Category: rust

use std::fs::OpenOptions;
use std::io::prelude::*;
use std::path::Path;

fn main() -> std::io::Result<()> {
    let file_path = Path::new("hello.txt");
    
    let mut file = OpenOptions::new()
        .create(true)
        .append(true)
        .open(file_path)?;
        
    file.write_all(b"Hello, World!\n")?;
    
    println!("成功追加内容到文件: {}", file_path.display());
    Ok(())
}

创建文件并且写入

fn read() -> Result<(), Box<dyn Error>> {
    let file_path = Path::new("hello.txt");
    
    match File::open(file_path) {
        Ok(mut file) => {
            let mut contents = String::new();
            file.read_to_string(&mut contents)?;
            println!("文件内容:\n{}", contents);
        }
        Err(e) => eprintln!("无法打开文件: {}", e),
    }
    
    Ok(())
}

读取文件