Best Method for Minimizable Fullscreen Window

I'm coding a short game in C++ and Win32, and I want to be able to make it in fullscreen with a fixed size. I also want the user to be able to switch focus between the game window and other windows as much as he/she want开发者_开发百科s without any weird screen glitches.

So far I know of the ChangeDisplaySettings function and creating the window with the WS_POPUP style at initialization to make it fullscreen. To detect the user switching focus to other windows by way of alt+tab or otherwise, what messages should I be handling on the window's WndProc or should I be using another function? When loss of focus is detected should I only call ChangeDisplaySettings(NULL, 0); or are there other functions I should call as well? And what method should I use to handle focus back into the window?

Also can anyone give me some info on how to make it work smoothly for different screen sizes?

Thanks for any help.

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If you want an exclusive full screen window, use DirectX.

But I don't recommend it. Changing the display mode causes glitches, rearranges the users icons and so on. Whether done by you, or Direct X.

Rather create a normal window at your native res, and let the user maximize it if wanted.

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You could also use the GDI+ library of Windows XP (and newer) to use hardware-accelerated stretching (draw in 640x480, let GDI+ resize it to the native resolution). Then you don't need exclusive mode of DirectDraw nor ChangeDisplaySettings.

Also drawing into a 640x480 big background buffer and bit blitting it on the drawing surface via StretchBlt can be a performant solution.