Ruby：如何在腳本中調用文件後關閉文件

Question

使用下面的腳本，close（）語法的位置在哪裏，它會是什麼？

print "Enter the filename you want to open here > " 
filename = $stdin.gets.chomp 
txt = open(filename) 

puts "Here's your file #{filename}" 
print txt.read 
print "Type the filename again: " 

file_again = $stdin.gets.chomp 
txt_again = open(file_again) 

print txt_again.read 

Answer 1

一個具有兩種能力：顯式調用IO#closeensure塊內或使用IO#read/open塊版本：

filename = $stdin.gets.chomp 
begin 
    txt = open(filename) 
    puts "Here's your file #{filename}" 
    print txt.read 
ensure 
    txt.close 
end 


filename = $stdin.gets.chomp 
open(filename) do |txt| 
    puts "Here's your file #{filename}" 
    print txt.read 
end 

Answer 2

可以使用close方法，在您的上下文：txt.close

但我建議你使用塊，所以你的代碼會更好

像這樣的事情

File.open(filename) do |txt| 
    ... 
    print txt.read 
    ... 
end