title: Convert nsdictionary to nsdata
body: <p>have an app that can take a picture and then upload to a server. encoding it to base 64 and pass it thru a XMLRPC to my php server.</p>
  
  <p>i want to take the NSDictionary info that is returned from UIImagePickerController delegate </p>
  
  <pre><code>-(void) imagePickerController:(UIImagePickerController *)imagePicker didFinishPickingMediaWithInfo:(NSDictionary *)info
  </code></pre>
  
  <p>and convert it to NSData so i can encode it.</p>
  
  <p>so, how can i convert NSDictionary to an NSData?</p>