Struct ndless::fs::Metadata

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pub struct Metadata(/* private fields */);

Expand description

Metadata information about a file.

This structure is returned from the metadata function or method and represents known metadata about a file such as its permissions, size, modification times, etc.

Implementations§

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impl Metadata

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pub fn file_type(&self) -> FileType

Returns the file type for this metadata.

§Examples

fn main() -> std::io::Result<()> {
    use std::fs;

    let metadata = fs::metadata("foo.txt")?;

    println!("{:?}", metadata.file_type());
    Ok(())
}

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pub fn is_dir(&self) -> bool

Returns true if this metadata is for a directory. The result is mutually exclusive to the result of is_file.

§Examples

fn main() -> std::io::Result<()> {
    use std::fs;

    let metadata = fs::metadata("foo.txt")?;

    assert!(!metadata.is_dir());
    Ok(())
}

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pub fn is_file(&self) -> bool

Returns true if this metadata is for a regular file. The result is mutually exclusive to the result of is_dir.

§Examples

use std::fs;

fn main() -> std::io::Result<()> {
    let metadata = fs::metadata("foo.txt")?;

    assert!(metadata.is_file());
    Ok(())
}

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pub fn len(&self) -> u64

Returns the size of the file, in bytes, this metadata is for.

§Examples

use std::fs;

fn main() -> std::io::Result<()> {
    let metadata = fs::metadata("foo.txt")?;

    assert_eq!(0, metadata.len());
    Ok(())
}

source

pub fn permissions(&self) -> Permissions

Returns the permissions of the file this metadata is for.

§Examples

use std::fs;

fn main() -> std::io::Result<()> {
    let metadata = fs::metadata("foo.txt")?;

    assert!(!metadata.permissions().readonly());
    Ok(())
}

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pub fn modified(&self) -> Result<SystemTime>

Returns the last modification time listed in this metadata.

The returned value corresponds to the mtime field of stat on Unix platforms and the ftLastWriteTime field on Windows platforms.

§Errors

This field may not be available on all platforms, and will return an Err on platforms where it is not available.

§Examples

use std::fs;

fn main() -> std::io::Result<()> {
    let metadata = fs::metadata("foo.txt")?;

    if let Ok(time) = metadata.modified() {
        println!("{:?}", time);
    } else {
        println!("Not supported on this platform");
    }
    Ok(())
}

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pub fn accessed(&self) -> Result<SystemTime>

Returns the last access time of this metadata.

The returned value corresponds to the atime field of stat on Unix platforms and the ftLastAccessTime field on Windows platforms.

Note that not all platforms will keep this field update in a file’s metadata, for example Windows has an option to disable updating this time when files are accessed and Linux similarly has noatime.

§Errors

This field may not be available on all platforms, and will return an Err on platforms where it is not available.

§Examples

use std::fs;

fn main() -> std::io::Result<()> {
    let metadata = fs::metadata("foo.txt")?;

    if let Ok(time) = metadata.accessed() {
        println!("{:?}", time);
    } else {
        println!("Not supported on this platform");
    }
    Ok(())
}

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pub fn created(&self) -> Result<SystemTime>

Returns the creation time listed in this metadata.

The returned value corresponds to the birthtime field of stat on Unix platforms and the ftCreationTime field on Windows platforms.

§Errors

This field may not be available on all platforms, and will return an Err on platforms where it is not available.

§Examples

use std::fs;

fn main() -> std::io::Result<()> {
    let metadata = fs::metadata("foo.txt")?;

    if let Ok(time) = metadata.created() {
        println!("{:?}", time);
    } else {
        println!("Not supported on this platform");
    }
    Ok(())
}