{"id":25222,"date":"2025-04-19T12:03:07","date_gmt":"2025-04-19T04:03:07","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/25222.html"},"modified":"2025-04-19T12:03:07","modified_gmt":"2025-04-19T04:03:07","slug":"%e7%bd%91%e7%bb%9c%e7%bc%96%e7%a8%8b%e5%a5%97%e6%8e%a5%e5%ad%97%ef%bc%88%e4%ba%8c%ef%bc%89%e4%b9%8budp%e6%9c%8d%e5%8a%a1%e5%99%a8%e7%ae%80%e5%8d%95%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/25222.html","title":{"rendered":"\u7f51\u7edc\u7f16\u7a0b\u5957\u63a5\u5b57\uff08\u4e8c\uff09\u4e4bUDP\u670d\u52a1\u5668\u7b80\u5355\u5b9e\u73b0"},"content":{"rendered":"

\u76ee\u5f55<\/p>\n

\n

\u4e00\u3001\u670d\u52a1\u7aefUdpServer<\/p>\n

1\u3001udp_server.hpp<\/p>\n

1\u3001\u670d\u52a1\u5668\u7684\u521d\u59cb\u5316<\/p>\n

2\u3001\u670d\u52a1\u5668\u7684\u8fd0\u884c<\/p>\n

2\u3001udp_server.cc<\/p>\n

\u4e8c\u3001\u5ba2\u6237\u7aefUdpClient<\/p>\n

udp_client.cc<\/p>\n

\u4e09\u3001\u5b8c\u6574\u4ee3\u7801<\/p>\n

\n

\u4e00\u3001\u670d\u52a1\u7aefUdpServer<\/h2>\n

1\u3001udp_server.hpp<\/h3>\n

\u9996\u5148，\u6211\u4eec\u5728\u8be5\u6587\u4ef6\u4e2d，\u5c06\u670d\u52a1\u5668\u5c01\u88c5\u6210\u4e00\u4e2a\u7c7b，\u800c\u4f5c\u4e3a\u4e00\u6b3e\u670d\u52a1\u5668，\u5fc5\u987b\u8981\u6709\u81ea\u5df1\u7684\u7aef\u53e3\u53f7，\u540c\u65f6\u7f51\u7edc\u670d\u52a1\u5668\u9700\u8981\u6709\u5bf9\u5e94\u7684IP\u5730\u5740，\u6587\u4ef6\u63cf\u8ff0\u7b26sock_：\u8fdb\u884c\u5404\u79cd\u5404\u6837\u7684\u6570\u636e\u901a\u4fe1，\u5728\u7c7b\u5185\u8fdb\u884c\u8bfb\u5199\u64cd\u4f5c\u3002\u7136\u540e\u5bf9\u5916\u63d0\u4f9b\u521d\u59cb\u5316\u548c\u8fd0\u884c\u7684\u63a5\u53e3\u3002<\/p>\n

1\u3001\u670d\u52a1\u5668\u7684\u521d\u59cb\u5316<\/h4>\n

\u6211\u4eec\u6700\u5f00\u59cb\u9700\u8981\u5148\u5c06\u5b83\u8fdb\u884c\u521d\u59cb\u5316\u3002\u521d\u59cb\u5316\u7684\u7b2c\u4e00\u6b65\u5c31\u662f\u521b\u5efa\u5957\u63a5\u5b57，\u800c\u521b\u5efa\u5957\u63a5\u5b57\u6211\u4eec\u9700\u8981\u7528\u5230\u4e0b\u9762\u7684\u51fd\u6570\u3002<\/p>\n

socket：\u5176\u4f5c\u7528\u5c31\u662f\u521b\u5efa\u5957\u63a5\u5b57\u3002<\/p>\n

NAME
\n socket – create an endpoint for communication<\/p>\n

SYNOPSIS
\n #include <sys\/types.h> \/* See NOTES *\/
\n #include <sys\/socket.h><\/p>\n

int socket(int domain, int type, int protocol); <\/p>\n

\u53c2\u6570\u8bf4\u660e：<\/p>\n

~ domain：\u57df，\u7528\u6765\u8868\u660e\u5957\u63a5\u5b57\u662f\u8fdb\u884c\u7f51\u7edc\u901a\u4fe1\u8fd8\u662f\u672c\u5730\u901a\u4fe1，\u4e3b\u8981\u4f7f\u7528\u4e0b\u9762\u8fd9\u4e24\u79cd ：AF_UNIX（\u672c\u5730\u901a\u4fe1）\u00a0 \u00a0AF_INET（\u7f51\u7edc\u901a\u4fe1）\u3002<\/p>\n

