can't call method on an undefined error in perl script

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

Hi I am getting error while running perl script "can't call method "findnodes" on an undefined value at c:\work\pm.line 17".My script as shown below.

#!/usr/bin/perl
use warnings;
use strict;
use XML::LibXML;
my @xml_files = File::Find::Rule->file->maxdepth(1)->name('*dtc.xml')-
+>in( "c:/file/save");
my $bigXML = XML::LibXML::Document->new( '1.0', 'UTF-8');
my $aggregated; for my $xml_file ( @xml_files ) {

my $doc = XML::LibXML->new->parse_file( $xml_file );

my ( $specNode ) = $doc->findnodes( '//Specification' );

if ( $aggregated ) {
    $aggregated = $specNode;
}
else {
    my @details = $specNode->findnodes( './Definition' );
    $aggregated->addChild( $_ ) foreach @details;
}
}
$bigXML->adoptNode( $aggregated ); 
$bigXML->toFile( 'aggregated_data.xml' );
[download]

I Modified above code like that and this time it gives diffrent error like "XML::LibXML::Document::adoptNode()--node is not a blessed SV reference at c:\work\pm.line 17 " help me with this error I didn't see this type of error befor.

Comment on can't call method on an undefined error in perl script Download Code

Replies are listed 'Best First'.
Re: can't call method on an undefined error in perl script by MidLifeXis (Monsignor) on Nov 21, 2011 at 13:26 UTC
`$specNode` is undefined - find out why. The call 6 lines above (`my ( $specNode ) = $doc->findnodes( './Specification' );`) is where it is assigned. --MidLifeXis	[reply] [d/l] [select]
A reply falls below the community's threshold of quality. You may see it by logging in.
Re: can't call method on an undefined error in perl script by Anonymous Monk on Nov 21, 2011 at 12:48 UTC
I have one more question Glob function giving only .xml files in current working directory, if I want to get from some other directory folder what can I do. Write the appropriate glob pattern, see glob / File::Glob File::Find::Rule is probably easier to use than learning about glob patterns `use File::Find::Rule; my @files = File::Find::Rule->file->maxdepth(1)->name('.xml')->in( @d +irs );` [download] Or better yet, Path::Class::Rule, its Path::Classy `use Path::Class::Rule; my @files = Path::Class::Rule->new->file->max_depth(1)->name('.xml') +->all( @dirs );` [download]	[reply] [d/l] [select]