{"id":76296,"date":"2026-02-22T06:17:35","date_gmt":"2026-02-21T22:17:35","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/76296.html"},"modified":"2026-02-22T06:17:35","modified_gmt":"2026-02-21T22:17:35","slug":"csocket%e7%bd%91%e7%bb%9c%e7%bc%96%e7%a8%8b-udp%e6%9c%8d%e5%8a%a1%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/76296.html","title":{"rendered":"C++socket\u7f51\u7edc\u7f16\u7a0b\u2014\u2014udp\u670d\u52a1\u5668"},"content":{"rendered":"

\u76ee\u5f55<\/p>\n

\n

\u4e00.\u7aef\u53e3\u53f7 VS\u00a0 PID<\/p>\n

\u4e8c.\u5957\u63a5\u5b57\u7f16\u7a0b\u7684\u7c7b\u578b<\/p>\n

\u4e09.socket\u7f16\u7a0b\u63a5\u53e3<\/p>\n

\u56db.\u57fa\u4e8eudp\u7684\u670d\u52a1\u7aef\u548c\u5ba2\u6237\u7aef\u5168\u90e8\u4ee3\u7801<\/p>\n

\u5ba2\u6237\u7aef<\/p>\n

\u670d\u52a1\u7aef<\/p>\n

\u4e94.\u89e3\u91ca\u4e0e\u8fd0\u884c<\/p>\n

\u4e00\u4e9b\u7ec6\u8282：<\/p>\n

\u516d.\u603b\u7ed3<\/p>\n

\n

\u4e00.\u7aef\u53e3\u53f7 VS\u00a0 PID<\/h2>\n

pid\u5df2\u7ecf\u80fd\u591f\u6807\u8bc6\u4e00\u53f0\u4e3b\u673a\u4e0a\u7684\u4e00\u4e2a\u552f\u4e00\u4e00\u4e2a\u8fdb\u7a0b\u4e86，\u4e3a\u4ec0\u4e48\u8fd8\u9700\u8981\u7aef\u53e3\u53f7？<\/p>\n

  • \u4e0d\u662f\u6240\u6709\u7684\u8fdb\u7a0b\u90fd\u9700\u8981\u7f51\u7edc\u901a\u4fe1，\u4f46\u662f\u6240\u6709\u7684\u8fdb\u7a0b\u90fd\u9700\u8981\u90fdpid；<\/li>\n
  • \u7cfb\u7edf\u548c\u7f51\u7edc\u529f\u80fd\u89e3\u8026\u3002<\/li>\n

    \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u53e6\u5916，\u4e00\u4e2a\u8fdb\u7a0b\u53ef\u4ee5\u7ed1\u5b9a\u591a\u4e2a\u7aef\u53e3，\u4f46\u4e00\u4e2a\u7aef\u53e3\u53ea\u80fd\u88ab\u4e00\u4e2a\u8fdb\u7a0b\u7ed1\u5b9a\u3002<\/p>\n

    \u00a0 \u00a0 \u00a0 \u00a0 \u7cfb\u7edf\u5185\u5b9a\u7684\u7aef\u53e3\u53f7\u30100,1023\u3011\u4e00\u822c\u90fd\u8981\u6709\u56fa\u5b9a\u7684\u5e94\u7528\u5c42\u534f\u8bae\u4f7f\u7528，\u5982http：80，https：443\u3002<\/p>\n

    \u4e8c.\u5957\u63a5\u5b57\u7f16\u7a0b\u7684\u7c7b\u578b<\/h2>\n
  • \u57df\u95f4\u5957\u63a5\u5b57\u7f16\u7a0b\u2014\u2014\u540c\u4e00\u4e2a\u673a\u5668\u5185<\/li>\n
  • \u539f\u59cb\u5957\u63a5\u5b57\u7f16\u7a0b\u2014\u2014\u7f51\u7edc\u5de5\u5177<\/li>\n
  • \u7f51\u7edc\u5957\u63a5\u5b57\u7f16\u7a0b\u2014\u2014\u7528\u6237\u95f4\u7684\u7f51\u7edc\u901a\u4fe1<\/li>\n

    \u00a0 \u00a0 \u00a0 \u00a0 \u4e0d\u540c\u7684\u5957\u63a5\u5b57\u7f16\u7a0b\u7c7b\u578b\u7684\u63a5\u53e3\u9700\u8981\u662f\u76f8\u540c\u7684\u3002<\/p>\n

