{"id":74210,"date":"2026-02-09T12:09:08","date_gmt":"2026-02-09T04:09:08","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/74210.html"},"modified":"2026-02-09T12:09:08","modified_gmt":"2026-02-09T04:09:08","slug":"%e7%bd%91%e7%bb%9c%e7%bc%96%e7%a8%8b%ef%bc%9audp%e7%bd%91%e7%bb%9c%e5%a5%97%e6%8e%a5%e5%ad%97%e7%ae%80%e5%8d%95%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/74210.html","title":{"rendered":"\u7f51\u7edc\u7f16\u7a0b\uff1aUDP\u7f51\u7edc\u5957\u63a5\u5b57\u7b80\u5355\u4f7f\u7528"},"content":{"rendered":"<h2><span style=\"color:#494949\">\u8ba4\u8bc6\u7aef\u53e3\u53f7<\/span><\/h2>\n<p><span style=\"color:#494949\">\u7aef\u53e3\u53f7\u662f\u7528\u4e8e\u5728\u7f51\u7edc\u4f20\u8f93\u8fc7\u7a0b\u4e2d\u6807\u8bc6\u8fdb\u7a0b\u7684\u4e00\u4e2a\u6570\u503c\u3002<\/span><\/p>\n<ul>\n<li><span style=\"color:#494949\">\u7aef\u53e3\u53f7(port)\u662f\u4f20\u8f93\u5c42\u534f\u8bae\u7684\u5185\u5bb9. <\/span><\/li>\n<li><span style=\"color:#494949\">\u7aef\u53e3\u53f7\u662f\u4e00\u4e2a2\u5b57\u828216\u4f4d\u7684\u6574\u6570; <\/span><\/li>\n<li><span style=\"color:#494949\">\u7aef\u53e3\u53f7\u7528\u6765\u6807\u8bc6\u4e00\u4e2a\u8fdb\u7a0b, \u544a\u8bc9\u64cd\u4f5c\u7cfb\u7edf, \u5f53\u524d\u7684\u8fd9\u4e2a\u6570\u636e\u8981\u4ea4\u7ed9\u54ea\u4e00\u4e2a\u8fdb\u7a0b\u6765\u5904\u7406; <\/span><\/li>\n<li><span style=\"color:#494949\">IP\u5730\u5740 &#043; \u7aef\u53e3\u53f7\u80fd\u591f\u6807\u8bc6\u7f51\u7edc\u4e0a\u7684\u67d0\u4e00\u53f0\u4e3b\u673a\u7684\u67d0\u4e00\u4e2a\u8fdb\u7a0b; <\/span><\/li>\n<li><span style=\"color:#494949\">\u4e00\u4e2a\u7aef\u53e3\u53f7\u53ea\u80fd\u88ab\u4e00\u4e2a\u8fdb\u7a0b\u5360\u7528<\/span><\/li>\n<\/ul>\n<p><span style=\"color:#494949\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5373\u4f7f\u6211\u4eec\u7684\u8fdb\u7a0bpid\u4e5f\u53ef\u4ee5\u6807\u8bc6\u552f\u4e00\u7684\u8fdb\u7a0b&#xff0c;\u4f46\u662f\u6211\u4eec\u4ecd\u7136\u9700\u8981\u4e00\u4e2a\u7aef\u53e3\u53f7&#xff0c;\u8fd9\u6837\u7684\u76ee\u7684\u662f\u7531\u4e8e\u7aef\u53e3\u53f7\u8fd0\u7528\u4e8e\u7f51\u7edc\u7f16\u7a0b&#xff0c;\u800c\u6211\u4eec\u8fdb\u7a0bpid\u4e3b\u8981\u5728\u4e8e\u6211\u4eecOS\u5185\u90e8&#xff0c;\u53ef\u4ee5\u5c06\u6211\u4eec\u7684\u7f51\u7edc\u7f16\u7a0b\u548c\u64cd\u4f5c\u7cfb\u7edf\u8fdb\u884c\u89e3\u8026\u3002<\/span><\/p>\n<p><span style=\"color:#494949\">\u00a0 \u00a0 \u00a0 \u00a0 \u5728TCP\u534f\u8bae\u4e2d&#xff0c;\u6211\u4eec\u7684\u662f\u5229\u7528\u4e00\u4e2ahash\u8868\u5b58\u50a8\u7684\u6211\u4eec\u7684\u8fdb\u7a0bPCB&#xff0c;\u5c06\u7aef\u53e3\u53f7\u7ecf\u8fc7hash\u51fd\u6570\u627e\u5230\u786e\u5b9a\u7684\u4f4d\u7f6e\u3002<\/span><\/p>\n<p><span