PQgetvalue weirdness

I'm executing a (simple) query using libpq, and this is the error I get
from PQgetvalue(result, 1, 1):

PQgetvalue: There is no field 1 in the query results.  The highest
numbered field is 0.

I get a similar error if I call getlength().

There _is_ data there - PQprintTuples() prints everything correctly.


Can anyone shed any light?  PQtrace() doesn't reveal anything useful..


Simon.


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