My code captures a window to the Clipboard as a bmp that I can paste into many other programs. This works fine if the window has only simple graphics, but for an OpenGL window, when I paste the bmp all I get is an empty frame when running Windows 10.
The problem did not show up under Windows XP and 7, so it looks like a W10 problem. Here is the code I use to do the capture:
CBitmap BitmapClip; // taken from Young, page 1105
CClientDC ClientDC (this);
Was the DWM disabled on the Windows 7 machine it worked on? This may be a DWM problem rather than a Windows 10 problem, and if so, it would also be expected to fail on 8 and 8.1 as they also no longer allow the DWM to be disabled.
I never touched DWM, so I can’t say. It worked on every W7 machine out there, though, and also on XP. What’s weird is that the same code can save ordinary graphics windows bitmaps just fine. But not from an OpenGL window. Is there any plausible reason for that?