(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.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

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

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Dns')
loDns = CreateObject('Chilkat.Dns')

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
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