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Working with MIDI in Windows Store app (Win 8.1)

My goal is to receive MIDI messages in Windows Store apps. Microsoft has provided an API called Microsoft.WindowsPreview.MidiRT

(as a nuget package).

I was able to get the MIDI port, but no event MessageReceived

was raised even though I press keys on my MIDI keyboard and other MIDI programs show that the computer is receiving these messages.

Here is my code:

public sealed partial class MainPage : Page
{
    private MidiInPort port;

    public MainPage()
    {
        this.InitializeComponent();
        DeviceWatcher watcher = DeviceInformation.CreateWatcher();
        watcher.Updated += watcher_Updated;
        watcher.Start();
    }

    protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
    {
        base.OnNavigatingFrom(e);
        port.Dispose();
    }

    async void watcher_Updated(DeviceWatcher sender, DeviceInformationUpdate args)
    {
        DeviceInformationCollection deviceCollection = await DeviceInformation.FindAllAsync(MidiInPort.GetDeviceSelector());
        foreach (var item in deviceCollection)
        {
            Debug.WriteLine(item.Name);
            if (port == null)
            {
                port = await MidiInPort.FromIdAsync(item.Id);
                port.MessageReceived += port_MessageReceived;
            }
        }
    }

    void port_MessageReceived(MidiInPort sender, MidiMessageReceivedEventArgs args)
    {
        Debug.WriteLine(args.Message.Type);
    }
}

Any ideas?

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2 answers


I managed to get it to work. I changed platfrom to x64 and now it works (I used it for x86). There is also a problem (and it is even bigger): I want to integrate this with Unity3d, but Unity3d does not allow creating x64 applications for Windows, on the other hand, x86 MIDI assembly does not work on x64 machines.

Added:



Even though this API depends on your architecture, the new Windows 10 api reportedly doesn't do this, so it should be easier if you're targeting Win10.

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Possibly related: Your device's observer code does not match the normal pattern. Here's what you need to do:



DeviceWatcher midiWatcher;

void MonitorMidiChanges()
{
  if (midiWatcher != null)
    return;

  var selector = MidiInPort.GetDeviceSelector();
  midiWatcher = DeviceInformation.CreateWatcher(selector);

  midiWatcher.Added += (s, a) => Debug.WriteLine("Midi Port named '{0}' with Id {1} was added", a.Name, a.Id);
  midiWatcher.Updated += (s, a) => Debug.WriteLine("Midi Port with Id {1} was updated", a.Id);
  midiWatcher.Removed += (s, a) => Debug.WriteLine("Midi Port with Id {1} was removed", a.Id);
  midiWatcher.EnumerationCompleted += (s, a) => Debug.WriteLine("Initial enumeration complete; watching for changes...");

  midiWatcher.Start();
}
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