Dart

List Events on a Specified Google Calendar

See more Google Calendar Examples

Demonstrates how to fetch the list of events on a particular Google Calendar. The calendar can be referenced by the calendar ID, or by the keyword "primary". Dart

import 'package:chilkat/chilkat.dart';

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

  // This example uses a previously obtained access token having permission for the 
  // Google Calendar scope.

  // In this example, Get Google Calendar OAuth2 Access Token, the access
  // token was saved to a JSON file.  This example fetches the access token from the file..
  final jsonToken = CkJsonObject();
  jsonToken.loadFile('qa_data/tokens/googleCalendar.json');
  if (!jsonToken.hasMember('access_token')) {
    print('No access token found.');
    return;
  }

  final http = CkHttp();
  http.authToken = jsonToken.stringOf('access_token');

  // Let's get the primary calendar.  A calendar ID could have be used instead of "primary".
  http.setUrlVar('calendarId', 'primary');
  final sbResponse = CkStringBuilder();
  try {
    http.quickGetSb('https://www.googleapis.com/calendar/v3/calendars/{\$calendarId}/events', sbResponse);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  if (http.lastStatus != 200) {
    // Note: If a 401 unauthorized response is received, it likely means that the OAuth2 access token needs
    // to be refreshed or re-fetched.
    print('Error response status: ${http.lastStatus}');
    print(sbResponse.getAsString());
    return;
  }

  // A sample JSON response:
  // (Code for parsing the Google Calendar events is shown below.)

  // {
  //  "kind": "calendar#events",
  //  "etag": "\"p32cfpufit76da0g\"",
  //  "summary": "support@chilkatcloud.com",
  //  "updated": "2017-08-10T14:00:27.199Z",
  //  "timeZone": "America/Chicago",
  //  "accessRole": "owner",
  //  "defaultReminders": [
  //   {
  //    "method": "popup",
  //    "minutes": 10
  //   }
  //  ],
  //  "nextSyncToken": "CJj8-fLpzNUCEJj8-fLpzNUCGAU=",
  //  "items": [
  //   {
  //    "kind": "calendar#event",
  //    "etag": "\"3004746854620000\"",
  //    "id": "5jt9fopfg3rr9eftegiuq7gc5k",
  //    "status": "confirmed",
  //    "htmlLink": "https://www.google.com/calendar/event?eid=NWp0OWZvcGZnM3JyOWVmdGVnaXVxN2djNWsgc3VwcG9ydEBjaGlsa2F0Y2xvdWQuY29t",
  //    "created": "2017-08-10T13:57:07.000Z",
  //    "updated": "2017-08-10T13:57:07.310Z",
  //    "summary": "Run 10 miles",
  //    "creator": {
  //     "email": "support@chilkatcloud.com",
  //     "self": true
  //    },
  //    "organizer": {
  //     "email": "support@chilkatcloud.com",
  //     "self": true
  //    },
  //    "start": {
  //     "dateTime": "2017-08-10T12:00:00-05:00"
  //    },
  //    "end": {
  //     "dateTime": "2017-08-10T13:00:00-05:00"
  //    },
  //    "iCalUID": "5jt9fopfg3rr9eftegiuq7gc5k@google.com",
  //    "sequence": 0,
  //    "hangoutLink": "https://plus.google.com/hangouts/_/chilkatcloud.com/support?hceid=c3VwcG9ydEBjaGlsa2F0Y2xvdWQuY29t.5jt9fopfg3rr9eftegiuq7gc5k",
  //    "reminders": {
  //     "useDefault": true
  //    }
  //   },
  //   {
  //    "kind": "calendar#event",
  //    "etag": "\"3004746898118000\"",
  //    "id": "7dvh49vd219r3sq7jdueieu8rc",
  //    "status": "confirmed",
  //    "htmlLink": "https://www.google.com/calendar/event?eid=N2R2aDQ5dmQyMTlyM3NxN2pkdWVpZXU4cmMgc3VwcG9ydEBjaGlsa2F0Y2xvdWQuY29t",
  //    "created": "2017-08-10T13:57:29.000Z",
  //    "updated": "2017-08-10T13:57:29.059Z",
  //    "summary": "Eat Giordano's Pizza",
  //    "creator": {
  //     "email": "support@chilkatcloud.com",
  //     "self": true
  //    },
  //    "organizer": {
  //     "email": "support@chilkatcloud.com",
  //     "self": true
  //    },
  //    "start": {
  //     "dateTime": "2017-08-10T15:00:00-05:00"
  //    },
  //    "end": {
  //     "dateTime": "2017-08-10T16:00:00-05:00"
  //    },
  //    "iCalUID": "7dvh49vd219r3sq7jdueieu8rc@google.com",
  //    "sequence": 0,
  //    "hangoutLink": "https://plus.google.com/hangouts/_/chilkatcloud.com/support?hceid=c3VwcG9ydEBjaGlsa2F0Y2xvdWQuY29t.7dvh49vd219r3sq7jdueieu8rc",
  //    "reminders": {
  //     "useDefault": true
  //    }
  //   },
  //   {
  //    "kind": "calendar#event",
  //    "etag": "\"3004746915224000\"",
  //    "id": "5btd89ljn07bg3tlgpimcaqrro",
  //    "status": "confirmed",
  //    "htmlLink": "https://www.google.com/calendar/event?eid=NWJ0ZDg5bGpuMDdiZzN0bGdwaW1jYXFycm8gc3VwcG9ydEBjaGlsa2F0Y2xvdWQuY29t",
  //    "created": "2017-08-10T13:57:37.000Z",
  //    "updated": "2017-08-10T13:57:37.612Z",
  //    "summary": "Nap",
  //    "creator": {
  //     "email": "support@chilkatcloud.com",
  //     "self": true
  //    },
  //    "organizer": {
  //     "email": "support@chilkatcloud.com",
  //     "self": true
  //    },
  //    "start": {
  //     "dateTime": "2017-08-10T16:30:00-05:00"
  //    },
  //    "end": {
  //     "dateTime": "2017-08-10T17:30:00-05:00"
  //    },
  //    "iCalUID": "5btd89ljn07bg3tlgpimcaqrro@google.com",
  //    "sequence": 0,
  //    "hangoutLink": "https://plus.google.com/hangouts/_/chilkatcloud.com/support?hceid=c3VwcG9ydEBjaGlsa2F0Y2xvdWQuY29t.5btd89ljn07bg3tlgpimcaqrro",
  //    "reminders": {
  //     "useDefault": true
  //    }
  //   }
  //  ]
  // }
  // 

  final json = CkJsonObject();
  json.loadSb(sbResponse);

  final numEvents = json.sizeOfArray('items');
  var i = 0;
  while (i < numEvents) {
    json.i = i;
    print(json.stringOf('items[i].summary'));
    print(json.stringOf('items[i].start.dateTime'));
    print(json.stringOf('items[i].end.dateTime'));
    print('--');
    i++;
  }

  // Sample output:

  // Run 10 miles
  // 2017-08-10T12:00:00-05:00
  // 2017-08-10T13:00:00-05:00
  // --
  // Eat Giordano's Pizza
  // 2017-08-10T15:00:00-05:00
  // 2017-08-10T16:00:00-05:00
  // --
  // Nap
  // 2017-08-10T16:30:00-05:00
  // 2017-08-10T17:30:00-05:00
  // --
  // 
}