Windows won't shut down

[Claire]

Running XP pro, SP2. Visual studio .NET 2003. App written in C#

I have written an application that hides itself when run and shows a
notification icon in the system tray.
If the main form is visible/restored to the desktop, and I tell windows to
restart, windows shuts down fine.
If the main form is minimized to the tray and I tell windows to restart,
other desktop apps close down fine but my program's icon remains sat in the
system tray, windows doesn't close down and there's no error messages.
In normal use, I only allow the app to close down from a right button mouse
activated menu when the app sits in the task bar.

The code for the Closing event is as follows. The menu "close application"
click changes the DialogResult from None to Cancel.
I tested and found that the Closing event is being called in both cases and
,afaik, the result should be ignored anyway as Windows OS is being closed
down.
private void frmOptions_Closing(object sender,
System.ComponentModel.CancelEventArgs e)

{

if (DialogResult == DialogResult.None)

{

e.Cancel = true;

WindowState = FormWindowState.Minimized;

}


}

 

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

Claire,

I don't think that is the case. When windows is shutting down, if your
app cancels the request to shut down, then it will halt the shutdown.

I think that you should override the WndProc method of your form, and
then handle the WM_QUERYENDSESSION and WM_ENDSESSION messages yourself,
indicating that it is ok to shut down when you get them. I think that the
cancel request from your Closing event handler is being channeled back in
response to these messages.

Hope this helps.

 

[Guest]

Hi Nicholas:

I have a similar issue that Claire has. But I have no idea how to implement
WndProc.

Can you show me how to implement WndProc ?

Thanks

David Kao

Claire,

I don't think that is the case. When windows is shutting down, if your
app cancels the request to shut down, then it will halt the shutdown.

I think that you should override the WndProc method of your form, and
then handle the WM_QUERYENDSESSION and WM_ENDSESSION messages yourself,
indicating that it is ok to shut down when you get them. I think that the
cancel request from your Closing event handler is being channeled back in
response to these messages.

Hope this helps.

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

Running XP pro, SP2. Visual studio .NET 2003. App written in C#

I have written an application that hides itself when run and shows a
notification icon in the system tray.
If the main form is visible/restored to the desktop, and I tell windows to
restart, windows shuts down fine.
If the main form is minimized to the tray and I tell windows to restart,
other desktop apps close down fine but my program's icon remains sat in
the
system tray, windows doesn't close down and there's no error messages.
In normal use, I only allow the app to close down from a right button
mouse
activated menu when the app sits in the task bar.

The code for the Closing event is as follows. The menu "close application"
click changes the DialogResult from None to Cancel.
I tested and found that the Closing event is being called in both cases
and
,afaik, the result should be ignored anyway as Windows OS is being closed
down.
private void frmOptions_Closing(object sender,
System.ComponentModel.CancelEventArgs e)

{

if (DialogResult == DialogResult.None)

{

e.Cancel = true;

WindowState = FormWindowState.Minimized;

}


}

 

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

David,

It's just an override on your main form:

protected override void WndProc(ref Message m)
{
// Perform pre-processing here.

// Call the base.
base.WndProc(ref m);

// Post-processing here.
}

What you do for the pre or post processing is up to you.

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

Hi Nicholas:

I have a similar issue that Claire has. But I have no idea how to
implement
WndProc.

Can you show me how to implement WndProc ?

Thanks

David Kao

Claire,

I don't think that is the case. When windows is shutting down, if
your
app cancels the request to shut down, then it will halt the shutdown.

I think that you should override the WndProc method of your form, and
then handle the WM_QUERYENDSESSION and WM_ENDSESSION messages yourself,
indicating that it is ok to shut down when you get them. I think that
the
cancel request from your Closing event handler is being channeled back in
response to these messages.

Hope this helps.

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

Running XP pro, SP2. Visual studio .NET 2003. App written in C#

I have written an application that hides itself when run and shows a
notification icon in the system tray.
If the main form is visible/restored to the desktop, and I tell windows
to
restart, windows shuts down fine.
If the main form is minimized to the tray and I tell windows to
restart,
other desktop apps close down fine but my program's icon remains sat in
the
system tray, windows doesn't close down and there's no error messages.
In normal use, I only allow the app to close down from a right button
mouse
activated menu when the app sits in the task bar.

The code for the Closing event is as follows. The menu "close
application"
click changes the DialogResult from None to Cancel.
I tested and found that the Closing event is being called in both cases
and
,afaik, the result should be ignored anyway as Windows OS is being
closed
down.
private void frmOptions_Closing(object sender,
System.ComponentModel.CancelEventArgs e)

{

if (DialogResult == DialogResult.None)

{

e.Cancel = true;

WindowState = FormWindowState.Minimized;

}


}

 

[Claire]

Thanks Nicholas,
I don't believe my app is receiving this message.
It's very difficult to track down as you can't run the app in the debugger
at that level of shutdown.
I stuck a message box in wndproc to show on either message and it didn't
fire.