metadata

Platform Pub Package License: MIT Donate Issue Forks Stars

metadata is a dart library to extract exif data of the images. It is purely written in dart, So it can be used on server as well as on client.

Table of Contents

Lets Get Started

1. Depend on it

Add this to your package's pubspec.yaml file:

dependencies:
  metadata: ^1.0.2

2. Install it

You can install packages from the command line:

with pub:

$  pub get

3. Import it

Now in your Dart code, you can use:

    import 'package:metadata/metadata.dart';

Usage

Imports

    import 'package:metadata/metadata.dart';
    

Read Image File

    var file = "path_to_pre_existing_image_file/image.jpg";
    var bytes = File(file).readAsBytesSync();
    

Read Image from Flutter's Asset Folder

    import 'package:flutter/services.dart' show ByteData, rootBundle;
    
    /* Your blah blah code here */
    
    ByteData data = await rootBundle.load("assets/path_to_pre_existing_image_file/image.jpg";);
    var bytes = data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes);
    

Extract Exif Data

    var result = MetaData.exifData(bytes);
    if (result.error == null) {
      var content = result.exifData; // exif data is available in contents
      saveFile(image_name, content);
    } else {
      print('File: $image.jpg, Error: ${result.error}');
    }
    

Extract Exif Data with callback

    MetaData.exifData(bytes, onValue: (CallBack result) {
      if (result.error == null) {
        var content = result.exifData;
        saveFile(image_name, content);
      } else {
        print('File: $image.jpg, Error: ${result.error}');
      }
    });
    

Extract XMP Data

    var mapResult = MetaData.extractXMP(bytes);
    print(mapResult.toString());
    saveFile(image_name, mapResult);
    

Saving exif content into File

      void saveFile(String fileName, dynamic exifContent) {
          File('${path}$fileName.json').writeAsStringSync(jsonEncode(exifContent));
      }
    

Features coming in next version

On-going implementation for future:

  • metadata of audio and video files
  • extracting file-types

Also checkout our other libraries:

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Libraries

metadata