V-Sync in MFC and GDI+

hi I'm using MFC SDI application for my mid term project. but every time i draw scene (with GDI) and "invalidate()" it flicking occur.

I use DWM for double buffering and removing flicking but it rarely occur. i think problem is in the vertical 开发者_如何学Csyncing.what can I do for enabling virtual syncing

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Try overriding OnEraseBkgnd and simply return TRUE and do nothing else. This will prevent the background being "erased" each time you draw. Returning TRUE says "I've erased it`, even if you've done no such thing.