Objective-C

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". Objective-C

#import <CkoJsonObject.h>
#import <CkoHttp.h>
#import <CkoStringBuilder.h>

BOOL success = NO;

//  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..
CkoJsonObject *jsonToken = [[CkoJsonObject alloc] init];
success = [jsonToken LoadFile: @"qa_data/tokens/googleCalendar.json"];
if ([jsonToken HasMember: @"access_token"] == NO) {
    NSLog(@"%@",@"No access token found.");
    return;
}

CkoHttp *http = [[CkoHttp alloc] init];
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" value: @"primary"];
CkoStringBuilder *sbResponse = [[CkoStringBuilder alloc] init];
success = [http QuickGetSb: @"https://www.googleapis.com/calendar/v3/calendars/{$calendarId}/events" sbContent: sbResponse];
if (success != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

if ([http.LastStatus intValue] != 200) {
    //  Note: If a 401 unauthorized response is received, it likely means that the OAuth2 access token needs
    //  to be refreshed or re-fetched.
    NSLog(@"%@%d",@"Error response status: ",[http.LastStatus intValue]);
    NSLog(@"%@",[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
//     }
//    }
//   ]
//  }
//  

CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json LoadSb: sbResponse];

int numEvents = [[json SizeOfArray: @"items"] intValue];
int i = 0;
while (i < numEvents) {
    json.I = [NSNumber numberWithInt: i];
    NSLog(@"%@",[json StringOf: @"items[i].summary"]);
    NSLog(@"%@",[json StringOf: @"items[i].start.dateTime"]);
    NSLog(@"%@",[json StringOf: @"items[i].end.dateTime"]);
    NSLog(@"%@",@"--");
    i = i + 1;
}

//  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
//  --
//