从AcDbObjectPointer&lt；对象&gt；

template
class AcDbObjectPtr : public AcDbObjectPointer
{
public:
  explicit AcDbObjectPtr(T_OBJECT *pObj =0) throw();
private:
  AcDbObjectPtr(AcDbObjectPtr &pObject);
  AcDbObjectPtr& operator=(AcDbObjectPtr &pObject);
};
template inline
AcDbObjectPtr::AcDbObjectPtr(T_OBJECT *pObj)
{
  m_ptr = pObj;
  if (m_ptr == NULL)
    m_status =  Acad::eNullObjectPointer;
  else
    m_status = Acad::eOk;
}

AcDbObjectPtr pLine(new AcDbLine(AcGePoint3d(0,0,0), AcGePoint3d(100,100,0) ));
      if(pLine.openStatus() != Acad::eOk)
        // do something 

我为什么不这样做workingDatabase();
    if(!pDatabase)
      return Acad::eNoDatabase;
    AcDbBlockTableRecordPointer pCurrentSpace(pDatabase->currentSpaceId(),AcDb::kForWrite);
    if((es = pCurrentSpace.openStatus()) != eOk)
      return es;
    AcDbObjectPtr pLine(new AcDbLine(AcGePoint3d(0,0,0), AcGePoint3d(100,100,0) ));
    if(pLine.openStatus() != Acad::eOk)
      return Acad::eOutOfMemory;
    es = pCurrentSpace->appendAcDbEntity(pLine);
    return es;
  }
[/code]