Running Programs Stop

[Guest]

Is there some way to be notified when the user stops my program via
Settings->System->Memory->Running Programs->Stop?

Currently, my application does not shutdown cleanly when terminated this way
(various problems can occur - file not completed, associated background
programs not shutdown, etc.)

 

[Guest]

I've not checked, but it likely sends a WM_CLOSE to your top level Form. An
IMessageFilter would get that.

-Chris

 

[Guest]

Well this sort of works. It appears that I can override OnClosing and then
set e.Cancel to true to prevent immediate termination. However, the system
brings up a dialog (not responding blah blah blah) -- and now it is a race,
can I get correctly shutdown before the user hits "End Now".

So, obviously, this leads to - can I suppress the dialog? Or possibly
"respond" in such a way that the dialog does not appear? Or change the
language of the dialog to ask the user to wait? The language of the dialog
appears to indicate that I can "respond" in some way...

 

[Chris Tacke, MVP]

I was afraid that might happen. What it likely does (this is how I'd do it
anyway) is it first is nice and sends a WM_CLOSE toallow the app to clean up
and exit gracefully. If after a period of time you see the Window is still
there, you assume it's deadllocked and you use TerminateProcess on it.
They're nice and give you a dialog - I don't know of any way to suppress it.
So your clean up takes a while? Any way to shorten that?

-Chris

 

[Guest]

Thank you all, I think I have found a solution, here is a summary of what I
think I've learned

1. In all the forms of your application, override OnClosing and respond by
setting e.Cancel to true - this prevents immediate termination

2. If you change the form in response to the OnClosing (for example, if
Form1 gets the OnClosing, make Form1 invisible, and bring up Form2), this
appears to give you all the time you need to shutdown.

3. Do whatever you need to clean up for termination (just like you actually
had an exit or quit in a normal application).

4. Exit your application.

The only side effect seems to be that the "not responding" dialog still
comes up after you terminate, but I can live with that.

In my experiments, recieving the OnClosing in Form1, bringing up Form2
(actually named the same thing as Form1) waiting 20, 30, 40 seconds
(simulating shutdown tasks) while Form2 was up before exiting my application
seemed to work.

It would be nice if you could do something that basically told the system,
"Yes I'm still alive and no, I do not want to shutdown now" but if the above
works in my real application I can live without it.

Again, thanks for the help....

 

[Guest]

As a final followup...

Luckily, since all my forms derive from a base class I was able to override
all my forms with OnClosing in one place. I added a static bool that
indicates whether I am processing a Program Running Stop message already so I
don't recursively try to do my shutdown tasks...duh. This totally worked. The
system dialog did NOT come up, but I think that was because the MainForm (the
one used with Application.Run) was not the form that recieved the OnClosing.
Just a guess.

So, cool, thanks again