quick and dirty enumeration of USB devices, endpoint polling, and setting windows default audio playback device

mbutil.cs

using LibUsbDotNet.Info;
using LibUsbDotNet.LibUsb;
using LibUsbDotNet.Main;

using System;
using System.Collections.ObjectModel;
using System.Linq;
using AudioEndPoint;

namespace Examples
{
    internal class ShowInfo
    {
        public static void Main(string[] args)
        {
            // Dump all devices and descriptor information to console output.
            using (UsbContext context = new UsbContext())
            {
                var allDevices = context.List();
                foreach(var usbRegistry in allDevices)
                {
                    if (usbRegistry.TryOpen())
                    {
                        UsbDevice device = usbRegistry as UsbDevice;
                        if(device.Descriptor.Manufacturer == "foobar.com")
                        {
                            byte[] epBuf = new byte[1];
                            var myDevice = device;
                            if(myDevice.ClaimInterface(0))
                            {
                                Console.WriteLine($"Device open, interface 0 claimed: {device.ToString()}");
                                UsbEndpointReader reader = myDevice.OpenEndpointReader(ReadEndpointID.Ep01, 1, EndpointType.Interrupt);
                                byte buttonState = 0;
                                while (true)
                                {
                                    int bytesRead = 0;
                                    var err = reader.Read(epBuf, 0, out bytesRead);
                                    if (epBuf[0] != buttonState)
                                    {
                                        buttonState = epBuf[0];
                                        // Console.WriteLine($"Button: {buttonState}");

                                        if(buttonState != 0)
                                        {
                                            var audioPlaybackDevices = AudioEndPointControllerWrapper.AudioController.GetActivePlaybackDevices();
                                            bool setDefault = false;
                                            Action<AudioEndPointControllerWrapper.IAudioDevice> setAsDefault = x =>
                                            {
                                                Console.WriteLine($"{x} set as default.");
                                                x.SetAsDefault(AudioEndPointControllerWrapper.Role.Multimedia);
                                            };
                                            foreach (var audioDevice in audioPlaybackDevices)
                                            {
                                                if(setDefault)
                                                {
                                                    setAsDefault(audioDevice);
                                                    break;
                                                }
                                                if (audioDevice.IsDefault(AudioEndPointControllerWrapper.Role.Multimedia))
                                                {
                                                    if(audioDevice == audioPlaybackDevices.Last())
                                                    {
                                                        setAsDefault(audioPlaybackDevices.First());
                                                        break;
                                                    }
                                                    setDefault = true;
                                                }
                                            }
                                        }
                                    }
                                }
                            }
                        }

                        usbRegistry.Close();
                    }
                }
            }

            // Wait for user input..
            Console.WriteLine("Press any key to exit");
            Console.ReadKey();
        }
    }
}