Re: CImage read and write to memory files

Pavel Pokutnev <>
Tue, 18 Aug 2009 04:01:21 -0700 (PDT)
On 18 Aug., 11:35, phil oakleaf <> wrote:

I am using the GDI+ Image class - but can change that to the MFC CImage
if need be.

At the moment I only seem to be able to save and load these to external

Is there a way that I hold these images in a single block of memory
instead. That way I can store the memory in my own filing system.

Hope someone can help with this

many thanks

Here a sample for loading an image from resource, that might be

BOOL LoadFromResource(HINSTANCE hInstance, LPCTSTR szResourceName,
LPCTSTR szResourceType, CImage& img)
  HRSRC hResource = ::FindResource(hInstance, szResourceName,
  if (!hResource)
    return FALSE;

  DWORD imageSize = ::SizeofResource(hInstance, hResource);
  if (!imageSize)
    return FALSE;

  const void* pResourceData = ::LockResource(::LoadResource(hInstance,
  if (!pResourceData)
    return FALSE;

  HGLOBAL hBuffer = ::GlobalAlloc(GMEM_MOVEABLE, imageSize);
  if (hBuffer)
    HRESULT hr = E_FAIL;
    void* pBuffer = ::GlobalLock(hBuffer);
    if (pBuffer)
      ::CopyMemory(pBuffer, pResourceData, imageSize);

      IStream* pStream = NULL;
      if (::CreateStreamOnHGlobal(hBuffer, FALSE, &pStream) == S_OK)
        hr = img.Load(pStream);
    hBuffer = NULL;
    return (hr == S_OK);
  return FALSE;

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