基于TCP的网络编程

服务器端程序：

#include <Winsock2.h> #include <stdio.h>

#pragma comment( lib, "Wsock32.lib" )            //加入lib库

void main() { //加载套接字库
 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 ; } //创建用户监听的套接字
    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( 6000 ); //绑定套接字
    bind( sockSrv,(SOCKADDR*)&addrSrv,sizeof( SOCKADDR ) ); //将套接字设为监听模式，准备接受客户请求
    listen( sockSrv,5 ); SOCKADDR_IN addrClient; int len = sizeof( SOCKADDR ); while ( 1 ){ //等待客户请求到来
        SOCKET sockConn = accept( sockSrv,(SOCKADDR*)&addrClient,&len ); char sendBuf[100]; sprintf( sendBuf,"Welcome %s to http://www.sunxin.org",inet_ntoa( addrClient.sin_addr ) ); //发送数据
        send( sockConn,sendBuf,strlen( sendBuf )+1,0 ); char recvBuf[100]; //接受数据
        recv( sockConn,recvBuf,100,0 ); //打印接受的数据
        printf( "%s\n",recvBuf ); //关闭套接字
 closesocket( sockConn ); } }

客户端程序：

#include <Winsock2.h> #include <stdio.h>

#pragma comment( lib, "Wsock32.lib" )            //加入lib库

void main() { //加载套接字库
 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 ; } //创建套接字
    SOCKET sockClient = socket( AF_INET,SOCK_STREAM,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 ); //向服务器发出连接请求
    connect( sockClient,(SOCKADDR*)&addrSrv,sizeof( SOCKADDR ) ); //接收数据
    char recvBuf[100]; recv( sockClient,recvBuf,100,0 ); printf( "%s\n",recvBuf ); //发送数据
    send( sockClient,"This is lisi",strlen( "This is lisi" )+1,0 ); //关闭套接字
 closesocket( sockClient ); WSACleanup(); }

先启动服务器端程序，在运行客户端程序。连接之后接收服务器发来的欢迎信息，在发给位于本机6000端口的服务器程序一条信息“This is lisi”。