Does Form_Unload Run When Windows Exits?
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From: Rick Raisley on 24 Jul 2008 10:31 I'm trying to have my app log status on a process that can take a long time. Another app will read that status, and act accordingly. I can log (to a file) when the first app starts, and when it completes. The problem is, if Windows exits before the first app can complete its job, the completion log will not be written. The next time Windows starts, the second app will then read the file, and cannot tell if the first app has started but is not yet done, or if it ended, due to Windows shutting down, and is no longer running. I guess I could check to see if the first app is running (might even be the best way). But I was thinking of a simpler way, IF the Form_Unload event runs in my app when Windows shuts down. If it does, I can, using the Escape value, write a log file that indicates the app's operation was not complete. Or even delete the log entry that the app has started. In any event, if Form_Unload fires on Windows shutdown, I can log that the operation was not complete, and needs to be restarted. So, does anyone know if Form_Unload and/or Form_QueryUnload fire when Windows shuts down the programs? I kind of assume it will (unless the PC is just powered down), but don't know (without making an app and testing, at least). -- Regards, Rick Raisley heavymetal-A-T-bellsouth-D-O-T-net
From: Bob Butler on 24 Jul 2008 10:35 "Rick Raisley" <heavymetal-A-T-bellsouth-D-O-Tnet> wrote in message news:uvzRYoZ7IHA.4112(a)TK2MSFTNGP05.phx.gbl... <cut> > So, does anyone know if Form_Unload and/or Form_QueryUnload fire when > Windows shuts down the programs? I kind of assume it will (unless the PC > is just powered down), but don't know (without making an app and testing, > at least). The events do run, as a quick test would have shown, but users could still terminate your app or a system crash could stop it early or.... it'd probably be better to make a log entry somewhere on completion (or even build the file under a temporary name and then rename it as the last step).
From: Rick Raisley on 24 Jul 2008 11:20 "Bob Butler" <noway(a)nospam.ever> wrote in message news:ueg8CrZ7IHA.616(a)TK2MSFTNGP02.phx.gbl... > > "Rick Raisley" <heavymetal-A-T-bellsouth-D-O-Tnet> wrote in message > news:uvzRYoZ7IHA.4112(a)TK2MSFTNGP05.phx.gbl... > <cut> >> So, does anyone know if Form_Unload and/or Form_QueryUnload fire when >> Windows shuts down the programs? I kind of assume it will (unless the PC >> is just powered down), but don't know (without making an app and testing, >> at least). > > The events do run, as a quick test would have shown, but users could still > terminate your app or a system crash could stop it early or.... it'd > probably be better to make a log entry somewhere on completion (or even > build the file under a temporary name and then rename it as the last > step). > I'm actually already doing that. But I have to determine, from another program, whether it is still running, but has not yet finished, or if it was ended before completion. The log entry works fine to tell the other app it has completed its task. But if the log entry is not there, did is the app still running and hasn't finished yet, or was it interrupted by a shutdown before it was complete? Using the Query_Unload event, if it fires on Windows shutdown, I can do that. If it doesn't fire, then it's tougher. -- Regards, Rick Raisley heavymetal-A-T-bellsouth-D-O-T-net
From: expvb on 24 Jul 2008 11:44 "Rick Raisley" <heavymetal-A-T-bellsouth-D-O-Tnet> wrote in message news:%23AQVSEa7IHA.1468(a)TK2MSFTNGP05.phx.gbl... > I'm actually already doing that. But I have to determine, from another > program, whether it is still running, but has not yet finished, or if it > was ended before completion. The log entry works fine to tell the other > app it has completed its task. But if the log entry is not there, did is > the app still running and hasn't finished yet, or was it interrupted by a > shutdown before it was complete? Using the Query_Unload event, if it fires > on Windows shutdown, I can do that. If it doesn't fire, then it's tougher. Query/Unload always fire unless someone ended the process.from Task Manager or similar tools. However, in a terminal services session, I noticed that MsgBoxes are not shown at Unload event when the session is logged off. It seems under a terminal services session(Windows 2000) that MessageBox fails and so you get the impression that Unload events are not called if the message box is the only means by which you tell if the event happened or not. You can try this with Notepad, type some text, then log the session off. You will notice that the save as prompt didn't show up and Notepad disappeared from the screen. So use other methods to tell if the event fired, especially under Terminal Services or fast user switching.
From: kpg on 24 Jul 2008 12:45
> I'm actually already doing that. But I have to determine, from another > program, whether it is still running, but has not yet finished, or if > it was ended before completion. The log entry works fine to tell the > other app it has completed its task. But if the log entry is not > there, did is the app still running and hasn't finished yet, or was it > interrupted by a shutdown before it was complete? Using the > Query_Unload event, if it fires on Windows shutdown, I can do that. If > it doesn't fire, then it's tougher. You could (over)write a timestamp to a file every so often (60 seconds) and if the time stamp is old you can assume the program is no longer running. |