ios4 - iOS: Is it possible to take screenshots while running as a background task?

Question

I want to take screenshots of any running app, while my app is in the background.

I know I can take screenshots in iOS using:

UIGraphicsBeginImageContext(webview.frame.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);

But this is not really possible in a background task as UIGraphicsGetCurrentContext returns NULL and I want a screenshot of the running app and not my view. Is there any other way?

Answer 1

When running the stock OS, the iOS app security sandbox will prevent your app from having access to the contents of the view of any other app.