winapi - How to edit pixels in a wndproc window c++? -


i have window in c++ made wndproc function. how edit pixels of screen in 

case wm_paint:     {         hdc hdc;         paintstruct ps;         hdc = beginpaint( hwnd, &ps );         // ?????         endpaint( hwnd, &ps );     }

when wm_paint message pixels gone, and/or calling beginpaint causes pixels erased. painting code needs paint whole window. if merely changing few pixels can use in-memory bitmap, change few pixels within (setpixel 1 way), bitblt screen repaint whole window.


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