如何匹配特定的io :: Error类型？ [英] How can I match on a specific io::Error type?

问题描述

我试图一次读入一个文件，直到最后2个字节为止，我想捕获EOF错误：

I am trying to read in a file until the end 2 bytes at a time and I want to catch the EOF error:

use byteorder::{BigEndian, ReadBytesExt}; // 1.3.4
use std::fs::File;

fn main() {
    let filename = "/etc/hosts";
    let mut file = File::open(filename).expect("Cannot open file");
    loop {
        let binary = match file.read_u16::<BigEndian>() {
            Ok(binary) => binary,
            Err(e) => panic!("Can't read from file: {}, err {}", filename, e),
            // Can I catch the EOF error here?
        };
        println!("{:?}", binary);
    }
}

推荐答案

此在Rust版本1.17.0中工作（并且可能会回到Rust 1.0）：

This works in Rust version 1.17.0 (and probably back to Rust 1.0):

let binary = match file.read_u16::<BigEndian>() {
    Err(ref e) if e.kind() == std::io::ErrorKind::UnexpectedEof => break,
    Err(e) => panic!("Can't read from file: {}, err {}", filename, e),
    Ok(binary) => binary,
};

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