(C++) DNS Query MX Records

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

Note: This example requires Chilkat v9.5.0.96 or later.

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#include <CkDns.h>
#include <CkJsonObject.h>

void ChilkatSample(void)
    {
    CkDns dns;

    CkJsonObject json;
    json.put_EmitCompact(false);

    bool success = dns.Query("MX","somebody@gmail.com",json);
    if (success == false) {
        std::cout << dns.lastErrorText() << "\r\n";
        return;
    }

    std::cout << json.emit() << "\r\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

    const char *name = 0;
    int ttl;
    int pref;
    const char *domain = 0;

    int i = 0;
    int count_i = json.SizeOfArray("answer.mx");
    while (i < count_i) {
        json.put_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;
    }
    }