简单的客户/服务器程序（基于windows Socket API）

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//服务器端

#include<stdio.h>
#include< winsock2.h>
#include<windows.h>
BOOL InitSock();//加载winsock第一个版本进行版本协商
int main()
{
system("color 4f");
InitSock();//加载winsock第一个版本进行版本协商
//创建套接字

SOCKET m_SrvSocket=socket(AF_INET,SOCK_STREAM,0);
SOCKADDR_IN m_SrvAddr;
m_SrvAddr.sin_addr .S_un .S_addr =htonl(INADDR_ANY);
m_SrvAddr.sin_family =AF_INET;
m_SrvAddr.sin_port =htons(1024);
bind(m_SrvSocket,(SOCKADDR*)&m_SrvAddr,sizeof(SOCKADDR));//绑定端口号
    if(SOCKET_ERROR==listen(m_SrvSocket,10))//监听客户端的请求
{
  ::MessageBox(NULL,"监听失败","failed",0);
  closesocket(m_SrvSocket);
     WSACleanup();
  return 0;
}
SOCKADDR_IN m_ClientAddr;
int len=sizeof(SOCKADDR);
char Buf[200];
char Recv[200];
char SendBuf[200];
//SOCKET connect=accept(m_SrvSocket,(SOCKADDR*)&m_ClientAddr,&len);
printf("我是服务器，开始聊天.../n");
SOCKET connect=accept(m_SrvSocket,(SOCKADDR*)&m_ClientAddr,&len);//与客户端建立连接
  if(connect== INVALID_SOCKET )
  {
   ::MessageBox(NULL,"连接失败","ERROR",0);
   closesocket(m_SrvSocket);
         WSACleanup();
   return 0;
  }
     //closesocket(connect);
while(1)
{

  recv(connect,Recv,200,0);
  //if('q'==Recv[0])
  if(!strcmp("quit",Recv))
  {
   sendto(m_SrvSocket,"quit",strlen("quit")+1,0,(SOCKADDR*)&m_ClientAddr,len);
   printf("Chat end!/n");
   break;
  }
  sprintf(Buf,"%s say : %s",inet_ntoa(m_ClientAddr.sin_addr),Recv);
  printf("%s/n",Buf);
  gets(SendBuf);
  send(connect,SendBuf,strlen(Buf)+1,0);
}
closesocket(connect);
closesocket(m_SrvSocket);
WSACleanup();
return 0;

}
BOOL InitSock()
{
  //加载winsock第一个版本进行版本协商
WORD wVersionRequested;
WSADATA wsaData;
int err;

wVersionRequested = MAKEWORD( 1, 1 );

err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) {
  /* Tell the user that we could not find a usable */
  /* WinSock DLL.                                  */
  return false;
}

/* Confirm that the WinSock DLL supports 2.2.*/
/* Note that if the DLL supports versions greater    */
/* than 2.2 in addition to 2.2, it will still return */
/* 2.2 in wVersion since that is the version we      */
/* requested.                                        */

if ( LOBYTE( wsaData.wVersion ) != 1 ||
        HIBYTE( wsaData.wVersion ) != 1 ) {
  /* Tell the user that we could not find a usable */
  /* WinSock DLL.                                  */
  WSACleanup( );
  return false;
}

/* The WinSock DLL is acceptable. Proceed. */
return true;
}