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parse json with perl

Posted on 2015-01-03
2
838 Views
Last Modified: 2015-01-05
Hi,

Im trying to parse some simple json with a perl script.

Heres the Json :
[
    {
        "to_user": "1234567",
        "message": "test 1"
    },
    {
        "to_user": "345456657",
        "message": "test 2"
    },
    {
        "to_user": "45667324",
        "message": "test 3"
    }
]

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my perl errors with "NOT A HASH REFERENCE", I obviously have my code wrong, but cant find out how to fix it!

Heres my Code :
use HTTP::Request;
use LWP::UserAgent;




my $json = encode_json \%message;
my $uri = 'http://xxxx.com/server/imessage/get_messages.php';


    my $req = HTTP::Request->new('POST', $uri);
    $req->header( 'Content-Type' => 'application/json' );
    $req->content( $json );
    my $lwp = LWP::UserAgent->new;
    $response = $lwp->request( $req );

    if ($response->decoded_content ne "")
    {
        print "[$datestring] ";
          my $decoded_json = decode_json($response->decoded_content);
        print $decoded_json->{"to_user"} ;    #ERROR line
    }

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I understand I need to loop through the results and then display them individually but I cant figure out how :(

thank you
0
Comment
Question by:jellydeal
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2 Comments
 
LVL 26

Accepted Solution

by:
wilcoxon earned 500 total points
ID: 40529423
The JSON handling looks correct but decode_json returns a ref so you need to loop over that (based on your json, it should be an arrayref).
use strict;
use warnigns;
use HTTP::Request;
use LWP::UserAgent;

my $json = encode_json \%message;
my $uri = 'http://xxxx.com/server/imessage/get_messages.php';

    my $req = HTTP::Request->new('POST', $uri);
    $req->header( 'Content-Type' => 'application/json' );
    $req->content( $json );
    my $lwp = LWP::UserAgent->new;
    $response = $lwp->request( $req );

    if ($response->decoded_content ne "") {
        print "[$datestring] ";
        my $decoded_json = decode_json($response->decoded_content);
        foreach my $ent (@$decoded_json) {
            print $ent->{"to_user"} ;
        }
    }

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0
 

Author Closing Comment

by:jellydeal
ID: 40531615
fantastic.. worked perfect.. thank you
0

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