Delphi DLL

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.

Delphi DLL

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Dns, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
dns: HCkDns;
json: HCkJsonObject;
name: PWideChar;
ttl: Integer;
mname: PWideChar;
rname: PWideChar;
serial: Integer;
refresh: Integer;
retry: Integer;
expire: Integer;
minttl: Integer;
i: Integer;
count_i: Integer;

begin
success := False;

dns := CkDns_Create();

json := CkJsonObject_Create();
CkJsonObject_putEmitCompact(json,False);

success := CkDns_Query(dns,'SOA','x.com',json);
if (success = False) then
  begin
    Memo1.Lines.Add(CkDns__lastErrorText(dns));
    Exit;
  end;

Memo1.Lines.Add(CkJsonObject__emit(json));

// 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

i := 0;
count_i := CkJsonObject_SizeOfArray(json,'answer.soa');
while i < count_i do
  begin
    CkJsonObject_putI(json,i);
    name := CkJsonObject__stringOf(json,'answer.soa[i].name');
    ttl := CkJsonObject_IntOf(json,'answer.soa[i].ttl');
    mname := CkJsonObject__stringOf(json,'answer.soa[i].mname');
    rname := CkJsonObject__stringOf(json,'answer.soa[i].rname');
    serial := CkJsonObject_IntOf(json,'answer.soa[i].serial');
    refresh := CkJsonObject_IntOf(json,'answer.soa[i].refresh');
    retry := CkJsonObject_IntOf(json,'answer.soa[i].retry');
    expire := CkJsonObject_IntOf(json,'answer.soa[i].expire');
    minttl := CkJsonObject_IntOf(json,'answer.soa[i].minttl');
    i := i + 1;
  end;

CkDns_Dispose(dns);
CkJsonObject_Dispose(json);

end;