~ type：\u521b\u5efa\u5957\u63a5\u5b57\u65f6\u6240\u9700\u7684\u670d\u52a1\u7c7b\u578b\u3002\u5176\u4e2d\u6700\u5e38\u4f7f\u7528\u7684\u662fSOCK_STREAM\u548cSOCK_DGRAM\u3002\u5982：UDP\u662f\u6570\u636e\u62a5\u7684\u7f51\u7edc\u901a\u4fe1\u5f62\u5f0f，\u6211\u4eec\u91c7\u7528\u7684\u5c31\u662fSOCK_DGRAM（\u7528\u6237\u6570\u636e\u62a5\u670d\u52a1），TCP\u662f\u9762\u5411\u5b57\u8282\u6d41\u5f0f\u7684\u7f51\u7edc\u901a\u4fe1，\u6211\u4eec\u91c7\u7528\u7684\u5c31\u662fSOCK_STREAM（\u53eb\u505a\u6d41\u5f0f\u5957\u63a5\u5b57，\u63d0\u4f9b\u7684\u662f\u6d41\u5f0f\u670d\u52a1）\u3002<\/p>\n

~ protocol：\u521b\u5efa\u5957\u63a5\u5b57\u7684\u534f\u8bae\u7c7b\u522b\u3002\u8be5\u5b57\u6bb5\u4e00\u822c\u76f4\u63a5\u8bbe\u7f6e\u4e3a0\u5c31\u53ef\u4ee5\u4e86，\u8bbe\u7f6e\u4e3a0\u8868\u793a\u7684\u5c31\u662f\u9ed8\u8ba4，\u6b64\u65f6\u4f1a\u6839\u636e\u4f20\u5165\u7684\u524d\u4e24\u4e2a\u53c2\u6570\u81ea\u52a8\u63a8\u5bfc\u51fa\u4f60\u6700\u7ec8\u9700\u8981\u4f7f\u7528\u7684\u662f\u54ea\u79cd\u534f\u8bae\u3002<\/p>\n

~ \u8fd4\u56de\u503c：\u5957\u63a5\u5b57\u521b\u5efa\u6210\u529f\u8fd4\u56de\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26，\u521b\u5efa\u5931\u8d25\u8fd4\u56de-1，\u540c\u65f6\u9519\u8bef\u7801\u4f1a\u88ab\u8bbe\u7f6e\u3002<\/p>\n

\u521d\u59cb\u5316\u7684\u7b2c\u4e8c\u6b65\u5c31\u662f\u7ed1\u5b9a\u7aef\u53e3\u53f7\u548cIP，\u6211\u4eec\u9700\u8981\u7528\u5230bind\u51fd\u6570<\/p>\n

NAME
\n bind – bind a name to a socket<\/p>\n

SYNOPSIS
\n #include <sys\/types.h> \/* See NOTES *\/
\n #include <sys\/socket.h><\/p>\n

int bind(int sockfd, const struct sockaddr *addr,
\n socklen_t addrlen); <\/p>\n

\u53c2\u6570\u8bf4\u660e：<\/p>\n

~ sockfd：\u7ed1\u5b9a\u7684\u6587\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002\u4e5f\u5c31\u662f\u6211\u4eec\u521b\u5efa\u5957\u63a5\u5b57\u65f6\u83b7\u53d6\u5230\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/p>\n

~ addr：\u7f51\u7edc\u76f8\u5173\u7684\u5c5e\u6027\u4fe1\u606f，\u5305\u62ec\u534f\u8bae\u5bb6\u65cf\u3001IP\u5730\u5740\u3001\u7aef\u53e3\u53f7\u7b49\u3002<\/p>\n

~ addrlen：\u4f20\u5165\u7684addr\u7ed3\u6784\u4f53\u7684\u957f\u5ea6\u3002\u00a0<\/p>\n

