🚀 go-pugleaf

Hi,
A small  explanation and the things I'd try.
When the user decide to stop Windows, Windows sends two messages to the
main form of your application
  WM_QUERYENDSESSION in order to ask the application if it agrees to end.
and then
  WM_ENDSESSION to indicate whether the session is (or is not) going to end

So in the header file of the main form , you must declare :
private:	// user declarations
  .......
   MESSAGE void __fastcall HandleQueryEndSession(TMessage&) ;
   MESSAGE void __fastcall HandleEndSession(TMessage&) ;
  BEGIN_MESSAGE_MAP
   MESSAGE_HANDLER(WM_QUERYENDSESSION,TMessage,HandleQueryEndSession) ;
   MESSAGE_HANDLER(WM_ENDSESSION,TMessage,HandleEndSession) ;
  END_MESSAGE_MAP(TForm) ;
  bool YesITerminate ; // that is one possible way to manage, you
                       // must put it to false in the constructor.

And in the cpp file :
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner) : TForm(Owner)
{
   YesITerminate=false ;
   .....
}
//---------------------------------------------------------------------------
MESSAGE void __fastcall TForm1::HandleQueryEndSession(TMessage &Msg)
{
   if(....)
     Msg.Result=1 ;   // in case the application agrees to stop
   else
     Msg.Result=0 ;   // in case the application does not agree to stop
}
//---------------------------------------------------------------------------
MESSAGE void __fastcall TForm1::HandleEndSession(TMessage & Msg)
{
   if(Msg.WParam==TRUE)  // Windows is going to stop (all the running
   {             // processes answered Msg.Result=1 to the first message)
     YesITerminate=true ;
     // here you close open files etc ... you can, for example,
     // remove the icon of your application from the tray icon
   }
   else                     // Windows won't stop
   {

     ..... // you can tell the user want you want, perhaps there is 
nothing to do
   }
   Msg.Result=0 ;           // I think that's mandatory, I'm not sure
}
//---------------------------------------------------------------------------

  you also write an OnCloseQuery event manager :
/---------------------------------------------------------------------------

void __fastcall TForm1::FormCloseQuery(TObject *Sender, bool &CanClose)
{
   if(!YesITerminate)
     CanClose=false ; // the choice may be more complicated ...
}
/---------------------------------------------------------------------------

I hope that is understandable
Michel.

Grety wrote:
> I found the text below but I couldn't understand it
> Someone please tell me. thx
> //-----------------------------------------
> Respond correctly to Windows shutdown WM_QUERYENDSESSION
> Posted: 21 Jan 2005 06:48 AM
> I have an application which minimizes to systemtray when the close button is
> pressed. How ever when shutting down windows the application keeps windows
> from doing so.
> I have made the following implementation i order to catch the windows
> message WM_QUERYENDSESSION
> 
> protected override void WndProc(ref Message m)
> {
>     base.WndProc(ref m);
>     // WM_QUERYENDSESSION
>     if (m.Msg == 0x11) {
>         //close up
>         Application.Exit();
>     }
> }
> 
> Now my application shutsdown (I have checked in taskmanager) but still
> windows keeps running. Second time I ask for a shutdown it works. So my
> question is how do I respond correctly to the windows shutdown request?
> //-----------------------------------------
> 
>