(Visual FoxPro) Google Calendar Search Events (List Events with Optional Query Parameters)

See more Google Calendar Examples

Demonstrates how to specify optional query parameters for listing events. This example uses the "q" parameter to free-text search for events, and uses the "timeMin" parameter to specify a lower bound for an event's end time.

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LOCAL loJsonToken
LOCAL lnSuccess
LOCAL loHttp
LOCAL loSbUrl
LOCAL loReq
LOCAL loDt
LOCAL loSbResponse
LOCAL loJson
LOCAL lnNumEvents
LOCAL i

* 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..
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJsonToken = CreateObject('Chilkat.JsonObject')
lnSuccess = loJsonToken.LoadFile("qa_data/tokens/googleCalendar.json")
IF (loJsonToken.HasMember("access_token") = 0) THEN
    ? "No access token found."
    RELEASE loJsonToken
    CANCEL
ENDIF

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Http')
loHttp = CreateObject('Chilkat.Http')
loHttp.AuthToken = loJsonToken.StringOf("access_token")

* We'll want to build a URL with the query params..
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbUrl = CreateObject('Chilkat.StringBuilder')
loSbUrl.Append("https://www.googleapis.com/calendar/v3/calendars/{$calendarId}/events?")

* Use the HTTP request object as a helper for creating the URL encoded query param list..
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.HttpRequest')
loReq = CreateObject('Chilkat.HttpRequest')

* Find events with the word "pizza".
loReq.AddParam("q","pizza")

* Get events for the current date/time or later.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.CkDateTime')
loDt = CreateObject('Chilkat.CkDateTime')
loDt.SetFromCurrentSystemTime()
loReq.AddParam("timeMin",loDt.GetAsTimestamp(0))

* Add these query params to the URL:
loSbUrl.Append(loReq.GetUrlEncodedParams())

* Examine the URL..
? "URL: " + loSbUrl.GetAsString()

* The URL looks like this:
* https://www.googleapis.com/calendar/v3/calendars/{$calendarId}/events?q=pizza&timeMin=2017-08-11T13%3A35%3A28Z

* Let's get events in the primary calendar.  A calendar ID could have be used instead of "primary".
loHttp.SetUrlVar("calendarId","primary")
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbResponse = CreateObject('Chilkat.StringBuilder')
lnSuccess = loHttp.QuickGetSb(loSbUrl.GetAsString(),loSbResponse)
IF (lnSuccess <> 1) THEN
    ? loHttp.LastErrorText
    RELEASE loJsonToken
    RELEASE loHttp
    RELEASE loSbUrl
    RELEASE loReq
    RELEASE loDt
    RELEASE loSbResponse
    CANCEL
ENDIF

IF (loHttp.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.
    ? "Error response status: " + STR(loHttp.LastStatus)
    ? loSbResponse.GetAsString()
    RELEASE loJsonToken
    RELEASE loHttp
    RELEASE loSbUrl
    RELEASE loReq
    RELEASE loDt
    RELEASE loSbResponse
    CANCEL
ENDIF

? loSbResponse.GetAsString()

* A sample JSON response:
* (Code for parsing the Google Calendar events is shown below.)

* {
*  "kind": "calendar#events",
*  "etag": "\"p32cafkumkb7ta0g\"",
*  "summary": "support@chilkatcloud.com",
*  "updated": "2017-08-11T13:19:48.143Z",
*  "timeZone": "America/Chicago",
*  "accessRole": "owner",
*  "defaultReminders": [
*   {
*    "method": "popup",
*    "minutes": 10
*   }
*  ],
*  "nextSyncToken": "CJin09aiz9UCEJin09aiz9UCGAU=",
*  "items": [
*   {
*    "kind": "calendar#event",
*    "etag": "\"3004915160212000\"",
*    "id": "02pv1cpdp7vm11htnfi3ii7iie",
*    "status": "confirmed",
*    "htmlLink": "https://www.google.com/calendar/event?eid=MDJwdjFjcGRwN3ZtMTFodG5maTNpaTdpaWUgc3VwcG9ydEBjaGlsa2F0Y2xvdWQuY29t",
*    "created": "2017-08-11T13:19:40.000Z",
*    "updated": "2017-08-11T13:19:40.106Z",
*    "summary": "Eat Lou Malnati's Pizza",
*    "creator": {
*     "email": "support@chilkatcloud.com",
*     "self": true
*    },
*    "organizer": {
*     "email": "support@chilkatcloud.com",
*     "self": true
*    },
*    "start": {
*     "dateTime": "2017-08-12T12:00:00-05:00"
*    },
*    "end": {
*     "dateTime": "2017-08-12T13:00:00-05:00"
*    },
*    "iCalUID": "02pv1cpdp7vm11htnfi3ii7iie@google.com",
*    "sequence": 0,
*    "hangoutLink": "https://plus.google.com/hangouts/_/chilkatcloud.com/support?hceid=c3VwcG9ydEBjaGlsa2F0Y2xvdWQuY29t.02pv1cpdp7vm11htnfi3ii7iie",
*    "reminders": {
*     "useDefault": true
*    }
*   }
*  ]
* }
* 
* 

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJson = CreateObject('Chilkat.JsonObject')
loJson.LoadSb(loSbResponse)

lnNumEvents = loJson.SizeOfArray("items")
i = 0
DO WHILE i < lnNumEvents
    loJson.I = i
    ? loJson.StringOf("items[i].summary")
    ? loJson.StringOf("items[i].start.dateTime")
    ? loJson.StringOf("items[i].end.dateTime")
    ? "--"
    i = i + 1
ENDDO

* Sample output:

* Eat Lou Malnati's Pizza
* 2017-08-12T12:00:00-05:00
* 2017-08-12T13:00:00-05:00
* --

RELEASE loJsonToken
RELEASE loHttp
RELEASE loSbUrl
RELEASE loReq
RELEASE loDt
RELEASE loSbResponse
RELEASE loJson