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LBitmapBase::ConvertFromEMF

Summary

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

Syntax

#include "ltwrappr.h"

virtual L_INT LBitmapBase::ConvertFromEMF(hEMF, uWidth, uHeight)

Parameters

HENHMETAFILE hEMF

Handle to the EMF 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 enhanced metafile can be loaded at the original dimension or scaled by using the uWidth and uHeight parameters.

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

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

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

If uWidth > 0 and uHeight > 0 - the enhanced 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 EMF, then converts
the EMF back to a bitmap

L_INT LBitmapBase__ConvertFromEMFExample(LBitmap *pLeadBitmap)  
{ 
   L_INT nRet; 
   LBitmap Bitmap;    /* Bitmap handle for the initial image */ 
   HENHMETAFILE   hEMF;  
 
   /* Load a bitmap, keeping its own bits per pixel */ 
   Bitmap.Load(MAKE_IMAGE_PATH(TEXT("ImageProcessingDemo\\Image3.cmp")), 0, ORDER_BGR, NULL, NULL);  
   /* Convert the initial bitmap to a EMF */ 
   hEMF = Bitmap.ConvertToEMF(); 
   /* Free the initial bitmap */ 
   nRet =Bitmap.Free(); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   /* Convert the EMF to create a new LEAD bitmap and preserve the size */ 
   nRet =pLeadBitmap->ConvertFromEMF(hEMF, 0, 0); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   /* Clean up */ 
   DeleteEnhMetaFile(hEMF);  
 
   return SUCCESS; 
}