Back to General and Gameplay Programming

Win32 - capturing screenshots and odd resolutions

SymLinked · 2012-06-26T21:38:57

Hi! I've implemented a simple screenshot capture method, where I do the following: Get the screen DC by calling GetDC (NULL); Use CreateCompatibleDC () to create a device context. Grab width/height of the screen by calling GetDeviceCaps (). Calling CreateCompatibleBitmap (screenDC, width, height); Calling SelectObject (deviceContext, bitmap); Finally, calling BitBlt (deviceContext, 0, 0, x, y, screenDC, 0, 0, SRCCOPY | CAPTUREBLT); and GetDIBits () to get the data pointer. This works fine except that it doesn't work in odd resolutions like 1366x768 where everything shows up as white/black lines. Anyone got any ideas what's causing this? Is the data output from GetDIBits() padded in this case or something? It looks like there's an extra byte per channel or something which distorts the image as I'm assuming 32-bit, but that's hardly the case as the image is 32-bit. Any advice is greatly appreciated!

General and Gameplay Programming Programming

Started by SymLinked June 25, 2012 07:34 PM

9 comments, last by SymLinked 11 years, 10 months ago

SymLinked

1,233

Author

June 26, 2012 09:38 PM

Thanks Baterius, I was about to do that but figured it out now.

The above mentioned resources are correct and I'll edit my response. The error was my fault and was caused by me assuming FreeImage would just accept my buffer as is, without calling SetPixelColor() on each individual pixel. The latter works which I guess means I have to read up on how FreeImage stores its bitmaps instead.

Sorry for the misinformation on my side. Everything claimed so far was correct, I was just looking in the wrong spot.

Win32 - capturing screenshots and odd resolutions

This topic is closed to new replies.

Popular Topics

Recommended Tutorials

Win32 - capturing screenshots and odd resolutions

This topic is closed to new replies.

Popular Topics

Recommended Tutorials

Reticulating splines