problem using PostGIS and long shapes

Hi all,

I've got a problem with de dobc driver using Postgis. The geometry column
is returned as a text with the astext function.

With large shapes, corresponding to larger than 16 KB, the driver returns
an error (in french):

"Une opération OLE-DB en plusieurs étapes a généré des erreurs. Vérifiez
chaque valeur d'état OLE-DB disponible. Aucun travail n'a été effectué."

if i execute the query directly in Postgres 8.0, it works. So the source
of my problem is from the driver.

Does anyone have encountered this problem and solved it ?

Thanks.

--
Hugues