程序代码：

#include <winsock2.h>
#include <stdio.h>

void 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)
{
char sendBuf[500];
char recvBuf[500];
SOCKET sockConn = accept(sockSrv,(SOCKADDR*)&addrClient,&len);

sprintf(sendBuf,"Welcome %s to XXX",inet_ntoa(addrClient.sin_addr));
send(sockConn,sendBuf,strlen(sendBuf)+1,0);
recv(sockConn,recvBuf,100,0);
printf("%s",recvBuf);
closesocket(sockConn);
}

}

程序代码：

#include <winsock2.h>
#include <stdio.h>

void 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("172.0.0.1");
addrSrv.sin_family = AF_INET;
addrSrv.sin_port = htons(6000);

connect(sockClient,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));  //和他的一样，调式是这里没链接上，没错，就是什麽也接收不到
char recvBuf[100];

recv(sockClient,recvBuf,100,0);
printf("%s\n",recvBuf);
send(sockClient,"This is the client",strlen("This is client")+1,0);

closesocket(sockClient);
WSACleanup();
}