(Tcl) Get Individual Photo Info

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

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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

# Assumes we've already obtained a Photo ID.
set photoId "10210199026347451"

set sbPath [new_CkStringBuilder]

CkStringBuilder_Append $sbPath "/v2.7/"
CkStringBuilder_Append $sbPath $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/
CkRest_AddQueryParam $rest "fields" "id,album,can_delete,can_tag,from,height,width,images,link,name,name_tags,picture,place,target"

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 response is shown below.
# Demonstrate how to parse values from the JSON.
puts "Album name: [CkJsonObject_stringOf $json album.name]"
set canDelete [CkJsonObject_BoolOf $json "can_delete"]
puts "Can Delete: $canDelete"
puts "From Name: [CkJsonObject_stringOf $json from.name]"
set height [CkJsonObject_IntOf $json "height"]
set width [CkJsonObject_IntOf $json "width"]
puts "Dimensions: $widthx$height"
puts "First Image Source: [CkJsonObject_stringOf $json {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"
# }
# 

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