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GetWindowRgn (Compact 2013)

3/28/2014

This function obtains a copy of the window region of a window. The window region of a window is set by calling the SetWindowRgn function. The window region determines the area within the window where the system permits drawing. The system does not display any portion of a window that lies outside of the window region.


int GetWindowRgn(
  HWND hWnd, 
  HRGN hRgn
);

hWnd

Handle to the window whose window region is to be obtained.

hRgn

Receives a handle to the window region.

The return value specifies the type of the region that the function obtains. The following table shows some of the possible return values.

Value

Description

NULLREGION

The region is empty.

SIMPLEREGION

The region is a single rectangle.

COMPLEXREGION

The region is more than one rectangle.

ERROR

An error occurred; the region is unaffected.

The coordinates of a window's window region are relative to the upper left corner of the window, not the client area of the window.

To set the window region of a window, call the SetWindowRgn function.

Header

winuser.h

Library

coredll.lib,
Winmgr.lib

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