在Ruby中使用Marshal :: dump进行对象序列化时如何写入文件

Question

让我说我有类Line的对象行:

class Line
  def initialize point1, point2
    @p1 = point1
    @p2 = point2
  end
end

line = Line.new ...

如何对行对象进行二进制序列化？我尝试过:

data = Marshal::dump(line, "path/to/still/unexisting/file")

但它创建了文件并没有添加任何内容.我阅读了Class:IO文档,但我无法真正理解它.

Answer 1

像这样:

class Line
  attr_reader :p1, :p2
  def initialize point1, point2
    @p1 = point1
    @p2 = point2
  end
end

line = Line.new([1,2], [3,4])

保存line:

FNAME = 'my_file'

File.open(FNAME, 'wb') {|f| f.write(Marshal.dump(line))}

检索到line1:

line1 = Marshal.load(File.binread(FNAME))

确认它有效:

line1.p1 # => [1, 2]