I need following functionality 1. User logged in on a website. 2. Program determines whether user logged in or not. 3. If user logged in, then the program fetch pictures from iPhone (photos folder) and upload them on the website. The point which I cannot understand is that how to detect that user logged in or not. Is there any Joomla framework which allows me to do this? And can I use Joomla API with Objective C?