read_to_string in std::fs - Rust
Description: Reads the entire contents of a file into a string.

## read_to_string

# Function read_to_string

1.26.0 · Source

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

Expand description

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(())
    }