(PowerBuilder) Cloudfare DNS over HTTPS

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.

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

integer li_rc
oleobject loo_Http
string ls_Url
string ls_JsonResp
oleobject loo_Json
integer li_Status
integer li_TC
integer li_RD
integer li_RA
integer li_AD
integer li_CD
integer i
integer li_Count_i
string ls_Name
integer li_Type
integer li_TTL
string ls_Data
string ls_IpAddr

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

loo_Http = create oleobject
// Use "Chilkat_9_5_0.Http" for versions of Chilkat < 10.0.0
li_rc = loo_Http.ConnectToNewObject("Chilkat.Http")
if li_rc < 0 then
    destroy loo_Http
    MessageBox("Error","Connecting to COM object failed")
    return
end if

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

loo_Http.Accept = "application/dns-json"

ls_Url = "https://cloudflare-dns.com/dns-query?name=chilkat.io&type=A"

ls_JsonResp = loo_Http.QuickGetStr(ls_Url)
if loo_Http.LastMethodSuccess <> 1 then
    Write-Debug loo_Http.LastErrorText
    destroy loo_Http
    return
end if

Write-Debug "Response Status Code: " + string(loo_Http.LastStatus)

loo_Json = create oleobject
// Use "Chilkat_9_5_0.JsonObject" for versions of Chilkat < 10.0.0
li_rc = loo_Json.ConnectToNewObject("Chilkat.JsonObject")

loo_Json.Load(ls_JsonResp)
loo_Json.EmitCompact = 0
Write-Debug loo_Json.Emit()

if loo_Http.LastStatus <> 200 then
    Write-Debug "Failed."
    destroy loo_Http
    destroy loo_Json
    return
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

li_Status = loo_Json.IntOf("Status")
li_TC = loo_Json.BoolOf("TC")
li_RD = loo_Json.BoolOf("RD")
li_RA = loo_Json.BoolOf("RA")
li_AD = loo_Json.BoolOf("AD")
li_CD = loo_Json.BoolOf("CD")
i = 0
li_Count_i = loo_Json.SizeOfArray("Question")
do while i < li_Count_i
    loo_Json.I = i
    ls_Name = loo_Json.StringOf("Question[i].name")
    li_Type = loo_Json.IntOf("Question[i].type")
    i = i + 1
loop
i = 0
li_Count_i = loo_Json.SizeOfArray("Answer")
// The domain name resolves to 1 or more IP addresses..
do while i < li_Count_i
    loo_Json.I = i
    ls_Name = loo_Json.StringOf("Answer[i].name")
    li_Type = loo_Json.IntOf("Answer[i].type")
    li_TTL = loo_Json.IntOf("Answer[i].TTL")
    ls_IpAddr = loo_Json.StringOf("Answer[i].data")

    Write-Debug "IP Address: " + ls_IpAddr
    i = i + 1
loop


destroy loo_Http
destroy loo_Json