关于rust:rust学习读取文件第一次使用lib文件

第一步：cargo new minigrep 创立一个miigrep初始化我的项目

第二步：编辑lib.rs文件：

use std::fs;use std::error::Error;#[derive(Debug)]pub struct Config<'a> {    pub query:  &'a str,    pub filename:  &'a str,}impl Config<'_>{    pub fn parse_config1(args: &[String]) ->  Result<Config, &'static str> {        if args.len() < 3 {            panic!("门路谬误");        }        let query = &args[1];        let filename = &args[2];        Ok(Config { query, filename })    }}pub fn run(config: Config) -> Result<(), Box<dyn Error>>{    let contents = fs::read_to_string(config.filename)?;    println!("With text:\n{}", contents);    Ok(())}

第三步：编辑main.rs文件：

use std::env;use std::process;use minigrep::Config;fn parse_config(args: &[String]) -> Config {    let query = &args[1];    let filename = &args[2];    Config {query, filename}}fn main(){    let args: Vec<String> = env::args().collect();//    let config = parse_config(&args);    let config = Config::parse_config1(&args).unwrap_or_else(|err| {        println!("Problem parsing arguments: {}", err);        process::exit(1);    });;    println!("{:?}", config);    println!("Searching for {}", config.query);    println!("In file {}", config.filename);//    run(config);    if let Err(e) = minigrep::run(config) {        println!("错误信息: {}", e);        process::exit(1);    }//    let text = fs::read_to_string("C:\\Users/kunt/Desktop/rgba.txt").unwrap();//    println!("读取到的文件内容：\n{:?}", text);}

如此就能够读取正确文件名称的文件了：

应用命令： cargo run query_any file_address

D:\learn\minigrep>cargo run as C:\\Users/kunt/Desktop/rgba.txt   Compiling minigrep v0.1.0 (D:\learn\minigrep)warning: unnecessary trailing semicolon  --> src\main.rs:21:8   |21 |     });;   |        ^ help: remove this semicolon   |   = note: `#[warn(redundant_semicolons)]` on by defaultwarning: function is never used: `parse_config` --> src\main.rs:6:4  |6 | fn parse_config(args: &[String]) -> Config {  |    ^^^^^^^^^^^^  |  = note: `#[warn(dead_code)]` on by defaultwarning: 2 warnings emitted    Finished dev [unoptimized + debuginfo] target(s) in 0.57s     Running `target\debug\minigrep.exe as C:\\Users/kunt/Desktop/rgba.txt`Config { query: "as", filename: "C:\\\\Users/kunt/Desktop/rgba.txt" }Searching for asIn file C:\\Users/kunt/Desktop/rgba.txtWith text:插入数据测试