需要帮助来读取具有特定格式内容的文件 [英] need help to read file with specific formatted contents

问题描述

我正在使用F#.我想解决一些问题，我需要从文件中读取输入，但我不知道该怎么办.文件中的第一行包含三个数字，前两个数字是下一行映射的x和y.示例文件:

i'm using F#. I want to solve some problem that require me to read the input from a file, i don't know what to do. The first line in the file consist of three numbers, the first two numbers is the x and y for an map for the next line. The example file:

5 5 10
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5

5 5 10的意思是下一行具有5x5映射，而10只是一些我需要解决的数字，下一行直到行尾是我必须使用来解决的地图内容10，我想将此地图编号保存为二维数组.有人可以帮助我编写代码以保存文件中的所有数字，以便我可以对其进行处理? *对不起，我的英语不好，希望我的问题能被理解:)

the meaning of 5 5 10 is the next line have 5x5 map and 10 is just some numbers that i need to solve the problem, the next until the end of the line is contents of the map that i have to solve using the 10 and i want to save this map numbers in 2 dimensional array. Someone can help me to write a code to save the all the numbers from the file so i can process it? * Sorry my english is bad, hope my question can be understood :)

我自己的问题的答案: 感谢Daniel和Ankur的回答.为了我自己的目的，我混合了你们俩的代码:

The answer for my own question : Thanks for the answer from Daniel and Ankur. For my own purpose i mix code from both of you:

let readMap2 (path:string) =
    let lines = File.ReadAllLines path
    let [|x; y; n|] = lines.[0].Split() |> Array.map int
    let data = 
        [| 
            for l in (lines |> Array.toSeq |> Seq.skip 1) do
                yield l.Split() |> Array.map int
        |]
    x,y,n,data

非常感谢:D

推荐答案

下面是一些快速而肮脏的代码.它返回标头中最后一个数字的元组(在这种情况下为10)和值的二维数组.

Here's some quick and dirty code. It returns a tuple of the last number in the header (10 in this case) and a two-dimensional array of the values.

open System.IO

let readMap (path:string) =
  use reader = new StreamReader(path)
  match reader.ReadLine() with
  | null -> failwith "empty file"
  | line -> 
    match line.Split() with
    | [|_; _; _|] as hdr -> 
      let [|x; y; n|] = hdr |> Array.map int
      let vals = Array2D.zeroCreate y x
      for i in 0..(y-1) do
        match reader.ReadLine() with
        | null -> failwith "unexpected end of file"
        | line -> 
          let arr = line.Split() |> Array.map int
          if arr.Length <> x then failwith "wrong number of fields"
          else for j in 0..(x-1) do vals.[i, j] <- arr.[j]
      n, vals
    | _ -> failwith "bad header"

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