whats new ¦  programming tips ¦  indy articles ¦  intraweb articles ¦  informations ¦  links ¦  interviews
 misc ¦  tutorials ¦  Add&Win Game

Tips (1548)

Database (90)
Files (137)
Forms (107)
Graphic (116)
IDE (21)
Indy (5)
Internet / LAN (131)
IntraWeb (0)
Math (76)
Misc (127)
Multimedia (45)
Objects/
ActiveX (51)

OpenTools API (3)
Printing (35)
Strings (83)
System (268)
VCL (243)

Top15

Tips sort by
component


Search Tip

Add new Tip

Add&Win Game

Advertising

12 Visitors Online


 
...prevent Alt+F4?
Autor: Simon Grossenbacher
Homepage: http://www.swissdelphicenter.ch
[ Print tip ]  

Tip Rating (6):  
     


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

{...}

implementation

{...}

procedure TForm1.FormCreate(Sender: TObject);
begin
  
// set your applications message handler to your new one
  
Application.OnMessage := AppMessage;
end;

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

//Or Write in the OnCloseQuery handler CanClose :=  False
//Oder schreibe im OnCloseQuery Ereignis CanClose := False


 

Rate this tip:

poor
very good


Copyright © by SwissDelphiCenter.ch
All trademarks are the sole property of their respective owners