Visual FoxPro

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.

Visual FoxPro

LOCAL lnSuccess
LOCAL loDns
LOCAL loJson
LOCAL lcName
LOCAL lnTtl
LOCAL lnPref
LOCAL lcDomain
LOCAL i
LOCAL lnCount_i

lnSuccess = 0

loDns = CreateObject('Chilkat.Dns')

loJson = CreateObject('Chilkat.JsonObject')
loJson.EmitCompact = 0

lnSuccess = loDns.Query("MX","somebody@gmail.com",loJson)
IF (lnSuccess = 0) THEN
    ? loDns.LastErrorText
    RELEASE loDns
    RELEASE loJson
    CANCEL
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