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POHow do I store a hash which is inside an array element?
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  1. POHow do I store a hash which is inside an array element?
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    copied!<h2>The background</h2> <p>I got a Perl module which utilizes an array for its input/output parameters, like this:</p> <pre><code>Execute({inputfile =&gt; $req-&gt;{modules}.'filename', param =&gt; \@xchange}); </code></pre> <p>Inside the module a hash is build and returned via reference</p> <pre><code>$param[0] = \%values; </code></pre> <p>This is all fine and good (I think) and <code>print Dumper @xchange[0];</code> will output my desired content as</p> <pre><code>$VAR1 = { '33' =&gt; 'Title1', '53' =&gt; 'Title2', '21' =&gt; 'Title3' }; </code></pre> <p><br></p> <h2>The goal</h2> <p>I would like to loop over the content and print the key/value pairs one by one, for example like this</p> <pre><code>%testhash = ('33' =&gt; 'Test1', '53' =&gt; 'Test2', '21' =&gt; 'Test3' ); foreach $key (keys %testhash) { print "LOOP: $key, value=$testhash{$key}\n"; } </code></pre> <p>This loop does work as intended and dumping my testhash via <code>print Dumper \%testhash;</code> outputs the same as the array element above</p> <pre><code>$VAR1 = { '33' =&gt; 'Test1', '53' =&gt; 'Test2', '21' =&gt; 'Test3' }; </code></pre> <p><br></p> <h2>The problem</h2> <p>The trouble now seems to be that although both structures appear to be of the same kind I cant get my head arround, how to properly access the returned hash which is stored inside @xchange[0].</p> <p>I did try <code>%realhash = @xchange[0];</code> and <code>%realhash = \@xchange[0];</code>, but then <code>print Dumper \%realhash;</code> will output <code>$VAR1 = { 'HASH(0xa7b29c0)' =&gt; undef };</code> or <code>$VAR1 = { 'REF(0xa7833a0)' =&gt; undef };</code> respectively.</p> <p>So I either need a way to get the content of @xchange[0] inside a clean new hash or a way to foreach loop over the hash inside the @xchange[0] element.</p> <p>I guess I am getting screwed by the whole hash reference concept, but I am at a loss here and can't think of another way to google for it. </p>
 

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