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What is the best (easiest) way to take a screenshot of an running application with C++ under Windows?
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Press the Windows key + PrintScreen on your keyboard (or, PrtSc). Screenshots are automatically saved to Pictures/Screenshots in your user directory (C:/Users/%username%/Pictures/Screenshots by default).
Screenshots showing only one screen:Hit CTRL + ALT + PrtScn on your keyboard. Hit CTRL + V to paste the screenshot in Word, Paint, an email, or whatever else you can paste it into.
Save full screen screenshot: Windows Key + PrtScn (or Windows Key + Volume Down on a tablet) Copy screenshot of single window: Alt + PrtScn.
You have to get the device context of the window (GetWindowDC()) and copy image (BitBlt()) from it. Depending on what else you know about the application you will use different methods to find which window's handle to pass into GetWindowDC().
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