CAA中的函数问题

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各位高手：
      我用了这段程序想要得到一个pocket的spec(一个草图或者一个曲线)，经过测试，spSpecObj非空，可是后来的spCurve1和spCurve2都是空的，请问为什么？应该怎么做？spSpecObj是这个类型的：CATIPocket_var
  
          CATISpecObject_var spSpecObj=spPocket->GetProfile();   
          if(NULL_var!=spSpecObj)
          {
            CString msg="NULL_var!=spSpecObj";
            AfxMessageBox(msg);
            CATCurve_var spCurve1(spSpecObj);
            CATISketch_var spCurve2(spSpecObj);
            if(spCurve1!=NULL_var)
            {
                         cout<<endl<<"(spCurve1!=NULL_var)"<<endl;
            }
              
            else
            {
            cout<<endl<<"spCurve1==NULL_var"<<endl;
            }
  
            if(spCurve2!=NULL_var)
            {
              cout<<endl<<"(spCurve2!=NULL_var)"<<endl;
            }
            
            else
            {
              cout<<endl<<"spCurve2==NULL_var"<<endl;
            }

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