From: darren kirby <bulliver@...>
Date: 2006-06-03T05:41:44+09:00
Subject: Exceptions inside loops...

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Hello all, quite new to ruby here.

I am trying to figure out how to catch exceptions and I am not having luck.=
=20
Basically I have a script that loops over an array of ports and tries to=20
connect to see if there is a service running. If there is nothing running=20
then I get a "Connection refused" error (ECONNREFUSED). In this case I just=
=20
want to print a small message and move on to the next port, however, my=20
attempt at this just terminates the loop entirely. Here's some (simplified)=
=20
code:

begin telnetPorts.each do |port|
   puts "Port " + port.to_s + ":"
   t =3D TCPSocket.new(host,port)
   banner =3D t.gets
   t.close
end

rescue SystemCallError
   puts "Unable to connect to port: " + $!
end

As it stands, this does catch the exception just fine, but moves to the nex=
t=20
block of code immediately. I tried using 'next' but it is giving me an erro=
r:=20
"unexpected next". So how does one simply move on to the next port in this=
=20
case? Do I need to rewrite it as a function?

Thanks for consideration,
=2Dd

=2D-=20
darren kirby :: Part of the problem since 1976 :: http://badcomputer.org
"...the number of UNIX installations has grown to 10, with more expected..."
=2D Dennis Ritchie and Ken Thompson, June 1972

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