Visual Basic 6.0

Cloudfare DNS over HTTPS

See more Cloudfare Examples

Cloudflare offers a DNS over HTTPS resolver at: https://cloudflare-dns.com/dns-query

This example demonstrates how to do a DNS lookup for a domain using Cloudfare's HTTPS resolver.

Visual Basic 6.0

' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim http As New ChilkatHttp

' Send the following CURL request:   curl -H 'accept: application/dns-json' 'https://cloudflare-dns.com/dns-query?name=chilkat.io&type=A'

http.Accept = "application/dns-json"

Dim url As String
url = "https://cloudflare-dns.com/dns-query?name=chilkat.io&type=A"

Dim jsonResp As String
jsonResp = http.QuickGetStr(url)
If (http.LastMethodSuccess <> 1) Then
    Debug.Print http.LastErrorText
    Exit Sub
End If

Debug.Print "Response Status Code: " & http.LastStatus

Dim json As New ChilkatJsonObject
success = json.Load(jsonResp)
json.EmitCompact = 0
Debug.Print json.Emit()

If (http.LastStatus <> 200) Then
    Debug.Print "Failed."
    Exit Sub
End If

' Sample output...
' (See the parsing code below..)
' 

' {
'   "Status": 0,
'   "TC": false,
'   "RD": true,
'   "RA": true,
'   "AD": false,
'   "CD": false,
'   "Question": [
'     {
'       "name": "chilkat.io.",
'       "type": 1
'     }
'   ],
'   "Answer": [
'     {
'       "name": "chilkat.io.",
'       "type": 1,
'       "TTL": 900,
'       "data": "52.25.83.238"
'     }
'   ]
' }

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

Dim Status As Long
Dim TC As Long
Dim RD As Long
Dim RA As Long
Dim AD As Long
Dim CD As Long
Dim i As Long
Dim count_i As Long
Dim name As String
Dim type As Long
Dim TTL As Long
Dim data As String
Dim ipAddr As String

Status = json.IntOf("Status")
TC = json.BoolOf("TC")
RD = json.BoolOf("RD")
RA = json.BoolOf("RA")
AD = json.BoolOf("AD")
CD = json.BoolOf("CD")
i = 0
count_i = json.SizeOfArray("Question")
Do While i < count_i
    json.I = i
    name = json.StringOf("Question[i].name")
    type = json.IntOf("Question[i].type")
    i = i + 1
Loop
i = 0
count_i = json.SizeOfArray("Answer")
' The domain name resolves to 1 or more IP addresses..
Do While i < count_i
    json.I = i
    name = json.StringOf("Answer[i].name")
    type = json.IntOf("Answer[i].type")
    TTL = json.IntOf("Answer[i].TTL")
    ipAddr = json.StringOf("Answer[i].data")

    Debug.Print "IP Address: " & ipAddr
    i = i + 1
Loop