7\u7248&#xff0c;\u4e0d\u63a8\u8350&#xff09;<\/span><br \/>\nin_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><br \/>\n<span class=\"token comment\">\/\/   \u8fd4\u56de\u503c: \u6210\u529f\u8fd4\u56de 32 \u4f4d\u7f51\u7edc\u5b57\u8282\u5e8f\u5730\u5740&#xff0c;\u5931\u8d25\u8fd4\u56de INADDR_NONE(-1)<\/span><br \/>\n<span class=\"token comment\">\/\/   \u81f4\u547d\u7f3a\u9677: \u5408\u6cd5\u5730\u5740 255.255.255.255 \u4e0e INADDR_NONE \u51b2\u7a81<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4e8c\u8fdb\u5236 \u2192 \u5b57\u7b26\u4e32&#xff08;\u65e7\u7248&#xff0c;\u4e0d\u63a8\u8350&#xff09;<\/span><br \/>\n<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><br \/>\n<span class=\"token comment\">\/\/   \u8fd4\u56de\u503c: \u6307\u5411\u51fd\u6570\u5185\u90e8\u9759\u6001\u7f13\u51b2\u533a\u7684\u6307\u9488&#xff08;\u7ebf\u7a0b\u4e0d\u5b89\u5168&#xff01;&#xff09;<\/span><\/p>\n<table>\n<tr>\u51fd\u6570\u65b9\u5411\u652f\u6301 IPv6\u7ebf\u7a0b\u5b89\u5168\u63a8\u8350<\/tr>\n<tbody>\n<tr>\n<td>inet_pton<\/td>\n<td>\u5b57\u7b26\u4e32 \u2192 \u4e8c\u8fdb\u5236<\/td>\n<td>\u2705<\/td>\n<td>\u2705<\/td>\n<td>\u2705<\/td>\n<\/tr>\n<tr>\n<td>inet_ntop<\/td>\n<td>\u4e8c\u8fdb\u5236 \u2192 \u5b57\u7b26\u4e32<\/td>\n<td>\u2705<\/td>\n<td>\u2705<\/td>\n<td>\u2705<\/td>\n<\/tr>\n<tr>\n<td>inet_addr<\/td>\n<td>\u5b57\u7b26\u4e32 \u2192 \u4e8c\u8fdb\u5236<\/td>\n<td>\u274c<\/td>\n<td>\u2705<\/td>\n<td>\u274c<\/td>\n<\/tr>\n<tr>\n<td>inet_ntoa<\/td>\n<td>\u4e8c\u8fdb\u5236 \u2192 \u5b57\u7b26\u4e32<\/td>\n<td>\u274c<\/td>\n<td>\u274c<\/td>\n<td>\u274c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>5.2 inet_ntoa \u7684\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898<\/h4>\n<p>inet_ntoa \u8fd4\u56de\u4e00\u4e2a char*&#xff0c;\u6307\u5411\u51fd\u6570\u5185\u90e8\u7684\u9759\u6001\u7f13\u51b2\u533a\u3002\u591a\u6b21\u8c03\u7528\u4f1a\u4e92\u76f8\u8986\u76d6&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u95ee\u9898\u6f14\u793a<\/span><br \/>\n<span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> ptr1 <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">inet_ntoa<\/span><span class=\"token punctuation\">(<\/span>addr1<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ ptr1 \u6307\u5411\u9759\u6001\u533a<\/span><br \/>\n<span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> ptr2 <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">inet_ntoa<\/span><span class=\"token punctuation\">(<\/span>addr2<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ ptr2 \u4e5f\u6307\u5411\u540c\u4e00\u9759\u6001\u533a<\/span><br \/>\n<span class=\"token comment\">\/\/ \u6b64\u65f6 ptr1 \u7684\u5185\u5bb9\u5df2\u7ecf\u88ab ptr2 \u8986\u76d6&#xff01;<\/span><\/p>\n<p>\u591a\u7ebf\u7a0b\u573a\u666f\u4e0b\u95ee\u9898\u66f4\u4e25\u91cd\u2014\u2014\u4e24\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8c03\u7528 inet_ntoa&#xff0c;\u8bfb\u53d6\u5230\u5bf9\u65b9\u7684\u8f6c\u6362\u7ed3\u679c&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260725025739-6a6426231e8d5.png\" alt=\"QQ20260520-221023\" \/><\/p>\n<p><span class=\"token comment\">\/\/ \u591a\u7ebf\u7a0b\u6d4b\u8bd5 inet_ntoa<\/span><br \/>\n<span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">Func1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span> p<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><span