Working with files

Now we show you how to do common operations with files, such as reading and writing, and making folders, and at the same time do proper error handling. The modules that contain these functionalities are std::path, which provides for cross platform file path manipulation, and std::fs.

Paths

File paths from the underlying file system are represented by the Path struct, which is created from a string slice containing the full path with Path::new. Suppose hello.txt is an existing file in the current directory; let's write some code to explore it:

// code from Chapter 11/code/paths.rs:use std::path::Path; 
 
fn main() { 
    let path = Path::new("hello.txt"); 
 let display = path.display(); 
     
    // test whether path exists: 
    if path.exists() { 
        println!("{} exists", display); 
    } 
    else { 
        panic!("This path or file does not exist!"); 
    } 
 
    let file = path.file_name().unwrap();
let extension = path.extension().unwrap();
let parent_dir = path...