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Windows 10: How see behind full screen form inside a new desktop create by a 3rd's application

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I have a normal application example (the code is this, but not is a service) that make screenshots of a non secure active desktop created by a 3rd's application.


For example:




This 3rd application is a "browser application" that uses CEF to render the websites.

My goal is open a fullscreen form in foreground (covering all screen above) and be able to make screenshot of the content behind of this fullscreen form (the 3rd application).


I searched by some hint about this and found these similar discussions:



I also had tested using PrintWindow api (to capture only the 3rd's application), but this results in a black screen (in chromium content) because probably the 3rd's application uses CEF with hardware acceleration resource active.


For example:




All works fine in Windows XP, 7 (disabling Aero theme) - with ALPHABLEND = TRUE on fullscreen Form.


  • The second discussion found seems more near of solution to my trouble, because this uses a api apparently able to remove a determinated window of screencapture.

I tested this example left by author, works only if call ConfigMag() prodecure after routine that contains SetThreadDesktop api



if InputDesktopSelected then
    else if SelectDesktop(nil) then // result of SelectDesktop() is a routine that calls SetThreadDesktop 
  on E: Exception do
    Writeln(E.ClassName, ': ', E.Message);

Already if i want make screenshots periodically, this will fails like was said by author. Then my trouble still not was solved.




Edited by flashcoder

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@flashcoderPlease, consider uploading images to the forum. This way they will be here as long as the forum exists. Imgur might delete those images some time in the future, or imgur might stop the service or terms of use or whatever, rendering your post less useful for future generations.

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59 minutes ago, Микола Петрівський said:

If I had to interact with another desktop, I would start separate process there. Probably even separate EXE-file. Then i would send it commands somehow (tethering ?) and get results back.

Then not exist a solution to make screenshot continuously in a new desktop (behind fullscreen Form) on Win 10 with Magnification api + SetThreadDesktop? only because is created a window "Magnification Host".


I also tried create this "Magnification Host" window in a separated thread, and make the screenshots in other thread, but this also not worked:classic_sad:

Edited by flashcoder

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