title: NSString get -characters
body: <p>I want to get the characters of an NSString. Like this:</p>
  
  <pre><code>NSString *data;
  const char * typein = [[data characters] UTF8String];
  </code></pre>
  
  <p>But obviously NSString won't respond to -characters. How do I get the characters of NSString?</p>
  
  <p>thanks,
  Elijah</p>