    \"\"<\/p>\n

    \u00a0 \u00a0 \u00a0 \u00a0 \u5982\u540c\u7528\u4e00\u4e2a\u7edf\u4e00\u7684sockaddr\u4f5c\u4e3a\u57fa\u7c7b，sockaddr_in\u548csockaddr_un\u4f5c\u4e3a\u5b50\u7c7b\u3002\u4f7f\u7528\u7684\u65f6\u5019\u6211\u4eec\u7528if\u8bed\u53e5\u533a\u5206\u5177\u4f53\u662f\u4ec0\u4e48\u7c7b\u578b，\u5982\u540c\u4e0b\u9762\u8fd9\u6bb5\u4ee3\u7801：<\/p>\n

    if(address->type == AF_INET)
    \n{
    \n \/\/ \u7f51\u7edc\u5957\u63a5\u5b57
    \n}
    \nelse if(address->type == AF_UNIX)
    \n{
    \n \/\/ \u57df\u95f4\u5957\u63a5\u5b57
    \n} <\/p>\n

    \u00a0 \u00a0 \u00a0 \u00a0 \u4e3a\u4ec0\u4e48\u64cd\u4f5c\u7cfb\u7edf\u63a5\u53e3\u8bbe\u8ba1\u8005\u5728\u8bbe\u8ba1\u7684\u65f6\u5019\u4e0d\u76f4\u63a5\u4f7f\u7528void*\u5462，\u56e0\u4e3a\u90a3\u65f6\u5019C\u8bed\u8a00\u8fd8\u6ca1\u6709void*\u3002<\/p>\n

    \u4e09.socket\u7f16\u7a0b\u63a5\u53e3<\/h2>\n

    \/\/ \u521b\u5efa socket \u6587\u4ef6\u63cf\u8ff0\u7b26（TCP\/UDP，\u5ba2\u6237\u7aef + \u670d\u52a1\u5668）
    \nint socket(int domain, int type, int protocol);<\/p>\n

    \/\/ \u7ed1\u5b9a\u7aef\u53e3\u53f7（TCP\/UDP，\u670d\u52a1\u5668）
    \nint bind(int sockfd, const struct sockaddr *addr, socklen_t addrlen);<\/p>\n

    \/\/ \u5f00\u59cb\u76d1\u542csocket（TCP，\u670d\u52a1\u5668）
    \nint listen(int sockfd, int backlog);<\/p>\n

    \/\/ \u63a5\u6536\u8bf7\u6c42（TCP，\u670d\u52a1\u5668）
    \nint accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen);<\/p>\n

    \/\/ \u5efa\u7acb\u8fde\u63a5（TCP，\u5ba2\u6237\u7aef）
    \nint connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen);<\/p>\n

    \u56db.\u57fa\u4e8eudp\u7684\u670d\u52a1\u7aef\u548c\u5ba2\u6237\u7aef\u5168\u90e8\u4ee3\u7801<\/h2>\n

    \u5ba2\u6237\u7aef<\/h3>\n

    \u4ee3\u7801\u5982\u4e0b：<\/p>\n

    client.cc:<\/p>\n

    #include <iostream>
    \n#include <sys\/types.h>
    \n#include <sys\/socket.h>
    \n\/\/ #include <stdio.h>
    \n#include <unistd.h>
    \n#include <strings.h>
    \n#include <arpa\/inet.h> \/\/ sockaddr_in
    \nusing namespace std;<\/p>\n

    void usage(const std::string& proc)
    \n{
    \n cout << "Please use like this : " + proc + " [ip] [port]" << endl;
    \n}<\/p>\n

    int main(int argc, char* argv[])
    \n{
    \n if(argc != 3)
    \n {
    \n usage(argv[0]);
    \n exit(1);
    \n }<\/p>\n

    string serverip = argv[1];
    \n uint16_t serverport = stoi(argv[2]);<\/p>\n

    int sockFd = socket(AF_INET, SOCK_DGRAM, 0);
    \n if(sockFd < 0) cerr << "sockFd error" << endl;<\/p>\n

    struct sockaddr_in server;<\/p>\n

    socklen_t sz = sizeof(server);
    \n bzero(&server, sz);
    \n server.sin_family = AF_INET;
    \n server.sin_addr.s_addr = inet_addr(serverip.c_str());
    \n server.sin_port = htons(serverport);<\/p>\n