style=\"color:#494949\">\u4e00\u4e2a\u8fdb\u7a0b\u53ef\u4ee5\u7ed1\u5b9a\u591a\u4e2a\u7aef\u53e3\u53f7; \u4f46\u662f\u4e00\u4e2a\u7aef\u53e3\u53f7\u4e0d\u80fd\u88ab\u591a\u4e2a\u8fdb\u7a0b\u7ed1\u5b9a<\/span><\/p>\n<h2><span style=\"color:#494949\">\u7f51\u7edc\u5b57\u8282\u5e8f <\/span><\/h2>\n<p><span style=\"color:#494949\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6211\u4eec\u5df2\u7ecf\u77e5\u9053,\u5185\u5b58\u4e2d\u7684\u591a\u5b57\u8282\u6570\u636e\u76f8\u5bf9\u4e8e\u5185\u5b58\u5730\u5740\u6709\u5927\u7aef\u548c\u5c0f\u7aef\u4e4b\u5206, \u78c1\u76d8\u6587\u4ef6\u4e2d\u7684\u591a\u5b57\u8282\u6570\u636e\u76f8\u5bf9\u4e8e\u6587\u4ef6\u4e2d\u7684\u504f\u79fb\u5730\u5740\u4e5f\u6709\u5927\u7aef\u5c0f\u7aef\u4e4b\u5206, \u7f51\u7edc\u6570\u636e\u6d41\u540c\u6837\u6709\u5927\u7aef\u5c0f\u7aef\u4e4b\u5206. \u90a3\u4e48\u5982\u4f55\u5b9a\u4e49\u7f51\u7edc\u6570\u636e\u6d41\u7684\u5730\u5740\u5462? <\/span><\/p>\n<ul>\n<li><span style=\"color:#494949\">\u53d1\u9001\u4e3b\u673a\u901a\u5e38\u5c06\u53d1\u9001\u7f13\u51b2\u533a\u4e2d\u7684\u6570\u636e\u6309\u5185\u5b58\u5730\u5740\u4ece\u4f4e\u5230\u9ad8\u7684\u987a\u5e8f\u53d1\u51fa; <\/span><\/li>\n<li><span style=\"color:#494949\">\u63a5\u6536\u4e3b\u673a\u628a\u4ece\u7f51\u7edc\u4e0a\u63a5\u5230\u7684\u5b57\u8282\u4f9d\u6b21\u4fdd\u5b58\u5728\u63a5\u6536\u7f13\u51b2\u533a\u4e2d,\u4e5f\u662f\u6309\u5185\u5b58\u5730\u5740\u4ece\u4f4e\u5230\u9ad8\u7684\u987a\u5e8f\u4fdd\u5b58; <\/span><\/li>\n<li><span style=\"color:#494949\">\u56e0\u6b64,\u7f51\u7edc\u6570\u636e\u6d41\u7684\u5730\u5740\u5e94\u8fd9\u6837\u89c4\u5b9a:\u5148\u53d1\u51fa\u7684\u6570\u636e\u662f\u4f4e\u5730\u5740,\u540e\u53d1\u51fa\u7684\u6570\u636e\u662f\u9ad8\u5730\u5740. <\/span><\/li>\n<li><span style=\"color:#494949\">TCP\/IP\u534f\u8bae\u89c4\u5b9a,\u7f51\u7edc\u6570\u636e\u6d41\u5e94\u91c7\u7528\u5927\u7aef\u5b57\u8282\u5e8f,\u5373\u4f4e\u5730\u5740\u9ad8\u5b57\u8282. <\/span><\/li>\n<li><span style=\"color:#494949\">\u4e0d\u7ba1\u8fd9\u53f0\u4e3b\u673a\u662f\u5927\u7aef\u673a\u8fd8\u662f\u5c0f\u7aef\u673a, \u90fd\u4f1a\u6309\u7167\u8fd9\u4e2aTCP\/IP\u89c4\u5b9a\u7684\u7f51\u7edc\u5b57\u8282\u5e8f\u6765\u53d1\u9001\/\u63a5\u6536\u6570\u636e; <\/span><\/li>\n<li><span style=\"color:#494949\">\u5982\u679c\u5f53\u524d\u53d1\u9001\u4e3b\u673a\u662f\u5c0f\u7aef, \u5c31\u9700\u8981\u5148\u5c06\u6570\u636e\u8f6c\u6210\u5927\u7aef; \u5426\u5219\u5c31\u5ffd\u7565, \u76f4\u63a5\u53d1\u9001\u5373\u53ef<\/span><\/li>\n<\/ul>\n<p><span style=\"color:#494949\">\u4e3a\u4f7f\u7f51\u7edc\u7a0b\u5e8f\u5177\u6709\u53ef\u79fb\u690d\u6027,\u4f7f\u540c\u6837\u7684C\u4ee3\u7801\u5728\u5927\u7aef\u548c\u5c0f\u7aef\u8ba1\u7b97\u673a\u4e0a\u7f16\u8bd1\u540e\u90fd\u80fd\u6b63\u5e38\u8fd0\u884c,\u53ef\u4ee5\u8c03\u7528\u4ee5\u4e0b\u5e93\u51fd\u6570\u505a\u7f51\u7edc\u5b57\u8282\u5e8f\u548c\u4e3b\u673a\u5b57\u8282\u5e8f\u7684\u8f6c\u6362<\/span><\/p>\n<p><span