Visual Basic 6.0

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 Basic 6.0

Dim success As Long
success = 0

Dim dns As New ChilkatDns

Dim json As New ChilkatJsonObject
json.EmitCompact = 0

success = dns.Query("MX","somebody@gmail.com",json)
If (success = 0) Then
    Debug.Print dns.LastErrorText
    Exit Sub
End If

Debug.Print json.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

Dim name As String
Dim ttl As Long
Dim pref As Long
Dim domain As String

Dim i As Long
i = 0
Dim count_i As Long
count_i = json.SizeOfArray("answer.mx")
Do While i < count_i
    json.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
Loop