~ \u8fd4\u56de\u503c：\u7ed1\u5b9a\u6210\u529f\u8fd4\u56de0，\u7ed1\u5b9a\u5931\u8d25\u8fd4\u56de-1，\u540c\u65f6\u9519\u8bef\u7801\u4f1a\u88ab\u8bbe\u7f6e\u3002<\/p>\n

\u5728\u7ed1\u5b9a\u65f6\u9700\u8981\u5c06\u670d\u52a1\u5668\u7f51\u7edc\u76f8\u5173\u7684\u5c5e\u6027\u4fe1\u606f\u586b\u5145\u5230\u7ed3\u6784\u4f53struct addr_in\u5f53\u4e2d，\u5176\u7ed3\u6784\u5982\u4e0b：<\/p>\n

\"\"<\/p>\n

\u6211\u4eec\u4e00\u822c\u9700\u8981\u586b\u5145\u4e0b\u9762\u4e09\u4e2a\u6210\u5458：<\/p>\n

sin_family：\u586b\u5145AF_INET\u3002<\/p>\n

sin_port：\u8868\u793a\u670d\u52a1\u5668\u7aef\u53e3\u53f7，\u662f\u4e00\u4e2a16\u4f4d\u7684\u6574\u6570\u3002\u9700\u8981\u6ce8\u610f\u4e3b\u673a\u5e8f\u5217\u548c\u7f51\u7edc\u5e8f\u5217\u7684\u8f6c\u5316\u3002<\/p>\n

sin_addr：\u8868\u793a\u670d\u52a1\u5668IP\u5730\u5740，\u662f\u4e00\u4e2a32\u4f4d\u7684\u6574\u6570\u3002\u6211\u4eec\u53d1\u73b0\u8fd9\u4e2a\u7ed3\u6784\u662f\u4e00\u4e2a\u7ed3\u6784\u4f53，\u6240\u4ee5\u4e00\u822c\u662f\u586b\u5145\u5176\u4e2d\u7684\u6210\u5458：\u662f\u4e00\u4e2a32\u4f4d\u7684\u6574\u6570\u3002<\/p>\n

\"\"<\/p>\n

\u6211\u4eec\u6240\u770b\u5230\u7684IP\u5730\u5740\u662f\u70b9\u5206\u5341\u8fdb\u5236\u7684，\u4f46\u662f\u771f\u6b63\u7684IP\u5730\u5740\u662f\u6574\u6570，\u6240\u4ee5\u6211\u4eec\u5728\u4f7f\u7528\u662f\u9700\u8981\u5c06IP\u5730\u5740\u8f6c\u6362\u6210\u7cfb\u7edf\u80fd\u8bc6\u522b32\u4f4d\u7684\u6574\u6570，\u4e5f\u9700\u8981\u6ce8\u610f\u4e3b\u673a\u5e8f\u5217\u548c\u7f51\u7edc\u5e8f\u5217\u7684\u8f6c\u5316，\u8fd9\u4e9b\u64cd\u4f5c\u6211\u4eec\u4f7f\u7528\u51fd\u6570inet_addr\u53ef\u4ee5\u4e00\u5e76\u5b9e\u73b0\u3002<\/p>\n

#include <sys\/socket.h>
\n#include <netinet\/in.h>
\n#include <arpa\/inet.h><\/p>\n

in_addr_t inet_addr(const char *cp);
\nchar *inet_ntoa(struct in_addr in); <\/p>\n

