HELP: Handling WM_SHOWWINDOW when window opened SW_SHOWMAXIMIZED

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I've verified that the WM_SHOWWINDOW handler OnShowWindow() is not
called when ShowWindow is called with SW_SHOWMAXIMIZED. I created a
dummy MFC app (doc/view and no doc/view) and reproduced the behavior.
So, here is what I have (simplified)...

MFC app with no doc/view support.

CMyWinApp::InitInstance()
{
...
pMainFrame->ShowWindow(m_nCmdShow);
pMainFrame->UpdateWindow();
...
}

CMainFrame::OnShowWindow(...)
{
// Not called when m_nCmdShow == SW_SHOWMAXIMIZED!!
}

This seems to be the designed behavior. Does anyone know why? What
message can I handle in this case to know when the window is shown on
screen?

Posted 4-Mar-14 18:22pm

imrankle

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Sergey Alexandrovich Kryukov 5-Mar-14 1:31am

Please do CodeProject search with most recent answers on top. I recently saw a very similar question.
—SA

2 solutions

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bling · Answer 1 · 2014-03-05T06:07:00

Please read the MSDN documentation on WM_SHOWWINDOW.

http://msdn.microsoft.com/en-us/library/windows/desktop/ms632645%28v=vs.85%29.aspx[^]

SQL

The WM_SHOWWINDOW message is not sent under the following circumstances:

*  When a top-level, overlapped window is created with the WS_MAXIMIZE or WS_MINIMIZE style.
*  When the SW_SHOWNORMAL flag is specified in the call to the ShowWindow function.

«_Superman_» · Answer 2 · 2014-03-05T18:47:00

Solution 2

I just tried this with an MFC SDI application and it does call CMainFrame::OnShowWindow when using m_pMainWnd->ShowWindow(SW_SHOWMAXIMIZED);
You could also create a handler for WM_SIZE (CMainFrame::OnSize) to do your processing although it would be called multiple times.

Posted 5-Mar-14 18:47pm

«_Superman_»