IO Traits

Traits สำหรับ input/output operations

Read Trait

use std::io::{Read, Cursor};

fn main() {
    let data = b"Hello, World!";
    let mut cursor = Cursor::new(data);

    // read - fill buffer
    let mut buf = [0u8; 5];
    let n = cursor.read(&mut buf).unwrap();
    println!("Read {} bytes: {:?}", n, String::from_utf8_lossy(&buf));

    // read_exact - must fill exactly
    cursor.set_position(0);
    let mut buf = [0u8; 5];
    cursor.read_exact(&mut buf).unwrap();
    println!("Exact: {:?}", String::from_utf8_lossy(&buf));

    // read_to_end - read all to Vec
    cursor.set_position(0);
    let mut vec = Vec::new();
    cursor.read_to_end(&mut vec).unwrap();
    println!("All bytes: {:?}", vec);

    // read_to_string - read all as String
    cursor.set_position(0);
    let mut s = String::new();
    cursor.read_to_string(&mut s).unwrap();
    println!("String: {}", s);

    // bytes() iterator
    cursor.set_position(0);
    println!("\nBytes:");
    for byte in cursor.bytes().take(5) {
        print!("{:02x} ", byte.unwrap());
    }
    println!();
}