Re: simple requirement related to displaying jpegs

"David Ching" <>
Fri, 15 Feb 2008 14:56:25 GMT
"Joseph M. Newcomer" <> wrote in message

There is apparently no JPEG-from-resource conversion mechanism; I'd
probably investigate
the JPEG libraries in places like

GDI+ offers this, e.g. Image::FromStream(). Paul di Lascia's CPicture
class, based on GDI+ (available in MSDN magazine) does this:

BOOL CPicture::Load(IStream* pstm)
 m_pImage = Image::FromStream(pstm, m_bUseEmbeddedColorManagement);
 return m_pImage->GetLastStatus()==Ok;

BOOL CPicture::LoadFromMem(HGLOBAL hMem)
 IStream* pstm;
 BOOL bRet = Load(pstm); // load from stream
 m_hMem = hMem;
 return bRet;

// Load from resource. Looks for "IMAGE" type.
BOOL CPicture::Load(UINT nIDRes)
 if (nIDRes==0)
  return FALSE;

 // find resource in resource file
 HINSTANCE hInst = AfxGetResourceHandle();
 HRSRC hRsrc = ::FindResource(hInst,
  _T("IMAGE")); // type
 if (!hRsrc)
  return FALSE;

 // load resource into memory
 DWORD len = SizeofResource(hInst, hRsrc);
 BYTE* lpRsrc = (BYTE*)LoadResource(hInst, hRsrc);
 if (!lpRsrc)
  return FALSE;

 // create stream on global memory
 HGLOBAL hMem = GlobalAlloc(GMEM_FIXED, len);
 BYTE* buf = (BYTE*)GlobalLock(hMem);
 memcpy(buf, lpRsrc, len);
 return LoadFromMem(hMem);

-- David

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