(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 <C_CkMailMan.h>
#include <C_CkDns.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    HCkMailMan mailman;
    const char *emailAddr;
    const char *domain;
    HCkDns dns;
    HCkJsonObject json;
    BOOL success;
    int i;
    int count_i;

    mailman = CkMailMan_Create();

    // ...
    // ...

    emailAddr = "joe@example.com";

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

    domain = CkMailMan_mxLookup(mailman,emailAddr);
    if (CkMailMan_getLastMethodSuccess(mailman) == FALSE) {
        printf("%s\n",CkMailMan_lastErrorText(mailman));
        CkMailMan_Dispose(mailman);
        return;
    }

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

    dns = CkDns_Create();

    json = CkJsonObject_Create();

    // This gets all MX domains for an email address.  (Typically one domain.)
    // The preferred domain will be at index 0 (see below).
    success = CkDns_Query(dns,"MX",emailAddr,json);
    if (success == FALSE) {
        printf("%s\n",CkDns_lastErrorText(dns));
        CkMailMan_Dispose(mailman);
        CkDns_Dispose(dns);
        CkJsonObject_Dispose(json);
        return;
    }

    i = 0;
    count_i = CkJsonObject_SizeOfArray(json,"answer.mx");
    while (i < count_i) {
        CkJsonObject_putI(json,i);
        domain = CkJsonObject_stringOf(json,"answer.mx[i].domain");
        printf("%s\n",domain);
        i = i + 1;
    }



    CkMailMan_Dispose(mailman);
    CkDns_Dispose(dns);
    CkJsonObject_Dispose(json);

    }