网络通信之UDP

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UDP服务端程序

#include <Winsock2.h>#include <stdio.h>void main(){    WORD wVersionRequested;    WSADATA wsaData;    int err;    wVersionRequested = MAKEWORD( 1, 1 );    err = WSAStartup( wVersionRequested, &wsaData );    if ( err != 0 ) {        return;    }    if ( LOBYTE( wsaData.wVersion ) != 1 ||        HIBYTE( wsaData.wVersion ) != 1 ) {        WSACleanup( );        return;     }    SOCKET sockSrv=socket(AF_INET,SOCK_DGRAM,0);    SOCKADDR_IN addrSrv;    addrSrv.sin_addr.S_un.S_addr=htonl(INADDR_ANY);    addrSrv.sin_family=AF_INET;    addrSrv.sin_port=htons(6000);    bind(sockSrv,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));    SOCKADDR_IN addrClient;    int len=sizeof(SOCKADDR);    char recvBuf[100];    while(1)    {        recvfrom(sockSrv,recvBuf,100,0,(SOCKADDR*)&addrClient,&len);        printf("%s\n",recvBuf);        sendto(sockSrv,"i have receaved the message",strlen("i have receaved the message")+1,            0,(SOCKADDR*)&addrClient,len);    }    closesocket(sockSrv);    WSACleanup();    system("pasue");}

UDP客户端程序

#include <Winsock2.h>#include <stdio.h>void main(){    WORD wVersionRequested;    WSADATA wsaData;    int err;    wVersionRequested = MAKEWORD( 1, 1 );    err = WSAStartup( wVersionRequested, &wsaData );    if ( err != 0 ) {        return;    }    if ( LOBYTE( wsaData.wVersion ) != 1 ||        HIBYTE( wsaData.wVersion ) != 1 ) {        WSACleanup( );        return;     }    SOCKET sockClient=socket(AF_INET,SOCK_DGRAM,0);    SOCKADDR_IN addrSrv;    addrSrv.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");    //addrSrv.sin_addr.S_un.S_addr=inet_addr("192.168.1.90");    addrSrv.sin_family=AF_INET;    addrSrv.sin_port=htons(6000);    char recv[100];    //SOCKADDR_IN addr;    int len = sizeof(SOCKADDR);    for(int i = 0;i < 1000;i++)    {        sendto(sockClient,"Hello",strlen("Hello")+1,0,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));        Sleep(1000);        recvfrom(sockClient,recv,100,0,(SOCKADDR*)&addrSrv,&len);        //sprintf(tempBuf,"%s say : %s",inet_ntoa(addrClient.sin_addr),recvBuf);        printf("%s\n",recv);    }    closesocket(sockClient);    WSACleanup();    system("pause");}

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