ATL Error 정보 얻기

hr=       pUI->SetControlObject((IDispatch**)&p_App->p_SimMulti);
if(p_Multisim)p_Multisim.Release();  
if(hr!=S_OK)                                                          
{                                                                        
    hr = pUI->QueryInterface(IID_ISupportErrorInfo,(LPVOID*)&iErrInfo);  
    if( iErrInfo->InterfaceSupportsErrorInfo(IID_IDeviceLinker) == S_OK) 
    {                                                                                          
        IErrorInfo* iErrInfo;                                           
        hr = GetErrorInfo(NULL,&iErrInfo);                          
        BSTR bstr = NULL;                                               

        iErrInfo->GetDescription(&bstr); 
        _bstr_t Bstr(bstr,false);                                       
        m_str=  bstr;                                                    
        s_Setting.Format("SetControlObject()\r\n%s", m_str);            
        MessageBox(s_Setting,m_fmt,MB_OK);                              
       }                                                                  
}