title: iphone: NSDATA dataWithContentsOfURL returning null
body: <p>I have a problem  of getting NSData via <code>[NSData dataWithContentsOfURL: url]</code> and giving me an null object where the url is the NSURL got it from <code>defaultRepresentation</code> of the asset.. The url in the NSURL is : </p>
  
  <blockquote>
    <p>assets-library://asset/asset.JPG?id=1000000366&amp;ext=JPG</p>
  </blockquote>
  
  <p>I went to other forum, they talked about something like file url... Do I have to convert the url to file path ? </p>
  
  <p>But i can have the thumbnail of the ALAsset on a view.</p>
  
  <p>Does anyone know why i get null NSData object?</p>