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Given this code:
let any_offset: u64 = 42;
let mut file = File::open("/home/user/file").unwrap();
file.seek(SeekFrom::Start(any_offset));
// println!("{:?}", file.cursor_position())
How can I obtain the current cursor position?
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position = ftell( fileID ) returns the current location of the position pointer in the specified file. If the query is successful, then position is a zero-based integer that indicates the number of bytes from the beginning of the file.
The ftell() function returns the current position of the read/write pointer in an open file.
fseek() is used to move file pointer associated with a given file to a specific position. position defines the point with respect to which the file pointer needs to be moved.
File handle is also called as file pointer or cursor. For example, when you open a file in write mode, the file pointer is placed at the 0th position, i.e., at the start of the file.
You should call Seek:seek with a relative offset of 0. This has no side effect and returns the information you are looking for.
Seek is implemented for a number of types, including:
impl Seek for Fileimpl<'_> Seek for &'_ Fileimpl<'_, S: Seek + ?Sized> Seek for &'_ mut Simpl<R: Seek> Seek for BufReader<R>impl<S: Seek + ?Sized> Seek for Box<S>impl<T> Seek for Cursor<T> whereimpl<W: Write + Seek> Seek for BufWriter<W>Using the Cursor class mentioned by Aaronepower might be more efficient though, since you could avoid having to make an extra system call.
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