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Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

{ 
  To detect a Windows Shutdown, you must trap the 
  WM_EndSession message. 
  Declare a message handling procedure in your Form's Private section. 

  Um herauszufinden, ob Windows heruntergefahren wird, muss 
  die WM_EndSession abgefangen werden. 
}


 type
   TForm1 = class(TForm)
   private
     procedure WMEndSession(var Msg: TWMEndSession); message WM_ENDSESSION;
   public
   end;

 implementation

 {$R *.DFM}

 procedure TForm1.WMEndSession(var Msg: TWMEndSession);
 begin
   if Msg.EndSession = True then
     ShowMessage('Windows is shutting down!');
   inherited;
 end;