pub trait MetadataExt {
// Required methods
fn file_attributes(&self) -> u32;
fn creation_time(&self) -> u64;
fn last_access_time(&self) -> u64;
fn last_write_time(&self) -> u64;
fn file_size(&self) -> u64;
fn volume_serial_number(&self) -> Option<u32>;
fn number_of_links(&self) -> Option<u32>;
fn file_index(&self) -> Option<u64>;
}
Expand description
Windows-specific extensions to fs::Metadata
.
The data members that this trait exposes correspond to the members
of the BY_HANDLE_FILE_INFORMATION
structure.
Required Methods§
sourcefn file_attributes(&self) -> u32
fn file_attributes(&self) -> u32
Returns the value of the dwFileAttributes
field of this metadata.
This field contains the file system attribute information for a file or directory. For possible values and their descriptions, see File Attribute Constants in the Windows Dev Center.
§Examples
use std::io;
use std::fs;
use std::os::windows::prelude::*;
fn main() -> io::Result<()> {
let metadata = fs::metadata("foo.txt")?;
let attributes = metadata.file_attributes();
Ok(())
}
Runsourcefn creation_time(&self) -> u64
fn creation_time(&self) -> u64
Returns the value of the ftCreationTime
field of this metadata.
The returned 64-bit value is equivalent to a FILETIME
struct,
which represents the number of 100-nanosecond intervals since
January 1, 1601 (UTC). The struct is automatically
converted to a u64
value, as that is the recommended way
to use it.
If the underlying filesystem does not support creation time, the returned value is 0.
§Examples
use std::io;
use std::fs;
use std::os::windows::prelude::*;
fn main() -> io::Result<()> {
let metadata = fs::metadata("foo.txt")?;
let creation_time = metadata.creation_time();
Ok(())
}
Runsourcefn last_access_time(&self) -> u64
fn last_access_time(&self) -> u64
Returns the value of the ftLastAccessTime
field of this metadata.
The returned 64-bit value is equivalent to a FILETIME
struct,
which represents the number of 100-nanosecond intervals since
January 1, 1601 (UTC). The struct is automatically
converted to a u64
value, as that is the recommended way
to use it.
For a file, the value specifies the last time that a file was read from or written to. For a directory, the value specifies when the directory was created. For both files and directories, the specified date is correct, but the time of day is always set to midnight.
If the underlying filesystem does not support last access time, the returned value is 0.
§Examples
use std::io;
use std::fs;
use std::os::windows::prelude::*;
fn main() -> io::Result<()> {
let metadata = fs::metadata("foo.txt")?;
let last_access_time = metadata.last_access_time();
Ok(())
}
Runsourcefn last_write_time(&self) -> u64
fn last_write_time(&self) -> u64
Returns the value of the ftLastWriteTime
field of this metadata.
The returned 64-bit value is equivalent to a FILETIME
struct,
which represents the number of 100-nanosecond intervals since
January 1, 1601 (UTC). The struct is automatically
converted to a u64
value, as that is the recommended way
to use it.
For a file, the value specifies the last time that a file was written to. For a directory, the structure specifies when the directory was created.
If the underlying filesystem does not support the last write time, the returned value is 0.
§Examples
use std::io;
use std::fs;
use std::os::windows::prelude::*;
fn main() -> io::Result<()> {
let metadata = fs::metadata("foo.txt")?;
let last_write_time = metadata.last_write_time();
Ok(())
}
Runsourcefn file_size(&self) -> u64
fn file_size(&self) -> u64
Returns the value of the nFileSize{High,Low}
fields of this
metadata.
The returned value does not have meaning for directories.
§Examples
use std::io;
use std::fs;
use std::os::windows::prelude::*;
fn main() -> io::Result<()> {
let metadata = fs::metadata("foo.txt")?;
let file_size = metadata.file_size();
Ok(())
}
Runsourcefn volume_serial_number(&self) -> Option<u32>
fn volume_serial_number(&self) -> Option<u32>
windows_by_handle
#63010)Returns the value of the dwVolumeSerialNumber
field of this
metadata.
This will return None
if the Metadata
instance was created from a
call to DirEntry::metadata
. If this Metadata
was created by using
fs::metadata
or File::metadata
, then this will return Some
.
sourcefn number_of_links(&self) -> Option<u32>
fn number_of_links(&self) -> Option<u32>
windows_by_handle
#63010)Returns the value of the nNumberOfLinks
field of this
metadata.
This will return None
if the Metadata
instance was created from a
call to DirEntry::metadata
. If this Metadata
was created by using
fs::metadata
or File::metadata
, then this will return Some
.
sourcefn file_index(&self) -> Option<u64>
fn file_index(&self) -> Option<u64>
windows_by_handle
#63010)Returns the value of the nFileIndex{Low,High}
fields of this
metadata.
This will return None
if the Metadata
instance was created from a
call to DirEntry::metadata
. If this Metadata
was created by using
fs::metadata
or File::metadata
, then this will return Some
.