L_DocWriterUpdateMetaFileResolution

#include "l_bitmap.h"

L_LTDOCWRT_API L_INT EXT_FUNCTION L_DocWriterUpdateMetaFileResolution (hEmfSrc, xResolution, yResolution, phEmfDest )

L_HENHMETAFILE hEmfSrc;

handle to the source EMF

L_UINT xResolution;

new X resolution

L_UINT yResolution;

new Y resolution

L_VOID * pDocOptions;

pointer to a Document Options structure

L_HENHMETAFILE * phEmfDest;

address of a variable to be updated

Changes the resolution of an existing Enhanced Metafile (EMF).

Parameter

Description

hEmfSrc

Handle to the Enhanced Metafile (EMF) to be updated.

xResolution

The new X Resolution value.  0 means do not change this resolution.

yResolution

The new Y Resolution value.  0 means do not change this resolution.

phEmfDest

Address of an Enhanced Metafile (EMF) handle that will be updated with the modified EMF.

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

A value of 0 for xResolution or yResolution means do not change this resolution value. This allows you to only change the horizontal or the vertical resolution of an Enhanced Metafile (EMF) handle without affecting the other resolution.

If either xResolution or yResolution is equal to -1, then the aspect ratio for the original EMF handle will be maintained and the positive value for either xResolution or yResolution will be used as the resolution (DPI) value for the modified EMF handle. Note that xResolution and yResolution cannot both be less than zero.

Required DLLs and Libraries

LtDocWrt_u.dll, LtDocWrt_x.dll
LtFil_u.dll, LtFil_x.dll
LfJb2_u.dll, LfJb2_x.dll
Lfcmp_u.dll, Lfcmp_x.dll
Lftif_u.dll, Lftif_x.dll
Lfraw_u.dll, Lfraw_x.dll
Lfbmp_u.dll, Lfbmp_x.dll
Lfpng_u.dll, Lfpng_x.dll
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.

See Also

Functions:

L_DocWriterInit

Topics:

Creating Document Formats

 

Raster Image Functions: Document Writers

Example

This example converts Lead document format (ltd) to MS Word document foramt (doc)

static void ShowMetaFileDimension(HENHMETAFILE hEmf) 
{ 
   // Get the metafile header 
   L_UINT uSize = GetEnhMetaFileHeader(hEmf, 0, NULL); 
   L_VOID* ptr = malloc(uSize); 
   ENHMETAHEADER* pHeader = reinterpret_cast<ENHMETAHEADER*>(ptr); 
 
   L_TCHAR szBuffer[_MAX_PATH]; 
   wsprintf(szBuffer, TEXT("Size: %d by %d pixels\n"), pHeader->rclBounds.right - pHeader->rclBounds.left, pHeader->rclBounds.bottom - pHeader->rclBounds.top); 
   MessageBox(NULL, szBuffer, TEXT("Meta Information"), MB_OK); 
 
   // The resolution is saved in 0.01 mm units, convert to dots/inch 
   L_INT xResolution = (L_INT)((L_DOUBLE)pHeader->szlDevice.cx * 25.4 / (L_DOUBLE)pHeader->szlMillimeters.cx + 0.5); 
   L_INT yResolution = (L_INT)((L_DOUBLE)pHeader->szlDevice.cy * 25.4 / (L_DOUBLE)pHeader->szlMillimeters.cy + 0.5); 
   wsprintf(szBuffer, TEXT("Resolution: %d by %d pixels/inch\n"), xResolution, yResolution); 
   MessageBox(NULL, szBuffer, TEXT("Meta Information"), MB_OK); 
 
   free(ptr); 
} 
 
 
L_INT L_DocWriterUpdateMetaFileResolutionExample(L_VOID) 
{ 
   // Load the original meta file 
   L_HENHMETAFILE hEmf = GetEnhMetaFile(MAKE_IMAGE_PATH(TEXT("Ocr1.emf"))); 
 
   // Show the dimension 
   L_TCHAR szBuffer[_MAX_PATH]; 
   wsprintf(szBuffer,TEXT("Original EMF dimension:\n")); 
   MessageBox(NULL, szBuffer, TEXT("Meta Information"), MB_OK); 
   ShowMetaFileDimension(hEmf); 
 
   // Change the resolution to be 200 by 200 dots/inch 
   L_HENHMETAFILE hEmfDest = NULL; 
   L_INT nRet = L_DocWriterUpdateMetaFileResolution(hEmf, 600, 600, &hEmfDest); 
 
   // No need for the original handle anymore 
   DeleteEnhMetaFile(hEmf); 
 
   if(nRet == SUCCESS) 
   { 
      wsprintf(szBuffer,TEXT("New EMF dimension:\n")); 
      MessageBox(NULL, szBuffer, TEXT("Meta Information"), MB_OK); 
      ShowMetaFileDimension(hEmfDest); 
      DeleteEnhMetaFile(hEmfDest); 
   } 
 
   return SUCCESS; 
} 

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