From: w_a_x_man <w_a_x_man@...>
Date: 2010-11-29T12:30:18+09:00
Subject: Re: Loading variables from a file [Noob Question]

On Nov 28, 11:44 am, Richard Mccormack <br...@livingwiththehorde.com>
wrote:
> Hey everyone,
> I've been working on some sort of a test-based game to learn ruby (and
> programming in general :) and I got stuck with my saving/loading system.
> To show you what I mean, this is what I used to save the game. (I want
> the code to be as modular as I can, I have some sort of an addon system
> planned...)
>
> def savegame(name, varstosave)
>   savegame = File.new(name + ".tsl", "w")
>      savegame.puts varstosave.to_s
>      while varstosave.length != 0
>         savegame.puts varstosave[0]
>         savegame.puts eval(varstosave[0]).to_s
>         varstosave.delete_at(0)
>      end
>   savegame.close
> end
>
> So, now I am trying to to load the variables from the file. I came up
> with the start of a function:
>
> def loadgame(name, varstoload)
>   puts "Loading..."
>   loadgame = File.open(name + ".tsl", "r")
>     while varstoload.length != 0
>         # ?
>     end
>   loadgame.close
> end
>
> Where varstoload/varstosave is an array. Problem with the loading is
> that I assumed there  was a way to take the first variable name from the
> array and actually use it as a variable. So, if the array is
> ["$intellect", "$strength"], I thought I would be able somehow to turn
> a[0] into a variable object. It seems that there isn't a way to do this,
> so I was wondering if there was a better way to manage the
> saving/loading.

Use a hash (associative array).


def save_game( name, hash )
  open( name + ".tsl", "w" ){|f|
    f.puts hash.to_a.join( "\n" )
  }
end

def load_game( name )
  hash = {}
  open( name + ".tsl", "r" ){|f|
    while key = f.gets
      hash[ key.strip ] = f.gets.to_i
    end
  }
  hash
end

status = {}
status[ 'intellect' ] = 140
status[ 'strength' ] = 120

save_game( 'foo', status )
p load_game( 'foo' )