style=\"color:#494949\"><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"161\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260209040906-69895de2f2297.png\" width=\"941\" \/><\/span><\/p>\n<ul>\n<li><span style=\"color:#494949\">\u8fd9\u4e9b\u51fd\u6570\u540d\u5f88\u597d\u8bb0,h\u8868\u793ahost,n\u8868\u793anetwork,l\u8868\u793a32\u4f4d\u957f\u6574\u6570,s\u8868\u793a16\u4f4d\u77ed\u6574\u6570\u3002 <\/span><\/li>\n<li><span style=\"color:#494949\">\u4f8b\u5982htonl\u8868\u793a\u5c0632\u4f4d\u7684\u957f\u6574\u6570\u4ece\u4e3b\u673a\u5b57\u8282\u5e8f\u8f6c\u6362\u4e3a\u7f51\u7edc\u5b57\u8282\u5e8f,\u4f8b\u5982\u5c06IP\u5730\u5740\u8f6c\u6362\u540e\u51c6\u5907\u53d1\u9001\u3002 <\/span><\/li>\n<li><span style=\"color:#494949\">\u5982\u679c\u4e3b\u673a\u662f\u5c0f\u7aef\u5b57\u8282\u5e8f,\u8fd9\u4e9b\u51fd\u6570\u5c06\u53c2\u6570\u505a\u76f8\u5e94\u7684\u5927\u5c0f\u7aef\u8f6c\u6362\u7136\u540e\u8fd4\u56de <\/span><\/li>\n<li><span style=\"color:#494949\">\u5982\u679c\u4e3b\u673a\u662f\u5927\u7aef\u5b57\u8282\u5e8f,\u8fd9\u4e9b \u51fd\u6570\u4e0d\u505a\u8f6c\u6362,\u5c06\u53c2\u6570\u539f\u5c01\u4e0d\u52a8\u5730\u8fd4\u56de\u3002<\/span><\/li>\n<\/ul>\n<h2><span style=\"color:#494949\">UDP_socket\u7f16\u7a0b<\/span><\/h2>\n<h3><span style=\"color:#494949\">sockaddr\u7ed3\u6784<\/span><\/h3>\n<p><span style=\"color:#494949\">socket API\u662f\u4e00\u5c42\u62bd\u8c61\u7684\u7f51\u7edc\u7f16\u7a0b\u63a5\u53e3,\u9002\u7528\u4e8e\u5404\u79cd\u5e95\u5c42\u7f51\u7edc\u534f\u8bae,\u5982IPv4\u3001IPv6,\u4ee5\u53ca\u540e\u9762\u8981\u8bb2\u7684UNIX DomainSocket. \u7136\u800c, \u5404\u79cd\u7f51\u7edc\u534f\u8bae\u7684\u5730\u5740\u683c\u5f0f\u5e76\u4e0d\u76f8\u540c<\/span><\/p>\n<p><span style=\"color:#494949\"><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"912\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260209040907-69895de319641.png\" width=\"810\" \/><\/span><\/p>\n<ul>\n<li><span style=\"color:#494949\">IPv4\u548cIPv6\u7684\u5730\u5740\u683c\u5f0f\u5b9a\u4e49\u5728netinet\/in.h\u4e2d,IPv4\u5730\u5740\u7528sockaddr_in\u7ed3\u6784\u4f53\u8868\u793a,\u5305\u62ec16\u4f4d\u5730\u5740\u7c7b\u578b, 16\u4f4d\u7aef\u53e3\u53f7\u548c32\u4f4dIP\u5730\u5740. <\/span><\/li>\n<li><span style=\"color:#494949\">IPv4\u3001IPv6\u5730\u5740\u7c7b\u578b\u5206\u522b\u5b9a\u4e49\u4e3a\u5e38\u6570AF_INET\u3001AF_INET6. \u8fd9\u6837,\u53ea\u8981\u53d6\u5f97\u67d0\u79cdsockaddr\u7ed3\u6784\u4f53\u7684\u9996\u5730\u5740,\u4e0d\u9700\u8981\u77e5\u9053\u5177\u4f53\u662f\u54ea\u79cd\u7c7b\u578b\u7684sockaddr\u7ed3\u6784\u4f53,\u5c31\u53ef\u4ee5\u6839\u636e\u5730\u5740\u7c7b\u578b\u5b57\u6bb5\u786e\u5b9a\u7ed3\u6784\u4f53\u4e2d\u7684\u5185\u5bb9. <\/span><\/li>\n<li><span