(Visual FoxPro) Facebook User Feed (Read Posts)

Demonstrates how to read the feed of posts (including status updates) and links published by this person, or by others on this person's profile. This introductory example gets the first few posts.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL loOauth2
LOCAL loRest
LOCAL lnSuccess
LOCAL lcResponseJson
LOCAL loJson
LOCAL loDtime
LOCAL lnBLocalTime
LOCAL loDt
LOCAL i
LOCAL lnNumItems
LOCAL lcMessage
LOCAL lcStory
LOCAL lcPrevUrl
LOCAL lcNextUrl

* This example requires the Chilkat API to have been previously unlocked.
* See Global Unlock Sample for sample code.

* This example assumes a previously obtained an access token
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.OAuth2')
loOauth2 = CreateObject('Chilkat.OAuth2')
loOauth2.AccessToken = "FACEBOOK-ACCESS-TOKEN"

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Rest')
loRest = CreateObject('Chilkat.Rest')

* Connect to Facebook and send the following GET request:
lnSuccess = loRest.Connect("graph.facebook.com",443,1,1)
IF (lnSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loOauth2
    RELEASE loRest
    CANCEL
ENDIF

* Provide the authentication credentials (i.e. the access key)
loRest.SetAuthOAuth2(loOauth2)

* We could limit the number of posts.  The default limit is 25.
loRest.AddQueryParam("limit","5")

lcResponseJson = loRest.FullRequestNoBody("GET","/v2.7/me/feed")
IF (loRest.LastMethodSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loOauth2
    RELEASE loRest
    CANCEL
ENDIF

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJson = CreateObject('Chilkat.JsonObject')
loJson.EmitCompact = 0
loJson.Load(lcResponseJson)

* Show the JSON in human-readable format.
? loJson.Emit()

* A sample JSON response is shown below.  
* This is the code to parse the JSON response.

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.CkDateTime')
loDtime = CreateObject('Chilkat.CkDateTime')
lnBLocalTime = 1

i = 0
lnNumItems = loJson.SizeOfArray("data")
DO WHILE i < lnNumItems
    loJson.I = i
    ? "--- " + STR(i)
    lcMessage = loJson.StringOf("data[i].message")
    IF (loJson.LastMethodSuccess = 1) THEN
        ? "message: " + lcMessage
    ENDIF

    lcStory = loJson.StringOf("data[i].story")
    IF (loJson.LastMethodSuccess = 1) THEN
        ? "story: " + lcStory
    ENDIF

    ? "id: " + loJson.StringOf("data[i].id")

    * We can load the created_time into a CkDateTime...
    loDtime.SetFromTimestamp(loJson.StringOf("data[i].created_time"))
    loDt = loDtime.GetDtObj(lnBLocalTime)
    ? STR(loDt.Month) + "/" + STR(loDt.Day) + "/" + STR(loDt.Year) + "  " + STR(loDt.Hour) + ":" + STR(loDt.Minute)
    RELEASE loDt
    i = i + 1
ENDDO

* Finally, there are two paging URLs at the very bottom.  Those can be accessed as shown:
lcPrevUrl = loJson.StringOf("paging.previous")
? "URL for previous page: " + lcPrevUrl

