如何捕获传输到Rust程序的进程的输出？

BufRead::lines在标准输入的锁定句柄上使用:

use std::io::{self, BufRead};

fn main() {
    let stdin = io::stdin();
    for line in stdin.lock().lines() {
        let line = line.expect("Could not read line from standard in");
        println!("{}", line);
    }
}

如果你想重用它的分配String,你可以使用循环形式:

use std::io::{self, Read};

fn main() {
    let stdin = io::stdin();
    let mut stdin = stdin.lock(); // locking is optional

    let mut line = String::new();

    // Could also `match` on the `Result` if you wanted to handle `Err` 
    while let Ok(n_bytes) = stdin.read_to_string(&mut line) {
        if n_bytes == 0 { break }
        println!("{}", line);
        line.clear();
    }
}