Re: Get info out a JSON file

[Herbie <technowombat@yahoo.com>]

Sorry, it was too obvious for me, I didn't realise keys would work on this 
kind of hash.

   for my $key ( keys %$services ) {
         print $services->{$key}->{port};
     }

Yeah, I know, I know, I should have just trusted my Learning Perl ;)

h.

On Tue, 1 Dec 2009, Herbie wrote:

> I'm attempting to read someone elses JSON files the structure of which is 
> (using Data Dumper):
>
> $VAR1 = {
>         'smtp' => {
>                     'up_time' => '*',
>                     'checks' => 2,
>                     'problem_send_to' => '*',
>                     'input' => '',
>                     'marginal_send_to' => '*',
>                     'port' => 25,
>                     'marginal' => '*',
>                     'seconds' => 2,
>                     'pow' => '*',
>                     'critical' => '*',
>                     'vital' => 'no',
>                     'up_days' => '*'
>                   },
>         'ssh' => {
>                    'up_time' => '*',
>                    'checks' => 2,
>                    'problem_send_to' => '*',
>                    'input' => '',
>                    'marginal_send_to' => '*',
>                    'hostname' => 'reginald.some.net',
>                    'port' => 22,
>                    'marginal' => 10,
>                    'seconds' => 2,
>                    'pow' => '*',
>                    'critical' => '*',
>                    'vital' => 'no',
>                    'up_days' => '*'
>                  }
>       };
>
> All I'm interested in, is the value of the port number for each service, if I 
> know the service name in advance I can just do something like
>
> print $services->{ssh}->{port};
> print $services->{smtp}->{port};
>
> which is well and good, but how do I loop through them if I don't know the 
> service name (ssh, smtp, whatever) in advance? NB the service name doesn't 
> always correspond to what is in /etc/services.
>
> h.
>
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