How to correctly screencapture a specific window on Aero/DWM?

It's an excellent question that I unfortuneatly don't know exact answer to. My first idea was to grab the whole desktop and cut interesting part out of it.

For reference: DumpImage pretty much uses the Gdi::Bitmap's Save method. It has been omitted because it has some app-specific code that isn't relevant to the example. Also an added bonus is that if you were wondering how to include the cursor in your screengrab then the code is also there.

Hope it helps. Also worth mentioning, contrary to the traditional approach, this will also include any overlaid windows you might have on top of the captured window. Also, if you use this code for full screen captures, be warned that it will not capture video game windows.

I'm actually wondering how to do that properly without having to resort to DirectX. This only affects Windows Vista/7 when running in Aero mode.

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