\u6ce8：\u5b9e\u9645\u4e0a，\u4e00\u6b3e\u7f51\u7edc\u670d\u52a1\u5668\u4e0d\u5efa\u8bae\u6307\u660e\u4e00\u4e2aIP，\u4e5f\u5c31\u662f\u4e0d\u8981\u663e\u793a\u5730\u7ed1\u5b9aIP，\u56e0\u4e3a\u4e00\u4e2a\u670d\u52a1\u5668\u4e0a\u53ef\u80fd\u4f1a\u6709\u591a\u5f20\u7f51\u5361，\u6240\u4ee5IP\u53ef\u80fd\u4e0d\u6b62\u4e00\u4e2a，\u5982\u679c\u53ea\u7ed1\u5b9a\u4e00\u4e2a\u660e\u786e\u7684IP，\u6700\u7ec8\u7684\u6570\u636e\u53ef\u80fd\u7528\u522b\u7684IP\u6765\u8bbf\u95ee\u7aef\u53e3\u53f7，\u8fd9\u5c31\u65e0\u6cd5\u8bbf\u95ee，\u6240\u4ee5\u771f\u5b9e\u7684\u670d\u52a1\u5668IP\u4e00\u822c\u91c7\u7528INADDR_ANY(\u51680，\u4efb\u610f\u5730\u5740)\u4ee3\u8868\u4efb\u610f\u5730\u5740bind\u00a0\u3002<\/p>\n

\u6240\u4ee5\u6211\u4eec\u5728\u586b\u5145IP\u5730\u5740\u65f6\u6700\u597d\u4f7f\u7528INADDR_ANY\u3002<\/p>\n

2\u3001\u670d\u52a1\u5668\u7684\u8fd0\u884c<\/h4>\n

\u9996\u5148，\u4f5c\u4e3a\u4e00\u6b3e\u670d\u52a1\u5668，\u6211\u4eec\u5fc5\u987b\u80fd\u591f\u968f\u65f6\u7ed9\u7528\u6237\u63d0\u4f9b\u670d\u52a1，\u6240\u4ee5\u670d\u52a1\u5668\u662f\u4e00\u4e2a\u4e0d\u80fd\u591f\u9000\u51fa\u7684\u8fdb\u7a0b，\u9700\u8981\u4f7f\u7528\u6b7b\u5faa\u73af\u3002\u7136\u540e\u4e0d\u65ad\u63a5\u6536\u4ece\u5ba2\u6237\u7aef\u53d1\u9001\u8fc7\u6765\u7684\u8bf7\u6c42，\u8fdb\u884c\u5904\u7406，\u5c06\u7ed3\u679c\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\u3002<\/p>\n

\u6211\u4eec\u4e00\u822c\u4f7f\u7528recvform\u51fd\u6570\u63a5\u6536\u5ba2\u6237\u7aef\u53d1\u9001\u8fc7\u6765\u7684\u8bf7\u6c42：<\/p>\n

NAME
\n recv, recvfrom, recvmsg – receive a message from a socket<\/p>\n

SYNOPSIS
\n #include <sys\/types.h>
\n #include <sys\/socket.h><\/p>\n

ssize_t recv(int sockfd, void *buf, size_t len, int flags);<\/p>\n

ssize_t recvfrom(int sockfd, void *buf, size_t len, int flags,
\n struct sockaddr *src_addr, socklen_t *addrlen);<\/p>\n

ssize_t recvmsg(int sockfd, struct msghdr *msg, int flags); <\/p>\n

\u53c2\u6570\u8bf4\u660e：<\/p>\n

sockfd：\u670d\u52a1\u5668\u7ed1\u5b9a\u7684\u5957\u63a5\u5b57，buf：\u8bfb\u53d6\u5230\u7279\u5b9a\u7f13\u51b2\u533a，len：\u7f13\u51b2\u533a\u957f\u5ea6\u3002<\/p>\n

flags：\u8bfb\u53d6\u7684\u65b9\u5f0f，\u9ed8\u8ba4\u4e3a0，\u963b\u585e\u8bfb\u53d6\u3002<\/p>\n

src_addr：\u6536\u5230\u9664\u4e86\u6d88\u606f\u672c\u8eab，\u8fd8\u5f97\u77e5\u9053\u662f\u8c01\u53d1\u7684，\u8f93\u5165\u8f93\u51fa\u578b\u53c2\u6570，\u8fd4\u56de\u5bf9\u5e94\u7684\u6d88\u606f\u5185\u5bb9\u662f\u4ece\u54ea\u4e00\u4e2a\u5ba2\u6237\u7aef\u6765\u7684，len：src_addr\u5927\u5c0f\u3002<\/p>\n

\u8fd4\u56de\u503c：\u8fd4\u56de-1\u8868\u793a\u5931\u8d25，\u6210\u529f\u8fd4\u56de\u5b57\u8282\u6570<\/p>\n

