WINSOCK2 WSAAsyncSelect 已弃用问题

Question

您好，我正在使用 winsock2，并且正在尝试进行异步通信。 我尝试使用正在等待接受的TCP server msdn。

我在监听函数之前尝试了WSAAsyncSelect。

WSAAsyncSelect(ListenSocket,
        m_hWnd,
        WM_SOCKET,
        (FD_CLOSE | FD_ACCEPT | FD_READ));

并显示以下错误..

Error   C4996   'WSAAsyncSelect': Use WSAEventSelect() instead or define _WINSOCK_DEPRECATED_NO_WARNINGS to disable deprecated API warnings 

我该如何解决这个..提前谢谢..

Answer 1

要消除该警告，您可以在源文件顶部定义 #define _WINSOCK_DEPRECATED_NO_WARNINGS ，这将禁用此类警告。

也就是说，听一下这个警告并改用WSAEventSelect 可能是值得的。 由于WSAEventSelect 发出事件信号，而不是像WSAAsyncSelect 那样将消息发布到Window 的消息队列中。发布到消息队列中的速度较慢，并且会添加实际上并不需要的额外处理。

我有一个示例，我将在这里为您发布：
...我可能已经过火了...但这一切都很有用且相关。

设置监听套接字

if ( socket_name == INVALID_SOCKET )
{
    P_ERR( "Could not create socket ( Id: %d ): %d\n", id, WSAGetLastError() );
    return INVALID_SOCKET;
}

rerror = bind( socket_name, (SOCKADDR*)&sock_addr, sizeof( sock_addr ) );
if ( rerror != SOCKET_ERROR )
{
    rerror = listen( socket_name, MAX_LISTEN_QUEUE );

    if ( rerror != SOCKET_ERROR )
    {
        /* Selects the events that will trigger the `socket_event` windows event. */
        /* socket_event was created using 'CreateEvent( NULL, TRUE, FALSE, NULL );' */
        WSAEventSelect( socket_name, socket_event, FD_ALL_EVENTS );

        if ( !startStatusThread() )
        {
            rerror = 1;
            P_ERR( "Status thread failed: %d\n", id );
        }
    }
    else
    {
        P_ERR( "listen() error %d : Error %d\n", id, WSAGetLastError() );
        closesocket( socket_name );
    }
}
else
{
    P_ERR( "bind() error ( Id: %d ): %d\n", id, WSAGetLastError() );
    closesocket( socket_name );
}

从 Socket 处理事件

    /* waits 10ms for events in the event array ( in this case just 1 event as socket_event ). */
    rerror = WSAWaitForMultipleEvents( 1, &socket_event, FALSE, 10, FALSE );
    if ( rerror == WSA_WAIT_TIMEOUT )
    {
        continue; /* this block of code runs in a while loop. */
    }

    index = rerror - WSA_WAIT_EVENT_0; /* get the smallest index of a triggered event */
    if ( rerror != WSA_WAIT_TIMEOUT && rerror != WSA_WAIT_FAILED )
    {
        /* returns a list of the events that occured. */
        rerror = WSAEnumNetworkEvents( socket_name, socket_event, &events );
        if ( rerror == SOCKET_ERROR )
        {
            P_ERR( "WSAEnumNetworkEvents Error %d: Id: %d\n", WSAGetLastError(), pThis->id );
            continue;
        }
        /* look below for this function. */
        handleNetworkEvents( events, index );
    }

处理事件。

void
handleNetworkEvents( WSANETWORKEVENTS e, const int socket_index )
{
    int rerror = 0;
    /* on accept. */
    if ( e.lNetworkEvents & FD_ACCEPT )
    {
        if ( e.iErrorCode[FD_ACCEPT_BIT] == 0 )
        {
            onAccept();
        }
        else
        {
            P_ERR( "Unknown network event error %d\n", id );
        }
    }
    /* on connect */
    if ( e.lNetworkEvents & FD_CONNECT )
    {
        if ( e.iErrorCode[FD_CONNECT_BIT] == 0 )
        {
            sendRead(); /* send first read request */
        }
        else
        {
            P_ERR( "Unknown network event error %d\n", id );
        }
    }
    /* on successful read */
    if ( e.lNetworkEvents & FD_READ )
    {
        sendRead(); /* get read data and queue another request. */
        callback( id, inBuffer.buf, lastReadSize ); /* process data. */
    }
    /* on close. */
    if ( e.lNetworkEvents & FD_CLOSE )
    {
        /* close the current event and make a new one ready for a new connection. */
        onClose( socket_index );
    }
}