VB.NET

DNS Query TXT Records

See more DNS Examples

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

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

VB.NET

Dim success As Boolean = False

Dim dns As New Chilkat.Dns

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

success = dns.Query("TXT","x.com",json)
If (success = False) Then
    Debug.WriteLine(dns.LastErrorText)
    Exit Sub
End If


Debug.WriteLine(json.Emit())

' Sample response.
' Parsing code below..

' {
'   "answer": {
'     "txt": [
'       {
'         "name": "x.com",
'         "ttl": 300,
'         "text": "kkdl3qb3tcrmdhfsm803p67r0my0svs8"
'       },
'       {
'         "name": "x.com",
'         "ttl": 300,
'         "text": "v=spf1 ip4:199.16.156.128/26 ip4:199.59.150.64/26 include:_spf.google.com include:spf-008d0a01.pphosted.com -all"
'       },
'       {
'         "name": "x.com",
'         "ttl": 300,
'         "text": "google-site-verification=8yQmoVhQedzlt36RPeQP41ytrEFk9aHEnde_xm0626g"
'       },
'       {
'         "name": "x.com",
'         "ttl": 300,
'         "text": "google-site-verification=F6u9mGL--d2lbLljvH3b1UUgXtevQPdcamKr9c8914A"
'       }
'     ]
'   }
' }

' 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 text As String

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