C / C++ / MFC

// allocate a global memory block and copy the image data to it
// dwFileSize is size of image buffer in memory (or file size if reading directly)
HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, dwFileSize);
PVOID pvData = GlobalLock(hGlobal);
CopyMemory(pvData, pImageData, dwFileSize);  // pImageData is source memory buffer
GlobalUnlock(hGlobal);

IStream* pStream;
// create IStream* from global memory which will
// be freed automatically when the stream is released
HRESULT hResult = CreateStreamOnHGlobal(hGlobal, TRUE, &pStream);
Image* pImage = Image::FromStream(pStream);
pStream->Release();

RectF destRect; // set values to destination location and size
Graphics graphics(hDC);
graphics.DrawImage(pImage, destRect);
delete pImage;