(DataFlex) 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 ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-win32.pkg

Procedure Test
    Handle hoMailman
    String sEmailAddr
    String sDomain
    Handle hoDns
    Variant vJson
    Handle hoJson
    Boolean iSuccess
    Integer i
    Integer iCount_i
    String sTemp1
    Boolean bTemp1

    Get Create (RefClass(cComChilkatMailMan)) To hoMailman
    If (Not(IsComObjectCreated(hoMailman))) Begin
        Send CreateComObject of hoMailman
    End

    // ...
    // ...

    Move "joe@example.com" To sEmailAddr

    // ------------------------------------------------------------------------
    // The MxLookup method is deprecated:

    Get ComMxLookup Of hoMailman sEmailAddr To sDomain
    Get ComLastMethodSuccess Of hoMailman To bTemp1
    If (bTemp1 = False) Begin
        Get ComLastErrorText Of hoMailman To sTemp1
        Showln sTemp1
        Procedure_Return
    End

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

    Get Create (RefClass(cComChilkatDns)) To hoDns
    If (Not(IsComObjectCreated(hoDns))) Begin
        Send CreateComObject of hoDns
    End

    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End

    // This gets all MX domains for an email address.  (Typically one domain.)
    // The preferred domain will be at index 0 (see below).
    Get pvComObject of hoJson to vJson
    Get ComQuery Of hoDns "MX" sEmailAddr vJson To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoDns To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Move 0 To i
    Get ComSizeOfArray Of hoJson "answer.mx" To iCount_i
    While (i < iCount_i)
        Set ComI Of hoJson To i
        Get ComStringOf Of hoJson "answer.mx[i].domain" To sDomain
        Showln sDomain
        Move (i + 1) To i
    Loop



End_Procedure