请教交互式工程图元的拷贝问题

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想把工程图中一个SHEET的内容拷到另一个SHEET里，现通过spcurrenView=spcurrentSheet－>GetCurrentView();
然后把spcurrentView拷贝到spNewSheet.实现过程如下.

此程序可实现自己画的工程图的拷贝及图框的拷贝。但对于由CATIA的3维图直接生成的2维工程图却不能拷贝，编译可通过，但运行出错“检测到空指针”，请教各位高手，如何入手解决呢？
问题可能是处在，交互产生的工程图，和PART文档之间的连接问题。对否？

请各位指点，多谢了！：）


   ListOfVarBaseUnknown newListToCopy;
    ListOfVarBaseUnknown listFromCopy;

    CATIView_var spView=spSheet1->GetCurrentView();
   CATISpecObject_var spViewToPaste(spView);   
  listFromCopy.Append(spViewToPaste);

   result = piCutAndPastableOnSourceCont -> BoundaryExtract (newListToCopy,      &listFromCopy,NULL);
         if (NULL != result)
           {
                    cout<<"........."<<endl;
            }
                       
    else
    {
        cout << "BoundaryExtract failed" << endl << flush;
        piCutAndPastableOnSourceCont -> Release();
                piCutAndPastableOnTargetCont -> Release();
        return 10;
    }

  VarBaseUnknown pExtractedList;
  pExtractedList = piCutAndPastableOnSourceCont -> Extract (newListToCopy, NULL);
  piCutAndPastableOnSourceCont -> Release();
  piCutAndPastableOnSourceCont = NULL;
  CATICutAndPastable *piCutAndPastableOnExtractedList = NULL;
    rc = pExtractedList -> QueryInterface(IID_CATICutAndPastable,
                                                  (void**) &piCutAndPastableOnExtractedList);
    if (FAILED(rc))
        {
        cout << "ERROR in QueryInterface on CATICutAndPastable on Target Container" << endl ;      
                       return 3;
        }
    if(piCutAndPastableOnExtractedList)cout<<"piCutAndPastableOnExtractedList!=0"<<endl;
    ListOfVarBaseUnknown extractedListToCopy;

    result = NULL;
    result = piCutAndPastableOnExtractedList -> BoundaryExtract (extractedListToCopy,
                                                                 NULL,
                                                                 NULL);
        if (NULL != result)
        {
                cout << "BoundaryExtract from Clipboard succeeded" << endl << flush;
                cout << "Number of objects extractedListToCopy= " << extractedListToCopy.Size() << endl;
        }
    else
    {
        cout << "BoundaryExtract failed" << endl << flush;
       piCutAndPastableOnTargetCont -> Release();
        return 10;
    }

        piCutAndPastableOnExtractedList -> Release();
        piCutAndPastableOnExtractedList = NULL;

        if(piCutAndPastableOnTargetCont!=NULL)cout<<"piCutAndPastableOnTargetCont!=0"<<endl;
        else cout<<"piCutAndPastableOnTargetCont==0"<<endl;

        cout << "Number of objects extractedListToCopy= " << extractedListToCopy.Size() << endl;
    ListOfVarBaseUnknown listPastedObjects ;
        listPastedObjects= piCutAndPastableOnTargetCont -> Paste (extractedListToCopy,NULL,NULL)

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