在Rust中写入子进程的stdin吗? [英] Write to child process' stdin in Rust?

问题描述

Rust的 std :: process :: Command 允许通过 stdin 方法，但该方法似乎只接受现有文件或管道.

Rust's std::process::Command allows configuring the process' stdin via the stdin method, but it appears that that method only accepts existing files or pipes.

给出一片字节，如何将其写入 Command 的标准输入?

Given a slice of bytes, how would you go about writing it to the stdin of a Command?

推荐答案

您可以创建一个stdin管道并在其上写入字节.

You can create a stdin pipe and write the bytes on it.

• 当 Command :: output 立即关闭标准输入时，您必须使用 Command :: spawn .
• Command :: spawn 默认情况下继承stdin.您必须使用 Command :: stdin 更改行为.

• As Command::output immediately closes the stdin, you'll have to use Command::spawn.
• Command::spawn inherits stdin by default. You'll have to use Command::stdin to change the behavior.

以下是示例(操场):

use std::io::{self, Write};
use std::process::{Command, Stdio};

fn main() -> io::Result<()> {
    let mut child = Command::new("cat")
        .stdin(Stdio::piped())
        .stdout(Stdio::piped())
        .spawn()?;

    let child_stdin = child.stdin.as_mut().unwrap();
    child_stdin.write_all(b"Hello, world!\n")?;
    // Close stdin to finish and avoid indefinite blocking
    drop(child_stdin);
    
    let output = child.wait_with_output()?;

    println!("output = {:?}", output);

    Ok(())
}

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