From: Brian Candler <b.candler@...>
Date: 2010-07-14T06:01:37+09:00
Subject: Re: Programming TCP-protocol Server (MineCraft)

Zsdfhdfgasdf Gsfgsdgsdgsd wrote:
> What I want to do is to create a custom Minecraft Server in Ruby.

If your server wants to accept incoming TCP connections from clients, 
then you can use TCPServer and Socket#accept. gserver.rb in the standard 
library wraps this all up for you. Read the source code for 
documentation. It's likely installed in your system somewhere like 
/usr/lib/ruby/1.8/gserver.rb

See also the chapter "Network and Web Libraries" in Programming Ruby:
http://www.ruby-doc.org/docs/ProgrammingRuby/

> But the crucial thing I DON'T know is how to SEND TCP packets and DECODE
> them after receiving them. May someone give me a pointer?

Once you've got an open socket, you can just use gets() or read(n) to 
get data (the first reads up to a newline, the second reads n bytes), 
and puts() or write() to send data.

Note that each client will be handled in a separate thread, which means 
you may need to be careful about thread-safety if you are working with a 
shared data structure.

HTH,

Brian.
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