metadata

metadata is a dart library to extract exif data of the images.

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Table of Contents

• Installing
• Usage
  • Imports
  • Read image file
  • Read image file from Asset Folder
  • Extract Exif Data
  • Extract Exif Data with callback
  • Saving Exif Content into File
• Upcoming Features
• Donate (Be the First one)

Lets Get Started

1. Depend on it

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

dependencies:
  metadata: any

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 awesome 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));
      }