CImage read and write to memory files

[phil oakleaf]

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
files.

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
Phil

[Goran]

On Aug 18, 11:35 am, phil oakleaf <n...@oakleafsoftware.co.uk> wrote:
> 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.

That's what

HRESULT Save(IStream* pStream, REFGUID guidFileType);

is for.

You have to create an object implementing implement IStream interface,
but that would be the easy part.

HTH,
Goran.

[Pavel Pokutnev]

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

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

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

const void* pResourceData = ::LockResource(::LoadResource(hInstance,
hResource));
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);
pStream->Release();
}
::GlobalUnlock(hBuffer);
}
::GlobalFree(hBuffer);
hBuffer = NULL;
return (hr == S_OK);
}
return FALSE;
}