哪位看出来问题出在什么地方？

Question

COleDateTime tdate,ttime;
tdate.SetDate(2002,1,1);
ttime.SetTime(10,0,0);m_ptrTmpRecord->AddNew();
m_ptrTmpRecord->PutCollect("SurveyDate",(_variant_t)tdate);
m_ptrTmpRecord->PutCollect("SurveyTime",(_variant_t)ttime);
m_ptrTmpRecord->Update();
程序执行到
m_ptrTmpRecord->PutCollect("SurveyDate",(_variant_t)tdate);就出错啦！！！
Access Violation!

Answer 1

m_ptrTmpRecord->PutCollect("SurveyDate",(_variant_t)tdate);改为 m_ptrTmpRecord->PutCollect(L"SurveyDate",(_variant_t)tdate);要用BSTR