c++ win32: how to set back color of a window?

Question

I can set the back color when i am registering the class, e.g.:

wincl.hbrBackground = CreateSolidBrush(RGB(202, 238, 255));
RegisterClassEx(&wincl);
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Answer 1

All the windows controls send a message to their parent to get the brush to use to fill their background. Assuming you save a copy of the brush handle somewhere, you can do the following in your WindowProc, or DialogProc, to ensure everything draws with the correct background brush.

case WM_CTLCOLORSTATIC:
case WM_CTLCOLORBTN:
  HDC hdc;
  HWND hwndCtl;
  POINT pt;
  hdc = (HDC)wParam;
  hwndCtl = (HWND)lParam;
  pt.x = 0;
  pt.y = 0;
  MapWindowPoints(hwndCtl,_hwnd,&pt,1);
  x = -pt.x;
  y = -pt.y;
  SetBrushOrgEx(hdc,x,y,NULL);
  return (INT_PTR)_skinBrush;