Lua

Get Individual Photo Info

See more Facebook Examples

Assuming we have the ID of a Photo, this example demonstrates how to retrieve the photo information and parse the JSON. Lua

local chilkat = require("chilkat")

-- 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
local oauth2 = chilkat.OAuth2.new()
oauth2.access_token = "FACEBOOK-ACCESS-TOKEN"

local rest = chilkat.Rest.new()

-- Connect to Facebook...
local success = rest:connect("graph.facebook.com", 443, true, true)
if not success then
    print(rest.last_error_text)
    return
end

-- Provide the authentication credentials (i.e. the access key)
rest:set_auth_oauth2(oauth2)

-- Assumes we've already obtained a Photo ID.
local photoId = "10210199026347451"

local sbPath = chilkat.StringBuilder.new()
sbPath:append("/v2.7/")
sbPath:append(photoId)

-- Select the fields we want.
-- This example will select many of the possible fields.
-- See https://developers.facebook.com/docs/graph-api/reference/photo/
rest:add_query_param("fields", "id,album,can_delete,can_tag,from,height,width,images,link,name,name_tags,picture,place,target")

local responseJson = rest:full_request_no_body("GET", sbPath:get_as_string())
if not rest.last_method_success then
    print(rest.last_error_text)
    return
end

local json = chilkat.JsonObject.new()
json.emit_compact = false
json:load(responseJson)

-- Show the JSON in human-readable format.
print(json:emit())

-- A sample response is shown below.
-- Demonstrate how to parse values from the JSON.
print("Album name: " .. json:string_of("album.name"))
local canDelete = json:bool_of("can_delete")
print("Can Delete: " .. tostring(canDelete))
print("From Name: " .. json:string_of("from.name"))
local height = json:int_of("height")
local width = json:int_of("width")
print("Dimensions: " .. width .. "x" .. height)
print("First Image Source: " .. json:string_of("images[0].source"))

-- A sample JSON response is shown here.
-- {
--   "id": "10210199026347451",
--   "album": {
--     "created_time": "2009-10-19T00:06:46+0000",
--     "name": "Timeline Photos",
--     "id": "1237223526054"
--   },
--   "can_delete": true,
--   "can_tag": true,
--   "from": {
--     "name": "Matt Smith",
--     "id": "10224048320139890"
--   },
--   "height": 120,
--   "width": 120,
--   "images": [
--     {
--       "height": 120,
--       "source": "https:\/\/scontent.xx.fbcdn.net\/v\/t1.0-9\/14462791_10210199026347451_7830642117574407060_n.jpg?oh=a7f9ed10cf9cd81a82adeb541c60e2e2&oe=58ABB195",
--       "width": 120
--     }
--   ],
--   "link": "https:\/\/www.facebook.com\/photo.php?fbid=10210199026347451&set=a.1237223526054.2038240.1093202869&type=3",
--   "name": "Ignore my posts -- I'm doing some testing for Facebook related programming...",
--   "picture": "https:\/\/scontent.xx.fbcdn.net\/v\/t1.0-9\/14462791_10210199026347451_7830642117574407060_n.jpg?oh=a7f9ed10cf9cd81a82adeb541c60e2e2&oe=58ABB195"
-- }
--