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LBitmapBase::ConvertFromEMF

#include "ltwrappr.h"

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

HENHMETAFILE hEMF;	handle to the WMF to be converted
L_UINT uWidth;	width
L_UINT uHeight;	height

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.

Parameter	Description
hEMF	Handle to the EMF to be converted.
uWidth	Amount by which to scale the metafiles original width.
uHeight	Amount by which to scale the metafiles original height.

Returns

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; 
}

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Help Version 20.0.2020.4.5

LEADTOOLS Raster Imaging C++ Class Library Help

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Classes and Member Functions

Summary of Features

Functions:	Class Members, LChange::ChangeFromEMF, LChange::ChangeFromWMF, LChange::ChangeToEMF, LChange::ChangeToWMF, LBitmapBase::ConvertFromWMF, LBitmapBase::ConvertToWMF, LBitmapBase::ConvertToEMF
Topics:	Raster Image Functions: Creating and Deleting Images