是这样捕捉ado异常吗？

Question

要不然，你试试下面的代码：        try
        {
                hr = pConn.CreateInstance(__uuidof(Connection));
                if (FAILED(hr))
                        _com_raise_error(hr);
                pConn->ConnectionString=_bstr_t(CS_ConnStr);
                pConn->Mode=adModeReadWrite;
                if (pConn->State != adStateOpen )
                {
                        hr = pConn->Open(L"",L"",L"",-1);
                        if (FAILED(hr))
                                _com_raise_error(hr);
                }
        }
        catch(_com_error &e)
        {
                throw e;
                return FALSE;
        }
        return TRUE;

Answer 1

这是ADO的BUGADO析构的时候，会清空错误消息.....
这样写。。加个{{
_RecordsetPtr adoRs=NULL;
try
{
    adoRs.CreateInstance(__uuidof(Recordset));
    adoRs->PutCursorLocation(adUseClient);
    adoRs->Open("select * from student",
        "Provider=Microsoft.Jet.OLEDB.4.0;Password='';
        DataSource=d:\\sample.mdb;Persist Security Info=True", 
    adOpenStatic,adLockBatchOptimistic,adCmdText);
    adoRs->AddRef ();
    return S_OK;
}
catch(_com_error e)
{
  *x=e.Description();
}}///--------这里ADO 已释放  return AtlReportError(CLSID_a,(LPCOLESTR)e.Description (),
  IID_Ia,e.Error ());