为什么 PeekMessage 总是返回 TRUE? [英] Why the PeekMessage always return TRUE?

问题描述

        // Main message loop

        MSG msg;
        ZeroMemory( &msg, sizeof( msg ) );
        while(msg.message!=WM_QUIT)
        {

            if(PeekMessage( &msg, NULL, 0U, 0U, PM_REMOVE ) )
            {
                TranslateMessage( &msg );
                DispatchMessage( &msg );
            }
            else
            {
                Render();
            }
        }

渲染"函数尚未执行

推荐答案

PeekMessage 文档说明了有关返回值的内容:

The PeekMessage documentation says this regarding the return value:

如果消息可用，则返回值非零.

If a message is available, the return value is nonzero.

如果没有可用消息，则返回值为零.

If no messages are available, the return value is zero.

当消息队列为空时，确实会返回零，即FALSE.因此结论是消息队列永远不会为空.对此最可能的解释是，您在 DispatchMessage 中处理的消息之一导致将同一条消息发布到队列中.

When the message queue is empty, it will indeed return zero, i.e. FALSE. The conclusion therefore is that the message queue is never empty. And the most likely explanation for that is that one of the messages you handle in DispatchMessage leads to that same message being posted to the queue.

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