    std::string temp;
    \n while(true)
    \n {
    \n cout << "\u8bf7\u8f93\u5165\u6d88\u606f@ ";
    \n getline(cin, temp);<\/p>\n

    int ret = sendto(sockFd, temp.c_str(), temp.size(), 0, (struct sockaddr*)&server, sz);
    \n if(ret < 0) std::cerr << "send error" << std::endl;<\/p>\n

    char buffer[1024];<\/p>\n

    struct sockaddr_in retServer;
    \n socklen_t len = sizeof(retServer);
    \n int n = recvfrom(sockFd, buffer, sizeof(buffer) – 1, 0, (struct sockaddr*)&retServer, &len);
    \n if(n > 0)
    \n {
    \n buffer[n] = 0;
    \n cout << "\u6536\u5230\u6d88\u606f：" << buffer << endl;
    \n }
    \n }
    \n close(sockFd);<\/p>\n

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

    \u670d\u52a1\u7aef<\/h3>\n

    \u4ee3\u7801\u5982\u4e0b：<\/p>\n

    UdpServer.hpp:<\/p>\n

    #include <string>
    \n#include <sys\/types.h>
    \n#include <sys\/socket.h>
    \n#include <strings.h>
    \n#include <unistd.h>
    \n\/\/ #include <netinet\/in.h>
    \n#include <arpa\/inet.h> \/\/ sockaddr_in
    \n#include <iostream>
    \n#include <vector>
    \n#include <functional><\/p>\n

    using func_t = std::function<std::string(const std::string&)>;<\/p>\n

    const std::string defaultip = "0.0.0.0";
    \nconst uint16_t defaultport = 8080;<\/p>\n

    class UdpServer
    \n{
    \npublic:
    \n UdpServer():_sockFd(-1)
    \n {}
    \n ~UdpServer()
    \n {
    \n if(_sockFd >= 0) close(_sockFd);
    \n }
    \n void init(const std::string& ip = defaultip, uint16_t port = defaultport)
    \n {
    \n _sockFd = socket(AF_INET, SOCK_DGRAM, 0);
    \n if(_sockFd < 0) std::cerr << "\u521b\u5efa\u5957\u63a5\u5b57\u5931\u8d25" << std::endl;<\/p>\n

    struct sockaddr_in local;
    \n bzero(&local, sizeof(local));
    \n local.sin_family = AF_INET;
    \n local.sin_addr.s_addr = inet_addr(ip.c_str());
    \n local.sin_port = htons(port);<\/p>\n

    int ret = bind(_sockFd, (const struct sockaddr*)&local, sizeof(local));
    \n if(ret < 0) std::cerr << "\u7ed1\u5b9a\u672c\u5730\u5957\u63a5\u5b57\u4fe1\u606f\u5931\u8d25" << std::endl;
    \n }
    \n void run(func_t func)
    \n {
    \n while(true)
    \n {
    \n struct sockaddr_in client;
    \n socklen_t sz = sizeof(client);
    \n char buffer[1024];
    \n int n = recvfrom(_sockFd, buffer, sizeof(buffer) – 1, 0, (struct sockaddr*)&client, &sz);
    \n buffer[n] = 0;<\/p>\n

    std::string clientip = inet_ntoa(client.sin_addr);
    \n uint16_t clientport = ntohs(client.sin_port);<\/p>\n

    std::cout << "[" << clientip + ":" << clientport << "] send information : " << buffer << std::endl;<\/p>\n

    std::string temp = func(buffer);<\/p>\n

    int ret = sendto(_sockFd, temp.c_str(), temp.size(), 0, (const struct sockaddr*)&client, sz);
    \n if(ret < 0) std::cerr << "send error" << std::endl;
    \n }
    \n }
    \nprivate:
    \n int _sockFd;
    \n};<\/p>\n

    main.cc:<\/p>\n

    #include "UdpServer.hpp"
    \n#include <memory>
    \n#include <string>
    \n#include <string.h><\/p>\n

    std::string echo(const std::string& cData)
    \n{
    \n return "server : " + cData;
    \n}<\/p>\n

    std::string command(const std::string& cData)
    \n{
    \n std::string ret;
    \n FILE* fp = popen(cData.c_str(), "r");
    \n if(fp == nullptr)
    \n {
    \n perror("popen");
    \n exit(1);
    \n }<\/p>\n

    while(true)
    \n {
    \n char buffer[1024];
    \n memset(buffer, sizeof(buffer), 0);
    \n char* ok = fgets(buffer, sizeof(buffer) – 1, fp);
    \n if(ok == nullptr) break;
    \n ret += buffer;
    \n }
    \n pclose(fp);<\/p>\n

