libpq - description of columns

Hello,

I'm having troubles to get the description of columns,
using the APIs listed in the PostgreSQL doc.

Using '\d TABLENAME', psql gives me
character(15)
for a column, when libpq API PQfsize returns -1 for
the same column, whereas -1 should only indicate
fields with variable size (like TEXT i guess). Any
idea ?

I then looked at psql source code and it uses system
tables to get descriptions of tables. Fine, but in my
application, i have to get description of cursors,
that is description of something like
SELECT col1,col2,...,colN FROM
table1,table2,...,tableN WHERE ....
which are not known at compile time. Do i have to
parse it at runtime to dynamically build the select
command to request the system tables ?

Thanks for any hints.

Christian

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