Question

Assuming I would like to program a magnifier, how could I capture the content of the screen excluding my very own window ?
I know how to capture the screen with my own window using BitBlt and the Desktop DC.

And to make it clearer: I want to show the magnified content in my window.

Edit: It seems that there is no other solution than to hide my window (or the client area) one way or another before I can capture the screen content under my window. Apparently this causes my window to flicker which renders this scenario pretty useless.

Answer 1

During the capture process set the forms AlphaBlend property to true and the AlphaBlendValue to 0. Be aware that this will make your form completely invisible.