(VB.NET) 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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' 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..
Dim jsonToken As New Chilkat.JsonObject
Dim success As Boolean = jsonToken.LoadFile("qa_data/tokens/googleCalendar.json")
If (jsonToken.HasMember("access_token") = False) Then
    Debug.WriteLine("No access token found.")
    Exit Sub
End If

Dim http As New Chilkat.Http
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")
Dim sbResponse As New Chilkat.StringBuilder
success = http.QuickGetSb("https://www.googleapis.com/calendar/v3/calendars/{$calendarId}/events",sbResponse)
If (success <> True) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


If (http.LastStatus <> 200) Then
    ' Note: If a 401 unauthorized response is received, it likely means that the OAuth2 access token needs
    ' to be refreshed or re-fetched.
    Debug.WriteLine("Error response status: " & http.LastStatus)
    Debug.WriteLine(sbResponse.GetAsString())
    Exit Sub
End If


' 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
'    }
'   }
'  ]
' }
' 

Dim json As New Chilkat.JsonObject
json.LoadSb(sbResponse)

Dim numEvents As Integer = json.SizeOfArray("items")
Dim i As Integer = 0
While i < numEvents
    json.I = i
    Debug.WriteLine(json.StringOf("items[i].summary"))
    Debug.WriteLine(json.StringOf("items[i].start.dateTime"))
    Debug.WriteLine(json.StringOf("items[i].end.dateTime"))
    Debug.WriteLine("--")
    i = i + 1
End While

' 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
' --
'