C / C++ / MFC

// Define 
std::list<SMyFrameData*>    m_FrameList;
CCriticalSection	m_FrameListLock;
... 

        //Pop the frame data from the font of list.
	CTempLock tempLock(&m_FrameListLock);
	if (m_FrameList.size() == 0) return 0L;

	pFrameData = m_FrameList.front();
	m_FrameList.pop_front();
        ... Decoder the frame data

        // use following code to push the frame data to the list.
        SMyFrameData* pNewFrame = new SMyFrameData();
pNewFrame->lpData = pBuf;
pNewFrame->iSize =   iSize;

CTempLock (&(pProcess->m_FrameListLock));
pProcess->m_FrameList.push_back(pNewFrame);
SetEvent(pProcess->m_hFrameProcessEvent);

IDispatch* pDisp = NULL;
IPDDomNode* pDocNode = NULL;
AccessibleObjectFromWindow(hPDF, OBJID_NATIVEOM, IID_IDispatch, (void**)&pDisp ); 

hr = pDisp->QueryInterface(IID_IPDDomNode, (void**)&pDocNode);