Perl Requires Chilkat v9.5.0.96+

DNS Query MX Records

See more DNS Examples

Shows how to perform a DNS query to retrieve MX records. Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

my $dns = Chilkat2::Dns->new;

my $json = Chilkat2::JsonObject->new;
$json->EmitCompact(0);

my $success = $dns->Query('MX', 'somebody@gmail.com', $json);
if (!$success) {
    print $dns->LastErrorText, "\n";
    exit;
}

print $json->Emit(), "\n";

# Sample response.
# Parsing code below..

# -------------------------------------------------------------------------------
# Note: Chilkat will return the results sorted by "pref" from lowest to highest.
# -------------------------------------------------------------------------------

# {
#   "answer": {
#     "mx": [
#       {
#         "name": "gmail.com",
#         "ttl": 491,
#         "pref": 5,
#         "domain": "gmail-smtp-in.l.google.com"
#       },
#       {
#         "name": "gmail.com",
#         "ttl": 491,
#         "pref": 10,
#         "domain": "alt1.gmail-smtp-in.l.google.com"
#       },
#       {
#         "name": "gmail.com",
#         "ttl": 491,
#         "pref": 20,
#         "domain": "alt2.gmail-smtp-in.l.google.com"
#       },
#       {
#         "name": "gmail.com",
#         "ttl": 491,
#         "pref": 30,
#         "domain": "alt3.gmail-smtp-in.l.google.com"
#       },
#       {
#         "name": "gmail.com",
#         "ttl": 491,
#         "pref": 40,
#         "domain": "alt4.gmail-smtp-in.l.google.com"
#       }
#     ]
#   }
# }

# Use this online tool to generate parsing code from sample JSON:
# Generate Parsing Code from JSON

my $name = '';
my $ttl = 0;
my $pref = 0;
my $domain = '';

my $i = 0;
my $count_i = $json->SizeOfArray('answer.mx');
while ($i < $count_i) {
    $json->I($i);
    $name = $json->StringOf('answer.mx[i].name');
    $ttl = $json->IntOf('answer.mx[i].ttl');
    $pref = $json->IntOf('answer.mx[i].pref');
    $domain = $json->StringOf('answer.mx[i].domain');
    $i = $i + 1;
}