(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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#include <CkJsonObject.h>
#include <CkHttp.h>
#include <CkStringBuilder.h>

void ChilkatSample(void)
    {
    // 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..
    CkJsonObject jsonToken;
    bool success = jsonToken.LoadFile("qa_data/tokens/googleCalendar.json");
    if (jsonToken.HasMember("access_token") == false) {
        std::cout << "No access token found." << "\r\n";
        return;
    }

    CkHttp http;
    http.put_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");
    CkStringBuilder sbResponse;
    success = http.QuickGetSb("https://www.googleapis.com/calendar/v3/calendars/{$calendarId}/events",sbResponse);
    if (success != true) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }

    if (http.get_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.
        std::cout << "Error response status: " << http.get_LastStatus() << "\r\n";
        std::cout << sbResponse.getAsString() << "\r\n";
        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
    //    }
    //   }
    //  ]
    // }
    // 

    CkJsonObject json;
    json.LoadSb(sbResponse);

    int numEvents = json.SizeOfArray("items");
    int i = 0;
    while (i < numEvents) {
        json.put_I(i);
        std::cout << json.stringOf("items[i].summary") << "\r\n";
        std::cout << json.stringOf("items[i].start.dateTime") << "\r\n";
        std::cout << json.stringOf("items[i].end.dateTime") << "\r\n";
        std::cout << "--" << "\r\n";
        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
    // --
    // 
    }