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MFC不像控制台在MAIN函数里写代码，先添加控件，控件添加事件函数，然后再事件函数里写代码，如果服务器未开启，就去连接，会卡住。测试成功与否可以用MessageBox(_T(“xxx”));

//建立连接
	char sendBuf[512];
	CString sendStr;	
	WORD wVersion;
	WSADATA wsaData;
	int err; 
	wVersion = MAKEWORD(1, 1);
	err = WSAStartup(wVersion, &wsaData);
	if (err != 0) { return ; }
	if (LOBYTE(wsaData.wVersion) != 1 || HIBYTE(wsaData.wVersion) != 1) {
		WSACleanup(); return;
	}
	// 创建tcp套接字 
	SOCKET sockCli = socket(AF_INET, SOCK_STREAM, 0);
	SOCKADDR_IN addrSrv;
	addrSrv.sin_addr.S_un.S_addr = inet_addr("192.168.0.106");//服务器地址127.0.0.1是本机
	addrSrv.sin_family = AF_INET;
	addrSrv.sin_port = htons(6000);//端口
	//向服务器发起连接请求 
	connect(sockCli, (SOCKADDR*)& addrSrv, sizeof(SOCKADDR));

// 发送数据 
		sendStr = m_machineCode;
		 char *buff;          
         buff=sendStr.GetBuffer(sendStr.GetLength()); 
         sendStr.ReleaseBuffer(); 
		//sprintf_s(sendBuf, sizeof(sendStr), (const char*)&sendStr);//字符串转字符数组
		send(sockCli, buff, strlen(sendStr)+1, 0);//发送

 接收数据 
		char recvBuf[24]; //time_t start; time(&start);
		recv(sockCli, recvBuf, sizeof(recvBuf), 0);

// 关闭套接字 
		closesocket(sockCli);
		WSACleanup();