title: iPhone - NSError reference : constants and code
body: <p>I'm searching some precise doc where I can associate an error number to its constant. Let's say, for example, I'm searching the constant of NSError.code = 102. How may I do to find it ? Searching the Web does not help. Searching the headers file is a headache.</p>
  
  <p>How would you do this ?</p>