(Visual FoxPro) Read a Single Facebook Post

Demonstrates how to read the contents of a single Facebook post. A post is an individual entry in a profile's feed. The profile could be a user, page, app, or group.

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

LOCAL loOauth2
LOCAL loRest
LOCAL lnSuccess
LOCAL lcPostId
LOCAL loSbPath
LOCAL lcResponseJson
LOCAL loJson
LOCAL loDtime
LOCAL lnBLocalTime
LOCAL loDt

* 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...
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)

* This example assumes a post id was already retrieved.
* For example, it could've been retrieved by reading the user's feed:
* See Parsing the Facebook User Feed for code showing how to parse the JSON feed content.

lcPostId = "10224048320139890_10210156138515282"

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbPath = CreateObject('Chilkat.StringBuilder')
loSbPath.Append("/v2.7/")
loSbPath.Append(lcPostId)

* Select the fields we want.
* This example will select almost all the possible fields.
* See https://developers.facebook.com/docs/graph-api/reference/post/
loRest.AddQueryParam("fields","id,message,created_time,caption,description,from,link,name,object_id,picture,place,privacy,properties,shares,source,status_type,story,targeting,to,type,updated_time,with_tags")

lcResponseJson = loRest.FullRequestNoBody("GET",loSbPath.GetAsString())
IF (loRest.LastMethodSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loOauth2
    RELEASE loRest
    RELEASE loSbPath
    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 here.  
* { 
*   "id": "12345678901234567_12345678900000004",
*   "message": "Ignore my posts -- I'm doing some testing for Facebook related programming...",
*   "created_time": "2016-09-29T20:46:18+0000",
*   "from": { 
*     "name": "John Doe",
*     "id": "12345678901234567"
*   },
*   "link": "https:\/\/www.facebook.com\/photo.php?fbid=10210199026247451&set=a.1237223526054.2038240.1094202869&type=3",
*   "object_id": "10210139026347451",
*   "picture": "https:\/\/scontent.xx.fbcdn.net\/v\/t1.0-9\/14462791_10210199026647451_7830642117574407060_n.jpg?oh=a7f9ed10ce9cd81a82adeb541c60e2e2&oe=58ABB195",
*   "privacy": { 
*     "allow": "",
*     "deny": "",
*     "description": "Public",
*     "friends": "",
*     "value": "EVERYONE"
*   },
*   "status_type": "added_photos",
*   "type": "photo",
*   "updated_time": "2016-09-29T20:46:18+0000"
* }

* This is the code to parse some fields in the JSON response.
? "type: " + loJson.StringOf("type")
? "message: " + loJson.StringOf("message")
? "id: " + loJson.StringOf("id")
? "link: " + loJson.StringOf("link")
? "privacy descripton: " + loJson.StringOf("privacy.description")

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.CkDateTime')
loDtime = CreateObject('Chilkat.CkDateTime')
lnBLocalTime = 1
loDtime.SetFromTimestamp(loJson.StringOf("created_time"))
loDt = loDtime.GetDtObj(lnBLocalTime)
? STR(loDt.Month) + "/" + STR(loDt.Day) + "/" + STR(loDt.Year) + "  " + STR(loDt.Hour) + ":" + STR(loDt.Minute)
RELEASE loDt

RELEASE loOauth2
RELEASE loRest
RELEASE loSbPath
RELEASE loJson
RELEASE loDtime