class=\"token operator\">*<\/span> addr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>p<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <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\">char<\/span><span class=\"token operator\">*<\/span> ptr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">inet_ntoa<\/span><span class=\"token punctuation\">(<\/span>addr<span class=\"token operator\">-&gt;<\/span>sin_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u53ef\u80fd\u62ff\u5230 Func2 \u7684\u7ed3\u679c<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;addr1: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> ptr<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\">void<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">Func2<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span> p<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><span class=\"token operator\">*<\/span> addr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>p<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <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\">char<\/span><span class=\"token operator\">*<\/span> ptr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">inet_ntoa<\/span><span class=\"token punctuation\">(<\/span>addr<span class=\"token operator\">-&gt;<\/span>sin_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u53ef\u80fd\u62ff\u5230 Func1 \u7684\u7ed3\u679c<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;addr2: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> ptr<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>\u6700\u4f73\u5b9e\u8df5&#xff1a;\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b&#xff0c;\u7edf\u4e00\u4f7f\u7528 inet_ntop&#xff0c;\u7531\u8c03\u7528\u8005\u63d0\u4f9b\u7f13\u51b2\u533a\u3002 \u8fd9\u6837\u6bcf\u4e2a\u7ebf\u7a0b\u6709\u81ea\u5df1\u72ec\u7acb\u7684\u5185\u5b58\u7a7a\u95f4&#xff0c;\u4e0d\u5b58\u5728\u7ade\u6001\u95ee\u9898\u3002inet_pton \u540c\u7406&#xff0c;\u4f18\u4e8e inet_addr\u3002<\/p>\n<h3>\u516d\u3001\u5e38\u89c1\u95ee\u9898\u4e0e\u907f\u5751\u6307\u5357<\/h3>\n<p>\u4ee5\u4e0b\u662f UDP Socket \u7f16\u7a0b\u4e2d\u6700\u5bb9\u6613\u8e29\u7684\u5751&#xff0c;\u63d0\u524d\u77e5\u9053\u80fd\u7701\u4e0d\u5c11\u8c03\u8bd5\u65f6\u95f4&#xff1a;<\/p>\n<h4>6.1 \u5fd8\u8bb0 htons() \u5bfc\u81f4\u7aef\u53e3\u53f7\u9519\u4e71<\/h4>\n<p>\u73b0\u8c61&#xff1a; \u670d\u52a1\u5668\u7ed1\u5b9a 8080 \u7aef\u53e3&#xff0c;\u5ba2\u6237\u7aef\u8fde\u4e0d\u4e0a&#xff1b;\u7528 netstat \u67e5\u770b\u53d1\u73b0\u76d1\u542c\u5728\u4e00\u4e2a\u5947\u602a\u7684\u7aef\u53e3\u4e0a\u3002<\/p>\n<p>\u539f\u56e0&#xff1a; 8080 \u5728\u5c0f\u7aef\u673a\u5668\u4e0a\u7684\u5185\u5b58\u5e03\u5c40\u662f 0x901f0000&#xff08;\u4e3b\u673a\u5e8f&#xff09;&#xff0c;\u76f4\u63a5\u586b\u5165 sin_port \u540e&#xff0c;\u7f51\u7edc\u5e8f\u4e0b\u88ab\u89e3\u8bfb\u4e3a 0x00001f90 &#061; 8080 \u5417&#xff1f;\u4e0d\u5bf9&#xff0c;\u5b9e\u9645\u662f\u5b57\u8282\u53cd\u8f6c\u540e\u7684\u5176\u4ed6\u503c\u3002<\/p>\n<p>\u89e3\u51b3&#xff1a; \u5199\u5165 sockaddr_in \u7684\u7aef\u53e3\u53f7\u548c IP \u5730\u5740\u5fc5\u987b\u901a\u8fc7 htons()\/htonl() \u8f6c\u6362\u3002\u8bfb\u53d6\u65f6\u5fc5\u987b\u901a\u8fc7 