Struct File 

pub struct File { /* private fields */ }

An object providing access to an open file on the filesystem.

Implementations

impl File

pub fn open(path: &str) -> Result<Self>

Attempts to open a file in read-only mode.

pub fn create(path: &str) -> Result<Self>

Opens a file in write-only mode.

pub fn create_new(path: &str) -> Result<Self>

Creates a new file in read-write mode; error if the file exists.

pub fn options() -> OpenOptions

Returns a new OpenOptions object.

pub fn set_len(&self, size: u64) -> Result<()>

Truncates or extends the underlying file, updating the size of this file to become size.

pub fn metadata(&self) -> Result<Metadata>

Queries metadata about the underlying file.

Trait Implementations

impl Read for File

fn read(&mut self, buf: &mut [u8]) -> Result<usize>

Pull some bytes from this source into the specified buffer, returning how many bytes were read.

fn read_exact(&mut self, buf: &mut [u8]) -> Result<(), AxError>

Read the exact number of bytes required to fill buf.

fn read_buf(&mut self, buf: BorrowedCursor<'_>) -> Result<(), AxError>

Pull some bytes from this source into the specified buffer.

fn read_buf_exact(&mut self, cursor: BorrowedCursor<'_>) -> Result<(), AxError>

Reads the exact number of bytes required to fill cursor.

fn read_to_end(&mut self, buf: &mut Vec<u8>) -> Result<usize, AxError>

Read all bytes until EOF in this source, placing them into buf.

fn read_to_string(&mut self, buf: &mut String) -> Result<usize, AxError>

Read all bytes until EOF in this source, appending them to buf.

fn by_ref(&mut self) -> &mut Self

where Self: Sized,

Creates a “by reference” adapter for this instance of Read.

fn chain<R>(self, next: R) -> Chain<Self, R>

where R: Read, Self: Sized,

Creates an adapter which will chain this stream with another.

fn take(self, limit: u64) -> Take<Self>

where Self: Sized,

Creates an adapter which will read at most limit bytes from it.

impl Seek for File

fn seek(&mut self, pos: SeekFrom) -> Result<u64>

Seek to an offset, in bytes, in a stream.

fn rewind(&mut self) -> Result<(), AxError>

Rewind to the beginning of a stream.

fn stream_position(&mut self) -> Result<u64, AxError>

Returns the current seek position from the start of the stream.

fn stream_len(&mut self) -> Result<u64, AxError>

Returns the length of this stream (in bytes).

fn seek_relative(&mut self, offset: i64) -> Result<(), AxError>

Seeks relative to the current position.

impl Write for File

fn write(&mut self, buf: &[u8]) -> Result<usize>

Write a buffer into this writer, returning how many bytes were written.

fn flush(&mut self) -> Result<()>

Flush this output stream, ensuring that all intermediately buffered contents reach their destination.

fn write_all(&mut self, buf: &[u8]) -> Result<(), AxError>

Attempts to write an entire buffer into this writer.

fn write_fmt(&mut self, args: Arguments<'_>) -> Result<(), AxError>

Writes a formatted string into this writer, returning any error encountered.

fn by_ref(&mut self) -> &mut Self

where Self: Sized,

Creates a “by reference” adapter for this instance of Write.