从内存中加载png<摘自MFC源码>

BOOL CPngImage::LoadFromBuffer (LPBYTE lpBuffer, UINT uiSize)
{
	if (!afxGlobalData.bGDIPlusSupport)
	{
		return FALSE;
	}

	ASSERT(lpBuffer != NULL);

	HGLOBAL hRes = ::GlobalAlloc (GMEM_MOVEABLE, uiSize);
	if (hRes == NULL)
	{
		return FALSE;
	}

	IStream* pStream = NULL;
	LPVOID lpResBuffer = ::GlobalLock (hRes);
	ASSERT (lpResBuffer != NULL);

	memcpy (lpResBuffer, lpBuffer, uiSize);

	HRESULT hResult = ::CreateStreamOnHGlobal (hRes, TRUE, &pStream);

	if (hResult != S_OK)
	{
		return FALSE;
	}

	if (CMFCToolBarImages::m_bMultiThreaded)
	{
		CMFCToolBarImages::m_CriticalSection.Lock ();
	}

	if (m_pImage == NULL)
	{
		m_pImage = new CImage;
		ENSURE(m_pImage != NULL);
	}

	m_pImage->Load (pStream);
	pStream->Release ();

	BOOL bRes = Attach (m_pImage->Detach ());

	if (CMFCToolBarImages::m_bMultiThreaded)
	{
		CMFCToolBarImages::m_CriticalSection.Unlock ();
	}

	return bRes;
}