Function read_to_string 

pub fn read_to_string<P: AsRef<Path>>(path: P) -> Result<String>

Reads the entire contents of a file into a string.

This is a convenience function for using File::open and read_to_string with fewer imports and without an intermediate variable.

Errors

This function will return an error if path does not already exist. Other errors may also be returned according to OpenOptions::open.

If the contents of the file are not valid UTF-8, then an error will also be returned.

While reading from the file, this function handles io::ErrorKind::Interrupted with automatic retries. See io::Read documentation for details.

Examples

use std::fs;
use std::error::Error;

fn main() -> Result<(), Box<dyn Error>> {
    let message: String = fs::read_to_string("message.txt")?;
    println!("{}", message);
    Ok(())
}