Re: Java Socket Communication: Works under windows, times out under Linux and Mac OS

From:

Nigel Wade <nmw@ion.le.ac.uk>

Newsgroups:

comp.lang.java.help

Date:

Fri, 13 Mar 2009 09:22:19 +0000

Message-ID:

<gpd8kb$28i$1@south.jnrs.ja.net>

Stetson wrote:

Found the source of this 'initiation' character in the manufacturer's
code:

              //?????????b???Z???[???W??????
              String msg = String.valueOf((char)0x05);
              msg += device + data;
              msg = addBcc(msg);

              //?????????b???Z???[???W?????????M
              send(msg);

I think that 'String.valueOf((char)0x05); is being interpreted
differently in different OSes, but I don't know why that would be.

If what you are sending is essential binary I don't think you should use
Writer/Readers. They are for I/O of encoded character strings. Use a Stream
instead (for both reading and writing).

The reason the behaviour varies between OS could be due to differing default
character encodings. It may well be that what you think you are sending to the
server is not what is actually emerging from the Writer.

If you want to see what's going out on the wire, and what is returned, try
installing WireShark. It's about the best software network diagnostic tool you
can get for free.

--
Nigel Wade