style=\"color:#494949\">socket API\u53ef\u4ee5\u90fd\u7528struct sockaddr *\u7c7b\u578b\u8868\u793a, \u5728\u4f7f\u7528\u7684\u65f6\u5019\u9700\u8981\u5f3a\u5236\u8f6c\u5316\u6210sockaddr_in; \u8fd9\u6837\u7684\u597d\u5904\u662f\u7a0b\u5e8f\u7684\u901a\u7528\u6027, \u53ef\u4ee5\u63a5\u6536IPv4, IPv6, \u4ee5\u53caUNIX Domain Socket\u5404\u79cd\u7c7b\u578b\u7684sockaddr\u7ed3\u6784\u4f53\u6307\u9488\u505a\u4e3a\u53c2\u6570;<\/span><\/li>\n<\/ul>\n<p>sockaddr\u7ed3\u6784<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"199\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260209040907-69895de3571dd.png\" width=\"1349\" \/><\/p>\n<p><span style=\"color:#333333\">sockaddr_in <\/span><span style=\"color:#333333\">\u7ed3\u6784<\/span><\/p>\n<p><span style=\"color:#333333\">\u867d\u7136socket api\u7684\u63a5\u53e3\u662f<\/span><span style=\"color:#333333\">sockaddr, <\/span><span style=\"color:#333333\">\u4f46\u662f\u6211\u4eec\u771f\u6b63\u5728\u57fa\u4e8e<\/span><span style=\"color:#333333\">IPv4<\/span><span style=\"color:#333333\">\u7f16\u7a0b\u65f6<\/span><span style=\"color:#333333\">, <\/span><span style=\"color:#333333\">\u4f7f\u7528\u7684\u6570\u636e\u7ed3\u6784<\/span><span style=\"color:#333333\">sockaddr_in; <\/span><span style=\"color:#333333\">\u8fd9\u4e2a\u7ed3\u6784\u91cc\u4e3b\u8981\u6709\u4e09\u90e8\u5206\u4fe1\u606f: <\/span><span style=\"color:#333333\">\u5730\u5740\u7c7b\u578b<\/span><span style=\"color:#333333\">, <\/span><span style=\"color:#333333\">\u7aef\u53e3\u53f7<\/span><span style=\"color:#333333\">, IP<\/span><span style=\"color:#333333\">\u5730\u5740<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"491\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260209040907-69895de375803.png\" width=\"1265\" \/><\/p>\n<p>in_addr\u7ed3\u6784<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"175\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260209040907-69895de3acced.png\" width=\"875\" \/><\/p>\n<h3><span style=\"color:#494949\">\u4f7f\u7528API\u4ecb\u7ecd<\/span><\/h3>\n<p><span style=\"color:#494949\">socket<\/span><\/p>\n<\/p>\n<p><span style=\"color:#494949\">#include &lt;sys\/types.h&gt;\u00a0 \u00a0\u00a0<br \/>\n#include &lt;sys\/socket.h&gt;<\/span><\/p>\n<p><span style=\"color:#494949\">int socket(int domain, int type, int protocol)<\/span><\/p>\n<p><span style=\"color:#494949\">\u529f\u80fd&#xff1a;\u521b\u5efasocket\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><\/p>\n<p><span style=\"color:#494949\">\u53c2\u6570&#xff1a;<\/span><\/p>\n<p><span style=\"color:#494949\">\u00a0 \u00a0 \u00a0 \u00a0 domain&#xff1a;AF_INET \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 IPv4 Internet protocols\u00a0<\/span><\/p>\n<p><span style=\"color:#494949\">\u00a0 \u00a0 \u00a0 \u00a0 type&#xff1a;\u00a0SOCK_DGRAM \u00a0 \u00a0 \u00a0Supports datagrams \u00a0(connectionless, \u00a0unreliable \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0messages of a fixed maximum length).