lua - 将文本文件分配给变量

Question

是否可以将文本文件分配给变量并通过调用变量来访问文件？如果是这样，你怎么做？

Answer 1

假设您想从一个函数中这样做。你将会拥有：

function writeToFile(_fileName) -- _fileName being the file you want to write to
        local file = io.open(_fileName, "w")
        file:write("This is a string that will be written to the file")
        file:write("This is a second string")
        file:flush( ) -- save the contents
        file:close( ) -- stop accessing the file
end

如果您只想读取文件，那么您需要做的就是

function readFromFile(_fileName)
    local file = io.open(_fileName, "r")
    for line in file:lines() do
       print(""..line.."\n")
    end
end

Answer 2

使用IO 库

local input = assert(io.open(inputfile, "r"))
local data = f:read("*all")
--do some processing to data
local output = assert(io.open(outfule, "w"))
output:write(data)
input:close()
output:close()

Answer 3

如果您的意思是字面上的“调用变量”，那么试试这个：

local filename="/etc/passwd"
local f=assert(io.open(filename,"r"))
getmetatable(f).__call = f.read

repeat
        local s=f()
        print(s)
until s==nil