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02.14.2008 at 09:30PM PST, ID: 23165261
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Window XP Tablet Edition not releasing application on close. C/C++

Tags: Microsoft, XP Tablet Edition, 2005, C++
Hi all,

I am working on an application written in C/C++.  With Windows XP Professional and Vista, the application quits perfectly, but with XP Tablet Edition, the application remains in the Task Manager (even though the application panel disappears).  I have also traced through the code and found that the application does make it past exit(0). However, when I add breakpoints in the code, the application shuts down nicely.  Similarly when I replace the breakpoints with Sleeps (using breakpoints and sleeps does not affect the application shutting down on a normal pc).

Any clues as to why this happens?

My thoughts are:
1. Dangling thread - is there a development tool that I can use to track which thread is dangling?
2. Communications - maybe that particular thread is not receiving a message to shut itself down?
3. Tablet PC Bug?

Thanks and regards,
surgio
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Question Stats
Zone: OS
Question Asked By: surgio
Solution Provided By: jkr
Participating Experts: 2
Solution Grade: B
Views: 0
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02.15.2008 at 12:03AM PST, ID: 20900058

Rank: Sage

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02.15.2008 at 09:40AM PST, ID: 20904008

Rank: Genius

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02.17.2008 at 06:38PM PST, ID: 20917173

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02.17.2008 at 07:11PM PST, ID: 20917301

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02.17.2008 at 07:25PM PST, ID: 20917367

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02.15.2008 at 12:03AM PST, ID: 20900058

Rank: Sage

Have you tried just writing a very simple hello world dialog to see how this behaves?
 
02.15.2008 at 09:40AM PST, ID: 20904008

Rank: Genius

>> but with XP Tablet Edition, the application remains in the Task Manager

Where do you end up when you choose "Debug" from the Task Manager's context menu in that situation?
 
02.17.2008 at 06:38PM PST, ID: 20917173
Thanks for your replies.

A simple Hello World program works.

I was referring to Windows Task Manager, is there an option to debug through that?  To do what you (jkr) suggested, I ran the application via Visual Studio, then tried shutting down the application to recreate the error.  The application did not shut down (as expected) then I clicked on the pause button to see where the process ends up in the code.  A green arrow points to the very last line - exit(0).

Additionally, while I first started the application via Visual Studio, Windows Task Manager indicated there were 2 threads associated with the application.  Once I click on the application to bring it into focus for the first time, the number of threads jumps to 5 and remains at that number.  This doesn't happen on XP Pro and Vista, could it be due to the tablet pc's touch screen stuff attaching itself to my application?
 
02.17.2008 at 07:11PM PST, ID: 20917301
FYI, I have found the Task Manager Extension and it gave the same result as I described in my previous entry.  Very useful extension though, thanks jkr.
 
02.17.2008 at 07:25PM PST, ID: 20917367

Rank: Genius

Hmm, if you have installed the CRT source code, you should be able to see where in 'exit()' the exection stops, that would be of interest.
Accepted Solution
 
 
02.20.2008 at 10:43PM PST, ID: 20945519
exit(0) seems to work ok so I started shifting the exit(0) backwards until it started shutting down properly.  It worked when I shifted it before CoUninitialize() which I looked up on msdn together with the CoInitialize() call at the beginning of the thread.  Read that CoInitializeEx() should be used instead of CoInitialize(), replaced it and now it shuts down correctly.  I wonder why this only becomes a problem for the tablet pc though.

Thanks for you advice jkr!
 
 
 
20080236-EE-VQP-29 / EE_QW_2_20070628