From: "Berger, Daniel" <djberge@...>
Date: 2002-08-15T00:51:43+09:00
Subject: RE: Problems with Marshal

> -----Original Message-----
> From: Hugh Sasse Staff Elec Eng [mailto:hgs@dmu.ac.uk]
> 
> On Wed, 14 Aug 2002, Daniel Berger wrote:
> 
> > "incompatible marshal file format (can't be read) (TypeError)"
> 
> How are you sending and receiving the data?

Ok, I've narrowed it down partially to a newline issue with Marshal.  Here
are a sample client and server to demonstrate.  Just start the server in one
terminal and the client in another.  Uncomment the appropriate lines to view
the different behavior.  More comments at end...

# SAMPLE SERVER

require 'socket'
a = ["one","two","three"]    # -> This gets wonky results
#a = ["one","two","three\n"] # -> This works
#a.push("\n")                # -> This causes "marshal data too short"
x = Marshal.dump(a)

tcpServer = TCPServer.open('localhost',8877)
$tcpServer = tcpServer

addr = tcpServer.addr
addr.shift # remove "AF_INET"

#puts "Server is on port: " + addr.shift.to_s

while true
   Thread.start(tcpServer.accept) do |s|
      puts "Accepted connection: #{s}"
      r = s.gets
      puts "Got #{r} from client"
      s.puts(x)
      s.close
   end
end

# SAMPLE CLIENT

require 'socket'

s = TCPSocket.open('localhost',8877)

s.puts("hello") # send whatever
v = s.gets

a = Marshal.load(v)
a.each do |x|
   puts x
end
s.close


# more comments

The question I have, then, is how do I make sure that the marshalled object
is properly newline terminated?

Regards,

Dan