extern crate exif;
use std::fs::File;
use std::io::BufReader;
use exif::{DateTime, In, Reader, Value, Tag};
fn main() {
let file = File::open("tests/exif.jpg").unwrap();
let exif = Reader::new().read_from_container(
&mut BufReader::new(&file)).unwrap();
let tag_list = [Tag::ExifVersion,
Tag::PixelXDimension,
Tag::XResolution,
Tag::ImageDescription,
Tag::DateTime];
for &tag in tag_list.iter() {
if let Some(field) = exif.get_field(tag, In::PRIMARY) {
println!("{}: {}",
field.tag, field.display_value().with_unit(&exif));
}
}
if let Some(field) = exif.get_field(Tag::PixelXDimension, In::PRIMARY) {
if let Some(width) = field.value.get_uint(0) {
println!("Valid width of the image is {}.", width);
}
}
if let Some(field) = exif.get_field(Tag::XResolution, In::PRIMARY) {
match field.value {
Value::Rational(ref vec) if !vec.is_empty() =>
println!("X resolution is {}.", vec[0].to_f64()),
_ => {},
}
}
if let Some(field) = exif.get_field(Tag::DateTime, In::PRIMARY) {
match field.value {
Value::Ascii(ref vec) if !vec.is_empty() => {
if let Ok(datetime) = DateTime::from_ascii(&vec[0]) {
println!("Year of DateTime is {}.", datetime.year);
}
},
_ => {},
}
}
}