(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".

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

// 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];
BOOL 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
// --
//