> > Why do you think is a problem?
> >
> > I have plenty of UDFs which use CString for parameters. They work

fine

> > for me.
>
> Do you mean input parameters, passed via xsqlda structure ?
> Can you send some example command ?

DECLARE EXTERNAL FUNCTION F_LEFT
CSTRING(254),
INTEGER
RETURNS CSTRING(254)
ENTRY_POINT 'F_Left' MODULE_NAME 'aaUDFLib'

select
f_left( 'abcde', 2)
from rdb$Database;


Sean