Xbase++

DNS Query MX Records

See more DNS Examples

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

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

Xbase++

LOCAL nSuccess
LOCAL oDns
LOCAL oJson
LOCAL cName
LOCAL nTtl
LOCAL nPref
LOCAL cDomain
LOCAL i
LOCAL nCount_i

nSuccess := 0

oDns := CreateObject("Chilkat.Dns")

oJson := CreateObject("Chilkat.JsonObject")
oJson:EmitCompact := 0

nSuccess := oDns:Query("MX", "somebody@gmail.com", oJson)
IF (nSuccess == 0)
    ? oDns:LastErrorText
    oDns:destroy()
    oJson:destroy()
    RETURN
ENDIF

? oJson: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
nCount_i := oJson:SizeOfArray("answer.mx")
DO WHILE i < nCount_i
    oJson:I := i
    cName := oJson:StringOf("answer.mx[i].name")
    nTtl := oJson:IntOf("answer.mx[i].ttl")
    nPref := oJson:IntOf("answer.mx[i].pref")
    cDomain := oJson:StringOf("answer.mx[i].domain")
    i := i + 1
ENDDO

oDns:destroy()
oJson:destroy()