ntohs()\/ntohl() \u8f6c\u56de\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u274c \u9519\u8bef<\/span><br \/>\nlocal<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">8080<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2705 \u6b63\u786e<\/span><br \/>\nlocal<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><\/p>\n<h4>6.2 recvfrom \u7684 addrlen \u53c2\u6570\u672a\u521d\u59cb\u5316<\/h4>\n<p>\u73b0\u8c61&#xff1a; recvfrom \u8fd4\u56de -1&#xff0c;errno \u4e3a EINVAL&#xff08;\u65e0\u6548\u53c2\u6570&#xff09;\u3002<\/p>\n<p>\u539f\u56e0&#xff1a; addrlen \u662f\u8f93\u5165\u8f93\u51fa\u53c2\u6570\u2014\u2014\u4f20\u5165\u65f6\u5fc5\u987b\u7b49\u4e8e\u5730\u5740\u7ed3\u6784\u4f53\u7684\u5927\u5c0f&#xff0c;recvfrom \u5185\u90e8\u636e\u6b64\u5224\u65ad\u7f13\u51b2\u533a\u662f\u5426\u8db3\u591f\u3002<\/p>\n<p>\u89e3\u51b3&#xff1a; \u6bcf\u6b21\u8c03\u7528\u524d\u90fd\u8981\u8d4b\u503c&#xff1a;<\/p>\n<p>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>  <span class=\"token comment\">\/\/ \u5fc5\u987b\u5728\u6bcf\u6b21 recvfrom \u524d\u91cd\u65b0\u8d4b\u503c<\/span><br \/>\n<span class=\"token function\">recvfrom<\/span><span class=\"token punctuation\">(<\/span>sockfd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> size<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><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>peer<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>6.3 \u5ba2\u6237\u7aef bind \u4e86\u56fa\u5b9a\u7aef\u53e3\u5bfc\u81f4\u591a\u5b9e\u4f8b\u51b2\u7a81<\/h4>\n<p>\u73b0\u8c61&#xff1a; \u540c\u4e00\u53f0\u673a\u5668\u53ea\u80fd\u542f\u52a8\u4e00\u4e2a\u5ba2\u6237\u7aef\u5b9e\u4f8b&#xff0c;\u7b2c\u4e8c\u4e2a\u542f\u52a8\u65f6\u62a5 Address already in use\u3002<\/p>\n<p>\u539f\u56e0&#xff1a; \u624b\u52a8 bind \u7aef\u53e3\u540e&#xff0c;\u8be5\u7aef\u53e3\u88ab\u72ec\u5360\u3002\u5ba2\u6237\u7aef\u7aef\u53e3\u672c\u5e94\u8ba9 OS \u968f\u673a\u5206\u914d&#xff0c;\u652f\u6301\u4efb\u610f\u591a\u4e2a\u5b9e\u4f8b\u3002<\/p>\n<p>\u89e3\u51b3&#xff1a; \u5ba2\u6237\u7aef\u4e0d\u8981\u663e\u5f0f bind()\u3002sendto() \u9996\u6b21\u8c03\u7528\u65f6 OS \u4f1a\u81ea\u52a8\u5206\u914d\u53ef\u7528\u7aef\u53e3\u3002<\/p>\n<h4>6.4 inet_ntoa \u591a\u7ebf\u7a0b\u4e0b\u8fd4\u56de\u9519\u8bef IP<\/h4>\n<p>\u73b0\u8c61&#xff1a; \u5728\u591a\u7ebf\u7a0b\u7a0b\u5e8f\u4e2d\u6253\u5370\u5ba2\u6237\u7aef IP&#xff0c;\u5076\u5c14\u51fa\u73b0 IP \u5bf9\u4e0d\u4e0a\u7684\u60c5\u51b5\u3002<\/p>\n<p>\u539f\u56e0&#xff1a; inet_ntoa \u8fd4\u56de\u7684\u662f\u5185\u90e8\u9759\u6001\u7f13\u51b2\u533a\u7684\u6307\u9488&#xff0c;\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u8c03\u7528\u65f6\u4f1a\u8986\u76d6\u4e0a\u4e00\u7ebf\u7a0b\u7684\u7ed3\u679c\u3002<\/p>\n<p>\u89e3\u51b3&#xff1a; \u4f7f\u7528\u53ef\u91cd\u5165\u7684 inet_ntop&#xff0c;\u7531\u8c03\u7528\u8005\u63d0\u4f9b\u7f13\u51b2\u533a&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u274c \u591a\u7ebf\u7a0b\u4e0d\u5b89\u5168<\/span><br \/>\n<span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> 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><\/p>\n<p><span class=\"token comment\">\/\/ \u2705 \u7ebf\u7a0b\u5b89\u5168<\/span><br \/>\n<span class=\"token keyword\">char<\/span> ip<span class=\"token