title: unsigned char in Swift
body: <p>In Obj-C this code is used to convert an NSData to unsigned char:</p>
  
  <pre><code>unsigned char *dataToSentToPrinter = (unsigned char *)malloc(commandSize);
  </code></pre>
  
  <p>In Swift unsigned char is supposedly called CUnsignedChar, but how do i convert an NSData object to CUnsignedChar in Swift?</p>