(PureBasic) 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".

Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkHttp.pb"
IncludeFile "CkStringBuilder.pb"
IncludeFile "CkJsonObject.pb"

Procedure ChilkatExample()

    ; 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.i = CkJsonObject::ckCreate()
    If jsonToken.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success.i = CkJsonObject::ckLoadFile(jsonToken,"qa_data/tokens/googleCalendar.json")
    If CkJsonObject::ckHasMember(jsonToken,"access_token") = 0
        Debug "No access token found."
        CkJsonObject::ckDispose(jsonToken)
        ProcedureReturn
    EndIf

    http.i = CkHttp::ckCreate()
    If http.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkHttp::setCkAuthToken(http, CkJsonObject::ckStringOf(jsonToken,"access_token"))

    ; Let's get the primary calendar.  A calendar ID could have be used instead of "primary".
    CkHttp::ckSetUrlVar(http,"calendarId","primary")
    sbResponse.i = CkStringBuilder::ckCreate()
    If sbResponse.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkHttp::ckQuickGetSb(http,"https://www.googleapis.com/calendar/v3/calendars/{$calendarId}/events",sbResponse)
    If success <> 1
        Debug CkHttp::ckLastErrorText(http)
        CkJsonObject::ckDispose(jsonToken)
        CkHttp::ckDispose(http)
        CkStringBuilder::ckDispose(sbResponse)
        ProcedureReturn
    EndIf

    If CkHttp::ckLastStatus(http) <> 200
        ; Note: If a 401 unauthorized response is received, it likely means that the OAuth2 access token needs
        ; to be refreshed or re-fetched.
        Debug "Error response status: " + Str(CkHttp::ckLastStatus(http))
        Debug CkStringBuilder::ckGetAsString(sbResponse)
        CkJsonObject::ckDispose(jsonToken)
        CkHttp::ckDispose(http)
        CkStringBuilder::ckDispose(sbResponse)
        ProcedureReturn
    EndIf

    ; 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.i = CkJsonObject::ckCreate()
    If json.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::ckLoadSb(json,sbResponse)

    numEvents.i = CkJsonObject::ckSizeOfArray(json,"items")
    i.i = 0
    While i < numEvents
        CkJsonObject::setCkI(json, i)
        Debug CkJsonObject::ckStringOf(json,"items[i].summary")
        Debug CkJsonObject::ckStringOf(json,"items[i].start.dateTime")
        Debug CkJsonObject::ckStringOf(json,"items[i].end.dateTime")
        Debug "--"
        i = i + 1
    Wend

    ; 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
    ; --
    ; 


    CkJsonObject::ckDispose(jsonToken)
    CkHttp::ckDispose(http)
    CkStringBuilder::ckDispose(sbResponse)
    CkJsonObject::ckDispose(json)


    ProcedureReturn
EndProcedure