(C++) 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.

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#include <CkMailMan.h>
#include <CkDns.h>
#include <CkJsonObject.h>

void ChilkatSample(void)
    {
    CkMailMan mailman;

    // ...
    // ...

    const char *emailAddr = "joe@example.com";

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

    const char *domain = mailman.mxLookup(emailAddr);
    if (mailman.get_LastMethodSuccess() == false) {
        std::cout << mailman.lastErrorText() << "\r\n";
        return;
    }

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

    CkDns dns;

    CkJsonObject json;

    // This gets all MX domains for an email address.  (Typically one domain.)
    // The preferred domain will be at index 0 (see below).
    bool success = dns.Query("MX",emailAddr,json);
    if (success == false) {
        std::cout << dns.lastErrorText() << "\r\n";
        return;
    }

    int i = 0;
    int count_i = json.SizeOfArray("answer.mx");
    while (i < count_i) {
        json.put_I(i);
        domain = json.stringOf("answer.mx[i].domain");
        std::cout << domain << "\r\n";
        i = i + 1;
    }
    }