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LBitmapBase::ConvertFromWMF

Summary

Converts a Windows metafile (WMF) into a LEAD Technologies bitmap. When this function is completed, there are two copies of the drawing in memory: the WMF and the original LEAD vector. Freeing one will not affect the other.

Syntax

#include "ltwrappr.h"

virtual L_INT LBitmapBase::ConvertFromWMF(hWMF, uWidth, uHeight)

Parameters

HMETAFILE hWMF

Handle to the WMF to be converted.

L_UINT uWidth

Amount by which to scale the metafiles original width.

L_UINT uHeight

Amount by which to scale the metafiles original height.

Returns

Value	Meaning
SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

The metafile can be loaded at the original dimension or scaled by using the uWidth and uHeight parameters.

If uWidth == 0 and uHeight == 0 - the metafile is loaded at the size present in the file

If uWidth == 0 and uHeight > 0 - the metafile is stretched so that it has the height uHeight (preserving the aspect ratio)

If uWidth > 0 and uHeight == 0 - the metafile is stretched so that it has the width uWidth (preserving the aspect ratio)

If uWidth > 0 and uHeight > 0 - the metafile is stretched so that it has the width uWidth and height uHeight (the aspect ratio is ignored)

Required DLLs and Libraries

LTKRN
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.

Example

This example loads a bitmap, converts it to a WMF, then converts the WMF back to a bitmap

L_INT LBitmapBase__ConvertFromWMFExample(HWND hWnd, LBitmap* pLeadBitmap)  
{ 
   UNREFERENCED_PARAMETER(hWnd); 
 
   L_INT nRet; 
   LBitmap Bitmap;    /* Bitmap handle for the initial image */ 
   HMETAFILE   hWmf;  
 
   /* Load a bitmap, keeping its own bits per pixel */ 
   nRet =Bitmap.Load(MAKE_IMAGE_PATH(TEXT("ImageProcessingDemo\\Image3.cmp")), 0, ORDER_BGR, NULL, NULL); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   /* Convert the initial bitmap to a WMF */ 
   hWmf = Bitmap.ConvertToWMF( );  
 
   /* Free the initial bitmap */ 
   nRet =Bitmap.Free(); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   /* Convert the WMF to create a new LEAD bitmap and preserve the size */ 
   nRet =pLeadBitmap->ConvertFromWMF(hWmf, 0, 0); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   /* Clean up */ 
   DeleteMetaFile(hWmf);  
 
   return SUCCESS; 
}