(PureBasic) Transition from MailMan.MxLookup to Dns.Query

Provides instructions for replacing deprecated MxLookup method calls with the Chilkat Dns class.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat PureBasic Module Download Chilkat PureBasic Module

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

Procedure ChilkatExample()

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

    ; ...
    ; ...

    emailAddr.s = "joe@example.com"

    ; ------------------------------------------------------------------------
    ; The MxLookup method is deprecated:

    domain.s = CkMailMan::ckMxLookup(mailman,emailAddr)
    If CkMailMan::ckLastMethodSuccess(mailman) = 0
        Debug CkMailMan::ckLastErrorText(mailman)
        CkMailMan::ckDispose(mailman)
        ProcedureReturn
    EndIf

    ; ------------------------------------------------------------------------
    ; Do the equivalent using the Chilkat DNS class

    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

    ; This gets all MX domains for an email address.  (Typically one domain.)
    ; The preferred domain will be at index 0 (see below).
    success.i = CkDns::ckQuery(dns,"MX",emailAddr,json)
    If success = 0
        Debug CkDns::ckLastErrorText(dns)
        CkMailMan::ckDispose(mailman)
        CkDns::ckDispose(dns)
        CkJsonObject::ckDispose(json)
        ProcedureReturn
    EndIf

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


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


    ProcedureReturn
EndProcedure