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int sds_getpreviewbmp (const char *szFileName, void** pHBITMAP, unsigned long* pAllocatedBytes, short* blsBitmap);

Returns the preview image of a specified drawing.

This function returns the preview image of a specified drawing file.

The argument szFileName represents an existing drawing file, for which you want to obtain the preview image.

The pHBITMAP parameter is the retrieved image.

The pAllocatedBytes parameter indicates how much memory was allocated in *pHBITMAP. You should free the memory when finished.

The blsBitmap parameter indicates whether the preview image is a bitmap or Windows metafile. progeCAD stores preview images with its drawing files.


The code shows an example of how to use the generic data returned by this function.

short bIsBitmap;

void* hBitmap = NULL;

unsigned long pAllocatedBytes;


int ret = sds_getpreviewbmp(fname, &hBitmap, &pAllocatedBytes, &bIsBitmap);

if (ret && pAllocatedBytes)


 If (bIsBitmap)





 else // meta file.


  DWORD seekpos;<

  DWORD dwIsAldus = *((DWORD*)hBitmap);

  if (dwIsAldus != ALDUSKEY)


  seekpos = 0;







  BYTE *p = (BYTE *)hBitmap;

  METAHEADER* mfHeader = (METAHEADER*)( p + seekpos);

  DWORD dwSize = mfHeader->mtSize * 2;

  HENHMETAFILE m_emf = ::SetWinMetaFileBits(dwSize, (const BYTE*)mfHeader, NULL, NULL);




Programming Overview of SDS (Solutions Development System)

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