Flutter convert ByteData to File

quinzo 0
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I'm using this template/package to draw in Flutter https://pub.dev/packages/scribble/example. Now I want to convert the drawn image to a File. So that I can use it in my tflite model. To predict the image the runModelOnImage (tflite package) function requires a path to the image. The used scribble package, provides the saveImage function to return the drawn image as byteData:

// saveImage
    Future<void> _saveImage(BuildContext context) async {
        final image = await notifier.renderImage();
        showDialog(
          context: context,
          builder: (context) => AlertDialog(
            title: const Text("Your Image"),
            content: Image.memory(image.buffer.asUint8List()),
          ),
        );
      }

How can I transform the byteData image to a File so I can use it in my model?

tensorflow-lite flutter
1 Answers

ByteData is an abstraction for:

A fixed-length, random-access sequence of bytes that also provides random and unaligned access to the fixed-width integers and floating point numbers represented by those bytes. As Gunter mentioned in the comments, you can use File.writeAsBytes. It does require a bit of API work to get from ByteData to a List, however.

import 'dart:async';
import 'dart:io';
import 'dart:typed_data';

Future<void> writeToFile(ByteData data, String path) {
  final buffer = data.buffer;
  return new File(path).writeAsBytes(
      buffer.asUint8List(data.offsetInBytes, data.lengthInBytes));
}

You can read more about this on here

Rohan Jariwala0
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