Objective-C

DNS Query SOA Records

See more DNS Examples

Shows how to perform a DNS query to retrieve SOA records.

Note: This example requires Chilkat v9.5.0.96 or later.

Objective-C

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

BOOL success = NO;

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

CkoJsonObject *json = [[CkoJsonObject alloc] init];
json.EmitCompact = NO;

success = [dns Query: @"SOA" domain: @"x.com" answer: json];
if (success == NO) {
    NSLog(@"%@",dns.LastErrorText);
    return;
}

NSLog(@"%@",[json Emit]);

// Sample response.
// Parsing code below..

// {
//   "answer": {
//     "soa": [
//       {
//         "name": "x.com",
//         "ttl": 1800,
//         "mname": "alexia.ns.cloudflare.com",
//         "rname": "dns.cloudflare.com",
//         "serial": -1971124188,
//         "refresh": 10000,
//         "retry": 2400,
//         "expire": 604800,
//         "minttl": 1800
//       }
//     ]
//   }
// }

// Use this online tool to generate parsing code from sample JSON: 
// Generate Parsing Code from JSON

NSString *name = 0;
int ttl;
NSString *mname = 0;
NSString *rname = 0;
int serial;
int refresh;
int retry;
int expire;
int minttl;

int i = 0;
int count_i = [[json SizeOfArray: @"answer.soa"] intValue];
while (i < count_i) {
    json.I = [NSNumber numberWithInt: i];
    name = [json StringOf: @"answer.soa[i].name"];
    ttl = [[json IntOf: @"answer.soa[i].ttl"] intValue];
    mname = [json StringOf: @"answer.soa[i].mname"];
    rname = [json StringOf: @"answer.soa[i].rname"];
    serial = [[json IntOf: @"answer.soa[i].serial"] intValue];
    refresh = [[json IntOf: @"answer.soa[i].refresh"] intValue];
    retry = [[json IntOf: @"answer.soa[i].retry"] intValue];
    expire = [[json IntOf: @"answer.soa[i].expire"] intValue];
    minttl = [[json IntOf: @"answer.soa[i].minttl"] intValue];
    i = i + 1;
}