(Objective-C) Transition from MailMan.MxLookupAll to the Chilkat DNS class

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

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

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#import <CkoMailMan.h>
#import <NSString.h>
#import <CkoStringArray.h>
#import <CkoDns.h>
#import <CkoJsonObject.h>

CkoMailMan *mailman = [[CkoMailMan alloc] init];

// ...
// ...

NSString *emailAddr = @"joe@example.com";

// ------------------------------------------------------------------------
// The MxLookupAll method is deprecated:

CkoStringArray *sa = [mailman MxLookupAll: emailAddr];
if (mailman.LastMethodSuccess == NO) {
    NSLog(@"%@",mailman.LastErrorText);
    return;
}

// ...
// ...

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

CkoDns *dns = [[CkoDns alloc] init];

CkoJsonObject *json = [[CkoJsonObject alloc] init];

// 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" domain: emailAddr answer: json];
if (success == NO) {
    NSLog(@"%@",dns.LastErrorText);
    return;
}

int i = 0;
int count_i = [[json SizeOfArray: @"answer.mx"] intValue];
while (i < count_i) {
    json.I = [NSNumber numberWithInt: i];
    NSString *domain = [json StringOf: @"answer.mx[i].domain"];
    NSLog(@"%@",domain);
    i = i + 1;
}