half-attempt at using the MobileDevice framework with NodObjC

mobiledevice.js

var $ = require('NodObjC')
  , ffi = require('node-ffi')

$.import('MobileDevice')

function callback (info, foo) {
  console.log('inside callback!')
}

// Get a function pointer to the callback function above
var cb = new ffi.Callback([ 'void', ['pointer', 'pointer']], callback)
  , cb_ptr = cb.getPointer()

// Define am_device_notification
var am_device_notification = ffi.Struct([
    ['unknown0', 'uint32']
  , ['unknown1', 'uint32']
  , ['unknown2', 'uint32']
  , ['callback', 'pointer']
  , ['unknown3', 'uint32']
])

// create an instance of am_device_notification
var notif = new am_device_notification()
notif.unknown0 = 0 // <- idk what's supposed to go in these

$.AMDeviceNotificationSubscribe(cb, 0, 0, null, notif.ref());