Comments on: How to disable maximizing the dialog from Task manager?

By: James E

James E — Mon, 27 Jul 2009 17:35:54 +0000

One way to solve the issue that Knjaz brings up is to use the GetWindowPlacement API instead to get the normal restored-position rect.

void CRabbitDlg::OnGetMinMaxInfo( MINMAXINFO FAR* pMinMaxInfo )
{
WINDOWPLACEMENT lpwndpl;
GetWindowPlacement(&lpwndpl);
CRect WindowRect(&lpwndpl.rcNormalPosition);

// Set the maximum size. Used while maximizing.
pMinMaxInfo->ptMaxSize.x = WindowRect.Width();
pMinMaxInfo->ptMaxSize.y = WindowRect.Height();

// Set the x,y position after maximized.
pMinMaxInfo->ptMaxPosition.x = rect.left;
pMinMaxInfo->ptMaxPosition.y = rect.top;
}

By: Knjaz Drocheslav

Knjaz Drocheslav — Tue, 09 Jun 2009 08:34:15 +0000

There is one more issue with Jijo’s solution.
Lets’ imagine we first minimize a window from TaskManager, then maximize it. Since window is initially in minimized state:

RECT rect = { 0 };
GetWindowRect( &rect ); /*window is curently minimized, rect will not contain valid coordinates.*/
CRect WindowRect( &rect );

// Set the maximum size. Used while maximizing.
pMinMaxInfo->ptMaxSize.x = WindowRect.Width();
pMinMaxInfo->ptMaxSize.y = WindowRect.Height();
/*Invalid values (likely, zeroes?) are placed in pMinMaxInfo->ptMaxSize.x,y*/

// Set the x,y position after maximized.
pMinMaxInfo->ptMaxPosition.x = rect.left;
pMinMaxInfo->ptMaxPosition.y = rect.top;
/*Invalid values (likely, some negative numbers) are placed in pMinMaxInfo->ptMaxPosition.x,y*/

As a result, the window will never be displayed again.

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By: Jijo.Raj

Jijo.Raj — Mon, 25 Aug 2008 09:05:37 +0000

Wow!!! Thanks a lot for the info. I’ll update the post.

Regards,
Jijo.

By: Nishad S

Nishad S — Mon, 25 Aug 2008 09:03:18 +0000

Use this to avoid the titlebar painting problem…

void CRabbitDlg::OnWindowPosChanging(WINDOWPOS FAR* lpwndpos)
{
ModifyStyle( WS_MAXIMIZE, 0 );
CDialog::OnWindowPosChanging(lpwndpos);
}