\u670d\u52a1\u5668\u6536\u5230\u6d88\u606f，\u8fdb\u884c\u5904\u7406\u540e，\u6211\u4eec\u9700\u8981\u5c06\u7ed3\u679c\u53d1\u56de\u7ed9\u5ba2\u6237\u7aef，\u6211\u4eec\u4e00\u822c\u4f7f\u7528sendto\u51fd\u6570：<\/p>\n

NAME
\n send, sendto, sendmsg – send a message on a socket<\/p>\n

SYNOPSIS
\n #include <sys\/types.h>
\n #include <sys\/socket.h><\/p>\n

ssize_t send(int sockfd, const void *buf, size_t len, int flags);<\/p>\n

ssize_t sendto(int sockfd, const void *buf, size_t len, int flags,
\n const struct sockaddr *dest_addr, socklen_t addrlen);<\/p>\n

ssize_t sendmsg(int sockfd, const struct msghdr *msg, int flags); <\/p>\n

2\u3001udp_server.cc<\/h3>\n

\u670d\u52a1\u7aef\u8fdb\u884c\u8c03\u7528\u7684\u4ee3\u7801\u903b\u8f91：\u6784\u5efaudpServer\u7684\u5bf9\u8c61，\u7136\u540e\u8fdb\u884c\u521d\u59cb\u5316，\u5728\u8fdb\u884c\u542f\u52a8\u8d77\u6765；\u8c03\u7528\u903b\u8f91\u5982\u4e0b：<\/p>\n

\u56e0\u4e3a\u8fd0\u884c\u540e\u670d\u52a1\u5668\u4f1a\u81ea\u52a8\u7ed1\u5b9a\u6240\u6709\u7684IP，\u6240\u4ee5\u6211\u4eec\u53ea\u9700\u8981\u7ed1\u5b9a\u7aef\u53e3\u53f7\u5373\u53ef\u3002<\/p>\n

#include <iostream>
\n#include "udp_server.hpp"
\n#include <string>
\n#include <memory><\/p>\n

static void usage(const std::string &proc)
\n{
\n std::cout << "\\\\nusage: " << proc << " port\\\\n" << std::endl;
\n}<\/p>\n

\/\/ .\/udpserver port
\nint main(int argc, char *argv[])
\n{
\n if (argc != 2)
\n {
\n usage(argv[0]);
\n exit(0);
\n }
\n uint16_t port = atoi(argv[1]);
\n std::unique_ptr<UdpServer> usvr(new UdpServer(port));
\n usvr->InitServer();
\n usvr->start();<\/p>\n

return 0;
\n} <\/p>\n

\u4e8c\u3001\u5ba2\u6237\u7aefUdpClient<\/h2>\n

udp_client.cc<\/h3>\n

\u5ba2\u6237\u7aef\u8c03\u7528\u65b9\u5f0f：.\/udpClient server_ip server_port，\u5ba2\u6237\u7aef\u60f3\u8fde\u63a5\u670d\u52a1\u5668，\u5fc5\u987b\u5f97\u77e5\u9053\u670d\u52a1\u5668\u7684IP（\u516c\u7f51IP）\u4ee5\u53ca\u7aef\u53e3\u53f7\u3002<\/p>\n

\u5ba2\u6237\u7aef\u7684\u5b9e\u73b0\u65b9\u5f0f：\u521b\u5efa\u5957\u63a5\u5b57，\u53d1\u9001\u8bf7\u6c42\u7ed9\u670d\u52a1\u5668，\u63a5\u6536\u670d\u52a1\u5668\u8fd4\u56de\u7684\u7ed3\u679c\u3002<\/p>\n

\u9700\u8981\u6ce8\u610f\u7684\u662f：\u5728\u670d\u52a1\u7aefbind\u7684\u65f6\u5019，\u6700\u91cd\u8981\u7684\u4e0d\u662f\u7ed1\u5b9aIP，\u800c\u662f\u7ed1\u5b9a\u7aef\u53e3\u53f7，\u670d\u52a1\u5668\u9700\u8981\u663e\u793a\u5730\u7ed1\u5b9a\u7aef\u53e3\u53f7\u662f\u4e3a\u4e86\u5ba2\u6237\u7aef\u672a\u6765\u80fd\u591f\u660e\u786e\u5730\u627e\u5230\u670d\u52a1\u5668\u662f\u5bf9\u5e94\u7684\u670d\u52a1\u7aef\u8fdb\u7a0b，\u4e0d\u80fd\u968f\u610f\u6539\u53d8\u3002<\/p>\n

