原文 http://www.blogjava.net/huyi2006/articles/263831.html

借此地方整理以下socket编程的多种语言的实现，socket可以跨平台的通信，因此多语言、多平台下的实现有必要了解的。代码都是源自网上，感谢网友的分享。

socket编程在windows下的C语言实现，dev C++下编译通过
编译时设置编译选项 工具-->编译选项-->编译器，勾选在连接器命令行加入以下命令，在对话框中填-lwsock32
//server.c
#include <stdio.h>
#include <Winsock2.h>
int 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_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);
    
    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[50];
        sprintf(sendBuf,"Welcome %s to here!",inet_ntoa(addrClient.sin_addr));
        send(sockConn,sendBuf,strlen(sendBuf)+1,0);
        char recvBuf[50];
        recv(sockConn,recvBuf,50,0);
        printf("%s\n",recvBuf);
        closesocket(sockConn);
    }
}

//客户端代码
#include <stdio.h>
#include <Winsock2.h>
int 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_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);
    connect(sockClient,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));
    send(sockClient,"hello",strlen("hello")+1,0);
    char recvBuf[50];
    recv(sockClient,recvBuf,50,0);
    printf("%s\n",recvBuf); 
    closesocket(sockClient);
    WSACleanup();
}