CODEWITHSUNDEEP
dartflutter
Seth Ladd
Seth Ladd

Reputation: 120529

How do I create a "fake" dart:io File from in-memory bytes?

I have the in-memory bytes of a "blob", but the API that I want to process this "blob" with only accepts dart:io File objects.

Is there a way to create a "fake" dart:io File , simply wrapping my in-memory bytes, so that I can pass this "fake" File to my API?

Assume that a file system doesn't exist, and assume that I can't write the in-memory bytes to a "real" file.

Thanks!

Upvotes: 28

Views: 11166

Answers (4)

André Sousa
André Sousa

Reputation: 558

I always use cross_file when designing APIs that work with files.

In addition to working on multiple platforms, it also has an XFile.fromData constructor that allows you to create a file in memory.

Upvotes: 0

Elias Andualem
Elias Andualem

Reputation: 366

You can override the io using the IOOverides class. See the below example:

await IOOverrides.runZoned(() async {
  // Write your code here.
  },
  createDirectory: (p0) {
    return MockDirectory()
  },
  createFile: (p0) {
    return MockeFile();
  },
);

You can check the doc here for more info.

Upvotes: 0

Hugo Passos
Hugo Passos

Reputation: 8427

You can create a memory-file using MemoryFileSystem from the package file:

Example:

File file = MemoryFileSystem().file('test.dart')
  ..writeAsBytesSync(blobBytes);

Upvotes: 26

Putra Ardiansyah
Putra Ardiansyah

Reputation: 5863

Add path provider dependency on pubspec.yaml

dependencies:
  path_provider: 0.2.2

Write byte data to file, use it, then delete it.

import 'dart:io';
import 'package:path_provider/path_provider.dart';

main() async {
  String dir = (await getTemporaryDirectory()).path;
  File temp = new File('$dir/temp.file');
  var bytes = [0, 1, 2, 3, 4, 5];
  await temp.writeAsBytes(bytes);
  /*do something with temp file*/
  temp.delete();
}

Upvotes: 12

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