MagicVolume/VolTest.cs at main · TurtlesMaster1/MagicVolume · GitHub

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// Verifies the output half of MagicVolume: that the volume keystrokes it
// synthesises really do move the Windows master volume.
using System;
using System.Runtime.InteropServices;
using System.Threading;

[ComImport, Guid("BCDE0395-E52F-467C-8E3D-C4579291692E")] class MMDeviceEnumerator { }

[ComImport, Guid("A95664D2-9614-4F35-A746-DE8DB63617E6"),
 InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
interface IMMDeviceEnumerator {
    int EnumAudioEndpoints(int dataFlow, int mask, out IntPtr col);
    int GetDefaultAudioEndpoint(int dataFlow, int role, out IMMDevice dev);
}

[ComImport, Guid("D666063F-1587-4E43-81F1-B948E807363F"),
 InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
interface IMMDevice {
    int Activate(ref Guid iid, int ctx, IntPtr param,
                 [MarshalAs(UnmanagedType.IUnknown)] out object iface);
}

[ComImport, Guid("5CDF2C82-841E-4546-9722-0CF74078229A"),
 InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
interface IAudioEndpointVolume {
    int RegisterControlChangeNotify(IntPtr n);
    int UnregisterControlChangeNotify(IntPtr n);
    int GetChannelCount(out uint c);
    int SetMasterVolumeLevel(float d, ref Guid ctx);
    int SetMasterVolumeLevelScalar(float d, ref Guid ctx);
    int GetMasterVolumeLevel(out float d);
    int GetMasterVolumeLevelScalar(out float d);
    int SetChannelVolumeLevel(uint ch, float d, ref Guid ctx);
    int SetChannelVolumeLevelScalar(uint ch, float d, ref Guid ctx);
    int GetChannelVolumeLevel(uint ch, out float d);
    int GetChannelVolumeLevelScalar(uint ch, out float d);
    int SetMute([MarshalAs(UnmanagedType.Bool)] bool m, ref Guid ctx);
    int GetMute([MarshalAs(UnmanagedType.Bool)] out bool m);
}

class VolTest {
    [DllImport("user32.dll")] static extern void keybd_event(byte vk, byte scan, uint flags, UIntPtr extra);
    const byte VK_VOLUME_DOWN = 0xAE, VK_VOLUME_UP = 0xAF;
    const uint KEYUP = 0x0002;

    static IAudioEndpointVolume Endpoint() {
        var en = (IMMDeviceEnumerator)new MMDeviceEnumerator();
        IMMDevice dev;
        en.GetDefaultAudioEndpoint(0, 1, out dev);   // eRender, eMultimedia
        Guid iid = typeof(IAudioEndpointVolume).GUID;
        object o;
        dev.Activate(ref iid, 23, IntPtr.Zero, out o);
        return (IAudioEndpointVolume)o;
    }

    static void Tap(byte vk) {
        keybd_event(vk, 0, 0, UIntPtr.Zero);
        keybd_event(vk, 0, KEYUP, UIntPtr.Zero);
        Thread.Sleep(160);
    }

    static void Main() {
        var vol = Endpoint();
        float start; vol.GetMasterVolumeLevelScalar(out start);
        Console.WriteLine("volume before : " + Math.Round(start * 100) + "%");

        Tap(VK_VOLUME_UP);
        float up; vol.GetMasterVolumeLevelScalar(out up);
        Console.WriteLine("after VOL_UP  : " + Math.Round(up * 100) + "%");

        Tap(VK_VOLUME_DOWN);
        float back; vol.GetMasterVolumeLevelScalar(out back);
        Console.WriteLine("after VOL_DOWN: " + Math.Round(back * 100) + "%");

        Console.WriteLine(Math.Abs(up - start) > 0.001f
            ? "RESULT: volume commands work."
            : "RESULT: volume did NOT move.");
    }
}