PureBasic

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.

PureBasic

IncludeFile "CkDns.pb"
IncludeFile "CkJsonObject.pb"

Procedure ChilkatExample()

    success.i = 0

    dns.i = CkDns::ckCreate()
    If dns.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    json.i = CkJsonObject::ckCreate()
    If json.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::setCkEmitCompact(json, 0)

    success = CkDns::ckQuery(dns,"MX","somebody@gmail.com",json)
    If success = 0
        Debug CkDns::ckLastErrorText(dns)
        CkDns::ckDispose(dns)
        CkJsonObject::ckDispose(json)
        ProcedureReturn
    EndIf

    Debug CkJsonObject::ckEmit(json)

    ; 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

    name.s
    ttl.i
    pref.i
    domain.s

    i.i = 0
    count_i.i = CkJsonObject::ckSizeOfArray(json,"answer.mx")
    While i < count_i
        CkJsonObject::setCkI(json, i)
        name = CkJsonObject::ckStringOf(json,"answer.mx[i].name")
        ttl = CkJsonObject::ckIntOf(json,"answer.mx[i].ttl")
        pref = CkJsonObject::ckIntOf(json,"answer.mx[i].pref")
        domain = CkJsonObject::ckStringOf(json,"answer.mx[i].domain")
        i = i + 1
    Wend


    CkDns::ckDispose(dns)
    CkJsonObject::ckDispose(json)


    ProcedureReturn
EndProcedure