PowerBuilder

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.

PowerBuilder

integer li_rc
integer li_Success
oleobject loo_Dns
oleobject loo_Json
string ls_Name
integer li_Ttl
integer li_Pref
string ls_Domain
integer i
integer li_Count_i

li_Success = 0

loo_Dns = create oleobject
li_rc = loo_Dns.ConnectToNewObject("Chilkat.Dns")
if li_rc < 0 then
    destroy loo_Dns
    MessageBox("Error","Connecting to COM object failed")
    return
end if

loo_Json = create oleobject
li_rc = loo_Json.ConnectToNewObject("Chilkat.JsonObject")

loo_Json.EmitCompact = 0

li_Success = loo_Dns.Query("MX","somebody@gmail.com",loo_Json)
if li_Success = 0 then
    Write-Debug loo_Dns.LastErrorText
    destroy loo_Dns
    destroy loo_Json
    return
end if

Write-Debug loo_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

i = 0
li_Count_i = loo_Json.SizeOfArray("answer.mx")
do while i < li_Count_i
    loo_Json.I = i
    ls_Name = loo_Json.StringOf("answer.mx[i].name")
    li_Ttl = loo_Json.IntOf("answer.mx[i].ttl")
    li_Pref = loo_Json.IntOf("answer.mx[i].pref")
    ls_Domain = loo_Json.StringOf("answer.mx[i].domain")
    i = i + 1
loop


destroy loo_Dns
destroy loo_Json