socket（UDP）客户端程序

#include <Winsock2.h>#include <stdio.h>void main(){WORD wVersionRequested;WSADATA wsaData;int err;wVersionRequested = MAKEWORD( 1, 1 );//版本号1.1//1.加载套接字库err = WSAStartup( wVersionRequested, &wsaData );if ( err != 0 ) {return;}//endof if//判断是否我们请求的winsocket版本，如果不是//则调用WSACleanup终止winsocket的使用并返回if ( LOBYTE( wsaData.wVersion ) != 1 ||        HIBYTE( wsaData.wVersion ) != 1 ) {WSACleanup( );return; }///endof if//2.创建套接字SOCKET sockClient = socket(AF_INET,SOCK_DGRAM,0);//2.发送消息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();}//endof main()