custom C function problem

I'm creating some custom C functions to load dynamically from a dll 
(this is Postgres 8.3.1 on Windows XP SP2).  I have two that work fine, 
but any time I try to write one that uses a text*, postgres crashes. 
This is true even for the example functions like "copytext" given in the 
do***entation here:
http://developer.postgresql.org/pgdocs/postgres/xfunc-c.html

I'm compiling my DLL with MinGW.  I do CREATE FUNCTION as described in 
the do***entation, and then I do a "SELECT copytext(colname) FROM 
tablename" (colname is a text column), at which point Visual Studio's 
"Something in postgres.exe crashed.  Do you want to debug?" dialog pops 
up.  (Of course, I click no and postgres appears to restart itself.)

Again, I have two other functions (neither of which uses a text*), both 
of which I can successfully load into postgres (from the same dll file 
as the function that crashes) and use in queries without problems.

Does anyone have any idea why this is happening?

- Dan

-- 
Sent via pgsql-general mailing list (pgsql-general@[EMAIL PROTECTED]
)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-general