Detect audio device plugged unplugged RRS feed

  • Question

  • Hi

    I am trying to get an event when an audio device is plugged or unplugged

    I was trying to use CoreAudio API I created ImmNotificationClient.cs interface

    using System;
    using System.Collections.Generic;
    using System.Text;
    using System.Runtime.InteropServices;

    namespace CoreAudioApi.Interfaces
        /// <summary>
        /// IMMNotificationClient
        /// </summary>
        public interface IMMNotificationClient
            /// <summary>
            /// Device State Changed
            /// </summary>
            void OnDeviceStateChanged([MarshalAs(UnmanagedType.LPWStr)] string deviceId, [MarshalAs(UnmanagedType.I4)] EDeviceState newState);

            /// <summary>
            /// Device Added
            /// </summary>

     void OnDeviceAdded([MarshalAs(UnmanagedType.LPWStr)] string pwstrDeviceId);

            /// <summary>
            /// Device Removed
            /// </summary>
            void OnDeviceRemoved([MarshalAs(UnmanagedType.LPWStr)] string deviceId);

            /// <summary>
            /// Default Device Changed
            /// </summary>
            void OnDefaultDeviceChanged(EDataFlow flow, ERole role, [MarshalAs(UnmanagedType.LPWStr)] string defaultDeviceId);

            /// <summary>
            /// Property Value Changed
            /// </summary>
            /// <param name="pwstrDeviceId"></param>
            /// <param name="key"></param>
            void OnPropertyValueChanged([MarshalAs(UnmanagedType.LPWStr)] string pwstrDeviceId, PropertyKey key);

    I have created CMMNotificationClient.cs class which implements above methods

    Now I am not sure How to register the call back to these methods and register for Plug and UnPlug Events

    I tried to register it in the IMMDeviceEnumerator

            int RegisterEndpointNotificationCallback(IMMNotificationClient pClient);
            int UnregisterEndpointNotificationCallback(IMMNotificationClient pClient);

    Can you please help on this or can you provide any other solution



    Sunday, February 9, 2014 6:31 AM

All replies

  • Hi GouravSharma,

    Your best approach is probably WMI. You can subscribe to WMI events reflecting the creation/destruction of instances of most WMI classes. An instance of Win32_SoundDevic exists for each audio device. See the following link. http://msdn.microsoft.com/en-us/library/windows/desktop/aa394463%28v=vs.85%29.aspx.


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    Monday, February 10, 2014 5:56 AM
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