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Delphi source code for Windows >> Prevent Alt+F4

Category: Windows
Title: Prevent Alt+F4
Date added: 15.03.2006
Hits: 12200

procedure AppMessage(var Msg: TMSG; var HAndled: Boolean);

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

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

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