Struct exif::Reader

pub struct Reader { /* fields omitted */ }

The Reader struct reads a JPEG or TIFF image, parses the Exif attributes in it, and holds the results.

Examples

use exif::{In, Reader, Tag};
let file = std::fs::File::open("tests/exif.jpg").unwrap();
let reader = Reader::new(&mut std::io::BufReader::new(&file)).unwrap();
let xres = reader.get_field(Tag::XResolution, In::PRIMARY).unwrap();
assert_eq!(xres.display_value().with_unit(&reader).to_string(),
           "72 pixels per inch");

Methods

impl Reader

pub fn new<R>(reader: &mut R) -> Result<Reader, Error> where
    R: BufRead, 

Reads a JPEG or TIFF image and parses the Exif attributes in it. If an error occurred, exif::Error is returned.

pub fn buf(&self) -> &[u8]

Returns the slice that contains the TIFF data.

pub fn fields(&self) -> impl ExactSizeIterator<Item = &Field>

Returns a slice of Exif fields.

pub fn little_endian(&self) -> bool

Returns true if the TIFF data is in the little-endian byte order.

pub fn get_field(&self, tag: Tag, ifd_num: In) -> Option<&Field>

Returns a reference to the Exif field specified by the tag and the IFD number.