网络的connect如何超时设置？MFC socket异步 timeout select

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这个帖子很精彩：
http://bbs.csdn.net/topics/390416681?page=1
附关键代码：
m_strServerIP = strServerIP;m_nPort = nPort;while( true ){// 创建套接字m_socket = socket(AF_INET,SOCK_STREAM,0);if( m_socket == INVALID_SOCKET )break;// 设置为非阻塞模式DWORD ul = 1;if( 0 != ioctlsocket( m_socket, FIONBIO, &ul) ) break;// 将UNICODE的IP地址转换为多字节字符的IP地址char szServerIP[16] = { 0 };if( WideCharToMultiByte( CP_ACP,0,m_strServerIP,m_strServerIP.GetLength(),szServerIP,sizeof(szServerIP),NULL,NULL ) == 0 )break;// 连接指定的IP地址和端口SOCKADDR_IN sin;sin.sin_family = AF_INET;sin.sin_port = htons(m_nPort);sin.sin_addr.s_addr = inet_addr( szServerIP );if( ! ( SOCKET_ERROR == connect( m_socket, (SOCKADDR *)&sin, sizeof(sin)) && WSAGetLastError() == WSAEWOULDBLOCK ) )break;// 异步connect不会等待就直接返回了，用select的方式来判断connect是否成功，select会阻塞，只到connect连接成功或失败后select才返回fd_set fs_read;FD_ZERO( &fs_read );FD_SET( m_socket,&fs_read );fd_set fs_write;fs_write.fd_count = 1;fs_write.fd_array[0] = m_socket;fd_set fs_error;fs_error.fd_count = 1;fs_error.fd_array[0] = m_socket;int ret = select( 0,&fs_read,&fs_write,&fs_error,NULL );if( ret == SOCKET_ERROR )break;// 判断socket句柄是否可写if( !FD_ISSET( m_socket,&fs_write ) )break;int optval = -1;int optlen = sizeof(optval);ret = getsockopt( m_socket,SOL_SOCKET,SO_ERROR,(char*)(&optval),&optlen );if( ret != 0 || optval != 0)break;// 直到这里connect才是真正成功// 创建监听线程收到消息的事件句柄m_wsaEvent = WSACreateEvent();if( m_wsaEvent == WSA_INVALID_EVENT )break;// 给监听线程的消息到达事件句柄配置要通知的事件类型if( WSAEventSelect( m_socket,m_wsaEvent,FD_READ|FD_WRITE|FD_CONNECT|FD_CLOSE ) != 0 )break;// 创建通知监听线程退出的事件句柄m_wsaClose = WSACreateEvent();if( m_wsaClose == WSA_INVALID_EVENT )break;// 创建消息事件监听线程DWORD dwThreadId;m_hThreadEvent = CreateThread( NULL, 0, ThreadProc_SocketEvent, this, 0, &dwThreadId );if( m_hThreadEvent == NULL )break;// 创建定时发送心跳包的事件句柄m_hEventHeartbeat= CreateEvent( NULL,TRUE,FALSE,NULL );if( m_hEventHeartbeat == NULL )break;// 创建定时发送心跳包的线程m_hThreadHeartbeat = CreateThread( NULL,0,ThreadProc_Heartbeat,this,0, &dwThreadId );if( m_hThreadHeartbeat == NULL )break;// 全部创建成功，返回TRUEreturn TRUE;}
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