Waiting for the result when running expect script

[theaccelerator]

I'm running expect script from a C++ program using the popen function.
My expect script is using the command:
spawn telnet $ipaddress

Then it performs login and runs several commands.

My problem is that I don't get the results of the script. It seems like I'm getting the control right away and continue with my program before the script has performed the telnet, thus I get and empty result when running the script from my program.

How can I wait for the script to end, and receive the results to see if there was a success or some problem has occured.

[wje_lf]

Can you post a tiny, complete expect script which duplicates the problem?

Don't forget to alter your user name and password on the remote machine before posting the script.

[theaccelerator]

My mistake, it appears like I got the whole interaction as the result, and I thought that the interaction was after I returned.
The problem now is how to get only the messages which where send by send_user and not the whole output.

Here is a short and simple script, where I would expect to recieve to my C program only the OK.

spawn telnet [lindex $argv 0]
expect login:
send "admin\r"
expect Password:
send "\r"
expect >
send "enable\r"
expect #
send_user "OK"
exit

This is important since, my script is much more complex and I only want to get as a result if there was some error, or if there was a success.

[wje_lf]

It's been a while since I've used expect, but here's an example I'm copying straight out of the excellent O'Reilly book Exploring Expect. If there are any errors, they're not my errors; they instead belong to my stubby, clumsy fingers.

#!/usr/bin/expect --

log_user 0
regexp (.*)@(.*) $argv ignore user host
spawn telenet $host smtp
set timeout -1
expect -re "220.*\r\n"
send "vrfy $user\r"
expect "250" {puts "GOOD"} \
       "550" {puts "BAD"}

Image of sample usage of this script:

% vrfy jobs@next.com
GOOD
% vrfy jobs@apple.om
BAD
%

Hope this helps.