#include "ltwrappr.h"

L_INT LBitmapWindow::UpdateMagGlassShape(uMagGlassShape, hMagGlassRgn)

L_UINT uMagGlassShape;

flags that indicate the magnifying glass shape

L_HRGN hMagGlassRgn;

handle to the Windows region

Updates the Magnifying Glass shape.

Parameter Description
uMagGlassShape Flags that indicate the magnifying glass shape. Possible values are:
  Value Meaning
  MAGGLASS_SHAPE_RECT [0] Rectangle shape of Magnifying Glass.
  MAGGLASS_SHAPE_ELLIPSE [1] Ellipse shape of Magnifying Glass.
  MAGGLASS_SHAPE_HRGN [2] User-defined shape of Magnifying Glass.
hMagGlassRgn Handle to a Windows region that defines the Magnifying Glass shape. This parameter is used only if the uMagGlassShape parameter is MAGGLASS_SHAPE_HRGN.



The function was successful.

< 1

An error occurred. Refer to Return Codes.


The width and height of the Magnifying Glass will be changed according to the width and height of the passed hMagGlassRgn parameter if the uMagGlassShape parameter was set to MAGGLASS_SHAPE_HRGN.

The Magnifying Glass will stop and this function will return an error value in two cases:


If the value passed in the uMagGlassShape parameter was outside the defined values.


If the value passed in the uMagGlassShape parameter was MAGGLASS_SHAPE_HRGN and the value passed to the hMagGlassRgn parameter was NULL.

Required DLLs and Libraries

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


Win32, x64.

See Also


LBitmapWindow::GetMagGlassOptions, LBitmapWindow::MagGlassCallBack, Class Members


Using the Magnifying Glass


Raster Image Functions: Displaying Images


L_INT LBitmapWindow__UpdateMagGlassShapeExample(LBitmapWindow &LeadBWnd,HWND hWnd) 
   L_INT nRet; 
   HRGN  hRoundRectRgn; 
   hRoundRectRgn = CreateRoundRectRgn(0, 0, 100, 100, 25, 25); 
   nRet = LeadBWnd.SetWndHandle(hWnd); 
   if(nRet != SUCCESS) 
      return nRet; 
   if(nRet != SUCCESS) 
      return nRet; 
   nRet = LeadBWnd.UpdateMagGlassShape(MAGGLASS_SHAPE_HRGN, hRoundRectRgn); 
   if(nRet != SUCCESS) 
      return nRet; 
   return SUCCESS; 

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