CAA 选择对象后的类型转换问题

liuruixiao205

如图：我得到圆柱的对象，代码如下：
     _BodyAgent=new CATFeatureImportAgent("surface");
         _BodyAgent->SetOrderedElementType("CATIMfTriDimResult");
     _BodyAgent->AddOrderedElementType("CATBody");
     _BodyAgent->AddOrderedElementType("CATIPad");
         _BodyAgent->AddOrderedElementType("CATCylinder");  
     _BodyAgent->SetBehavior      ( CATDlgEngWithPrevaluation | CATDlgEngWithCSO     | CATDlgEngOneShot         );
     _BodyAgent->SetAgentBehavior ( MfPermanentBody | MfLastFeatureSupport | MfRelimitedFeaturization );
         AddCSOClient(_BodyAgent);


CATBoolean SimVolCmd::BodySelect(void *data)
{
  // TODO: Define the action associated with the transition
  // ------------------------------------------------------
        CATBaseUnknown_var spSelection = _BodyAgent->GetElementValue();
        if(NULL_var!=spSelection)
        {     
                spBody=spSelection;
                if(spBody!=NULL)
                   cout<<"spBody!=Null"<<endl;
                CATIAlias_var spName = NULL_var;
                CATISpecObject_var spBody->QueryInterface(IID_CATIAlias,
                                   (void**) &spName);
            CATUnicodeString name = spName->GetAlias();
            DlgBox->SetBodyName(name);
        }
    _BodyAgent->InitializeAcquisition();
    return TRUE;
}
我用得到的spBody->QueryInterface(IID_CATCylinder ,(void**)&spCysinder);可是得到的对象为空，请问是什么原因？

liuruixiao205

daoshou

acoka

liuruixiao205

liuruixiao205

acoka