简单的TCPIP 客户端 服务器

 // soClient.cpp : Defines the entry point for the console application.
 //

 #include "stdafx.h"
 #include <winsock2.h>
 #pragma comment(lib,"ws2_32.lib")

 int _tmain(int argc, _TCHAR* argv[])
 {
     WSADATA wsadata;
     WORD dVer=MAKEWORD(,);
     WSAStartup(dVer,&wsadata);

     SOCKET S=::socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
     if(S==INVALID_SOCKET)
     {
         return FALSE;
     }
     sockaddr_in serverAddr;
     serverAddr.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");
     serverAddr.sin_family=AF_INET;
     serverAddr.sin_port=htons();
     if(::connect(S,(LPSOCKADDR)&serverAddr,sizeof(serverAddr))==SOCKET_ERROR)
     {
         if(WSAGetLastError()==)
         {
             printf("服务器未开启");
         }
         return FALSE;
     }

     char buff[];
     int irecv=::recv(S,buff,,);
     if(irecv>)
     {
         buff[irecv] = '\0';  //返回数据不会结束所以人工添加
         printf("返回数据为:%s",buff);
     }

     closesocket(S);
     return ;
 }

服务器

 // soServer.cpp : Defines the entry point for the console application.
 //

 #include "stdafx.h"
 #include "winsock2.h"
 #pragma comment(lib,"ws2_32.lib")

 int _tmain(int argc, _TCHAR* argv[])
 {
     WSADATA wsadata;
     WORD dVer=MAKEWORD(,);
     if(WSAStartup(dVer,&wsadata)!=)
     {
         return FALSE;
     }

     sockaddr_in sin;
     sin.sin_family=AF_INET;
     sin.sin_addr.S_un.S_addr=INADDR_ANY;
     sin.sin_port=htons();
     SOCKET S=::socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);

     if(::bind(S,(LPSOCKADDR)&sin,sizeof(sin))==SOCKET_ERROR)
     {
         return FALSE;
     }

     if(::listen(S,)==SOCKET_ERROR)
     {
         return FALSE;
     }

     sockaddr_in remoteAddr;
     int nAddrLen = sizeof(remoteAddr);
     SOCKET sClient;
     char text[]="you have connected!welcome!";
     printf("等待接受连接。\r\n");
     while(TRUE)
     {
         sClient=::accept(S,(LPSOCKADDR)&remoteAddr,&nAddrLen);
         if(sClient==SOCKET_ERROR)
         {
             printf("获取失败");
             continue;
         }
         printf("接收到新连接:%s",inet_ntoa(remoteAddr.sin_addr));
         send(sClient,text,strlen(text),);
         closesocket(sClient);
     }
     closesocket(S);
     return ;
 }