title: How to convert NSArray to NSData?
body: <p>Can anyone tell me how to convert an <code>NSArray</code> to an <code>NSData</code>? I have an <code>NSArray</code>. I need to send it to an <code>NSInputStream</code>. In order to do that I need to convert the <code>NSArray</code> to an <code>NSData</code>. </p>
  
  <p>Please help me, I'm stuck here.</p>