CODEWITHSUNDEEP
flutterdart
JengaAttack
JengaAttack

Reputation: 1

Flutter writeAsBytes from dart:io library returns PathNotFoundException

I am trying to use the following function in flutter:

Future<File> getFile(String fileName) async {
  final appDir = await getTemporaryDirectory();
  final appPath = appDir.path;
  final fileOnDevice = File('$appPath/$fileName');
  final rawAssetFile = await rootBundle.load(fileName);
  final rawBytes = rawAssetFile.buffer.asUint8List();
  await fileOnDevice.writeAsBytes(rawBytes, flush: true);
  return fileOnDevice;
}

But somehow i keep getting this error, failed PathNotFoundException: Cannot open file, path = '/var/mobile/Containers/Data/Application/352527E9-XXXX-XXXX-XXXX-DCFXXXXXXXXX/Library/Caches/assets/

The function is called by final dataFile = await getFile('assets/sample.txt');

Does anyone know how to solve this? Any help is appreciated!

This is my flutter doctor -v

[✓] Flutter (Channel stable, 3.7.0, on macOS 13.1 22C65 darwin-arm64, locale en-SG) • Flutter version 3.7.0 on channel stable at /Users/xaviertoh/Documents/Flutter/flutter • Upstream repository https://github.com/flutter/flutter.git • Framework revision b06b8b2710 (3 weeks ago), 2023-01-23 16:55:55 -0800 • Engine revision b24591ed32 • Dart version 2.19.0 • DevTools version 2.20.1

[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.1) • Android SDK at /Users/xaviertoh/Library/Android/sdk • Platform android-33, build-tools 33.0.1 • Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java • Java version OpenJDK Runtime Environment (build 11.0.13+0-b1751.21-8125866) • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 14.2) • Xcode at /Applications/Xcode.app/Contents/Developer • Build 14C18 • CocoaPods version 1.11.3

[✓] Chrome - develop for the web • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2021.3) • Android Studio at /Applications/Android Studio.app/Contents • Flutter plugin can be installed from: 🔨 https://plugins.jetbrains.com/plugin/9212-flutter • Dart plugin can be installed from: 🔨 https://plugins.jetbrains.com/plugin/6351-dart • Java version OpenJDK Runtime Environment (build 11.0.13+0-b1751.21-8125866)

[✓] VS Code (version 1.75.0) • VS Code at /Applications/Visual Studio Code.app/Contents • Flutter extension version 3.58.0

[✓] Connected device (3 available) • iPhone (mobile) • 00008020-000D05313C02002E • ios • iOS 13.5 17F75 • macOS (desktop) • macos • darwin-arm64 • macOS 13.1 22C65 darwin-arm64 • Chrome (web) • chrome • web-javascript • Google Chrome 110.0.5481.77

[✓] HTTP Host Availability • All required HTTP hosts are available

• No issues found!

Thank you for reading!

Things i have tried:

  1. I have confirmed that my file name is correct in the assets folder and i also tried running this code in various locations in the code such as in a widget and also in main() just to test it out.

  2. I also tried running flutter in xcode and visual studio code.

  3. Also tried to run the code in android emulator and also on iPhone physical device.

Upvotes: 0

Views: 752

Answers (1)

jamesdlin
jamesdlin

Reputation: 89975

The /var/mobile/Containers/Data/Application/.../Library/Caches/assets/ directory must already exist. File.writeAsBytes won't automatically create parent directories for you.

You can do that step by first doing:

await fileOnDevice.parent.create(recursive: true);

Upvotes: 1

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