利用WinSock 编程接口，实现点对点通信

#include <winsock2.h> #include <stdio.h> #pragma comment (lib, "ws2_32.lib") void main() { WORD wVersionRequired; WSADATA wsaData; int err; wVersionRequired = MAKEWORD(1,1); err = WSAStartup( wVersionRequired, &wsaData ); if ( err !=0 ) { printf("error"); return; } if (LOBYTE( wsaData.wVersion ) != 1 || HIBYTE( wsaData.wVersion) != 1) { WSACleanup(); return; } SOCKET sockSrv = socket( AF_INET, SOCK_STREAM,0 ); SOCKADDR_IN addrSrv; addrSrv.sin_addr.S_un.S_addr= htonl(INADDR_ANY); addrSrv.sin_family = AF_INET; addrSrv.sin_port=htons(5000); bind(sockSrv,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR)); listen(sockSrv,5); SOCKADDR_IN addrClient; int len= sizeof(SOCKADDR); while (1) { SOCKET sockConn = accept( sockSrv, (SOCKADDR*)&addrClient, &len); char sendBuf[100]; char message[1000]; scanf("%s", message); sprintf( sendBuf,message,inet_ntoa(addrClient.sin_addr)); send( sockConn,sendBuf,strlen(sendBuf)+1, 0 ); char recvBuf[100]; recv( sockConn, recvBuf, 100, 0); printf("%s\n",recvBuf); closesocket(sockConn); } }