C++ COleDataSource::CacheData方法代码示例

COleDataSource* CModuleWnd::PrepareDataSource()
{
	ASSERT(m_pCurrentDocument != NULL);
	
	int nSelectedObjects = GetListCtrl()->GetSelectedCount();
	if (nSelectedObjects < 1)
		return NULL;
	
	STGMEDIUM stgMedium;
	COleDataSource* pDataSource;
	
	pDataSource = new COleDataSource;
	if(pDataSource == NULL)
	{
		AfxThrowMemoryException();
	}
	
	if (!GetSelectModuleData(&stgMedium))
	{
		delete pDataSource;
		return NULL;
	}
	
	pDataSource->CacheData(CDevDoc::m_cfDocData, &stgMedium);
	
	GetDragInfoData(&stgMedium);
	pDataSource->CacheData(CLayoutView::m_cfDragInfo, &stgMedium);
	
	return pDataSource;
}

// helper function used for clipboard and drag-drop 
COleDataSource* CEx27bView::SaveObject()
{
	TRACE("Entering CEx27bView::SaveObject\n");
	CEx27bDoc* pDoc = GetDocument();
    if (pDoc->m_lpOleObj != NULL) {
		COleDataSource* pSource = new COleDataSource();
        
        // CODE FOR OBJECT DATA
        FORMATETC fmte;
        SETFORMATETC(fmte, m_cfEmbedded, DVASPECT_CONTENT, NULL,
            TYMED_ISTORAGE, -1);
        STGMEDIUM stgm;
        stgm.tymed = TYMED_ISTORAGE;
        stgm.pstg = pDoc->m_pTempStgSub;
        stgm.pUnkForRelease = NULL;
		pDoc->m_pTempStgSub->AddRef();   // must do both!
		pDoc->m_pTempStgRoot->AddRef();
		pSource->CacheData(m_cfEmbedded, &stgm, &fmte);

		// metafile needed too
		MakeMetafilePict(pSource);
		
		// CODE FOR OBJECT DESCRIPTION DATA
		HGLOBAL hObjDesc = ::GlobalAlloc(GMEM_SHARE, sizeof(OBJECTDESCRIPTOR));
		LPOBJECTDESCRIPTOR pObjDesc =
		    (LPOBJECTDESCRIPTOR) ::GlobalLock(hObjDesc);
		pObjDesc->cbSize = sizeof(OBJECTDESCRIPTOR);
		pObjDesc->clsid	= CLSID_NULL;
		pObjDesc->dwDrawAspect = 0;
		pObjDesc->dwStatus = 0;
		pObjDesc->dwFullUserTypeName = 0;
		pObjDesc->dwSrcOfCopy = 0;
	   	pObjDesc->sizel.cx = 0;
    	pObjDesc->sizel.cy = 0;
    	pObjDesc->pointl.x = 0;
    	pObjDesc->pointl.y = 0;
		::GlobalUnlock(hObjDesc);
		pSource->CacheGlobalData(m_cfObjDesc, hObjDesc);
		return pSource;
	}
	return NULL;
}

BOOL CBCGPMSOffice2007DemoView::InsertBitmap (UINT uiBmpResID)
{
	CWaitCursor wait;

	CBitmap bmp;
	if (!bmp.LoadBitmap(uiBmpResID))
	{
		return FALSE;
	}
	
	COleDataSource* pDataSrc = new COleDataSource;
	COleDataObject* pData = new COleDataObject;
	
	CBCGPMSOffice2007DemoCntrItem* pItem = NULL;
	
	TRY
	{
		WPD_CHARFORMAT cf = GetCharFormatSelection();

		STGMEDIUM stgm;
		stgm.hGlobal = bmp.GetSafeHandle();
		stgm.tymed = TYMED_GDI;
		stgm.pUnkForRelease = NULL;

		pDataSrc->CacheData (CF_BITMAP, &stgm);
		
		LPDATAOBJECT lpdata;

		if (FAILED (pDataSrc->m_xDataObject.QueryInterface (IID_IDataObject,
			(LPVOID FAR*) &lpdata)))
		{
			AfxThrowUserException();
		}
		
		pData->Attach (lpdata);
		
		CBCGPMSOffice2007DemoDoc* pDoc = GetDocument();
		ASSERT_VALID(pDoc);

		pItem = new CBCGPMSOffice2007DemoCntrItem (NULL, pDoc);
		ASSERT_VALID(pItem);

		if (!pItem->CreateStaticFromData (pData))
		{
			AfxThrowUserException();
		}
		
		pItem->m_uiCategoryID = uiBmpResID;
		InsertItem (pItem);

		pDoc->UpdateAllViews (this);

		SetCharFormat (cf);
		SyncFont ();
	}
	CATCH(CException, e)
	{
		if (pItem != NULL)
		{
			ASSERT_VALID(pItem);
			pItem->Delete ();
		}

		delete pData;
		delete pDataSrc;

		return FALSE;
	}
	END_CATCH

	delete pData;
	delete pDataSrc;

	CMainFrame* pMainFrame = ((CMainFrame*) GetTopLevelFrame ());
	ASSERT_VALID (pMainFrame);

	pMainFrame->ActivateRibbonContextCategory (uiBmpResID);

	return TRUE;
}