From: Brian Candler <b.candler@...>
Date: 2010-07-16T01:32:45+09:00
Subject: Re: Sending packets over TCP server

Zsdfhdfgasdf Gsfgsdgsdgsd wrote:
> I'm making a TCP server in Ruby, and I still haven't figured out how I
> can send packets the way it should be sent. I know how to receive
> packets and such though...
> 
> For example, one of the packets I need to send looks like this:
> 
> Packet ID: 0x00
> Purpose: Server Identification: Response to a joining player. The user
> type indicates whether a player is an operator (0x64) or not (0x00.)
> Current protocol version is 0x07.
> 
> Fields:
> Packet ID    Byte
> Protocol Version  Byte
> Server name    String
> Server MOTD    String
> User Type    Byte

You need more detail than that. Is a string of a fixed size, or 
terminated by a null, or prefixed by a length byte, or something else?

You can send raw data just by sticking the bytes a string, like this:

  client.write "\x00\x07foobar\x00baz\x07"

For building such strings, Array#pack and String#unpack are going to be 
what you're looking for.

>> [0,7,"foobar","baz",100].pack("CCZ*Z*C")
=> "\000\afoobar\000baz\000d"
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