Multi Instance Handler (multi_instance_handler)

Detects and handles multiple instances of an application. This library allows you to forward command line arguments from second instances of an application, force a single instance of an application, or both.

Compatibility

This library is designed for use in Flutter applications. Support in Dart tools is undefined.

This library currently only supports Flutter applications on the Windows platform.

Usage

import 'package:multi_instance_handler/multi_instance_handler.dart';

void main(List<String> arguments) async {
  if (await isFirstInstance(arguments)) {
    onSecondInstance((List<String> args) {
      print("Second instance launched with: $args");
    });
    runApp(MyApp());
  } else {
    print("Found existing instance, quitting!");
    exit(0);
  }
}

TODO

• Add macOS support
• Add Linux support
• Ensure first instance window is hidden when loading (third-party issue).

License & Author

This library was written by Loren Segal in 2021 and licensed under the terms of the MIT license.