How to get notified when MediaCapture stops capturing after the app is switched to the background

Question

It is fine if the behavior is by design though it is not ideal.  How can an app get notified when the video capturing stops?

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Hong

Answer 1

That's going to happen because the app gets suspended. It's by design because apps should not be spying on the users without them knowing.  I would handle the OnSuspend state and stop the recording at that point.

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Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.

NOTE: If I ask for code, please provide something that I can drop directly into a project and run (including XAML), or an actual application project. I'm trying to help a lot of people, so I don't have time to figure out weird snippets with undefined objects and unknown namespaces.

Answer 2

Thanks for the tip, Matt.

That is what I thought.  I have heard that it takes a few seconds for the suspension to happen.  However, the capture stops immediately after the app is sent to the background.  In other words, if I send the app to the background and bring it back in a fraction of second, the video capture stops.  If I use debug mode which prevents suspension (Am I right?), the video capture stops and  Current_Suspending is never called.   

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Hong

Answer 3

Hello Hong,

The audio stops playing or recording when the app looses focus as well as when it gets suspended. This is by design. Try handling the Page.LostFocus event.

I hope this helps,

James

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Windows SDK Technologies - Microsoft Developer Services - http://blogs.msdn.com/mediasdkstuff/

Answer 4

Thanks a lot for the clarification.

I recently added a handler of Window.Current.VisibilityChanged to manage this.  Could you let me know if it is equivalent to Page.LostFocus event or the later has some advantages.

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Hong

Answer 5

Hello Hong,

VisibilityChanged should work too.

-James

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Windows SDK Technologies - Microsoft Developer Services - http://blogs.msdn.com/mediasdkstuff/