CAA 选择对象后的类型转换问题

liuruixiao205 · 发表于 2006-3-21 13:10:39

马上注册登录，享用更多网站功能！

您需要登录才可以下载或查看，没有帐号？立即注册

x

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？