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Re: Looping through nested repeated elements using XML::Simple

by pemungkah (Priest)
on Dec 13, 2006 at 07:02 UTC ( #589502=note: print w/replies, xml ) Need Help??

in reply to Looping through nested repeated elements using XML::Simple

Well, let's do what we should do when we have a data structure we don't understand: look at it in the debugger.
$ perl -d Loading DB routines from version 1.28 Editor support available. Enter h or `h h' for help, or `man perldebug' for more help. main::( my $config = XMLin("testFile.xml",forc +earray => ['person','email']); + DB<1> l 5==> my $config = XMLin("testFile.xml",forcearray => ['person','ema +il']); 6: my @persons = $config->{person}; 7: print "Size:".@persons; DB<1> c 6 # run continuously to line 6 main::( my @persons = $config->{person}; DB<2> x $config 0 HASH(0x1988e88) 'person' => ARRAY(0x19acb00) 0 HASH(0x1988f30) 'email' => ARRAY(0x19acba8) 0 '' 1 '' 'firstname' => 'Joe' 'lastname' => 'Smith' 1 HASH(0x198a0cc) 'email' => ARRAY(0x19acab8) 0 '' 'firstname' => 'Bob' 'lastname' => 'Smith' DB<3> q $
So we can see that the value of $config->{person} is actually a reference to an array, not an array itself. You'll have to dereference it to get an actual array. Try @{ $config->{person} }. The elements in the array created by this expression will be the two references to the hashes containing references to arrays containing the email values.

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Re^2: Looping through nested repeated elements using XML::Simple
by ranjan_jajodia (Monk) on Dec 13, 2006 at 07:20 UTC
    Thanks pemungkah for the explaining the way to solve this kind of problem. I was using DataDumper to see the contents but this way I can do more things while debugging.
      You're very welcome. One other thing: you can play around with expressions in the debugger as well. For instance, if you wanted to see what @{ $config->{person} } would give you, you could just enter x @{ $config->{person} } at the debugger prompt, and the debugger would happily dump it out for you.

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