\u800c\u5ba2\u6237\u7aef\u867d\u7136\u4e5f\u9700\u8981\u7aef\u53e3\u53f7，\u4f46\u662f\u4e0d\u91cd\u8981，\u81ea\u5df1\u542f\u52a8\u540e\u6709\u7aef\u53e3\u53f7\u5c31\u53ef\u4ee5\u4e86，\u4e0d\u9700\u8981\u663e\u793a\u5730\u7ed1\u5b9a\u662f\u54ea\u4e00\u4e2a\u3002\u56e0\u4e3a\u5982\u679c\u4e0d\u540c\u516c\u53f8\u7684\u7a0b\u5e8f\u5458\u5728\u5199\u4e0d\u540c\u8f6f\u4ef6\u5ba2\u6237\u7aef\u65f6，\u7ed1\u5b9a\u4e86\u540c\u4e00\u4e2a\u7aef\u53e3\u53f7\u7684\u8bdd，\u5c31\u4f1a\u53d1\u751f\u51b2\u7a81，\u6240\u4ee5\u6211\u4eec\u5728\u5ba2\u6237\u7aef\u4e0d\u9700\u8981\u7a0b\u5e8f\u5458\u81ea\u5df1\u53bb\u7ed1\u5b9a\u7aef\u53e3\u53f7，\u800c\u662f\u7531\u7cfb\u7edf\u968f\u673a\u5206\u914d\u3002<\/p>\n

\u4e09\u3001\u5b8c\u6574\u4ee3\u7801<\/h2>\n

udp_server.hpp<\/p>\n

#pragma once
\n#include <iostream>
\n#include <sys\/types.h>
\n#include <sys\/socket.h>
\n#include <unistd.h>
\n#include <arpa\/inet.h>
\n#include <netinet\/in.h>
\n#include <stdio.h>
\n#include <cerrno>
\n#include <cstdlib>
\n#include <cstring>
\n#include <string><\/p>\n

class UdpServer
\n{
\npublic:
\n UdpServer(const uint16_t &port, std::string ip = "")
\n : ip_(ip), port_(port), sock_(-1)
\n {
\n }<\/p>\n

void InitServer()
\n {
\n \/\/ 1.\u521b\u5efa\u5957\u63a5\u5b57
\n sock_ = socket(AF_INET, SOCK_DGRAM, 0);
\n if (sock_ < 0)
\n {
\n std::cerr << "\u521b\u5efa\u5957\u63a5\u5b57\u5931\u8d25！" << errno << strerror(errno) << std::endl;
\n exit(0);
\n }<\/p>\n

\/\/ 2.\u8fdb\u884c\u7ed1\u5b9a:\u7ed1\u5b9aip\u548c\u7aef\u53e3\u53f7
\n \/\/ 2.1 \u670d\u52a1\u5668\u7684\u5957\u63a5\u5b57\u586b\u5145\u7ed3\u6784
\n struct sockaddr_in local_server;
\n bzero(&local_server, sizeof(local_server));
\n local_server.sin_family = AF_INET;
\n local_server.sin_port = htons(port_); \/\/ \u7aef\u53e3\u53f7\u9700\u8981\u4ece\u4e3b\u673a\u8f6c\u7f51\u7edc
\n local_server.sin_addr.s_addr = ip_.empty() ? INADDR_ANY : inet_addr(ip_.c_str()); \/\/ ip\u5730\u5740\u9700\u8981\u4e3b\u673a\u8f6c\u7f51\u7edc，\u5e76\u4e14\u8981\u8f6c\u5316\u62104\u5b57\u8282\u5f62\u5f0f
\n int len = sizeof(local_server);
\n if (bind(sock_, (struct sockaddr *)&local_server, len))
\n {
\n std::cout << "\u7ed1\u5b9a\u5931\u8d25！" << errno << strerror(errno) << std::endl;
\n exit(1);
\n }
\n std::cout << "\u670d\u52a1\u5668\u521d\u59cb\u5316\u5b8c\u6210！" << std::endl;
\n }<\/p>\n

