# Function read

1.26.0 · Source

    pub fn read<P: AsRef<Path>>(path: P) -> Result<Vec<u8>>

Expand description

Reads the entire contents of a file into a bytes vector.

This is a convenience function for using `File::open` and `read_to_end` 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`.

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

## §Examples

    use std::fs;

    fn main() -> Result<(), Box<dyn std::error::Error + 'static>> {
        let data: Vec<u8> = fs::read("image.jpg")?;
        assert_eq!(data[0..3], [0xFF, 0xD8, 0xFF]);
        Ok(())
    }