CAA Agent

我对Agent的工作顺序不太清楚，特别是有两个state的时候，哪位高手能有或写点这方面的文章。我做了一个选两个点的命令，可一选第二个点就出错。请帮着看看错误在哪里。
  _daPathElement = new CATPathElementAgent("GetPoint");
  
    _daPathElement->AddElementType("CATPoint");
  
  _daPathElement->SetBehavior(CATDlgEngWithPSOHSO|  
    CATDlgEngWithPrevaluation);  
  
   //AddCSOClient(_daPathElement);//使得可以先选择被操作对象
  CATDialogState *stState1 = GetInitialState("stPointId1");
  
  CATDialogState *stState2 = AddDialogState("stPointId2");  
  
  stState1->AddDialogAgent(_daPathElement);
  _daPathElement->InitializeAcquisition();
  stState2->AddDialogAgent(_daPathElement);
    
      CATDialogTransition *Transition1 =AddTransition
    (
    stState1,
    stState2,
    IsOutputSetCondition(_daPathElement),
    Action((ActionMethod) & LinCmd::Action1)
    ) ;   
  
   CATDialogTransition *Transition2 =AddTransition
    (
    stState2,
    stState2,
    IsOutputSetCondition(_daPathElement),
    Action((ActionMethod) & LinCmd::Action2)
    ) ;

我编译没错，但在选第二个点时会弹出命令中断对话框。

可以描述一下出錯是怎麼個錯法嗎?
  
SDK.

CATBoolean LinCmd::Action1( void *data )
{
  CATPathElement * pPathModel = _daPathElement->GetValue();  
  CATBaseUnknown* unknown1;
  unknown1=_daPathElement->GetElementValue( );
  //CATIAlias
  pPoint1=(CATISpecObject*)unknown1;
  _daPathElement->InitializeAcquisition();
  return TRUE;
}
CATBoolean LinCmd::Action2( void *data )
{
   CATPathElement * pPathModel = _daPathElement->GetValue();
   CATBaseUnknown* unknown2;
   unknown2=_daPathElement->GetElementValue( );
  pPoint2=(CATISpecObject*)unknown2;
  _daPathElement->InitializeAcquisition();
  return TRUE;
   
}