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GetRegionData function

The GetRegionData function fills the specified buffer with data describing a region. This data includes the dimensions of the rectangles that make up the region.

Syntax


DWORD GetRegionData(
  _In_   HRGN hRgn,
  _In_   DWORD dwCount,
  _Out_  LPRGNDATA lpRgnData
);

Parameters

hRgn [in]

A handle to the region.

dwCount [in]

The size, in bytes, of the lpRgnData buffer.

lpRgnData [out]

A pointer to a RGNDATA structure that receives the information. The dimensions of the region are in logical units. If this parameter is NULL, the return value contains the number of bytes needed for the region data.

Return value

If the function succeeds and dwCount specifies an adequate number of bytes, the return value is always dwCount. If dwCount is too small or the function fails, the return value is 0. If lpRgnData is NULL, the return value is the required number of bytes.

If the function fails, the return value is zero.

Remarks

The GetRegionData function is used in conjunction with the ExtCreateRegion function.

Requirements

Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]

Header

Wingdi.h (include Windows.h)

Library

Gdi32.lib

DLL

Gdi32.dll

See also

Regions Overview
Region Functions
CreatePolygonRgn
CreatePolyPolygonRgn
CreateRectRgn
CreateRectRgnIndirect
CreateRoundRectRgn
ExtCreateRegion
RGNDATA

 

 

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