Question

I’m working on a project that uses both .net and java, using zeromq to communicate between them.

I can connect to the .net server, however when I try to convert the byte array to a string strange things happen. In the eclipse debugger I can see the string, and its length. When I click on the string its value changes to being only the first letter, and the length changes to 1. In the eclipse console when I try to copy and paste the output I only get the first letter. I also tried running it in NetBeans and get the same issue.

I thought it might be due to Endianness, so have tired both
BIG_ENDIAN
LITTLE_ENDIAN

Anyone know how I an get the full string, and not just the first letter?

import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import org.zeromq.ZMQ;

class local_thr
{
private static final String ENDPOINT = "tcp://127.0.0.1:8000";
static String[]  myargs={ENDPOINT, "1000", "100"};  
  public static void main (String [] args)  {

  args = myargs;     

  ZMQ.Context ctx = ZMQ.context (1);
  ZMQ.Socket s = ctx.socket (ZMQ.SUB);

  s.subscribe("".getBytes());
  s.connect (ENDPOINT);

  while(true){
      byte [] data = s.recv (0);


     ByteBuffer buf = ByteBuffer.wrap(data);
      buf.order(ByteOrder.nativeOrder());

      byte[] bytes = new byte[buf.remaining()];
      buf.get(bytes, 0, bytes.length);

          String quote;
          quote = new String(bytes);

          String myQuote;
          myQuote = new String();
          System.out.println (quote);
    }
  }
 }

Answer 1

1 char suggests that the data is being encoded as little-endian UTF-16 and decoded as nul-terminated (could be expecting single-byte, could be expecting UTF-8).

Make sure you are familiar with encodings, and ensure that both ends of the pipe are using the same encoding.

The java string(byte[]) constructor uses the default system charset; I would start by investigating how to read UTF-16 from java. Or maybe use UTF-8 from both ends. Using a default charset is never robust.