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

    int main()
    \n{
    \n std::unique_ptr<UdpServer> udpServer(new UdpServer());
    \n udpServer->init();
    \n udpServer->run(command);<\/p>\n

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

    makefile:<\/p>\n

    .PHONY:all
    \nall:UdpServer client
    \nUdpServer:main.cc
    \ng++ -o $@ $^ -std=c++11
    \nclient:client.cc
    \ng++ -o $@ $^ -std=c++11 -lpthread
    \n.PHONY:clean
    \nclean:
    \nrm -f UdpServer client <\/p>\n

    \u4e94.\u89e3\u91ca\u4e0e\u8fd0\u884c<\/h2>\n
      \n
    • \u5ba2\u6237\u7aef：\u63a5\u6536\u7528\u6237\u8f93\u5165\u7684\u5b57\u7b26\u4e32（\u53ef\u4ee5\u662f\u666e\u901a\u6d88\u606f\u6216\u7cfb\u7edf\u547d\u4ee4），\u901a\u8fc7 UDP \u53d1\u9001\u7ed9\u6307\u5b9a IP \u548c\u7aef\u53e3\u7684\u670d\u52a1\u7aef，\u7136\u540e\u7b49\u5f85\u5e76\u6253\u5370\u670d\u52a1\u7aef\u7684\u54cd\u5e94\u3002<\/li>\n
    • \u670d\u52a1\u7aef：\u4ee5\u7c7b\u7684\u5f62\u5f0f\u5c01\u88c5（UdpServer），\u76d1\u542c\u6307\u5b9a\u7aef\u53e3，\u63a5\u6536\u5ba2\u6237\u7aef\u7684\u6d88\u606f\u540e，\u901a\u8fc7\u56de\u8c03\u51fd\u6570\u5904\u7406（\u9ed8\u8ba4\u662f\u6267\u884c\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u7cfb\u7edf\u547d\u4ee4\u5e76\u8fd4\u56de\u6267\u884c\u7ed3\u679c，\u4e5f\u53ef\u5207\u6362\u4e3a\u7b80\u5355\u56de\u663e），\u518d\u5c06\u5904\u7406\u7ed3\u679c\u901a\u8fc7 UDP \u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\u3002<\/li>\n<\/ul>\n

      \u8fd0\u884c\u7ed3\u679c：<\/p>\n

      \"\"<\/p>\n

      \u00a0 \u00a0 \u00a0 \u00a0 \u8fd9\u6837，\u6211\u4eec\u5c31\u53ef\u4ee5\u8fdc\u7a0b\u8f93\u5165\u547d\u4ee4\u4e86，xshell\u8fdc\u7a0b\u8fde\u63a5\u670d\u52a1\u5668\u5c31\u662f\u8fd9\u6837\u7c7b\u4f3c\u7684\u539f\u7406\u3002<\/p>\n

      \u4e00\u4e9b\u7ec6\u8282：<\/h3>\n

      \"\"<\/p>\n

      \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0AF_INET\u6307\u660e\u4f7f\u7528ipv4\u534f\u8bae，sock_DGRAM\u6307\u660e\u9762\u5411\u6570\u636e\u62a5\u7684udp\u534f\u8bae，\u7b2c2\u4e2a\u53c2\u6570\u534f\u8bae\u7c7b\u578b\u4e0d\u7528\u7ba1\u3002<\/p>\n