lcNextUrl = loJson.StringOf("paging.next")
? "URL for next page: " + lcNextUrl

* -------------------------------------------------------------------
* This is a sample JSON response..
* { 
*   "data": [
*     { 
*       "message": "This is the first post.",
*       "created_time": "2016-09-28T14:36:45+0000",
*       "id": "12345678901234567_12345678900000001"
*     },
*     { 
*       "message": "This is the 2nd post.",
*       "created_time": "2016-09-27T03:26:12+0000",
*       "id": "12345678901234567_12345678900000002"
*     },
*     { 
*       "story": "John Doe shared Mary's post.",
*       "created_time": "2016-09-26T15:45:10+0000",
*       "id": "12345678901234567_12345678900000003"
*     },
*     { 
*       "message": "https:\/\/www.somewebsite.org\/?ID=8158",
*       "created_time": "2016-09-26T02:29:20+0000",
*       "id": "12345678901234567_12345678900000004"
*     },
*     { 
*       "message": "http:\/\/blog.somebody.com\/post\/123",
*       "created_time": "2016-09-26T02:02:56+0000",
*       "id": "12345678901234567_12345678900000005"
*     },
*     { 
*       "story": "John Doe shared Bill's photo.",
*       "created_time": "2016-09-25T15:32:09+0000",
*       "id": "12345678901234567_12345678900000006"
*     },
*     { 
*       "message": "Check this out...",
*       "story": "John Doe shared NPR Music's video.",
*       "created_time": "2016-09-25T14:54:52+0000",
*       "id": "12345678901234567_12345678900000007"
*     },
*     { 
*       "message": "Yet another post...",
*       "created_time": "2016-09-24T17:21:30+0000",
*       "id": "12345678901234567_12345678900000008"
*     },
*     { 
*       "message": "http:\/\/www.somewhere.com\/blahblahblah\/",
*       "created_time": "2016-09-23T22:20:29+0000",
*       "id": "12345678901234567_12345678900000009"
*     },
*     { 
*       "message": "At Lincoln marsh ...",
*       "story": "John Doe added 2 new photos.",
*       "created_time": "2016-09-19T02:00:43+0000",
*       "id": "12345678901234567_12345678900000010"
*     },
*     { 
*       "message": "I would've went for a swim had it not been for the sign",
*       "created_time": "2016-09-19T01:59:47+0000",
*       "id": "12345678901234567_12345678900000011"
*     },
*     { 
*       "story": "John Doe shared Steve's video.",
*       "created_time": "2016-09-17T22:00:02+0000",
*       "id": "12345678901234567_12345678900000012"
*     },
*     { 
*       "message": "Another sample message...",
*       "story": "John Doe shared XYZ's post.",
*       "created_time": "2016-09-17T14:13:16+0000",
*       "id": "12345678901234567_12345678900000013"
*     },
*     { 
*       "message": "Hello World!",
*       "created_time": "2016-09-16T23:17:13+0000",
*       "id": "12345678901234567_12345678900000014"
*     },
*     { 
*       "message": "https:\/\/www.youtube.com\/watch?v=xyz",
*       "created_time": "2016-09-15T04:13:02+0000",
*       "id": "12345678901234567_12345678900000015"
*     },
*     { 
*       "story": "John Doe shared Emily's photo.",
*       "created_time": "2016-09-14T16:37:10+0000",
*       "id": "12345678901234567_12345678900000016"
*     },
*     { 
*       "story": "John Doe shared Vincent's photo.",
*       "created_time": "2016-09-14T14:03:42+0000",
*       "id": "12345678901234567_12345678900000017"
*     },
*     { 
*       "message": "https:\/\/www.chilkatsoft.com\/",
*       "created_time": "2016-09-14T02:29:37+0000",
*       "id": "12345678901234567_12345678900000018"
*     },
*     { 
*       "message": "So cool!  Marcus jamming with this 16 year old kid...",
*       "created_time": "2016-09-13T17:04:53+0000",
*       "id": "12345678901234567_12345678900000019"
*     },
*     { 
*       "message": "Wow!",
*       "story": "John Doe shared Somebody's post.",
*       "created_time": "2016-09-13T14:11:18+0000",
*       "id": "12345678901234567_12345678900000020"
*     }
*   ],
*   "paging": { 
*     "previous": "https:\/\/graph.facebook.com\/v2.7\/12345678901234567\/feed?since=1475073405&limit=25&__paging_token=enc_abcT9x9GFabcTxvnyXZC0xnHZCrH2h4yjNZCZAUabcZAI9TyZBibwat6wCYiSFTxR4nSDZAkzaN8vIaEPmqrabc1QTIbGac&__previous=1",
*     "next": "https:\/\/graph.facebook.com\/v2.7\/12345678901234567\/feed?limit=25&until=1473426350&__paging_token=enc_AdDFWabcYtV5ob6lFO8LZAMhm7LKCxntawqqabcZALyC8WZB8Th2lON7HGuJRabzW6Ivfm93LORIw9NNBuHpob7abcjh"
*   }
* }
* 

RELEASE loOauth2
RELEASE loRest
RELEASE loJson
RELEASE loDtime