Hardware Accelaration shows black Screenshots - animation

What happens internally when Hardware Accelaration is on then all the screenshots taken during that time come out to be totally black.
I dont have any clue about that and have done some research but could not find anything.
I am trying to create an app 'X' in windows which will produce black screen as output when someone tries to take a screenshot while 'X' is on.
There are some apps which provide this functionality(like ScreenWings) but i could not figure out its working.
Is there any way hardware accelaration is related to this, if yes then how and if not then what can I use.
please help!!!
EDIT-- I want to do something so that screenshot comes out to be black..

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Okay the Title can be misleading.
But it´s like this.
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