Hi, I try to get the informations contained in an xml file.

The xml file : 
<?xml version='1.0'?>
<Targets>
    <main_target>
        <main_target_name>Instance</main_target_name>
        <target>
        <target_name>estspc_netlist</target_name>
        <target_options>CELLS</target_options>
        </target>
        <target>
        <target_name>ibitmap</target_name>
        <target_options>CELLS</target_options>
        <target_options>STACK_MODE</target_options>
        </target>
        <target>
        <target_name>liberty</target_name>
        <target_options>STACK_MODE</target_options>
        <target_options>VT_MODE</target_options>
        <sub_target>
            <sub_target_name>nldm_liberty</sub_target_name>
        </sub_target>
        <sub_target>
            <sub_target_name>ccs_liberty</sub_target_name>
            <sub_target_options>CELLS</sub_target_options>
            <sub_target_options>VT_MODE</sub_target_options>
        </sub_target>
        </target>
    </main_target>
    <main_target>
        <main_target_name>Validation</main_target_name>
        <target>
        <target_name>bmval</target_name>
        <target_options>VT_MODE</target_options>
        <sub_target>
            <sub_target_name>bmval_lvs</sub_target_name>
            <sub_target_options>VT_MODE</sub_target_options>
        </sub_target>
        <sub_target>
            <sub_target_name>bmval_sim</sub_target_name>
        <sub_target_options>STACK_MODE</sub_target_options>
        <sub_target_options>VT_MODE</sub_target_options>
        </sub_target>
        </target>
    </main_target>
</Targets>

[download]
My code : 
#!/usr/bin/env perl

# use module
use XML::Simple;
use Data::Dumper;

# create object
$xml = new XML::Simple;

# read XML file
$xmlData = $xml->XMLin("./xuo.xml", forcearray => 1);

# print output
# print Dumper($data);

my $main_target = '' ;
my $target = '' ;
my $sub_target = '' ;
my $main_target_name = '' ;
my $target_name = '' ;

foreach $main_target (@{$xmlData->{main_target}})
{
    $main_target_name = @{$main_target->{main_target_name}}[0] ;
    print "Main Target Name : ", $main_target_name, "\n" ;
    foreach $target (@{$main_target->{target}})
    {
    $target_name = @{$target->{target_name}}[0] ;
        print "    Target Name : ", $target_name, "\n";
#     if (exists $main_target->{target}->{sub_target})
#         {
            foreach $sub_target (@{$main_target->{target}->{sub_target
+}})
        {
        print "    Sub Target Name : ", $sub_target, "\n";
            }
#         }
    }
}

exit ;

[download]
If I comment out the lines foreach $sub_target...
then I get something correct :

Main Target Name : Instance
Target Name : estspc_netlist
Target Name : ibitmap
Target Name : liberty
Main Target Name : Validation
Target Name : bmval

But the "sub_target" is not always defined in the "target" fields of the xml file. This is the reason why it fails. But I don't know how to test the existence of this "sub_target" field to print only when this field do exist.

Do you know how to do ?

Regards.

Xuo.

In reply to I get "not a HASH reference" when parsing an XML file by xuo

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.