StackOverflow2013

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POHow to correctly screencapture a specific window on Aero/DWM
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copied!<p>Background info: I have this MFC application I coded and been using for a long time that pretty much automatically saves screenshots to the hard disk when the user hits the Print Screen/Alt+Print Screen key. I have been putting off using anything related to Aero until now that I've been using Windows 7 RC for a couple of weeks. </p> <p>The problem: I'm using the standard GetDC/BitBlt method to capture the window contents. I have no problems with this method while doing regular full-screen grabs (no matter how many windows are opened etc). The problem arises when I try capturing the foreground window (Alt+PrintScreen). Here are two examples:</p> <p>Example 1 <a href="http://indiecodelabs.com/extern/example1.jpg" rel="nofollow noreferrer">http://indiecodelabs.com/extern/example1.jpg</a></p> <p>Example 2 <a href="http://indiecodelabs.com/extern/example2.jpg" rel="nofollow noreferrer">http://indiecodelabs.com/extern/example2.jpg</a></p> <p>As you can see, I'm getting garbage where the borders should be. This is more noticeable towards the top, where we can see some duplication of the toolbar in both screenshots. </p> <p>I've been googling about this for hours now and all I can find are articles saying that under DWM the BitBtl/GetDC method won't work, but can't find a single one explaining what we (the developers) should do to be able to maintain the same functionality in our apps when running on DWM.</p> <p>Any help, pointers, suggestions will be greatly appreciated.</p>

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