Re: Windows shutdown hanging - Getting desperate!

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From: David Meier (DavidMeier_at_discussions.microsoft.com)
Date: 09/23/04 

Date: Thu, 23 Sep 2004 07:35:09 -0700

Hi Nicholas,

thanx a lot for your reply. This is an annoying little big problem! I
reworked the WndProc Method to this:

protected override void WndProc(ref Message m)
{
  int WM_QUERYENDSESSION = 0x11;
  int WM_ENDSESSION = 0x16;
  // Carry on with the message.
  base.WndProc(ref m);
  if (m.Msg == WM_QUERYENDSESSION)
  {
    m.Result = (IntPtr) 1;
  }
  else if (m.Msg == WM_ENDSESSION)
  {
    this.Close();
  }
}

However, it does not change anything. The application closes but shutdown
aborts as well. I noticed that the WM_QUERYENDSESSION message never triggers,
only the WM_ENDSESSION does. I am closing the applications log file (not
shown in the code above) before issuing "this.Close()" and therefore I see
what triggers the applications exit. I guess this does not make a difference,
does it?

Dave.

"Nicholas Paldino [.NET/C# MVP]" wrote:

> David,
>
> You need to set the return value when the message is WM_QUERYENDSESSION.
> Basically, your code should look like this:
>
> // Process the message normally.
> base.WndProc(ref m);
>
> // If the result is to query to end the session, set the return value to 1.
> if (m.Msg == WM_QUERYENDSESSION)
> {
> // Return true for the result.
> m.Result = 1;
> }
> else if (m.Msg == WM_ENDSESSION)
> {
> // Close the form.
> this.Close();
> }
>
> Hope this helps.
>
>
> --
> - Nicholas Paldino [.NET/C# MVP]
> - mvp@spam.guard.caspershouse.com
>
>
> "David Meier" <DavidMeier@discussions.microsoft.com> wrote in message
> news:1A42A7F2-1531-483E-9ECA-406BD9D3B518@microsoft.com...
> >I have an application running in the background, visible only by a notify
> > icon in the system tray. I learned from other posts to catch the
> > WM_QUERYENDSESSION and WM_ENDSESSION messages. Now, when I want to
> > shutdown/restart the computer the application exits but the shutdown
> > process
> > does not continue anymore. Here's what I've done:
> >
> > protected override void WndProc(ref Message m)
> > {
> > // Exit message code.
> > int WM_QUERYENDSESSION = 0x11;
> > int WM_ENDSESSION = 0x16;
> > if (m.Msg == WM_QUERYENDSESSION || m.Msg == WM_ENDSESSION)
> > {
> > base.WndProc(ref m);
> > this.Close();
> > }
> > else
> > {
> > base.WndProc(ref m);
> > }
> > }
> >
> > The MainForm is started in normal state and is set to invisible after
> > start.
> > PLEASE HELP ME!
>
>
>

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