Issue with using XML::Simple

spawned345 has asked for the wisdom of the Perl Monks concerning the following question:

I'm getting the following error while trying to print the value in the following code for the below xml. I have similar scripts working w/o issue, but can't figure this one out. Any assistance would be appreciated.

XML:

<response_xml>
<exec_command>
<command>
show resource usage context brn0ace01
</command>
<status code="100" text="XML_CMD_SUCCESS"/>
<xml_show_result>
<xml_show_resource_usage>
<ru_entry>
<ru_resource>bandwidth           </ru_resource>
<ru_current>      2744</ru_current>
</ru_entry>
<ru_entry>
<ru_resource>conn           </ru_resource>
<ru_current>      500</ru_current>
</ru_entry>
</xml_show_resource_usage>
</xml_show_result>
</exec_command>
</response_xml>
[download]

Script:

use XML::Simple qw(:strict);

my $xml = XMLin($tmpfile, ForceArray => 0, SuppressEmpty => 1, KeyAttr
+ => 'ru_resource' );
my $bandwidth =  $xml->{exec_command}->{xml_show_result}->{xml_show_re
+source_usage}->{ru_entry}->{bandwidth}->{ru_current};
print $bandwidth;
[download]

I get "Use of uninitialized value in print" and don't know why.

The following is the output of Dumper:

$VAR1 = {
          'exec_command' => {
                            'xml_show_result' => {
                                                 'xml_show_resource_us
+age' => {
                                                                      
+        'ru_entry' => {
                                                                      
+                      'conn           ' => {
                                                                      
+                                           'ru_current' => '      500
+'
                                                                      
+                                         },
                                                                      
+                      'bandwidth           ' => {
                                                                      
+                                                'ru_current' => '    
+  2744'
                                                                      
+                                              }
                                                                      
+                    }
                                                                      
+      }
                                               },
                            'status' => {
                                        'text' => 'XML_CMD_SUCCESS',
                                        'code' => '100'
                                      },
                            'command' => '
show resource usage context brn0ace01
'
                          }
        };
[download]

Comment on Issue with using XML::Simple Select or Download Code

Replies are listed 'Best First'.
Re: Issue with using XML::Simple by toolic (Bishop) on Jul 07, 2011 at 17:01 UTC
As your Data::Dumper output shows, there is significant whitespace after "bandwidth". One way to get it to work (and eliminate the warning) is to change: `my $bandwidth = $xml->{exec_command}->{xml_show_result}->{xml_show_re +source_usage}->{ru_entry}->{bandwidth}->{ru_current};` [download] to: `my $bandwidth = $xml->{exec_command}->{xml_show_result}->{xml_show_re +source_usage}->{ru_entry}->{'bandwidth '}->{ru_current};` [download] Update: But a better way (after searching the POD for "space") is to use NormaliseSpace: `my $xml = XMLin($tmpfile, ForceArray => 0, SuppressEmpty => 1, KeyAttr + => 'ru_resource', NormaliseSpace => 1 );` [download]	[reply] [d/l] [select]
Re^2: Issue with using XML::Simple by spawned345 (Initiate) on Jul 07, 2011 at 17:21 UTC
Works as expected now. I appreciate the help!	[reply]