(Xojo Plugin) 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.

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// 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
Dim oauth2 As New Chilkat.OAuth2
oauth2.AccessToken = "FACEBOOK-ACCESS-TOKEN"

Dim rest As New Chilkat.Rest

// Connect to Facebook...
Dim success As Boolean
success = rest.Connect("graph.facebook.com",443,True,True)
If (success <> True) Then
    System.DebugLog(rest.LastErrorText)
    Return
End If

// Provide the authentication credentials (i.e. the access key)
success = rest.SetAuthOAuth2(oauth2)

// 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.

Dim postId As String
postId = "10224048320139890_10210156138515282"

Dim sbPath As New Chilkat.StringBuilder
success = sbPath.Append("/v2.7/")
success = sbPath.Append(postId)

// Select the fields we want.
// This example will select almost all the possible fields.
// See https://developers.facebook.com/docs/graph-api/reference/post/
success = rest.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")

Dim responseJson As String
responseJson = rest.FullRequestNoBody("GET",sbPath.GetAsString())
If (rest.LastMethodSuccess <> True) Then
    System.DebugLog(rest.LastErrorText)
    Return
End If

Dim json As New Chilkat.JsonObject
json.EmitCompact = False
success = json.Load(responseJson)

// Show the JSON in human-readable format.
System.DebugLog(json.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.
System.DebugLog("type: " + json.StringOf("type"))
System.DebugLog("message: " + json.StringOf("message"))
System.DebugLog("id: " + json.StringOf("id"))
System.DebugLog("link: " + json.StringOf("link"))
System.DebugLog("privacy descripton: " + json.StringOf("privacy.description"))

Dim dtime As New Chilkat.CkDateTime
Dim bLocalTime As Boolean
bLocalTime = True
success = dtime.SetFromTimestamp(json.StringOf("created_time"))
Dim dt As Chilkat.DtObj
dt = dtime.GetDtObj(bLocalTime)
System.DebugLog(Str(dt.Month) + "/" + Str(dt.Day) + "/" + Str(dt.Year) + "  " + Str(dt.Hour) + ":" + Str(dt.Minute))