#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 ;

 }

#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 ;

}