为什么我无法使用WM_NCPAINT刷新对话框，但与WM_SIZE一起正常工作？ [英] Why I am not able to refresh dialog box with WM_NCPAINT, but working fine with WM_SIZE?

问题描述

我在MFC中有对话框应用程序。要刷新对话框上的视图，我们使用WM_NCPAINT，它确实调用OnNCPaint，但有时视图不会刷新。行为并不总是可重复的。 WM_PAINT也发生了同样的行为。



当我们使用SendMessage（WM_SIZE）时，行为不可重现，并按预期工作。



在检查代码之前，我想确定，我应该使用WM_SIZE而不是WM_NCPAINT或WM_PAINT，因为它可以正常工作。

解决方案

来自 WM_PAINT [ ^ ] MSDN页面：

Quote：

WM_PAINT消息由系统生成，不应由应用程序发送

要更新或重绘窗口，请使用 UpdateWindow [ ^ ]和 RedrawWindow [ ^ ]函数。

I am having dialog box application in MFC. To refresh view on dialog box we are using WM_NCPAINT, it does call OnNCPaint, but sometimes view is not getting refreshed. Behaviour is not always reproducible. Same behaviour is happening with WM_PAINT also.

When we use SendMessage(WM_SIZE), behaviour is not reproducible, and working as expected.

Before checking in the code, I wanted to make sure, should I use WM_SIZE instead of WM_NCPAINT or WM_PAINT, because it is working fine with it.

解决方案

From the WM_PAINT[^] MSDN page:

Quote:

The WM_PAINT message is generated by the system and should not be sent by an application

To update or redraw a window use the UpdateWindow[^] and RedrawWindow[^] functions.

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