upsie daisy :D wrong question. hope someone with enough power will delete these 2 comments.
.sorry
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Question
SetWindowLong without flickering
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,'Untitle
if h<>0 then
begin
style:=GetWindowLong(h,GWL
SetWindowLong(h,GWL_EXSTYL
SetLayeredWindowAttributes
//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!
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Answers
when youre adding the alpha-layer functionality to the window, its canvas has another structure. hence, the entire window has to be completely re-drawn. this cant be prevented. even a 100% visible window consumes a lot more cpu-cycles when parts of it must be redrawn (try to drag such a window around, it shouldnt be as smooth as normal windows).
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.
I will leave the following recommendation for this question in the Cleanup Zone:
Accept AmigoJack's comment as answer {http:#17454156}
Any objections should be posted here in the next 4 days. After that time, the question will be closed.
ziolko
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by: ciulyPosted on 2006-09-04 at 14:04:47ID: 17451869
quote from MSDN: http://msdn.microsoft.com/
"Request ownership of the mutex semaphore; then retry the command. You may have to contact the supplier of the running application."
I don't think there is any way you can get a hold of a mutex to release it as this would be a major security risk (there are system resources that rely on mutexes ;) )