Perl and listening TCP socket

you could also use
while($buff=<Client>)

if you don't want to specify string size.

but then I think you will need to know when a PROG_ID xxxxxx code ends like by the newline or somehting
since I can't see what data the client is putting in I can't tell u for sure.

Here's your IO::Socket code fixed up.  It assumes your client is sending CRLFs.  If it isn't, it'd block until the socket close.    

#!/usr/bin/perl -w
use IO::Socket;

# Open LOG file for debug
open (LOG,">>/tmp/log.txt");

#Open socket
$MySocket=new IO::Socket::INET->new(Reuse => 1,
                              Listen  => 5,
                              LocalPort => 3319,
                              Proto => 'tcp') or die "$!";

# Next we need to wait so long, that we receive a string "PROG_ID xxxxxxx" ,where xxxx is a some ASCII string. Time to wait is from few seconds to 6 hours

$MySocket->listen();
while ( $conn = $MySocket->accept() ) {
     while ($ID = <$conn>) {
          print LOG "From socket $ID\n";       # Are we getting any
          if ($ID =~ /^PROG_ID/)
          {
               print LOG "IF-LAUSEESSA: $ID\n";
               $ID =~ s/PROGRAM_START //;      #RIP off "PROG_ID and leave only ASCII string
               print LOG "ASCII ID is: $ID\n";
          }
     }
}

---------
If you're client isn't using CRLFs and you really want to read 512 bytes at a time, change this:

   while ($ID = <$conn>) {

To:

   while (read($conn, $ID, 512))  {

The read will block until it receives 512 bytes or until the socket is closed-- not sure what you're after.  Also this:  

    $ID =~ s/PROGRAM_START //;

doesn't really jive with your comment (or with your earlier check):

   #RIP off "PROG_ID and leave only ASCII string

Did you mean?

   $ID =~ s/PROG_ID\s.//;

Hi Gurus


Here is detailed information for the problem.

The string what I need to wait look like this:

"PROGRAM_START 1243564236\r\n"


So how do a wait for a string and 6 to 10 number which end \r\n ?


Thansk for your help

-js

Try:

#!/usr/bin/perl -w
use IO::Socket;

# Open LOG file for debug
open (LOG,">>/tmp/log.txt");

#Open socket
$MySocket=IO::Socket::INET->new(Reuse => 1,
                              Listen  => 5,
                              LocalPort => 3319,
                              Proto => 'tcp') or die "$!";

$MySocket->listen();
while ( $conn = $MySocket->accept() ) {
     while ($ID = <$conn>) {
          chomp;
          print LOG "From socket $ID\n";       # Are we getting any
          if ($ID =~ /PROGRAM_START\s+(\d{6,10)/)
          {
               print LOG "IF-LAUSEESSA: $ID\n";
               print LOG "ASCII ID is: $1\n";
          }
     }
}