ADO with C++? No way

ADO with C++? No way

Post by Arpad Tamas » Sat, 27 Jun 1998 04:00:00

I would like to open an ADO recordset in C++. The second parameter of
_RecordsetPtr.Open is _variant_t&. How can I convert a _ConnectionPtr to

Thanks for your help,
Arpad Tamasi


Code that doesn't work:
_ConnectionPtr Conn; ...
pRs->Open( "SELECT * FROM Customers", Conn, adOpenDynamic,
adLockReadOnly, adCmdText );

Error message:
error: class _com_ptr_t<class _com_IIID<struct _Connection,struct
__s_GUID const  _GUID_00000515_0000_0010_8000_00aa006d2ea4>>' to 'const
class _variant_t &'


ADO with C++? No way

Post by Matt Anderso » Sat, 27 Jun 1998 04:00:00

This is the way that I opwn my recordsets....

BOOL clDatabaseInterface::OpenRecordset(ADORecordset *pIRecordset,
                                        CString sSQL,
                                        CursorTypeEnum iType,
                                        CommandTypeEnum iCommandType)
  VARIANT varNull;
  COleVariant cvarSource(sSQL);

  if (pIRecordset != NULL)

  varNull.vt = VT_ERROR;
  varNull.scode = DISP_E_PARAMNOTFOUND;
  hr = pIRecordset->Open(cvarSource.Detach(), varNull, iType,
adLockOptimistic, iCommandType);
  if (!SUCCEEDED(hr))
    SetADOError(m_pIConnection, hr);
    DatabaseStatus = unable_to_open_recordset;                // failed to
in open
    return FALSE;

  return (TRUE);


Matt Anderson


1. C++, C++, C++, C++

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