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(Ruby) Paging User Photos with Cursor

Demonstrates how to iterate over the pages of user photos using a cursor.

Chilkat Ruby Downloads

Ruby Library for Linux and MAC OS X

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
oauth2 = Chilkat::CkOAuth2.new()
oauth2.put_AccessToken("FACEBOOK-ACCESS-TOKEN")

rest = Chilkat::CkRest.new()

# Connect to Facebook.
success = rest.Connect("graph.facebook.com",443,true,true)
if (success != true)
    print rest.lastErrorText() + "\n";
    exit
end

# Provide the authentication credentials (i.e. the access key)
rest.SetAuthOAuth2(oauth2)

# Indicate that we only want the photos the user has personally uploaded.
rest.AddQueryParam("type","uploaded")

# We could limit the number of photos per page using the "limit" field.
rest.AddQueryParam("limit","20")

# Get the 1st page of photos. (Not the actual image data, but the information about each photo.)
# See https://developers.facebook.com/docs/graph-api/reference/user/photos/ for more information.
responseJson = rest.fullRequestNoBody("GET","/v2.7/me/photos")
if (rest.get_LastMethodSuccess() != true)
    print rest.lastErrorText() + "\n";
    exit
end

json = Chilkat::CkJsonObject.new()
json.put_EmitCompact(false)
json.Load(responseJson)
print json.emit() + "\n";

# 
# See Parsing the Facebook User Photos for code showing how to parse the JSON photos content.
# 

# Get the "after" cursor.
afterCursor = json.stringOf("paging.cursors.after")
while json.get_LastMethodSuccess() == true

    print "after cursor: " + afterCursor + "\n";

    # Prepare for getting the next page of photos.
    # We can continue using the same REST object.
    # If already connected, we'll continue using the existing connection.
    # Otherwise, a new connection will automatically be made if needed.
    rest.ClearAllQueryParams()
    rest.AddQueryParam("type","uploaded")
    rest.AddQueryParam("limit","20")
    rest.AddQueryParam("after",afterCursor)

    responseJson = rest.fullRequestNoBody("GET","/v2.7/me/photos")
    if (rest.get_LastMethodSuccess() != true)
        print rest.lastErrorText() + "\n";
        exit
    end

    json.Load(responseJson)
    # See Parsing the Facebook User Photos for code showing how to parse the JSON photos content.

    print json.emit() + "\n";

    # Get the cursor for the next page.
    afterCursor = json.stringOf("paging.cursors.after")
end

print "No more pages of photos." + "\n";

 

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