(VB.NET) DNS Query A Records

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

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

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Dim dns As New Chilkat.Dns

Dim json As New Chilkat.JsonObject
json.EmitCompact = False

Dim success As Boolean = dns.Query("A","microsoft.com",json)
If (success = False) Then
    Debug.WriteLine(dns.LastErrorText)
    Exit Sub
End If


Debug.WriteLine(json.Emit())

' Sample response.
' Parsing code below..

' {
'   "answer": {
'     "a": [
'       {
'         "name": "microsoft.com",
'         "ttl": 1528,
'         "ipv4": "20.112.250.133"
'       },
'       {
'         "name": "microsoft.com",
'         "ttl": 1528,
'         "ipv4": "20.231.239.246"
'       },
'       {
'         "name": "microsoft.com",
'         "ttl": 1528,
'         "ipv4": "20.76.201.171"
'       },
'       {
'         "name": "microsoft.com",
'         "ttl": 1528,
'         "ipv4": "20.70.246.20"
'       },
'       {
'         "name": "microsoft.com",
'         "ttl": 1528,
'         "ipv4": "20.236.44.162"
'       }
'     ]
'   }
' }

' Use this online tool to generate parsing code from sample JSON: 
' Generate Parsing Code from JSON

Dim name As String
Dim ttl As Integer
Dim ipv4 As String

Dim i As Integer = 0
Dim count_i As Integer = json.SizeOfArray("answer.a")
While i < count_i
    json.I = i
    name = json.StringOf("answer.a[i].name")
    ttl = json.IntOf("answer.a[i].ttl")
    ipv4 = json.StringOf("answer.a[i].ipv4")
    i = i + 1
End While