Function std::fs::read_to_string1.26.0[][src]

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

Read 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. It pre-allocates a buffer based on the file size when available, so it is generally faster than reading into a string created with String::new().


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

It will also return an error if it encounters while reading an error of a kind other than io::ErrorKind::Interrupted, or if the contents of the file are not valid UTF-8.


use std::fs;
use std::net::SocketAddr;
use std::error::Error;

fn main() -> Result<(), Box<dyn Error>> {
    let foo: SocketAddr = fs::read_to_string("address.txt")?.parse()?;