WinQueryUpdateRegion - Parameters

hwnd (HWND) - input

Handle of window whose update region is to be queried.

hrgn (HRGN) - input

Handle of the window's update region.

The window's update region, in window coordinates, is copied into hrgn.

lComplexity (LONG) - returns

Complexity of resulting region/error indicator.

RGN_NULL

Null region
RGN_RECT
Rectangular region
RGN_COMPLEX
Complex region
RGN_ERROR
Error.

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