<\/span><\/p>\n<p><span style=\"color:#494949\">\u00a0 \u00a0 \u00a0 \u00a0 protocol&#xff1a;0<\/span><\/p>\n<p><span style=\"color:#494949\">bind<\/span><\/p>\n<p><span style=\"color:#494949\">#include &lt;sys\/types.h&gt;\u00a0 \u00a0 \u00a0 \u00a0\u00a0<\/span><\/p>\n<p><span style=\"color:#494949\">#include &lt;sys\/socket.h&gt;<\/span><\/p>\n<p><span style=\"color:#494949\">int bind(int sockfd, const struct sockaddr *addr, socklen_t addrlen);<\/span><\/p>\n<p><span style=\"color:#494949\">\u529f\u80fd&#xff1a;\u7ed1\u5b9a\u7aef\u53e3\u53f7<\/span><\/p>\n<p><span style=\"color:#494949\">\u53c2\u6570&#xff1a;<\/span><\/p>\n<p><span style=\"color:#494949\">\u00a0 \u00a0 \u00a0 \u00a0 sockfd&#xff1a;\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26<br \/>\n\u00a0 \u00a0 \u00a0 \u00a0 addr&#xff1a;\u5f53\u524d\u4e3b\u673a\u4fe1\u606f<\/span><\/p>\n<p><span style=\"color:#494949\">\u00a0 \u00a0 \u00a0 \u00a0 addlen&#xff1a;addr\u7684\u5b57\u8282\u957f\u5ea6<\/span><\/p>\n<p><span style=\"color:#494949\">recvfrom<\/span><\/p>\n<p><span style=\"color:#494949\">#include &lt;sys\/types.h&gt;<\/span><\/p>\n<p><span style=\"color:#494949\">#include &lt;sys\/socket.h&gt;<\/span><\/p>\n<p><span style=\"color:#494949\">\u00a0ssize_t recvfrom(int sockfd, void *buf, size_t len, int flags,<br \/>\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0struct sockaddr *src_addr, socklen_t *addrlen);<\/span><\/p>\n<p><span style=\"color:#494949\">\u529f\u80fd&#xff1a;\u63a5\u6536\u53d1\u9001\u5230\u5f53\u524d\u4e3b\u673a\u7684\u4fe1\u606f<\/span><\/p>\n<p><span style=\"color:#494949\">\u53c2\u6570&#xff1a;<\/span><\/p>\n<p><span style=\"color:#494949\">\u00a0 \u00a0 \u00a0 \u00a0 sockfd&#xff1a;\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><\/p>\n<p><span style=\"color:#494949\">\u00a0 \u00a0 \u00a0 \u00a0 buf&#xff1a;\u6570\u636e\u7f13\u51b2\u533a<\/span><\/p>\n<p><span style=\"color:#494949\">\u00a0 \u00a0 \u00a0 \u00a0 len&#xff1a;\u7f13\u51b2\u533a\u957f\u5ea6<\/span><\/p>\n<p><span style=\"color:#494949\">\u00a0 \u00a0 \u00a0 \u00a0 flags&#xff1a;\u8bbe\u4e3a0&#xff0c;\u963b\u585e\u7b49\u5f85<\/span><\/p>\n<p><span style=\"color:#494949\">\u00a0 \u00a0 \u00a0 \u00a0 src_addr&#xff1a;\u53d1\u9001\u6570\u636e\u7aef\u53e3\u7684\u4e3b\u673a\u4fe1\u606f<\/span><\/p>\n<p><span style=\"color:#494949\">\u00a0 \u00a0 \u00a0 \u00a0 