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Overrule Alt-F4 event

Posted on 1998-08-26
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Last Modified: 2010-04-04
I want to prevent closing my delphi application by ALT-F4. I think that I have to write an Windowsmessage event handler, but how ?
Can i use the WM_CLOSE message to detect this ?
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Question by:rene041697
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erajoj earned 100 total points
ID: 1337801
Hi,
Do the following simple steps:

1. Set Form's proterty KeyPreview := True;

2. Implement this simple event handler:

   procedure TForm1.FormKeyDown(Sender: TObject; var Key: Word;
     Shift: TShiftState);
   begin
     if ( ( Key = VK_F4 ) and ( ssAlt in Shift ) )
     then Key := 0;
   end;

Note: this doesn't prevent the window from closing with the system menu or the close button.

/// John
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