可以从BinData::Record实例中获取二进制数组

Question

我正在使用Ruby gem Bindata，使用以下代码：

require 'bindata'
class Rectangle < BinData::Record
  endian :little
  uint16 :len
  string :name, :read_length => :len
  uint32 :width
  uint32 :height
end
rectangle = rectangle.new
rectangle.len = 12

可以从rectangle实例中获得类似[0, 1, 1, 0, 0, ...]的数组，该数组具有对象内所有字段的二进制表示？

Answer 1

BinData::Base#to_binary_s返回"此数据对象的字符串表示":

rectangle.to_binary_s
#=> "fx00x00x00x00x00x00x00x00x00"

可以通过String#unpack:将其转换为比特串

rectangle.to_binary_s.unpack('b*')
#=> ["00110000000000000000000000000000000000000000000000000000000000000000000000000000"]

或者通过：连接到位阵列

rectangle.to_binary_s.unpack('b*')[0].chars.map(&:to_i)
#=> [0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]