[DUG] SetWindowPos HWND_TOPMOST

[John Bird]

Not just Delphi - its an ancient Windows problem AFAIK.   Even in Windows 7 I have seen a control panel applets puts a modal dialog behind the window - often the best solution is Windows+D  (show desktop) and go thru all windows with alt+Tab and usually the hidden modal dialog is found.   Usually.

John

 
HI have seen this even happen in D2007 ! so I am not sure if it has been sorted in later Delphi versions. I have seen other Windows apps. Not written in Delphi Exhibit the same thing, so is it a Delphi thing, or a Windows thing?? P.s this happens on XP, Vista and Win7 that I have noticed.

 

Jeremy

 

From: delphi-bounces at delphi.org.nz [mailto:delphi-bounces at delphi.org.nz] On Behalf Of Ross Levis
Sent: Friday, 20 August 2010 22:04
To: 'NZ Borland Developers Group - Delphi List'
Subject: [DUG] SetWindowPos HWND_TOPMOST

 

I have a window in my app which needs to be set to stay on top of all others.  In D7, if a modal dialog is activated from this window such as a TOpenFile, it appears underneath the window.  I believe later versions of Delphi resolve this problem.

 

I got around the issue by using SetWindowPos with HWND_NOTOPMOST just before the dialog is activated, and set it back again afterwards.

 

This works well generally, but a few users have complained of the entire app hanging either before the dialog appears or after it closes.  I've noticed this maybe twice over the last few years using XP.

 

Is this an XP bug or Delphi getting confused?

 

Perhaps I should try a Application.ProcessMessages after the SetWindowsPos.

 

Ross.



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