UDP通信

#include  < Winsock2.h > #include  < stdio.h > #pragma comment(lib, " ws2_32.lib " ) 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];    recvfrom(sockSrv,recvBuf,100,0,(SOCKADDR*)&addrClient,&len);    printf("%s\n",recvBuf);    closesocket(sockSrv);    WSACleanup();} #include  < Winsock2.h > #include  < stdio.h > #pragma comment(lib, " ws2_32.lib " ) 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_family=AF_INET;    addrSrv.sin_port=htons(6000);    sendto(sockClient,"Hello",strlen("Hello")+1,0,        (SOCKADDR*)&addrSrv,sizeof(SOCKADDR));    closesocket(sockClient);    WSACleanup();}