UDP服务器程序

#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)); char recvBuf[100]={NULL}; char sendBuf[100]={NULL}; char tempBuf[200]={NULL}; SOCKADDR_IN addrClient; int len=sizeof(SOCKADDR); while(1) { printf("请输入要发送到客户端的数据:\n"); gets(sendBuf); sendto(sockSrv,sendBuf,strlen(sendBuf)+1,0,(SOCKADDR*)&addrClient,len); //recvfrom(sockSrv,recvBuf,100,0,(SOCKADDR*)&addrClient,&len); //if('q'==recvBuf[0]) //{ // sendto(sockSrv,"q",strlen("q")+1,0,(SOCKADDR*)&addrClient,len); // printf("Chat end!\n"); // break; //} ///*sprintf(tempBuf,"%s say : %s",inet_ntoa(addrClient.sin_addr),recvBuf);*/ // printf("%s\n",recvBuf); } closesocket(sockSrv); WSACleanup(); }