如何在Erlang中读取文件中的单行

Question

我是Erlang和stackoverflow的新手。我一直在搜索关于如何使用Erlang从.txt文件中读取字符串的线程。我还希望使用string:tokens将其分成单词我已被告知我可以使用io：get_line来完成此操作，但我必须做错事。这是我写的代码。任何指导将不胜感激！

-module(lab6).
-export([file/1]).

file(fName) ->
file:open(fName, [read]),
string:tokens(io:get_line(fName), ". ").

Answer 1

-module(lab6).
-export([file/1]).

file(FName) ->  % a variable must start by an Upper case character, otherwise it is an atom
    {ok,IoDevice} = file:open(FName, [read]), % file:open/2 returns the tuple {ok,IoDevice} if it succeeds.
                                              % IoDevice is the file descriptor you will use for further accesses
    string:tokens(io:get_line(IoDevice,""), ". "). % you must use the file descriptor to read a new line, get_line
                                               % is expecting 2 arguments, the second one is a prompt, not used here
                                               % this code will split the first line of the file FName using
                                               % the dot and the white space as separators. It will then returns
                                               % the results letting the file open, but with the file descriptor
                                               % lost! so no chance to continue to read the lines like this.

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