问题描述
我想无辜地打电话
PeekMessage(&msg, 0, WM_KEYDOWN, WM_KEYUP, PM_NOREMOVE | PM_NOYIELD);
和 Windows Vista 64 在 PeekMessage 调用中处理消息.结果是我将重新进入我的绘画调用和各种其他代码.
and Windows Vista 64, in the PeekMessage call, is processing messages. The result is that I'm going re-entrant on my paint call, and all sorts of other code.
在我们的应用程序中绘制可能需要几秒钟，因此我们添加了 PeekMessage 调用以查看用户是否按下了键，因此我们可以中断该绘制并开始下一个绘制.我们几乎没有意识到 Windows 可以开始处理我们的消息.将真正的绘画工作放在一个单独的线程中将是一个重大的重构......我们正在尝试查看是否按下了特定的键，或者是否旋转了鼠标滚轮或单击了鼠标按钮，以中断渲染.
Painting can take seconds in our application, so we added the PeekMessage call to see if the user hit a key, so we could interrupt that painting and start up the next one. Little did we realize that Windows could start processing messages on us. It'd be a major refactoring to put the real work of painting in a separate thread... We're trying to see if specific keys were pressed, or if the mouse wheel rotated or mouse buttons were clicked, to interrupt rendering.
我尝试过专门添加代码来防止重入，然后将绘制消息重新注入队列等.这一切都非常麻烦，并且在某些情况下效果不佳.
I've tried adding code specifically to prevent re-entrancy, and then re-injecting paint messages into the queue, etc. It's all very kludgey, and there are cases where it doesn't work well.
有什么标志可以添加到 PeekMessage 调用中吗?我在 MSDN 上的文档中没有看到任何新内容.我真的需要一个不处理消息的 PeekMessage.帮助！
Is there some flag I could add to the PeekMessage call? I didn't see anything new in the documentation on MSDN. I really need a PeekMessage that doesn't process messages. Help!
推荐答案
也许我错过了明显的，但是 规范非常冗长，它会这样做:
Perhaps I'm missing the obvious, but the spec is pretty verbose that it will do so:
PeekMessage 函数 调度传入发送的消息，检查已发布的线程消息队列消息，并检索消息(如果任何存在).
...
在这次通话中，系统提供待处理的非排队消息，即发送到 Windows 拥有的消息使用 SendMessage 调用线程，发送消息回调，SendMessageTimeout，或SendNotifyMessage 函数.那么匹配的第一个排队消息检索指定的过滤器.该系统也可以处理内部事件.如果没有指定过滤器，消息在以下顺序:
- 已发送消息
- 发布的消息
- 输入(硬件)消息和系统内部事件
- (再次)发送消息
- WM_PAINT 消息
- WM_TIMER 条消息
检索输入消息之前发布消息，使用 wMsgFilterMin和 wMsgFilterMax 参数.
To retrieve input messages before posted messages, use the wMsgFilterMin and wMsgFilterMax parameters.
这篇关于有没有像 PeekMessage 这样不处理消息的函数?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！