[ns] Fwd: Traffictrace format problems

[Ebonie Wiliams]

---------- Forwarded message ----------
From: Ebonie Wiliams <enwillia at gmail.com>
Date: Fri, Feb 29, 2008 at 10:57 AM
Subject: Traffictrace format problems
To: ns-users at isi.edu


Here is my problem:

I am trying to create network traffic using a traffictrace application and
file.  I know that the file must be in binary format with two 32bit fields
(the first field in microseconds for interpacket transfer time, and the next
in bytes for packet size).  I have a java program that generates the packets
and writes them to file in binary string format (tobinaryString() : Integer
class).  I used the BufferedWriter and FileWriter to write the output.
Then, I convert the output to binary using ascii2binary (a command-line
linux program).  Every time I look at my output changed to binary, there is
barely any output written to it.  I have done this many times.  First few
times, I simply had my java program write the fields without expressing them
as a binary string (tobinaryString()).  At first I would get this error
"read failed" and NS would run my tcl script without generating any packets
for the node that with the traffictrace application.  I know that this means
that NS thinks my file has no elements or is null.  Now since I use
ascii2binary, I don't get that anymore.  Before using ascii2binary, I just
had java's toBinaryString().

I have tried using the example-trace file included in the source code.  It
works, and when I look at its fields (I used ascii2binary's binary2ascii
command), there is a lot of output in the file.  My output files barely have
anything written in them.  My output files look fine in ascii format,
though.

I have tried to use the hack to ns that allows for ascii traffictrace
files.  I found this on the ns-users mailing list.  It didn't work, so I am
not using it anymore.

My question is that I don't know how to create a traffictrace file that is
successfully read by NS.
Should I use another method to write to my output in java (BufferedWriter,
FileWriter)?  Should I use another language?  I appreciate your feedback,
thanks.