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Painting on a DC That Spans Multiple Displays

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To respond to a WM_PAINT message, use code like the following.

case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
EnumDisplayMonitors(hdc, NULL, MyPaintEnumProc, 0);
EndPaint(hwnd, &ps);

To paint the top half of a window, use code like the following.

GetClient Rect(hwnd, &rc);
rc.bottom = (rc.bottom - rc.top) / 2;
hdc = GetDC(hwnd);
EnumDisplayMonitors(hdc, &rc, MyPaintEnumProc, 0);
ReleaseDC(hwnd, hdc);

To paint the entire virtual screen optimally for each monitor, use code like the following.

hdc = GetDC(NULL);
EnumDisplayMonitors(hdc, NULL, MyPaintScreenEnumProc, 0);
ReleaseDC(NULL, hdc);