我选择的平面，用于投影时为什么是空的

我想选择如下图所示的平面，以下是我的程序

CATBaseUnknown * pSelectPlane=_pSelectPlaneAgent->GetElementValue(_pSelectPlaneAgent->GetValue());
CATPlane * spPlane = NULL;
rc=pSelectPlane->QueryInterface(IID_CATPlane,(void **)& spPlane);
if (SUCCEEDED(rc))
{
  cout<<"通过选取对象查询CATPlane成功,选取对象是平面"<<endl;
  pSelectPlane->Release();
  pSelectPlane=NULL;
  CATPlane_var spPlaneTem = spPlane;
  CATIFeaturize_var spRPlaneSpec = spPlaneTem;
  CATISpecObject_var SpecPlane=NULL_var;
  SpecPlane=spRPlaneSpec->FeaturizeF(MfDuplicateFeature | MfPermanentBody | MfSelectingFeatureSupport | MfFunctionalFeaturization );
  if (NULL_var ！=SpecPlane)
  {
  cout<<"将选取的平面转化为特征数据成功!!!"<<endl;
   SelectPlaneObject=SpecPlane;  
}
}

选择的这个平面用于做投影平面时
CATIGSMProject_var _pGSMProject = NULL_var;
  _pGSMProject = pGSMProjection->CreateProject(_spSurfaceBoundary,SelectPlaneObject,pGSMDir,TRUE,CATGSMAllSolutions);
  if (NULL_var==_pGSMProject)
  {
   cout<<"通过CATIGSMFactory接口函数CreateProject创建投影曲线失败!!!"<<endl;
   return FALSE;
  }
运行后的结果这个平面仍然没有选中，请问是我上面选择的平面有问题吗？

你的平面在结构树上实际存在，就不需要通过拓扑转换~~
CATBaseUnknown * pSelectPlane=_pSelectPlaneAgent->GetElementValue();
CATISpecObject_var spSpecPlane = pSelectPlane;



就可以了~~Ni试试~~~