Detect device change/disconnect

[Nicks182]

Hi

I'm probably just being an idiot, but I can't see a way to detect when a device is disconnected or changed.

For example, I would like to be able to get an event/notification when I turn on my Bluetooth headset. Normally I use my USB headset, but when I turn on my BT set then Windows will automatically switch to the BT set. I would like to be able to detect when the USB set is disconnected so I can react to it.

From what I can see on learn.microsoft.com, it should be possible with device events, but I can't see how to use these in this library.
https://learn.microsoft.com/en-us/windows/win32/coreaudio/device-events

[morphx666]

Unfortunately, the IMMNotificationClient interface is not properly implemented into the library... but it doesn't look too hard. Let me see if I can get it done by the end of the day.

[morphx666]

Please update your version of CoreAudio to use the IMMNotificationClient interface.

You will now see the exposed event handlers to handle notifications:

var devEnum = new MMDeviceEnumerator();
var client = new MMNotificationClient(devEnum);
client.DeviceAdded += (object o, DeviceNotificationEventArgs e) => {
    // Handle added device...
};

[Nicks182]

Thank you so much! Really appreciate it.

[jeanpaullm]

Hi, I am attempting to detect devices connection and disconnection. I tried what @morphx666 suggested, but it did not trigger whenever a new device was plugged in. As a workarround I was make it work using the following code:

var devEnum = new MMDeviceEnumerator();
var client = new MMNotificationClient(devEnum);
client.DeviceStateChanged += OnOutputDeviceChange;

private void OnOutputDeviceChange(object o, DeviceStateChangedEventArgs e)
        {
            if (e.DeviceState == DeviceState.Active) { Debug.WriteLine("Device is active");  }
            if (e.DeviceState == DeviceState.Disabled) { Debug.WriteLine("Device is disabled"); }
            if (e.DeviceState == DeviceState.NotPresent) { Debug.WriteLine("Device is not present"); }
            if (e.DeviceState == DeviceState.Unplugged) { Debug.WriteLine("Device is unplugged"); }
        }