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8.4

SetWindowLong without flickering

Asked by rogerrr in Delphi Programming

Tags: setwindowlong

Hello!

If i set the style of a foreign window (e.g. Notepad) to WS_EX_LAYERED then the window flickers.

Example:

var
 h: Hwnd;
 style: integer;
begin
 h:=FindWindow(nil,'Untitled - Notepad');
     if h<>0 then
     begin
     style:=GetWindowLong(h,GWL_EXSTYLE);

   SetWindowLong(h,GWL_EXSTYLE,GetWindowLong(h,GWL_EXSTYLE) or WS_EX_LAYERED);
     SetLayeredWindowAttributes(h,0,255,LWA_ALPHA);

     //Restore
     SetWindowLong(h, GWL_EXSTYLE, style);
     SendMessage(h, WM_SETREDRAW, 1, 0);
     RedrawWindow(h, nil, 0, RDW_ERASE or RDW_FRAME or RDW_INVALIDATE or RDW_ALLCHILDREN);
    end;
  end;


I tried to hook some functions and my experiences are following: After the calling of SetWindowLong (after WM_STYLECHANGING and before WM_STYLECHANGED) the system hides the window for a moment and when it comes back the background is black. I don't know how can i prevent this hiding/redrawing method.


Is there any way to prevent this flickering effect after the SetWindowLong function?

Thanks in advance!
[+][-]09/04/06 02:04 PM, ID: 17451869Expert Comment

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[+][-]09/04/06 02:05 PM, ID: 17451871Expert Comment

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[+][-]09/05/06 01:55 AM, ID: 17454156Accepted Solution

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About this solution

Zone: Delphi Programming
Tags: setwindowlong
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Solution Provided By: AmigoJack
Participating Experts: 3
Solution Grade: A
 
[+][-]08/16/07 02:22 PM, ID: 19712596Expert Comment

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