(Perl) 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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use chilkat();

# 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..
$jsonToken = chilkat::CkJsonObject->new();
$success = $jsonToken->LoadFile("qa_data/tokens/googleCalendar.json");
if ($jsonToken->HasMember("access_token") == 0) {
    print "No access token found." . "\r\n";
    exit;
}

$http = chilkat::CkHttp->new();
$http->put_AuthToken($jsonToken->stringOf("access_token"));

# Let's get the primary calendar.  A calendar ID could have be used instead of "primary".
$http->SetUrlVar("calendarId","primary");
$sbResponse = chilkat::CkStringBuilder->new();
$success = $http->QuickGetSb("https://www.googleapis.com/calendar/v3/calendars/{$calendarId}/events",$sbResponse);
if ($success != 1) {
    print $http->lastErrorText() . "\r\n";
    exit;
}

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.
    print "Error response status: " . $http->get_LastStatus() . "\r\n";
    print $sbResponse->getAsString() . "\r\n";
    exit;
}

# 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
#    }
#   }
#  ]
# }
# 

$json = chilkat::CkJsonObject->new();
$json->LoadSb($sbResponse);

$numEvents = $json->SizeOfArray("items");
$i = 0;
while ($i < $numEvents) {
    $json->put_I($i);
    print $json->stringOf("items[i].summary") . "\r\n";
    print $json->stringOf("items[i].start.dateTime") . "\r\n";
    print $json->stringOf("items[i].end.dateTime") . "\r\n";
    print "--" . "\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
# --
#