Question

Ruby的新手，以及一般的编程。

我正在尝试写入文件，然后将我写入的内容打印到终端中的文件中。

filename = ARGV.first
script = $0

puts "Would you like to read the file?"
puts "If you want to, hit RETURN."
puts "If you don't want to, hit CTRL+C."

prompt = "? "
STDIN.gets

puts "Opening file..."
target = File.open(filename, 'w+')

puts "Reading file..."
puts target.read()

puts "Blank, huh?"

print "Write something: "; line1 = STDIN.gets()
print "A little more: "; line2 = STDIN.gets()

target.write(line1)
target.write(line2)

puts "Let's read it now."
puts target.read()

代码一直运行，直到我到达最后一行，此时抛出以下错误：

exl16_2.rb:26:in `read': can't convert String into Integer (TypeError)
    from exl16_2.rb:26:in `<main>'

不确定这意味着在我想要做的事情的背景下（打印出写的内容）。

Answer 1

不确定是什么导致了您的错误，您使用的是什么Ruby版本？我试过w / 1.9和2.1并没有得到它。但是您的代码存在问题，请尝试以下方法：

filename = ARGV.first
script = $0

puts "Would you like to read the file?"
puts "If you want to, hit RETURN."
puts "If you don't want to, hit CTRL+C."

prompt = "? "
STDIN.gets

puts "Opening file..."
target = File.open(filename, 'w+')

puts "Reading file..."
puts target.read()

puts "Blank, huh?"

print "Write something: "; line1 = STDIN.gets()
print "A little more: "; line2 = STDIN.gets()

target.write(line1)
target.write(line2)
target.rewind()

puts "Let's read it now."
puts target.read()

如果您在编写后从文件中读取，它将显示为空。 rewind调用将确保您从文件的开头读取。

Ruby - 'read'：无法将String转换为Integer

1 个答案: