class String
  BTOW = Win32API.new("Kernel32", "MultiByteToWideChar", %w(i i p i p i), "i")
  WTOB = Win32API.new("Kernel32", "WideCharToMultiByte", %w(i i p i p i p i), "i")
  attr_reader :type
  alias :base_initialize :initialize
  def initialize
    base_initialize
    @type = 65001
  end
  def conv(type)
    l = self.size * 2
    baffa = "\0" * l
    result = "\0" * l
    BTOW.call(@type, 0, self, -1, baffa, l)
    case type
    when "utf8"
      @type = 65001
    when "szis"
      @type = 0
    when "utf7"
      @type = 65000
    when "uni"
      return result.gsub(/\0/){}
    else
      print "それは文字コードではないか、現在対応していません。"
      return
    end
    WTOB.call(@type, 0, baffa, -1, result, l, nil, 0)
    return result.gsub(/\0/){}
  end
  def szis
    l = self.size * 2
    baffa = "\0" * l
    result = "\0" * l
    BTOW.call(65001, 0, self, -1, baffa, l)
    WTOB.call(0, 0, baffa, -1, result, l, nil, 0)
    return result.gsub(/\0/){} 
  end
  def utf8
    l = self.size * 2
    baffa = "\0" * l
    result = "\0" * l
    BTOW.call(0, 0, self, -1, baffa, l)
    WTOB.call(65001, 0, baffa, -1, result, l, nil, 0)
    return result.gsub(/\0/){}
  end
end