以OpenSchema方式打开所有的表之后，怎样判断是否是"SYSTEM TABLE"？

Question

以OpenSchema方式打开所有的表之后，怎样判断是否是"SYSTEM TABLE"？

Answer 1

http://support.microsoft.com/kb/182831
里头的去除SYSTEM TABLE的相关代码我没有看懂：
       while (VARIANT_TRUE != Rs1->GetadoEOF())
             {
                // Traversing through the Fields collection to get the values.
                if(!csTemp.IsEmpty())
                  csTemp += " ; ";                varValue = Rs1->Fields->GetItem(_variant_t((long)2))->Value;
                if(varValue.vt == VT_BSTR)
                  csTemp += varValue.bstrVal;
                else
                if(varValue.vt == VT_UI4)
                  csTemp.Format("%s %l",csTemp,varValue.lVal);                Rs1->MoveNext();
             }
VT_BSTR是SYSTEM TABLE系统表吗

Answer 2

_ConnectionPtr m_pConnection;
_RecordsetPtr m_pRecordset;
m_pConnection.CreateInstance(__uuidof(Connection));
  try                 
 {    
  _bstr_t strConnect = "Provider=SQLOLEDB; Server="服务器名称";Database="数据库名称";uid="SA";pwd=""";
  m_pConnection->Open(strConnect,"","",adModeUnknown);
  }
  catch(_com_error e)
  {
   AfxMessageBox("数据库连接失败!");
   }
   _variant_t vFieldValue;
   CString strFieldValue;
   m_pRecordset=m_pConnection->OpenSchema(adSchemaTables);
while(VARIANT_FALSE==m_pRecordset->adoEOF)
{
strFieldValue=(char*)_bstr_t(m_pRecordset->GetCollect("TABLE_TYPE"));
          if(!strcmp(strFieldValue.GetBuffer(0),"TABLE")||!strcmp(strFieldValue.GetBuffer(0),"table"))
{
 strFieldValue.ReleaseBuffer();
 strFieldValue=(char*)_bstr_t(m_pRecordset->GetCollect("TABLE_NAME"));
          }strFieldValue得到的就是非系统表.