如何从标准输入读取单个字符串? [英] How do I read a single String from standard input?
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问题描述
std::io 文档,但我认为这应该可行:
There isn't straightforward instruction on receiving a string as a variable in the std::io documentation, but I figured this should work:
use std::io;
let line = io::stdin().lock().lines().unwrap();
但我收到此错误:
src\main.rs:28:14: 28:23 error: unresolved name `io::stdin`
src\main.rs:28 let line = io::stdin.lock().lines().unwrap();
^~~~~~~~~
为什么?
我使用的是夜间 Rust v1.0.
I'm using a nightly Rust v1.0.
推荐答案
以下是执行您正在尝试的操作所需的代码(不评论是否是一个好的方法:
Here's the code you need to do what you are trying (no comments on if it is a good way to go about it:
use std::io::{self, BufRead};
fn main() {
let stdin = io::stdin();
let line = stdin.lock()
.lines()
.next()
.expect("there was no next line")
.expect("the line could not be read");
}
如果您想更好地控制读取行的位置,可以使用 Stdin::read_line
.这接受要附加到的 &mut String
.有了这个,你可以确保字符串有足够大的缓冲区,或者附加到现有的字符串:
If you want more control over where the line is read to, you can use Stdin::read_line
. This accepts a &mut String
to append to. With this, you can ensure that the string has a large enough buffer, or append to an existing string:
use std::io::{self, BufRead};
fn main() {
let mut line = String::new();
let stdin = io::stdin();
stdin.lock().read_line(&mut line).expect("Could not read line");
println!("{}", line)
}
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