Dart module to decode Exif data from jpeg files.
Dart port based on Exif.js: https://github.com/exif-js/exif-js/
Add this to your package's pubspec.yaml file:
dependencies:
exifdart:You can install packages from the command line:
$ pub get
Simple example:
// Add this to have the Rational class too:
// import "package:package:exifdart/exifdart.dart";
// We are not using that in this example, this alone will do fine:
import "package:package:exifdart/exifdart_html.dart";
import "dart:html";
/// Returns the orientation value or `null` if no EXIF or no orientation info
/// is found.
Future<int> getOrientation(Blob blob) async {
if (blob.type == "image/jpeg") {
Map<String, dynamic> tags = await readExifFromBlob(blob);
return tags["Orientation"];
}
return null;
}
void main() {
registerChangeHandler(document.querySelector("input[type=file]"));
}
void registerChangeHandler(InputElement input) {
input.onChange.listen((Event e) {
for (File f in input.files) {
getOrientation(f).then((int orientation) {
window.console.log("Orientation for ${f.name} is ${orientation}");
});
}
});
}