Re: connecting using libpq breaks printf

Hi,


> This is my first attempt at using libpq, and I'm running across a strange
> problem. Here is my bare-bones program:
>
> #include<stdio.h>
> #include "libpq-fe.h"
>
> int main(int argc, char **argv) {
>    PGconn *conn;
>    fprintf(stderr, "connecting\n");
>    conn = PQconnectdb("dbname=postgres");
>    PQfinish(conn);
>    return 0;
> }
>
> I expected this program to print "connecting", but in fact I get no output
> whatsoever. If I comment out the PQconnectdb and PQfinish lines, I see
> "connecting" as expected. What could be going on here?

Did you use *exactly* the same command line to compile both versions?
What is that command line(s)?


> A few notes:
>   - I'm running PostgreSQL 8.3.6 on Windows XP. I used the one-click installer
>     to install.
>   - I'm compiling the program with MinGW. I get no compiler warnings or errors.
>   - I can connect to the database just fine using both pgAdmin and the
>     command-line client. The database is running on localhost.
>   - I've tried adding code to see if PQstatus(conn) == CONNECTION_OK, but this
>     hasn't been useful. Since fprintf() isn't working, I can't display a message
>     showing the result of the comparison.
>   - I've tried various combinations of connection options in case there was an
>     issue with the hostname, database name, username, or password. I always get
>     the same result: no output.
>   - I've tried printing to stdout and to a file, but neither helped.
>
> Thanks for any help you can provide.
> Joey
>


--
Aurimas