(Lianja) 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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loDns = createobject("CkDns")

loJson = createobject("CkJsonObject")
loJson.EmitCompact = .F.

llSuccess = loDns.Query("MX","somebody@gmail.com",loJson)
if (llSuccess = .F.) then
    ? loDns.LastErrorText
    release loDns
    release loJson
    return
endif

? loJson.Emit()

// 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

i = 0
lnCount_i = loJson.SizeOfArray("answer.mx")
do while i < lnCount_i
    loJson.I = i
    lcName = loJson.StringOf("answer.mx[i].name")
    lnTtl = loJson.IntOf("answer.mx[i].ttl")
    lnPref = loJson.IntOf("answer.mx[i].pref")
    lcDomain = loJson.StringOf("answer.mx[i].domain")
    i = i + 1
enddo


release loDns
release loJson