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标题: CAA 选择对象后的类型转换问题 [打印本页]

作者: liuruixiao205 时间: 2006-3-21 13:10
标题: CAA 选择对象后的类型转换问题
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？

作者: liuruixiao205 时间: 2006-3-23 09:18
顶一下，别沉了。还急用

作者: daoshou 时间: 2006-3-23 19:08
叮叮咚咚叮叮咚咚叮叮咚咚

作者: acoka 时间: 2006-3-23 22:36
CATISpecObject和CATCylinder实际上是2码事吧

你得先求得CATISpecObject的CATBody,然后求其中的其中的3次元要素。然后其中哪个是CATCylinder

作者: liuruixiao205 时间: 2006-3-24 09:18
谢谢acoka兄！

作者: liuruixiao205 时间: 2006-3-24 10:50
如果是1次元要素可以用CATVertex->GetPoint()得到CATPoint,可我得到了CATVolume，可它里面没有成员函数，直接把它赋值给CATCylinder 又不行。应该怎么办呢？

作者: acoka 时间: 2006-3-27 16:40
看了一下帮助
好久没做这个了，不太确定，但你可以试试看

CATCylinder* VIVSample::GetCylinderFromSpec( const CATISpecOBject_var& ispSpec)
{
CATCylinder* pCylinder = NULL;

do {
if( !ispSpec) {
break;
}

// GetBody(you can create a method named GetBodyFromFeature)
CATBody_var spSolidCylinderBody = GetBodyFromFeature( ispSpec );
if( !spBody) {
break;
}

// Get all of the 2-dim cell
CATLISTP(CATCell) cellListFace;
spSolidCylinderBody->GetAllCells(cellListFace,2);

// Get cylinder wall face
for ( int iCnt = 1; iCnt<=cellListFace.Size(); iCnt++ ) {
CATFace* pFace = (CATFace*)cellListFace[iCnt];
if( !pFace){
continue;
}
CATSurface* pSurface = pFace->GetSurface();
if ( !pSurface) {
continue;
}
if ( !pSurface->IsATypeOf( CATCylinder)) {
continue;
}
pCylinder = (CATCylinder*)pSurface;
break;
}

} while ( false);

return pCylinder;
}

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