Solution: message box is hide behind window unless pressing ALT

最新推荐文章于 2020-08-02 18:00:57 发布

原创最新推荐文章于 2020-08-02 18:00:57 发布 · 750 阅读

0 ·

CC 4.0 BY-SA版权

GUI 同时被 3 个专栏收录

11 篇文章

订阅专栏

C/C++/MFC

8 篇文章

订阅专栏

Fix

5 篇文章

订阅专栏

本文讨论了WM_PAINT消息处理问题及其解决方法，包括通过注释、实现绘图函数或调用默认窗口处理程序来修复问题。具体原因可能与Windows内部处理无效区域有关。

This is due to the problematic message handling for WM_PAINT. See http://www.experts-exchange.com/Microsoft/Development/Q_22767210.html for more details.

The suggested solutions:

hm, it's strange - with some try and error I found it seems to have something to do with the WM_PAINT message handling:

If you
a) comment out the 'case WM_PAINT ... break;' or
b) implement a painting with 'BeginPaint(...);...EndPaint();' or
c) call 'return DefWindowProc(hwnd, msg, wparam, lparam);' in the WM_PAINT-case
the message box appears as expected ...

Unfortunateley I can't really tell you why this is - I guess it may have to do something with Windows-internal handling of invalidated regions to draw to ...