Hello!

I want to know how to take a screenshot of a full-screen application (that's using DirectX or OpenGL) from my application. I have tried using Qt's built-in feature, but it only remotely works on Windows XP, where I get a black screen. On Windows 7 with Aero I get a little black box in the top left corner. I've looked around for a few days but I'm unable to find anything, except programs that can - but don't have their source-code...