addrlen&#xff1a;src_addr\u7684\u5b57\u8282\u957f\u5ea6<\/span><\/p>\n<p><span style=\"color:#494949\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/p>\n<p><span style=\"color:#494949\">sendto<\/span><\/p>\n<p><span style=\"color:#494949\">\u00a0#include &lt;sys\/types.h&gt;<\/span><\/p>\n<p><span style=\"color:#494949\">#include &lt;sys\/socket.h&gt;<br \/>\nssize_t sendto(int sockfd, const void *buf, size_t len, int flags,<br \/>\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 const struct sockaddr *dest_addr, socklen_t addrlen);<\/span><\/p>\n<p><span style=\"color:#494949\">\u529f\u80fd&#xff1a;\u53d1\u9001\u6d88\u606f<\/span><\/p>\n<p><span style=\"color:#494949\">\u53c2\u6570&#xff1a;<\/span><\/p>\n<p><span style=\"color:#494949\">\u00a0 \u00a0 \u00a0 \u00a0 sockfd&#xff1a;\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><\/p>\n<p><span style=\"color:#494949\">\u00a0 \u00a0 \u00a0 \u00a0 buf&#xff1a;\u7f13\u51b2\u533a<\/span><\/p>\n<p><span style=\"color:#494949\">\u00a0 \u00a0 \u00a0 \u00a0 len&#xff1a;\u7f13\u51b2\u533a\u957f\u5ea6<\/span><\/p>\n<p><span style=\"color:#494949\">\u00a0 \u00a0 \u00a0 \u00a0 flags&#xff1a;\u8bbe\u4e3a0<\/span><\/p>\n<p><span style=\"color:#494949\">\u00a0 \u00a0 \u00a0 \u00a0 dest_addr&#xff1a;\u53d1\u9001\u76ee\u6807\u7684\u4e3b\u673a\u4fe1\u606f<\/span><\/p>\n<p><span style=\"color:#494949\">\u00a0 \u00a0 \u00a0 \u00a0 addr_len&#xff1a;dest_addr\u7684\u5b57\u8282\u957f\u5ea6<\/span><\/p>\n<h3><span style=\"color:#333333\">\u7b80\u5355\u7684<\/span><span style=\"color:#333333\">UDP<\/span><span style=\"color:#333333\">\u7f51\u7edc\u7a0b\u5e8f<\/span><\/h3>\n<p>\u670d\u52a1\u7aef<\/p>\n<p>\u53d8\u91cf\u8bbe\u8ba1&#xff1a;<\/p>\n<p>\u00a0 \u00a0 int sockfd_&#xff1a;\u8bb0\u5f55\u5957\u63a5\u5b57fd<\/p>\n<p>\u00a0 \u00a0 uint16_t port_&#xff1a;\u8bb0\u5f55\u7aef\u53e3\u53f7<\/p>\n<p>\u00a0 \u00a0 string addr_&#xff1a;\u8bb0\u5f55ip\u5730\u5740<\/p>\n<p>\u00a0 \u00a0 bool isrunning&#xff1a;\u662f\u5426\u6b63\u5728\u8fd0\u884c<\/p>\n<p>\u51fd\u6570\u8bbe\u8ba1&#xff1a;<\/p>\n<p>\u6784\u9020\u51fd\u6570<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u521d\u59cb\u5316\u6211\u4eec\u7684\u53d8\u91cf\u5373\u53ef<\/p>\n<p>\u00a0 Udpserver(const uint16_t&amp; port &#061; defaultprot, const string &amp; addr &#061; defaultip) : sockfd_(0), port_(port),addr_(addr), isrunning(false)<\/p>\n<p>\u00a0 \u00a0 {<\/p>\n<p>\u00a0 \u00a0 }<\/p>\n<p>Init \u521d\u59cb\u5316\u51fd\u6570<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0\u00a0\u5728\u8be5\u51fd\u6570\u4e2d&#xff0c;\u6211\u4eec\u9700\u8981\u521b\u5efa\u6211\u4eec\u7684\u7f51\u7edc\u5957\u63a5\u5b57&#xff0c;\u7136\u540e\u5229\u7528sockaddr_in\u7ed3\u6784\u4f20\u5165\u6211\u4eec\u7684\u670d\u52a1\u7aef\u7684ip\u548c\u7aef\u53e3\u7b49\u4fe1\u606f\u3002\u7136\u540e\u5229\u7528bind\u7ed1\u5b9a\u6211\u4eec\u7684\u7aef\u53e3\u53f7\u3002\u5373\u53ef\u5b8c\u6210\u521d\u59cb\u5316\u51fd\u6570<\/p>\n<\/p>\n<p>void