在Ruby中使用Marshal :: dump进行对象序列化时如何写入文件 [英] How to write to file when using Marshal::dump in Ruby for object serialization

问题描述

假设我有 Line 类的对象 line :

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:

How can I binary serialize the line object? I tried with:

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

但是它创建了文件并且没有添加任何东西.我读了《课堂:IO文档》，但我真的听不懂.

but it created file and didn't add anything. I read the Class: IO documentation but I couldn't really get it.

推荐答案

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]

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