WinQueryVisibleRegion - Parameters

hwnd (HWND) - input

The window handle.

hrgn (HRGN) - input

Region handle to receive the current visible region.

ulretn (ULONG) - returns

RGN_ERROR

An error occurred.
RGN_NULL
The window currently has no visible area on screen.
RGN_RECT
The region contains a series of rectangular areas.
RGN_COMPLEX
The region contains a complex shape.

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