Init()<\/p>\n<p>\u00a0 \u00a0 {<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \/\/ 1\u3001\u7f51\u7edc\u5957\u63a5\u5b57<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0sockfd_ &#061; socket(AF_INET, SOCK_DGRAM, 0);<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 if (sockfd_ &lt; 0)<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 {<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 lg(Fatal, &#034;socket create error, sockfd: %d&#034;, sockfd_);<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 exit(SOCKET_ERR);<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 lg(Info, &#034;socket create success, sockfd: %d&#034;, sockfd_);<\/p>\n<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \/\/ 2\u3001bind\u7ed1\u5b9a<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 struct sockaddr_in local;<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 bzero(&amp;local, sizeof(local));\/\/\u5c06local\u6e05\u7a7a\u4e00\u4e0b<\/p>\n<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 local.sin_family &#061; AF_INET; \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \/\/ \u57df<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 local.sin_addr.s_addr &#061; inet_addr(addr_.c_str()); \/\/ \u975e\u96f6\u6807\u8bc6\u53ef\u4ee5\u63a5\u6536\u8be5\u4e3b\u673a\u4efb\u610fIP\u63a5\u6536\u7684\u6570\u636e\u62a5&#xff0c;\u6307\u5b9a\u5219\u53ea\u80fd\u63a5\u6536\u5bf9\u5e94IP<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 local.sin_port &#061; htons(port_); \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\/\/ \u7aef\u53e3\u8f6c\u4e3a\u7f51\u7edc\u5b57\u8282\u5e8f<\/p>\n<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 if (bind(sockfd_, (struct sockaddr *)&amp;local, sizeof(local)) &lt; 0)<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 {<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 lg(Fatal, &#034;bind error, errno: %d, err string: %s&#034;, errno, strerror(errno));<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 exit(BIND_ERR);<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 lg(Info, &#034;bind sucess, errno: %d, err string: %s&#034;, errno, strerror(errno));<\/p>\n<p>\u00a0 \u00a0 }<\/p>\n<p>Run \u8fd0\u884c\u51fd\u6570<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u5b8c\u6210\u521d\u59cb\u5316\u540e&#xff0c;\u6211\u4eec\u8fdb\u884c\u8fd0\u884c\u6211\u4eec\u7684\u670d\u52a1\u5668&#xff0c;\u9996\u5148\u9700\u8981\u63a5\u6536\u6765\u81ea\u5ba2\u6237\u7aef\u7684\u6d88\u606f\u548c\u5ba2\u6237\u7aef\u7684\u4e3b\u673a\u4fe1\u606f&#xff08;ip&#xff0c;\u7aef\u53e3\u53f7\u7b49&#xff09;&#xff0c;\u9700\u8981\u53d1\u9001\u7ed9\u5ba2\u6237\u7aef\u65f6\u53ea\u9700\u8981\u5229\u7528\u6211\u4eec\u63a5\u6536\u65f6\u7684sockadd_in\u7ed3\u6784\u5373\u53ef<\/p>\n<p>void