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DatagramPacket.getData() weirdness

 
Alex Kirk
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While working with a Datagram-based application, I've noticed what looks like a quirk in the getData() method for DatagramPackets. I'd been having all kinds of troubles comparing a byte array I'd created from a String to the byte array coming from an inbound DatagramPacket, where I knew exactly what the DatagramPacket should contain. When I looked a little closer, I found that although the printed Strings seemed equal, the byte array coming in was actually one byte longer, containing an odd little character at the end.
Basically, when I looked at this character -- either as System.out.println(array[9]), Byte.toString(), or Byte.intValue() -- it showed up as a "0". I figured I could solve my comparison problem by adding a "0" to the end of my home-grown String; when that didn't do it, I figured it was a null character, or "\0", and tried that. Neither worked.
Just to confound the issue further, when a String is created from the byte array generated from DatagramPacket.getData(), this last character doesn't print.
Any ideas what this character might be, and why it's there? Is this a problem with getData(), or something going on with the program sending me my DatagramPacket?
Thanks,
Alex Kirk
 
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