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LChange::ChangeFromEMF

Summary

Changes a Windows enhanced metafile (EMF) into a LEAD Technologies bitmap and, if successful, frees the enhanced metafile.

Syntax

#include "ltwrappr.h"

static L_INT LChange::ChangeFromEMF(pLBitmap, uStructSize, hEmf, uWidth, uHeight)

Parameters

LBitmapBase * pLBitmap

Pointer to the bitmap object to be updated with the changed file.

L_UINT uStructSize

Size in bytes, of the structure pointed to by pLBitmap. Use sizeof(BITMAPHANDLE).

HENHMETAFILE hEmf

Handle to the EMF to be changed.

L_UINT uWidth

Amount by which to scale the enhanced metafiles original width.

L_UINT uHeight

Amount by which to scale the enhanced metafiles original height.

Returns

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

Comments

If this function is successful, hEmf is freed.

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 LChange__ChangeFromEMFExample(LBitmap * pLeadBitmap) 
{ 
   L_INT nRet; 
   LBitmap Bitmap ;   /* Bitmap handle for the initial image */ 
   HENHMETAFILE   hEMF;  
 
   /* 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 EMF */ 
   hEMF = LChange::ChangeToEMF( &Bitmap );  
 
   /* Convert the EMF to create a new LEAD bitmap and preserve the size */ 
   nRet = LChange::ChangeFromEMF(pLeadBitmap, sizeof(BITMAPHANDLE), hEMF, 0, 0);  
   if(nRet != SUCCESS) 
      return nRet; 
 
   return SUCCESS; 
 
}