You can do it using NAudio's MMDeviceEnumerator and IMMNotificationClient. However you add Implementations for RegisterEndpointNotificationCallback & UnRegisterEndpointNotificationCallback to MMDeviceEnumerator Class
The implementations are
/// <summary>
/// Registers a call back for Device Events
/// </summary>
/// <param name="client">Object implementing IMMNotificationClient type casted as IMMNotificationClient interface</param>
/// <returns></returns>
public int RegisterEndpointNotificationCallback([In] [MarshalAs(UnmanagedType.Interface)] IMMNotificationClient client)
{
//DeviceEnum declared below
return deviceEnum.RegisterEndpointNotificationCallback(client);
}
/// <summary>
/// UnRegisters a call back for Device Events
/// </summary>
/// <param name="client">Object implementing IMMNotificationClient type casted as IMMNotificationClient interface </param>
/// <returns></returns>
public int UnRegisterEndpointNotificationCallback([In] [MarshalAs(UnmanagedType.Interface)] IMMNotificationClient client)
{
//DeviceEnum declared below
return deviceEnum.UnregisterEndpointNotificationCallback(client);
}
Then create a class that implements IMMNotificationClient
sample:
class NotificationClientImplementation : NAudio.CoreAudioApi.Interfaces.IMMNotificationClient
{
public void OnDefaultDeviceChanged(DataFlow dataFlow, Role deviceRole, string defaultDeviceId)
{
//Do some Work
Console.WriteLine("OnDefaultDeviceChanged --> {0}", dataFlow.ToString());
}
public void OnDeviceAdded(string deviceId)
{
//Do some Work
Console.WriteLine("OnDeviceAdded -->");
}
public void OnDeviceRemoved(string deviceId)
{
Console.WriteLine("OnDeviceRemoved -->");
//Do some Work
}
public void OnDeviceStateChanged(string deviceId, DeviceState newState)
{
Console.WriteLine("OnDeviceStateChanged\n Device Id -->{0} : Device State {1}", deviceId, newState);
//Do some Work
}
public NotificationClientImplementation()
{
//_realEnumerator.RegisterEndpointNotificationCallback();
if (System.Environment.OSVersion.Version.Major < 6)
{
throw new NotSupportedException("This functionality is only supported on Windows Vista or newer.");
}
}
public void OnPropertyValueChanged(string deviceId, PropertyKey propertyKey)
{
//Do some Work
//fmtid & pid are changed to formatId and propertyId in the latest version NAudio
Console.WriteLine("OnPropertyValueChanged: formatId --> {0} propertyId --> {1}", propertyKey.formatId.ToString(), propertyKey.propertyId.ToString());
}
}
Then all you have to do is
- Declare the following NAudio Objects and your implementation of IMMNotificationClient
Sample:
private NAudio.CoreAudioApi.MMDeviceEnumerator deviceEnum = new NAudio.CoreAudioApi.MMDeviceEnumerator();
private NotificationClientImplementation notificationClient;
private NAudio.CoreAudioApi.Interfaces.IMMNotificationClient notifyClient;
- Then type cast notificationClient as IMMNotificationClient and pass it as a parameter to MMDeviceEnumerator
Sample:
notificationClient = new NotificationClientImplementation();
notifyClient = (NAudio.CoreAudioApi.Interfaces.IMMNotificationClient)notificationClient;
deviceEnum.RegisterEndpointNotificationCallback(notifyClient);
Hope this helps some body. Thanks to MSDN Forums and particularly Michael Taylor
http://msmvps.com/blogs/p3net for helping me with this.
Thanks & Cheers.