void start()
\n {
\n std::cout << "\u670d\u52a1\u5668\u8fd0\u884c\u6210\u529f!" << std::endl;
\n char buffer[1024];
\n char result[1024];
\n std::string server_echo;
\n \/\/ \u670d\u52a1\u5668\u4e0d\u80fd\u505c\u4e0b\u6765，\u9664\u975e\u6302\u6389\u2014\u2014\u6b7b\u5faa\u73af
\n for (;;)
\n {
\n struct sockaddr_in src_client; \/\/ \u670d\u52a1\u5668\u6536\u5230\u7684\u5ba2\u6237\u7aef\u6765\u6e90
\n socklen_t len = sizeof(src_client);
\n ssize_t s = recvfrom(sock_, buffer, sizeof(buffer) – 1, 0, (struct sockaddr *)&src_client, &len);
\n if (s < 0)
\n {
\n std::cout << "\u63a5\u6536\u6d88\u606f\u5931\u8d25！" << std::endl;
\n }
\n buffer[s] = 0;
\n \/\/std::string src_client_ip = inet_ntoa(src_client.sin_addr);
\n \/\/uint16_t src_client_port = ntohs(src_client.sin_port);
\n \/\/std::cout << "[" << src_client_ip << "," << src_client_port << "]: " << buffer << std::endl;<\/p>\n

\/\/ \u5ba2\u6237\u7aef\u53d1\u8fc7\u6765\u7684\u4fe1\u606f\u662f\u6307\u4ee4，\u670d\u52a1\u5668\u5c06\u7ed3\u679c\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef
\n FILE *fp = popen(buffer, "r");
\n if (fp == nullptr)
\n {
\n std::cout << "popen\u5931\u8d25!" << std::endl;
\n continue;
\n }
\n while (fgets(result, sizeof(result), fp) != nullptr)
\n {
\n server_echo += result;
\n }<\/p>\n

\/\/ \u670d\u52a1\u5668\u53d1\u56de\u6d88\u606f
\n sendto(sock_, server_echo.c_str(), server_echo.size(), 0, (struct sockaddr *)&src_client, len);
\n \/\/sendto(sock_, buffer, sizeof(buffer), 0, (struct sockaddr *)&src_client, len);
\n }
\n }<\/p>\n

private:
\n std::string ip_; \/\/ \u670d\u52a1\u5668ip\u5730\u5740
\n uint16_t port_; \/\/ \u670d\u52a1\u5668\u7aef\u53e3\u53f7
\n int sock_; \/\/ \u5957\u63a5\u5b57
\n}; <\/p>\n

udp_server.cc<\/p>\n

#include <iostream>
\n#include "udp_server.hpp"
\n#include <string>
\n#include <memory><\/p>\n

static void usage(const std::string &proc)
\n{
\n std::cout << "\\\\nusage: " << proc << " port\\\\n" << std::endl;
\n}<\/p>\n

\/\/ .\/udpserver port
\nint main(int argc, char *argv[])
\n{
\n if (argc != 2)
\n {
\n usage(argv[0]);
\n exit(0);
\n }
\n uint16_t port = atoi(argv[1]);
\n std::unique_ptr<UdpServer> usvr(new UdpServer(port));
\n usvr->InitServer();
\n usvr->start();<\/p>\n

return 0;
\n} <\/p>\n

udp_client.cc<\/p>\n

#include <iostream>
\n#include <sys\/types.h>
\n#include <sys\/socket.h>
\n#include <arpa\/inet.h>
\n#include <netinet\/in.h>
\n#include <cerrno>
\n#include <unistd.h>
\n#include <string>
\n#include <stdio.h>
\n#include <cstring><\/p>\n

static void usage(const std::string &proc)
\n{
\n std::cout << "\\\\nusage: "
\n << proc << " port ip\\\\n"
\n << std::endl;
\n}<\/p>\n

