LBitmapRgn::GetRgnHandle

#include "ltwrappr.h"

virtual HRGN LBitmapRgn::GetRgnHandle()

Creates a Windows region that is a snapshot of the associated class object's bitmap region.

Returns

The Windows region handle used by the class object's bitmap region.

Comments

If you want to assign a region from one bitmap to another, you must use the LBitmapRgn::GetRgnHandle function to get region from the first bitmap; then use the LBitmapRgn::SetRgnHandle function to assign the region to the second bitmap.

You are responsible for deleting the Windows region to free memory when the region is no longer needed. To do so, use the Windows DeleteObject function. The following is a list of Windows functions that relate to Windows regions:

Function

Action

CombineRgn

creates a region by combining two regions.

CreateEllipticRgn

creates an elliptical region.

CreateEllipticRgnIndirect

creates and elliptical region.

CreatePolygonRgn

creates a polygonal region.

CreatePolyPolygonRgn

creates a region consisting of polygons.

CreateRectRgn

creates a rectangular region.

CreateRectRgnIndirect

creates a rectangular region using a RECT structure.

CreateRoundRectRgn

creates a rectangular region with round corners.

DeleteObject

deletes a Windows GDI object, such as a region.

EqualRgn

compares two regions for equality.

FillRgn

fills a region with the specified brush.

FrameRgn

draws a border around a region.

GetRgnBox

retrieves the bounding rectangle for a region.

InvertRgn

inverts the colors in a region.

OffsetRgn

moves a region by the specified offsets.

PaintRgn

fills a region with the brush in the device context.

PtInRegion

queries whether a point is in a region.

RectInRegion

queries whether a rectangle overlaps a region.

SetRectRgn

changes a region into a specified rectangle.

Required DLLs and Libraries

LTDIS

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64.

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