CAA：怎么根据sketch得到MechanicalPart或 MechanicalTool ？

有请高手帮忙，CAA中怎么根据sketch得到它所属的MechanicalPart或 MechanicalTool ？能否给出代码。谢谢。

CATIMechanicalTool_var WSHTest::GetMechTool( CATISpecObject_var ispSpecObject )
{
  CATIMechanicalTool_var spMechToolFather = NULL_var;
  
  do {
    if ( !ispSpecObject ) {
      break;
    }
  
    CATISpecObject_var spIFather = ispSpecObject;
    
    for ( int iCnt = 1; iCnt<=100; iCnt++ ) {
      if ( !spIFather ) {
        break;
      }
      // Get feature's father
      spIFather  = spIFather->GetFather();
      
      // is the father is not CATIGSMTool
      spMechToolFather = spIFather;
      if ( !spMechToolFather ) {
         continue;
      }
    }    
  
  }  while ( FALSE );
  
  return spMechToolFather;
}

谢谢acoka 。