Lazarus Pascal

MaxMind IPv4 Geolocation Lookup

See more Geolocation Examples

Demonstrates how to lookup Geolocation data for an IPv4 address using the MaxMind GeoIP2 Precision Web Service. Lazarus Pascal

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.JsonObject,
  Chilkat.Http;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  http: THttp;
  jsonStr: string;
  json: TJsonObject;
  continentCode: string;
  continentGeoname_id: Integer;
  continentNamesJa: string;
  continentNamesPt_BR: string;
  continentNamesRu: string;
  continentNamesZh_CN: string;
  continentNamesDe: string;
  continentNamesEn: string;
  continentNamesEs: string;
  continentNamesFr: string;
  countryIs_in_european_union: Boolean;
  countryIso_code: string;
  countryGeoname_id: Integer;
  countryNamesFr: string;
  countryNamesJa: string;
  countryNamesPt_BR: string;
  countryNamesRu: string;
  countryNamesZh_CN: string;
  countryNamesDe: string;
  countryNamesEn: string;
  countryNamesEs: string;
  maxmindQueries_remaining: Integer;
  registered_countryIs_in_european_union: Boolean;
  registered_countryIso_code: string;
  registered_countryGeoname_id: Integer;
  registered_countryNamesEs: string;
  registered_countryNamesFr: string;
  registered_countryNamesJa: string;
  registered_countryNamesPt_BR: string;
  registered_countryNamesRu: string;
  registered_countryNamesZh_CN: string;
  registered_countryNamesDe: string;
  registered_countryNamesEn: string;
  traitsIp_address: string;

begin
  success := False;

  //  This example requires the Chilkat API to have been previously unlocked.
  //  See Global Unlock Sample for sample code.

  http := THttp.Create;

  http.Login := 'MAXMIND_ACCOUNT_ID';
  http.Password := 'MAXMIND_LICENSE_KEY';
  http.Accept := 'application/json';

  //  Lookup an IPv4 address: 149.250.207.170  (this was a randomly chosen address)
  jsonStr := http.QuickGetStr('https://geoip.maxmind.com/geoip/v2.1/country/149.250.207.170');
  if (http.LastMethodSuccess = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  json := TJsonObject.Create;
  json.EmitCompact := False;
  success := json.Load(jsonStr);

  WriteLn(json.Emit());

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

  //  {
  //    "continent": {
  //      "code": "EU",
  //      "geoname_id": 6255148,
  //      "names": {
  //        "ja": "?????",
  //        "pt-BR": "Europa",
  //        "ru": "??????",
  //        "zh-CN": "??",
  //        "de": "Europa",
  //        "en": "Europe",
  //        "es": "Europa",
  //        "fr": "Europe"
  //      }
  //    },
  //    "country": {
  //      "is_in_european_union": true,
  //      "iso_code": "DE",
  //      "geoname_id": 2921044,
  //      "names": {
  //        "fr": "Allemagne",
  //        "ja": "????????",
  //        "pt-BR": "Alemanha",
  //        "ru": "????????",
  //        "zh-CN": "??",
  //        "de": "Deutschland",
  //        "en": "Germany",
  //        "es": "Alemania"
  //      }
  //    },
  //    "maxmind": {
  //      "queries_remaining": 49999
  //    },
  //    "registered_country": {
  //      "is_in_european_union": true,
  //      "iso_code": "DE",
  //      "geoname_id": 2921044,
  //      "names": {
  //        "es": "Alemania",
  //        "fr": "Allemagne",
  //        "ja": "????????",
  //        "pt-BR": "Alemanha",
  //        "ru": "????????",
  //        "zh-CN": "??",
  //        "de": "Deutschland",
  //        "en": "Germany"
  //      }
  //    },
  //    "traits": {
  //      "ip_address": "149.250.207.170"
  //    }
  //  }
  //  
  //  

  continentCode := json.StringOf('continent.code');
  continentGeoname_id := json.IntOf('continent.geoname_id');
  continentNamesJa := json.StringOf('continent.names.ja');
  continentNamesPt_BR := json.StringOf('continent.names.pt-BR');
  continentNamesRu := json.StringOf('continent.names.ru');
  continentNamesZh_CN := json.StringOf('continent.names.zh-CN');
  continentNamesDe := json.StringOf('continent.names.de');
  continentNamesEn := json.StringOf('continent.names.en');
  continentNamesEs := json.StringOf('continent.names.es');
  continentNamesFr := json.StringOf('continent.names.fr');
  countryIs_in_european_union := json.BoolOf('country.is_in_european_union');
  countryIso_code := json.StringOf('country.iso_code');
  countryGeoname_id := json.IntOf('country.geoname_id');
  countryNamesFr := json.StringOf('country.names.fr');
  countryNamesJa := json.StringOf('country.names.ja');
  countryNamesPt_BR := json.StringOf('country.names.pt-BR');
  countryNamesRu := json.StringOf('country.names.ru');
  countryNamesZh_CN := json.StringOf('country.names.zh-CN');
  countryNamesDe := json.StringOf('country.names.de');
  countryNamesEn := json.StringOf('country.names.en');
  countryNamesEs := json.StringOf('country.names.es');
  maxmindQueries_remaining := json.IntOf('maxmind.queries_remaining');
  registered_countryIs_in_european_union := json.BoolOf('registered_country.is_in_european_union');
  registered_countryIso_code := json.StringOf('registered_country.iso_code');
  registered_countryGeoname_id := json.IntOf('registered_country.geoname_id');
  registered_countryNamesEs := json.StringOf('registered_country.names.es');
  registered_countryNamesFr := json.StringOf('registered_country.names.fr');
  registered_countryNamesJa := json.StringOf('registered_country.names.ja');
  registered_countryNamesPt_BR := json.StringOf('registered_country.names.pt-BR');
  registered_countryNamesRu := json.StringOf('registered_country.names.ru');
  registered_countryNamesZh_CN := json.StringOf('registered_country.names.zh-CN');
  registered_countryNamesDe := json.StringOf('registered_country.names.de');
  registered_countryNamesEn := json.StringOf('registered_country.names.en');
  traitsIp_address := json.StringOf('traits.ip_address');


  http.Free;
  json.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.