Marshal.dump?

S.Vinothkumar · #1 (**permalink**) 10-12-2007, 11:19 PM

how do you use marshal.dump in Ruby please?

mobilegeek · #2 (**permalink**) 10-22-2007, 02:33 AM

Hi,

Marshal.dump to save a serialized version of it to the disk.

Java features the ability to serialize objects, letting you store them somewhere and reconstitute them when needed. Ruby calls this kind of serialization marshaling.

We will write a basic class myrub.rb just for testing marshalling.

Code:

class GameCharacter

  def initialize(power, type, weapons)

    @power = power

    @type = type

    @weapons = weapons

  end

    attr_reader :power, :type, :weapons

end

The program myrubdump.rb creates an object of the above class and then uses Marshal.dump to save a serialized version of it to the disk.

Code:

require 'myrub.rb'

gc = GameCharacter.new(120, 'Magician', ['spells', 'invisibility'])

puts gc.power.to_s + ' ' + gc.type + ' '

gc.weapons.each do |w|

  puts w + ' '

end

 

File.open('game', 'w+') do |f|

  Marshal.dump(gc, f)

end

The program myrubload.rb uses Marshal.load to read it in.

Code:

require 'myrub.rb'

File.open('game') do |f|

      @gc = Marshal.load(f)

end

 

puts @gc.power.to_s + ' ' + @gc.type + ' '

@gc.weapons.each do |w|

  puts w + ' '

end

S.Vinothkumar · #3 (**permalink**) 11-28-2007, 01:19 AM

Ya…thnx for your reply mobile…

But I have some doubts in your coding…

You said in your coding…

Code:

File.open('game', 'w+') do |f|

What does the string

Code:

'w+'

do and

Code:

|f|

do please?

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