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Delphi source code for Windows >> Prevent Alt+F4


Category: Windows
Title: Prevent Alt+F4
Date added: 15.03.2006
Hits: 11063


public
  
procedure AppMessage(var Msg: TMSG; var HAndled: Boolean);
end;
{...}
implementation
{...}

procedure TForm1.FormCreate(Sender: TObject);
begin
  Application.OnMessage := AppMessage;
end;

procedure TForm1.AppMessage(var Msg: TMSG; var Handled: Boolean);
begin
  Handled := False;
  case Msg.Message of
    WM_SYSKEYDOWN:
      if Msg.wParam = VK_F4 then
        Handled := True; // don't allow ALT-F4
  end;
end;


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