title: Mac App Sandbox - NSHomeDirectory() issues
body: <p>I just sandboxed my Mac App and in my app I save images in the documents folder. I have this file URL: <code>file:///Users/myUser/Documents/myApp/Images/logo.jpg</code></p>
  
  <p>After my sandbox I end up using NSHomeDirectory() instead of going directly to the Documents folder. The problem with this is that it strips out the <code>file://</code>. Basically, how do I append <code>file://</code> to the URL?</p>
  
  <p>This is what <code>NSHomeDirectory()</code> gives me:</p>
  
  <pre><code>/Users/myUser/Library/Containers/com.company.myApp/Data/myApp/Images/logo.jpg
  </code></pre>
  
  <p>Later on, the user can choose another directory and then I can use the power box, but before the user does that I need to be able to read/write files to the home directory.</p>
  
  <p>Any ideas?</p>