(Tcl) 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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load ./chilkat.dll

# 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
set oauth2 [new_CkOAuth2]

CkOAuth2_put_AccessToken $oauth2 "FACEBOOK-ACCESS-TOKEN"

set rest [new_CkRest]

# Connect to Facebook...
set success [CkRest_Connect $rest "graph.facebook.com" 443 1 1]
if {$success != 1} then {
    puts [CkRest_lastErrorText $rest]
    delete_CkOAuth2 $oauth2
    delete_CkRest $rest
    exit
}

# Provide the authentication credentials (i.e. the access key)
CkRest_SetAuthOAuth2 $rest $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.

set postId "10224048320139890_10210156138515282"

set sbPath [new_CkStringBuilder]

CkStringBuilder_Append $sbPath "/v2.7/"
CkStringBuilder_Append $sbPath $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/
CkRest_AddQueryParam $rest "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"

set responseJson [CkRest_fullRequestNoBody $rest "GET" [CkStringBuilder_getAsString $sbPath]]
if {[CkRest_get_LastMethodSuccess $rest] != 1} then {
    puts [CkRest_lastErrorText $rest]
    delete_CkOAuth2 $oauth2
    delete_CkRest $rest
    delete_CkStringBuilder $sbPath
    exit
}

set json [new_CkJsonObject]

CkJsonObject_put_EmitCompact $json 0
CkJsonObject_Load $json $responseJson

# Show the JSON in human-readable format.
puts [CkJsonObject_emit $json]

# 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.
puts "type: [CkJsonObject_stringOf $json type]"
puts "message: [CkJsonObject_stringOf $json message]"
puts "id: [CkJsonObject_stringOf $json id]"
puts "link: [CkJsonObject_stringOf $json link]"
puts "privacy descripton: [CkJsonObject_stringOf $json privacy.description]"

set dtime [new_CkDateTime]

set bLocalTime 1
CkDateTime_SetFromTimestamp $dtime [CkJsonObject_stringOf $json "created_time"]
# dt is a CkDtObj
set dt [CkDateTime_GetDtObj $dtime $bLocalTime]
puts [CkDtObj_get_Month $dt]/[CkDtObj_get_Day $dt]/[CkDtObj_get_Year $dt]  [CkDtObj_get_Hour $dt]:[CkDtObj_get_Minute $dt]
delete_CkDtObj $dt


delete_CkOAuth2 $oauth2
delete_CkRest $rest
delete_CkStringBuilder $sbPath
delete_CkJsonObject $json
delete_CkDateTime $dtime