HELP!!!

I'm stuck for strange reason!
This is my first attempt to use pg_lo concept in my apps:

...
 Oid oid;
 PGconn* dbcon = PQconnectdb(conninfo.c_str());
 oid = lo_creat(dbcon, INV_WRITE | INV_READ);
 int pgfd = lo_open(dbcon, oid, INV_WRITE | INV_READ);
...


lo_open ALWAYS returns -1 while oid is positive (I can even see oid
in pg_largeobject system table)!!!!

postmaster reports the following:
ERROR:  lo_lseek: invalid large obj descriptor (0)

I realy NEED a prompt advice!

Please find a couple of minutes for reply!
TIA
Stanislav

ps> I run FreeBSD-4.4 + ported PostgreSQL-7.1.3
pps> my other pg-connected apps run OK


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