\/\/ .\/udpclient ip port \u5e26\u4e0a\u670d\u52a1\u5668\u7684ip\u548c\u7aef\u53e3\u53f7
\nint main(int argc, char *argv[])
\n{
\n if (argc != 3)
\n {
\n usage(argv[0]);
\n exit(0);
\n }
\n \/\/ 1.\u521b\u5efa\u5957\u63a5\u5b57
\n int sock = socket(AF_INET, SOCK_DGRAM, 0);
\n if (sock < 0)
\n {
\n std::cerr << "\u521b\u5efa\u5957\u63a5\u5b57\u5931\u8d25！" << errno << strerror(errno) << std::endl;
\n exit(1);
\n }
\n \/\/ \u4f5c\u4e3a\u5ba2\u6237\u7aef，\u5176\u4e0d\u9700\u8981\u8fdb\u884c\u7ed1\u5b9a，\u7531os\u81ea\u52a8\u8fdb\u884c\u7ed1\u5b9a
\n std::string message;
\n \/\/ \u7ed9\u54ea\u4e2a\u670d\u52a1\u5668\u53d1\u9001\u6d88\u606f，\u586b\u5145\u670d\u52a1\u5668\u4fe1\u606f
\n struct sockaddr_in send_server;
\n bzero(&send_server, sizeof(send_server));
\n send_server.sin_family = AF_INET;
\n send_server.sin_port = htons(atoi(argv[2]));
\n send_server.sin_addr.s_addr = inet_addr(argv[1]);
\n while (true)
\n {
\n \/\/ 2.\u4ece\u952e\u76d8\u83b7\u53d6\u4fe1\u606f
\n std::cout << "\u8bf7\u8f93\u5165#";
\n std::getline(std::cin, message);
\n if (message == "quit")
\n break;
\n \/\/ 3.\u53d1\u9001\u6d88\u606f
\n sendto(sock, message.c_str(), message.size(), 0, (struct sockaddr *)&send_server, sizeof(send_server));<\/p>\n

\/\/ 4.\u63a5\u6536\u670d\u52a1\u5668\u7684\u6d88\u606f
\n char buffer[1024];
\n struct sockaddr_in revc_server;
\n bzero(&revc_server, sizeof(revc_server));
\n socklen_t len = sizeof(revc_server);
\n ssize_t s = recvfrom(sock, buffer, sizeof(buffer) – 1, 0, (struct sockaddr *)&revc_server, &len);
\n std::cout << "\u670d\u52a1\u5668\u8bf4：" << buffer << std::endl;
\n }
\n close(sock);
\n return 0;
\n}<\/p>\n","protected":false},"excerpt":{"rendered":"

\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb4.1k\u6b21\uff0c\u70b9\u8d5e61\u6b21\uff0c\u6536\u85cf68\u6b21\u3002\u672c\u6587\u8be6\u7ec6\u4ecb\u7ecd\u4e86\u5982\u4f55\u4f7f\u7528C++\u5b9e\u73b0\u4e00\u4e2a\u7b80\u5355\u7684UDP\u670d\u52a1\u5668\uff08UdpServer\uff09\u548c\u5ba2\u6237\u7aef\uff08UdpClient\uff09\uff0c\u5305\u62ec\u670d\u52a1\u5668\u7aef\u53e3\u7ed1\u5b9a\u3001\u5957\u63a5\u5b57\u64cd\u4f5c\u3001\u6570\u636e\u6536\u53d1\u4ee5\u53ca\u5ba2\u6237\u7aef\u8fde\u63a5\u8fc7\u7a0b\u3002\u5c55\u793a\u4e86\u670d\u52a1\u7aef\u521d\u59cb\u5316\u3001\u8fd0\u884c\u903b\u8f91\u548c\u5ba2\u6237\u7aef\u53d1\u9001\u8bf7\u6c42\u7684\u57fa\u672c\u6b65\u9aa4\u3002<\/p>\n","protected":false},"author":2,"featured_media":25220,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[58,193,43,44],"topic":[],"class_list":["post-25222","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-linux","tag-udp","tag-43","tag-44"],"yoast_head":"\n\u7f51\u7edc\u7f16\u7a0b\u5957\u63a5\u5b57\uff08\u4e8c\uff09\u4e4bUDP\u670d\u52a1\u5668\u7b80\u5355\u5b9e\u73b0 - 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