      \"\"<\/p>\n

      \u00a0 \u00a0 \u00a0 \u00a0 \u7ed1\u5b9a\u4e4b\u524d\u5c06\u81ea\u5df1\u7684\u4fe1\u606f\u586b\u5165sockaddr_in\u8fd9\u4e2a\u6570\u636e\u7ed3\u6784\u4e2d\u3002AF_INET\u8868\u660e\u662f\u7f51\u7edcsocket\u7f16\u7a0b，s_addr\u8868\u660e\u670d\u52a1\u7aef\u7684ip\u5730\u5740，\u8c03\u7528inet _addr\u51fd\u6570\u5c06\u5b83\u8f6c\u6362\u621032\u4f4d\u6570\u5b57\u5e76\u4e14\u8f6c\u6362\u4e3a\u7f51\u7edc\u5b57\u8282\u5e8f\u5217，\u4e5f\u5c31\u662f\u5927\u7aef\u3002htons\u4e5f\u5c31\u662f\u5c06short\u7c7b\u578b\u6570\u636e\u8f6c\u6362\u4e3a\u7f51\u7edc\u5b57\u8282\u5e8f\u5217，\u4e5f\u5c31\u662f\u5927\u7aef\u3002<\/p>\n

      \"\"<\/p>\n

      \u00a0 \u00a0 \u00a0 \u00a0 \u5012\u6570\u7b2c\u4e00\u4e2a\u53c2\u6570len \u65e2\u662f\u8f93\u5165\u578b\u53c2\u6570，\u4e5f\u662f\u8f93\u51fa\u578b\u53c2\u6570；\u5012\u6570\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u8f93\u51fa\u578b\u53c2\u6570\u3002<\/p>\n

      \"\"<\/p>\n

      \u00a0 \u00a0 \u00a0 \u00a0 \u7f51\u7edc\u8f6c\u6210\u4e3b\u673a\u7684\u5b57\u8282\u5e8f，\u5e76\u4e1432\u4f4d\u6570\u5b57\u7684ip\u8f6c\u6362\u4e3a\u70b9\u5206\u5341\u8fdb\u5236\u5b57\u7b26\u4e32\u5f62\u5f0f\u3002<\/p>\n

      \u516d.\u603b\u7ed3<\/h2>\n

      \u00a0 \u00a0 \u00a0 \u00a0 \u6211\u4eec\u8fd8\u53ef\u4ee5\u8fdb\u884c\u6269\u5c55\u3002\u5c06\u8fd9\u4e2a\u670d\u52a1\u5f04\u6210\u591a\u4eba\u804a\u5929\u3002\u670d\u52a1\u7aef\u7528\u4e00\u4e2a\u54c8\u5e0c\u548c\u5ba2\u6237\u7aef\u7684ip\u5730\u5740\u552f\u4e00\u6807\u8bc6\u4e00\u4e2a\u5ba2\u6237\u7aef，\u7ba1\u7406\u8d77\u6765\u4e4b\u540e\u5c31\u53ef\u4ee5\u5bf9\u6bcf\u4e00\u6761\u6d88\u606f\u8fdb\u884c\u5e7f\u64ad\u7ed9\u6bcf\u4e00\u4e2a\u5ba2\u6237\u7aef\u4e86，\u5ba2\u6237\u7aef\u662f\u591a\u7ebf\u7a0b\u7684，\u4e00\u4e2a\u7ebf\u7a0b\u8d1f\u8d23\u53d1\u9001\u6d88\u606f，\u4e00\u4e2a\u7ebf\u7a0b\u8d1f\u8d23\u63a5\u6536\u6d88\u606f，\u4e3a\u4e86\u53d1\u9001\u548c\u63a5\u6536\u4e0d\u5728\u4e00\u4e2a\u7ec8\u7aef\u8fdb\u884c，\u6211\u4eec\u53ef\u4ee5\u5c06\u63a5\u6536\u7ebf\u7a0b\u91cc\u7684\u6807\u51c6\u8f93\u51fa\u6216\u8005\u6807\u51c6\u9519\u8bef\u91cd\u5b9a\u5411\u5230\/dev\/pts\/\u67d0\u67d0\u5e8f\u53f7\u7684\u8fd9\u4e2a\u6587\u4ef6\u5939，\u7528dup2\u8fd9\u4e2a\u51fd\u6570\u5c31\u53ef\u4ee5\u505a\u5230，\u7136\u540e\u6211\u4eec\u5ba2\u6237\u7aef\u5c31\u53ef\u4ee5\u5728\u4e00\u4e2a\u7ec8\u7aef\u53d1\u9001\u6d88\u606f，\u4e00\u4e2a\u7ec8\u7aef\u63a5\u6536\u6d88\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

      \u76ee\u5f55 \u4e00.\u7aef\u53e3\u53f7 VS\u00a0 PID
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