Objective-C

DNS Query TXT Records

See more DNS Examples

Shows how to perform a DNS query to retrieve TXT 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: @"TXT" domain: @"x.com" answer: json];
if (success == NO) {
    NSLog(@"%@",dns.LastErrorText);
    return;
}

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

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

// {
//   "answer": {
//     "txt": [
//       {
//         "name": "x.com",
//         "ttl": 300,
//         "text": "kkdl3qb3tcrmdhfsm803p67r0my0svs8"
//       },
//       {
//         "name": "x.com",
//         "ttl": 300,
//         "text": "v=spf1 ip4:199.16.156.128/26 ip4:199.59.150.64/26 include:_spf.google.com include:spf-008d0a01.pphosted.com -all"
//       },
//       {
//         "name": "x.com",
//         "ttl": 300,
//         "text": "google-site-verification=8yQmoVhQedzlt36RPeQP41ytrEFk9aHEnde_xm0626g"
//       },
//       {
//         "name": "x.com",
//         "ttl": 300,
//         "text": "google-site-verification=F6u9mGL--d2lbLljvH3b1UUgXtevQPdcamKr9c8914A"
//       }
//     ]
//   }
// }

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

NSString *name = 0;
int ttl;
NSString *text = 0;

int i = 0;
int count_i = [[json SizeOfArray: @"answer.txt"] intValue];
while (i < count_i) {
    json.I = [NSNumber numberWithInt: i];
    name = [json StringOf: @"answer.txt[i].name"];
    ttl = [[json IntOf: @"answer.txt[i].ttl"] intValue];
    text = [json StringOf: @"answer.txt[i].text"];
    i = i + 1;
}