This is more of a proof of concept to show how to connect flutter to a Win32 api via dart:ffi and get an async callback.
If you're interested, the method in question here is Win32Midi.openMidiInput(...) in ./lib/win32_midi.dart
and its counterpart openMidiInput(...) in ./windows/win32_midi_plugin.cpp, which is taking
an async callback.
This project is a starting point for a Flutter plug-in package, a specialized package that includes platform-specific implementation code for Android and/or iOS.
For help getting started with Flutter, view our online documentation, which offers tutorials, samples, guidance on mobile development, and a full API reference.