在 Ruby 中分块读取文件 [英] Read a file in chunks in Ruby

问题描述

我需要以 MB 块读取文件，在 Ruby 中是否有更简洁的方法来执行此操作:

I need to read a file in MB chunks, is there a cleaner way to do this in Ruby:

FILENAME="d:\\tmp\\file.bin"
MEGABYTE = 1024*1024
size = File.size(FILENAME)
open(FILENAME, "rb") do |io| 
  read = 0
  while read < size
    left = (size - read)
    cur = left < MEGABYTE ? left : MEGABYTE
    data = io.read(cur)
    read += data.size
    puts "READ #{cur} bytes" #yield data
  end
end

推荐答案

改编自 Ruby Cookbook page 204:

Adapted from the Ruby Cookbook page 204:

FILENAME = "d:\\tmp\\file.bin"
MEGABYTE = 1024 * 1024

class File
  def each_chunk(chunk_size = MEGABYTE)
    yield read(chunk_size) until eof?
  end
end

open(FILENAME, "rb") do |f|
  f.each_chunk { |chunk| puts chunk }
end

免责声明:我是 ruby​​ 新手，尚未对此进行测试.

Disclaimer: I'm a ruby newbie and haven't tested this.

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