Run()<\/p>\n<p>\u00a0 \u00a0 {<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 isrunning &#061; true;<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 char inbuffer[size];<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 while (isrunning)<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 {<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \/\/\u63a5\u6536\u5ba2\u6237\u7aef\u6d88\u606f<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 struct sockaddr_in client;\/\/\u63a5\u6536\u6765\u81ea\u5ba2\u6237\u7aef\u7684\u4e3b\u673a\u4fe1\u606f<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 socklen_t len &#061; sizeof(client);<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 ssize_t n &#061; recvfrom(sockfd_, inbuffer, sizeof(inbuffer)-1, 0, (struct sockaddr *)&amp;client, &amp;len);<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if (n &lt; 0)<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 {<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 lg(Warning, &#034;recvfrom error, errno: %d, err string: %s&#034;, errno, strerror(errno));<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 continue;<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 inbuffer[n]&#061; 0;<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 cout&lt;&lt;inbuffer&lt;&lt;endl;<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \/\/\u8fd4\u56de\u6d88\u606f\u7ed9\u5ba2\u6237\u7aef<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 string info &#061; inbuffer;<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 string retstr &#061; &#034;Server say&#064;: &#034;&#043;info;<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 sendto(sockfd_,retstr.c_str(),retstr.size(),0,(struct sockaddr*)&amp;client,len);<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n<p>\u00a0 \u00a0 }<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8ba4\u8bc6\u7aef\u53e3\u53f7\u7aef\u53e3\u53f7\u662f\u7528\u4e8e\u5728\u7f51\u7edc\u4f20\u8f93\u8fc7\u7a0b\u4e2d\u6807\u8bc6\u8fdb\u7a0b\u7684\u4e00\u4e2a\u6570\u503c\u3002\u7aef\u53e3\u53f7(port)\u662f\u4f20\u8f93\u5c42\u534f\u8bae\u7684\u5185\u5bb9. \u7aef\u53e3\u53f7\u662f\u4e00\u4e2a2\u5b57\u828216\u4f4d\u7684\u6574\u6570; \u7aef\u53e3\u53f7\u7528\u6765\u6807\u8bc6\u4e00\u4e2a\u8fdb\u7a0b, \u544a\u8bc9\u64cd\u4f5c\u7cfb\u7edf, \u5f53\u524d\u7684\u8fd9\u4e2a\u6570\u636e\u8981\u4ea4\u7ed9\u54ea\u4e00\u4e2a\u8fdb\u7a0b\u6765\u5904\u7406; IP\u5730\u5740  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