source: npl/mediabox/lcdproc_edwin/src/clients/examples/x11amp.pl

#!/usr/local/bin/perl -w

#
# This is just a test!  It's simple, cheesy, and doesn't do much
# or even look very nice.
#
# However, it demonstrates one way to handle input from the server.
# (although it seems buggy..  oops!  :)
#

use IO::Socket;
use Fcntl;

# Connect to the server...
$remote = IO::Socket::INET->new(
                Proto     => "tcp",
                PeerAddr  => "localhost",
                PeerPort  => "13666",
        )
        || die "Cannot connect to LCDproc port\n";

# Make sure our messages get there right away
$remote->autoflush(1);

sleep 1;        # Give server plenty of time to notice us...

print $remote "hello\n";
my $lcdconnect = <$remote>;
#print $lcdconnect;


# Turn off blocking mode...
fcntl($remote, F_SETFL, O_NONBLOCK);


# Set up some screen widgets...
print $remote "client_set name {X11AMP test}\n";
print $remote "screen_add x11amp\n";
print $remote "screen_set x11amp name {X11AMP test}\n";
print $remote "widget_add x11amp title title\n";
print $remote "widget_set x11amp title {X11AMP test}\n";
print $remote "widget_add x11amp one string\n";
print $remote "widget_set x11amp one 1 2 {  <-: E ; F :->}\n";


while(1)
{
        # Handle input...
        while(defined($line = <$remote>)) {
            @items = split(" ", $line);
            $command = shift @items;
            # Use input to change songs...
            if($command eq "key")
            {
                $key = shift @items;
                if($key eq "E")
                {
                    system("x11amp --rew");
                }
                if($key eq "F")
                {
                    system("x11amp --fwd");
                }
            }
            # And ignore everything else
            elsif($command eq "connect")
            {
            }
            elsif($command eq "listen")
            {
            }
            elsif($command eq "ignore")
            {
            }
            else {
                if($line =~ /\S/) {print "Huh?  $line\n";}
            }
        }

        sleep 1;

}

close ($remote)            || die "close: $!";
exit;