如何从OCaml的文本文件中读取行? [英] How do I read in lines from a text file in OCaml?

问题描述

这是我到目前为止所拥有的.这不是您所需要的吗?我不断收到错误错误:未绑定模块标准"

This is what I have so far. Isn't this all that you need? I keep getting the error "Error: Unbound module Std"

let r file =
    let chan = open_in file in
    Std.input_list (chan)

推荐答案

如果您没有 Extlib 已安装(显然您不是基于上面的错误消息)，然后通常会执行以下操作:

If you don't have Extlib installed (and apparently you don't based on the error message above), then generally it's done something like this:

let read_file filename = 
let lines = ref [] in
let chan = open_in filename in
try
  while true; do
    lines := input_line chan :: !lines
  done; !lines
with End_of_file ->
  close_in chan;
  List.rev !lines ;;

如果您有Extlib:

If you do have Extlib:

let read_file filename =
  let chan = open_in filename in
  Std.input_list chan

...这几乎就是您所拥有的.

...which is pretty much what you have.

如果您有包含电池的库，则可以将文件读取到Enum.t中，然后对其进行如下迭代:

If you have the Batteries-included library you could read a file into an Enum.t and iterate over it as follows:

let filelines = File.lines_of filename in
Enum.iter ( fun line -> (*Do something with line here*) ) filelines

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