React Native Requires Chilkat v9.5.0.96+

DNS Query A Records

See more DNS Examples

Shows how to perform a DNS query to retrieve A records. React Native

import { Dns, JsonObject } from '@chilkat/react-native'

async function chilkatExample() {
  const dns = new Dns();

  const json = new JsonObject();
  json.emitCompact = false;

  try {
    await dns.queryAsync('A', 'microsoft.com', json);
  } catch {
    console.log(dns.lastErrorText);
    return;
  }

  console.log(json.emit());

  // Sample response.
  // Parsing code below..

  // {
  //   "answer": {
  //     "a": [
  //       {
  //         "name": "microsoft.com",
  //         "ttl": 1528,
  //         "ipv4": "20.112.250.133"
  //       },
  //       {
  //         "name": "microsoft.com",
  //         "ttl": 1528,
  //         "ipv4": "20.231.239.246"
  //       },
  //       {
  //         "name": "microsoft.com",
  //         "ttl": 1528,
  //         "ipv4": "20.76.201.171"
  //       },
  //       {
  //         "name": "microsoft.com",
  //         "ttl": 1528,
  //         "ipv4": "20.70.246.20"
  //       },
  //       {
  //         "name": "microsoft.com",
  //         "ttl": 1528,
  //         "ipv4": "20.236.44.162"
  //       }
  //     ]
  //   }
  // }

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

  let name = '';
  let ttl = 0;
  let ipv4 = '';

  let i = 0;
  const countI = json.sizeOfArray('answer.a');
  while (i < countI) {
    json.i = i;
    name = json.stringOf('answer.a[i].name');
    ttl = json.intOf('answer.a[i].ttl');
    ipv4 = json.stringOf('answer.a[i].ipv4');
    i++;
  }
}