C/C++使用Socket通信UDP

接收端

 #include <stdio.h>
 #include <WinSock2.h>

 #pragma comment(lib,"WS2_32.lib")

 int main(void)
 {
     WSADATA wsd;    // 初始化Socket的变量
     SOCKET s;        // 用于通信的Socket句柄
     SOCKADDR_IN sRecvAddr,sSendAddr;    // 分别为接收地址和发送地址
     USHORT uPort = ;                // 通信端口
     CHAR szBuf[] = {  };            // 通信数据缓冲区
     int nBufLen = ,nResult = , nSenderAddrSize = sizeof(sSendAddr);

     // 初始化Socket2.2版本
     nResult = WSAStartup(MAKEWORD(, ), &wsd);
     if (nResult != NO_ERROR)
     {
         printf("WSAStartup failed:%d\n", WSAGetLastError());
         return ;
     }

     // 创建一个Socket,SOCK_DGRAM表示UDP类型
     s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
     if (s == INVALID_SOCKET)
     {
         printf("socket failed:%d\n", WSAGetLastError());
         return ;
     }

     // 填充Socket接口
     sRecvAddr.sin_family = AF_INET;        // 地址协议,AF_INET支持TCP和UDP
     sRecvAddr.sin_port = htons(uPort);    // 通信端口,htons转为网络字节顺序
     sRecvAddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);    // 接收任意地址数据

     // 绑定Socket至本机
     nResult = bind(s, (SOCKADDR *)&sRecvAddr, sizeof(sRecvAddr));
     if (nResult != )
     {
         printf("bind failed:%d\n", WSAGetLastError());
         return ;
     }

     printf("Waiting recv data...\n");
     // 阻塞式接收数据
     nResult = recvfrom(s, szBuf, nBufLen, , (SOCKADDR *)&sSendAddr, &nSenderAddrSize);
     if (nResult == SOCKET_ERROR)
     {
         printf("recvfrom failed:%d\n", WSAGetLastError());
     }
     else{
         printf("SenderIP  :%s\n", inet_ntoa(sSendAddr.sin_addr));
         printf("SenderData:%s\n", szBuf);
     }
     // 关闭Socket连接
     nResult = closesocket(s);
     if (nResult == SOCKET_ERROR)
     {
         printf("closesocket failed:%d\n", WSAGetLastError());
         return ;
     }
     // 清理Socket
     WSACleanup();

     system("pause");
     return ;
 }

发送端

#include <stdio.h>
#include <WinSock2.h>
#include <Windows.h>

#pragma comment(lib,"WS2_32.lib")

int main(void)
{
    WSADATA wsd;
    SOCKET s;

    if (WSAStartup(MAKEWORD(, ), &wsd))
    {
        printf("WSAStartup failed!\n");
        return ;
    }

    s = socket(AF_INET, SOCK_DGRAM, );
    if (s == INVALID_SOCKET)
    {
        printf("socket failed,Error Code:%d\n", WSAGetLastError());
        WSACleanup();
        return ;
    }
    SOCKADDR_IN addr;
    SOCKET sockClient = socket(AF_INET, SOCK_DGRAM, );

    addr.sin_family = AF_INET;
    addr.sin_addr.S_un.S_addr = inet_addr("172.18.0.67");
    addr.sin_port = htons();

    sendto(sockClient, "测试UDP通信！", , , (sockaddr *)&addr, );
    closesocket(s);
    WSACleanup();
    printf("Hello World!\n");
    system("pause");
    return ;
}

效果图