Home/ Questions/Q 1083967
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-16T22:30:09+00:00

Possible Duplicate: Why am I getting an “Out of memory” error with Perl's XML::Simple?

  • 0

Possible Duplicate:
Why am I getting an “Out of memory” error with Perl's XML::Simple?

I have a XML file like this:

            <message>
                <c1>
                    <rrcConnectionSetupComplete>
                        <rrc-TransactionIdentifier>2</rrc-TransactionIdentifier>
                        <criticalExtensions>
                            <c1>
                                <rrcConnectionSetupComplete-r8>
                                    <selectedPLMN-Identity> 1 </selectedPLMN-Identity>
                                    <dedicatedInfoNAS> 07410109014290112345671000028020000f0 </dedicatedInfoNAS>
                                </rrcConnectionSetupComplete-r8>
                            </c1>
                        </criticalExtensions>
                    </rrcConnectionSetupComplete>
                </c1>
            </message>

I am using Perl code like this to access the data in XML file (I should stick on to this format of accessing)

#!/usr/bin/perl

use strict;

use XML::Simple;

my $xml = new XML::Simple;

my $data = $xml->XMLin("uL-DCCH-Message.xml");

my $rrc_trans_identifier = $data->{'c1'}->{'rrcConnectionSetupComplete'}->{'rrc-TransactionIdentifier'};
print "rrc_trans_id :: $rrc_trans_identifier\n";

my $selected_plmn_id = $data->{c1}->{rrcConnectionSetupComplete}->{criticalExtensions}->{c1}->{'rrcConnectionSetupComplete-r8'}->{'selectedPLMN-Identity'};
print "plmn identity :: $selected_plmn_id\n";

my $rrc_dedicated_info_nas = $data->{c1}->{rrcConnectionSetupComplete}->{criticalExtensions}->{c1}->{'rrcConnectionSetupComplete-r8'}->{dedicatedInfoNAS};
print "dedicated info nas :: $rrc_dedicated_info_nas\n";

The output produced is,

rrc_trans_id :: 2
plmn identity ::  1
dedicated info nas ::  07410109014290112345671000028020000f0

Perl code using XML::Simple is working fine for smaller XML files (as shown in the above output).

But If XML file is large, then XML::Simple cannot handle and it is showing the error message Ran out of memory.

Are there any other XML Parsers I can use so that I can access the elements in XML file in the similar manner as shown above?

If there is any other parsers available, can any one give an example by following the same conventions I am following for XML::Simple.

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    There are two types of XML Parsers available:

    • simple ones that read the whole XML
      file into memory and generate an easy
      accessible data structure, this takes
      a rather big amount of memory so
      you’ll get into trouble with bigger
      files. Their advantage is that they
      are usually very easy to work with.

    • the SAX based parsers which process
      the XML element by element. To work
      with this parsers the developer
      (you!) has to register callbacks for
      every interesting element and work
      with the information from the
      callbacks. Everytime the SAX parser
      encounters a given element the
      associated callback is executed and
      you are able to only work with the
      interesting tags rather the whole
      file at once. This parsers keep the
      memory usage (potentially) very low
      but require substatially more work.

    • 0