parking windows - WM_QUERYENDSESSION

[Guest]

Hi
When I use the WM_QUERYENDSESSION event to prevent closing of my app when
Windows is shut down, I get the 'windows forms parking window' appearing
which is very confusing for users.
Any ideas how to stop this?

 

[Nicholas Paldino [.NET/C# MVP]]

quilkin,

What do you mean the windows forms parking window?

 

[Dmytro Lapshyn [MVP]]

Nicholas,

There is such a hidden window created by the Framework - you can find it
with Spy++ (or a similar tool). Looks like it becomes visible under some
circumstances. The author should probably post more details on how s/he
handles the WM_QUERYENDSESSION message.

--
Sincerely,
Dmytro Lapshyn [Visual Developer - Visual C# MVP]

quilkin,

What do you mean the windows forms parking window?


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

Hi
When I use the WM_QUERYENDSESSION event to prevent closing of my app when
Windows is shut down, I get the 'windows forms parking window' appearing
which is very confusing for users.
Any ideas how to stop this?

 

[Guest]

Dmytro

Since posting my original message I haven't seen the 'parking window' again!
However for compeltenes my handling of the message is below.
Perhaps I should call the Base method in the case of WM_ENDSESSION

protected override void WndProc(ref Message m)
{
if(m.Msg==0x0011) //WM_QUERYENDSESSION
{
mainForm.shutDown = true;
Trace.WriteLine("Shutting Down - TrayIcon WndProc");
mainForm.Show();
MessageBox.Show("You must close System5 Logger before shutting down");
}
else if(m.Msg==0x0016) //WM_ENDSESSION
{
mainForm.shutDown = true;
Trace.WriteLine("Shutting Down 2 - TrayIcon WndProc");
}
else
base.WndProc(ref m);
}

Nicholas,

There is such a hidden window created by the Framework - you can find it
with Spy++ (or a similar tool). Looks like it becomes visible under some
circumstances. The author should probably post more details on how s/he
handles the WM_QUERYENDSESSION message.

--
Sincerely,
Dmytro Lapshyn [Visual Developer - Visual C# MVP]

quilkin,

What do you mean the windows forms parking window?


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

Hi
When I use the WM_QUERYENDSESSION event to prevent closing of my app when
Windows is shut down, I get the 'windows forms parking window' appearing
which is very confusing for users.
Any ideas how to stop this?