punctuation\">[<\/span>INET_ADDRSTRLEN<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">inet_ntop<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>peer<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">,<\/span> ip<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>ip<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>6.5 sendto \u8fd4\u56de -1 \u4f46\u4e0d\u4ee3\u8868\u5bf9\u65b9\u6ca1\u6536\u5230<\/h4>\n<p>\u73b0\u8c61&#xff1a; sendto \u8fd4\u56de -1&#xff08;\u6bd4\u5982 ENETUNREACH&#xff09;&#xff0c;\u4f46\u5b9e\u9645\u4e0a\u5bf9\u65b9\u53ef\u80fd\u5df2\u7ecf\u6536\u5230\u4e86\u6570\u636e\u3002<\/p>\n<p>\u539f\u56e0&#xff1a; UDP \u662f\u65e0\u8fde\u63a5\u534f\u8bae&#xff0c;sendto \u53ea\u8d1f\u8d23\u5c06\u6570\u636e\u63d0\u4ea4\u5230\u672c\u5730\u534f\u8bae\u6808\u7684\u53d1\u9001\u961f\u5217&#xff0c;\u8fd4\u56de -1 \u901a\u5e38\u8868\u793a\u672c\u5730\u53d1\u9001\u5931\u8d25&#xff08;\u5982\u8def\u7531\u4e0d\u53ef\u8fbe&#xff09;&#xff0c;\u4e0d\u4ee3\u8868\u5bf9\u65b9\u6536\u6ca1\u6536\u5230\u3002<\/p>\n<p>\u89e3\u51b3&#xff1a; sendto \u6210\u529f \u2260 \u5bf9\u65b9\u6536\u5230&#xff1b;sendto \u5931\u8d25 \u2260 \u5bf9\u65b9\u6ca1\u6536\u5230\u3002\u771f\u6b63\u9700\u8981\u53ef\u9760\u6027\u7684\u573a\u666f&#xff0c;\u5e94\u8be5\u9009\u7528 TCP \u6216\u5728\u5e94\u7528\u5c42\u5b9e\u73b0\u786e\u8ba4\u673a\u5236\u3002<\/p>\n<hr \/>\n<h3>\u516d\u3001UDP \u670d\u52a1\u5668\u751f\u4ea7\u90e8\u7f72\u6ce8\u610f\u4e8b\u9879<\/h3>\n<p>\u524d\u9762\u4e09\u4e2a\u7248\u672c\u7684\u4ee3\u7801\u5b8c\u6210\u5ea6\u5df2\u7ecf\u8db3\u591f\u5b66\u4e60\u539f\u7406&#xff0c;\u4f46\u79bb\u751f\u4ea7\u73af\u5883\u8fd8\u5dee\u51e0\u6b65\u3002\u4ee5\u4e0b\u662f UDP \u670d\u52a1\u5668\u5728\u771f\u5b9e\u90e8\u7f72\u4e2d\u7684\u5e38\u89c1\u95ee\u9898\u548c\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<h4>6.1 \u53d1\u9001\u901f\u7387\u63a7\u5236\u2014\u2014\u907f\u514d&#034;\u6d2a\u6cdb&#034;\u4e22\u5305<\/h4>\n<p>UDP \u6ca1\u6709\u62e5\u585e\u63a7\u5236&#xff0c;\u4f60\u53ef\u4ee5\u7528 sendto \u4ee5\u4efb\u610f\u901f\u7387\u53d1\u9001\u6570\u636e\u3002\u4f46\u5982\u679c\u53d1\u9001\u901f\u7387\u8d85\u8fc7\u4e86\u63a5\u6536\u65b9\u7684\u5904\u7406\u80fd\u529b\u6216\u4e2d\u95f4\u8def\u7531\u5668\u7684\u5e26\u5bbd&#xff0c;\u6570\u636e\u62a5\u5c31\u4f1a\u88ab\u9759\u9ed8\u4e22\u5f03\u3002\u5b9e\u9645\u90e8\u7f72\u4e2d\u5e94\u8be5\u5b9e\u73b0\u5e94\u7528\u5c42\u7684\u901f\u7387\u63a7\u5236&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u7b80\u5355\u7684\u901f\u7387\u9650\u5236\u5668\u2014\u2014\u6bcf\u79d2\u6700\u591a\u53d1 rate_limit \u4e2a\u5305<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">RateLimiter<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> _rate_limit<span class=\"token punctuation\">;<\/span>          <span class=\"token comment\">\/\/ \u6bcf\u79d2\u6700\u591a\u53d1\u5305\u6570<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> _tokens<span class=\"token punctuation\">;<\/span>              <span class=\"token comment\">\/\/ \u5f53\u524d\u4ee4\u724c\u6570<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>chrono<span class=\"token double-colon punctuation\">::<\/span>steady_clock<span class=\"token double-colon punctuation\">::<\/span>time_point _last_refill<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">RateLimiter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> rate<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span> <span class=\"token function\">_rate_limit<\/span><span class=\"token punctuation\">(<\/span>rate<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">_tokens<\/span><span class=\"token punctuation\">(<\/span>rate<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        _last_refill <span class=\"token operator\">&#061;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>chrono<span class=\"token double-colon punctuation\">::<\/span>steady_clock<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">now<\/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>    <span class=\"token keyword\">bool<\/span> <span class=\"token function\">AllowSend<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">auto<\/span> now <span class=\"token operator\">&#061;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>chrono<span class=\"token double-colon punctuation\">::<\/span>steady_clock<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">now<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">auto<\/span> elapsed <span class=\"token operator\">&#061;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>chrono<span class=\"token double-colon punctuation\">::<\/span><span class=\"token generic-function\"><span class=\"token function\">duration<\/span><span class=\"token generic class-name\"><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">double<\/span><span class=\"token operator\">&gt;<\/span><\/span><\/span><span class=\"token punctuation\">(<\/span>now <span class=\"token operator\">&#8211;<\/span> _last_refill<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">count<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        _tokens <span class=\"token operator\">&#061;<\/span> std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">min<\/span><span class=\"token punctuation\">(<\/span>_rate_limit<span class=\"token punctuation\">,<\/span> _tokens <span class=\"token operator\">&#043;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span>elapsed <span class=\"token operator\">*<\/span> _rate_limit<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        _last_refill <span class=\"token operator\">&#061;<\/span> now<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>_tokens <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> _tokens<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u4ee4\u724c\u7528\u5b8c&#xff0c;\u5e94\u8be5\u7b49\u5f85<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u7528\u6cd5&#xff1a;\u53d1\u9001\u524d\u8c03\u7528 AllowSend()&#xff0c;true \u624d sendto<\/span><\/p>\n<h4>6.2 \u91cd\u4f20\u548c\u8d85\u65f6\u5904\u7406\u2014\u2014\u5e94\u7528\u5c42\u7684\u53ef\u9760\u6027\u8865\u507f<\/h4>\n<p>UDP \u672c\u8eab\u4e0d\u91cd\u4f20&#xff0c;\u4f46\u4f60\u7684\u4e1a\u52a1\u53ef\u80fd\u9700\u8981\u3002\u5178\u578b\u7684\u505a\u6cd5\u662f&#xff1a;\u5e8f\u5217\u53f7 &#043; \u5b9a\u65f6\u5668\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u53d1\u9001\u7aef&#xff1a;\u7ed9\u6bcf\u4e2a\u6570\u636e\u62a5\u7f16\u53f7<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">UdpPacket<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">uint32_t<\/span> seq<span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/ \u5e8f\u5217\u53f7<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> data<span class=\"token punctuation\">[<\/span><span class=\"token number\">1472<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/ \u8f7d\u8377&#xff08;MTU \u53cb\u597d\u5c3a\u5bf8&#xff09;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u63a5\u6536\u7aef&#xff1a;\u68c0\u67e5\u5e8f\u5217\u53f7&#xff0c;\u53d1\u73b0\u7f3a\u5931\u540e\u8bf7\u6c42\u91cd\u4f20<\/span><br \/>\nstd<span class=\"token double-colon punctuation\">::<\/span>set<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">uint32_t<\/span><span class=\"token operator\">&gt;<\/span> received_seqs<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">OnReceive<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> UdpPacket <span class=\"token operator\">&amp;<\/span>pkt<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>received_seqs<span class=\"token punctuation\">.<\/span><span class=\"token function\">count<\/span><span class=\"token punctuation\">(<\/span>pkt<span class=\"token punctuation\">.<\/span>seq<span class=\"token punctuation\">)<\/span> <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        received_seqs<span class=\"token punctuation\">.<\/span><span class=\"token function\">insert<\/span><span class=\"token punctuation\">(<\/span>pkt<span class=\"token punctuation\">.<\/span>seq<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u68c0\u67e5\u662f\u5426\u6709\u7f3a\u5931&#8230;\u5982\u679c\u7f3a\u4e86&#xff0c;\u53d1 NACK \u8bf7\u6c42\u91cd\u4f20<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd9\u4e2a\u601d\u8def\u548c TCP \u7684\u786e\u8ba4\u5e94\u7b54\u3001\u8d85\u65f6\u91cd\u4f20\u5982\u51fa\u4e00\u8f99\u2014\u2014\u53ea\u4e0d\u8fc7 TCP \u5728\u5185\u6838\u5c42\u505a\u4e86\u8fd9\u4e00\u5207&#xff0c;\u800c\u4f60\u8981\u5728\u5e94\u7528\u5c42\u505a\u3002QUIC \u534f\u8bae&#xff08;HTTP\/3 \u7684\u5e95\u5c42&#xff09;\u4e5f\u662f\u8fd9\u6837\u5728 UDP \u4e4b\u4e0a\u91cd\u5efa\u4e86\u53ef\u9760\u6027\u673a\u5236&#xff0c;\u4f46\u505a\u5f97\u6bd4 TCP \u66f4\u7cbe\u7ec6\u2014\u2014\u89e3\u51b3\u4e86 TCP \u7684\u961f\u5934\u963b\u585e\u95ee\u9898\u3002<\/p>\n<h4>6.3 \u8d1f\u8f7d\u5747\u8861\u2014\u2014\u591a\u8fdb\u7a0b bind \u540c\u4e00\u7aef\u53e3<\/h4>\n<p>UDP \u670d\u52a1\u7aef\u4e5f\u53ef\u4ee5\u7528\u591a\u8fdb\u7a0b\u63d0\u5347\u5e76\u53d1\u80fd\u529b&#xff08;\u548c TCP V2 \u591a\u8fdb\u7a0b\u7c7b\u4f3c&#xff09;&#xff0c;\u7ed3\u5408 SO_REUSEPORT&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> opt <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">setsockopt<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span> SOL_SOCKET<span class=\"token punctuation\">,<\/span> SO_REUSEPORT<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><\/p>\n<p><span class=\"token comment\">\/\/ fork \u591a\u4e2a\u5de5\u4f5c\u8fdb\u7a0b<\/span><br \/>\n<span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> num_workers<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">fork<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <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 comment\">\/\/ \u5b50\u8fdb\u7a0b&#xff1a;\u7ee7\u7eed bind \u540c\u4e00\u7aef\u53e3&#xff0c;\u5185\u6838\u6309\u54c8\u5e0c\u5206\u53d1\u6570\u636e\u62a5\u5230\u5404\u8fdb\u7a0b<\/span><br \/>\n        <span class=\"token function\">StartWorker<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">exit<\/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 punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>UDP \u7684 SO_REUSEPORT \u5206\u53d1\u6bd4 TCP \u66f4\u81ea\u7136\u2014\u2014\u6bcf\u4e2a\u6570\u636e\u62a5\u90fd\u662f\u72ec\u7acb\u7684&#xff0c;\u5185\u6838\u53ef\u4ee5\u72ec\u7acb\u5206\u53d1\u800c\u4e0d\u9700\u8981\u8003\u8651\u8fde\u63a5\u72b6\u6001\u3002\u8fd9\u4f7f\u5f97 UDP \u7684\u6c34\u5e73\u6269\u5c55\u6bd4 TCP \u7b80\u5355\u3002<\/p>\n<h4>6.4 \u76d1\u63a7\u6307\u6807\u2014\u2014\u54ea\u4e9b\u6570\u636e\u5e94\u8be5\u8bb0\u5f55<\/h4>\n<table>\n<tr>\u6307\u6807\u542b\u4e49\u91c7\u96c6\u65b9\u5f0f<\/tr>\n<tbody>\n<tr>\n<td>\u63a5\u6536\u6570\u636e\u62a5\u603b\u6570<\/td>\n<td>recvfrom \u6210\u529f\u6b21\u6570<\/td>\n<td>\u6bcf\u6b21 recvfrom &gt; 0 \u8ba1\u6570\u5668 &#043;1<\/td>\n<\/tr>\n<tr>\n<td>\u53d1\u9001\u6570\u636e\u62a5\u603b\u6570<\/td>\n<td>sendto \u6210\u529f\u6b21\u6570<\/td>\n<td>\u6bcf\u6b21 sendto &gt; 0 \u8ba1\u6570\u5668 &#043;1<\/td>\n<\/tr>\n<tr>\n<td>\u63a5\u6536\u5931\u8d25\u6b21\u6570<\/td>\n<td>recvfrom \u8fd4\u56de -1 \u7684\u6b21\u6570<\/td>\n<td>\u6bcf\u6b21 recvfrom &lt; 0 \u8ba1\u6570\u5668 &#043;1<\/td>\n<\/tr>\n<tr>\n<td>\u6d3b\u8dc3\u7528\u6237\u6570<\/td>\n<td>\u5728\u7ebf\u7528\u6237\u5217\u8868\u5927\u5c0f<\/td>\n<td>_online_user.size()<\/td>\n<\/tr>\n<tr>\n<td>\u6d88\u606f\u5904\u7406\u5ef6\u8fdf<\/td>\n<td>\u4ece\u6536\u5230\u5230\u53d1\u51fa\u5e7f\u64ad\u7684\u65f6\u95f4\u5dee<\/td>\n<td>chrono \u8ba1\u65f6<\/td>\n<\/tr>\n<tr>\n<td>\u63a5\u6536\u7f13\u51b2\u533a\u4e22\u5305<\/td>\n<td>\u5185\u6838 RcvbufErrors<\/td>\n<td>\u8bfb\u53d6 \/proc\/net\/snmp<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u76d1\u63a7\u662f\u8fd0\u7ef4\u7684\u773c\u775b\u3002\u5982\u679c\u7528\u6237\u53cd\u9988&#034;\u6d88\u606f\u7ecf\u5e38\u6536\u4e0d\u5230&#034;&#xff0c;\u4f60\u7b2c\u4e00\u53cd\u5e94\u662f\u53bb\u67e5\u63a5\u6536\u7f13\u51b2\u533a\u4e22\u5305\u6307\u6807\u2014\u2014\u800c\u4e0d\u662f\u731c\u4ee3\u7801\u54ea\u91cc\u5199\u9519\u4e86\u3002<\/p>\n<hr \/>\n<h3>\u603b\u7ed3<\/h3>\n<p>\u4ece V1 \u5230 V3 \u7684\u6f14\u8fdb&#xff0c;\u672c\u8d28\u4e0a\u662f\u4e00\u5957\u7f51\u7edc\u6846\u67b6\u7684\u8fed\u4ee3\u601d\u8def&#xff1a;<\/p>\n<table>\n<tr>\u7248\u672c\u529f\u80fd\u6838\u5fc3\u5347\u7ea7<\/tr>\n<tbody>\n<tr>\n<td>V1 Echo<\/td>\n<td>\u56de\u663e\u670d\u52a1\u5668<\/td>\n<td>\u638c\u63e1 socket\/bind\/recvfrom\/sendto \u57fa\u672c\u6d41\u7a0b<\/td>\n<\/tr>\n<tr>\n<td>V2 DictServer<\/td>\n<td>\u82f1\u8bd1\u6c49\u5b57\u5178<\/td>\n<td>\u7528\u56de\u8c03\u51fd\u6570\u5206\u79bb\u7f51\u7edc\u4ee3\u7801\u4e0e\u4e1a\u52a1\u903b\u8f91<\/td>\n<\/tr>\n<tr>\n<td>V3 ChatRoom<\/td>\n<td>\u591a\u7ebf\u7a0b\u804a\u5929\u5ba4<\/td>\n<td>\u5f15\u5165\u7ebf\u7a0b\u6c60\u5f02\u6b65\u5904\u7406 &#043; \u5728\u7ebf\u7528\u6237\u7ba1\u7406 &#043; \u5e7f\u64ad<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>\u52a8\u624b\u8bd5\u8bd5<\/h4>\n<li>\u5728 V1 Echo \u670d\u52a1\u5668\u57fa\u7840\u4e0a&#xff0c;\u6539\u5199 Start() 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