逐行读取文件 [英] Read a file line by line

问题描述

我正在尝试逐行读取文件，但当我到达EOF时我不知道如何停止。

我有这样的代码：

  readWholeFile = do inputFile < -  openFileexample.txtReadMode 
 readALine inputFile 
 
 readALine x = do y<  -  hGetLine x 
 print y 
 readALine x 
  

编辑：确切地说，它总是终止引发异常。

错误消息是：

  ***例外：example.txt：hGetLine：文件结尾
  

解决方案

您正在寻找的是，hIsEOF

查看 http://book.realworldhaskell.org/read/io.html

I'm trying to read a file line by line, but I don't know how to stop when I reach the EOF.

I have this code:

readWholeFile = do inputFile <- openFile "example.txt" ReadMode
                readALine inputFile

readALine x = do y <- hGetLine x
                 print y
                 readALine x

and it obviously always terminata raising an exception.

How can I solve?

Edit: exact error message is:

*** Exception: example.txt: hGetLine: end of file

解决方案

What you are looking for is, hIsEOF

Check out http://book.realworldhaskell.org/read/io.html

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