windows - Get list of audio devices and select one using c#

Question

Hi I am creating a desktop based application in windows using C#.

I have to show list of all available audio & video devices in 2 different combo boxes. Selecting any device from combo box will set that particular device as the default one

I am using WMI.

Code to get list of available audio devices:

ManagementObjectSearcher mo = 
      new ManagementObjectSearcher("select * from Win32_SoundDevice");

foreach (ManagementObject soundDevice in mo.Get())
{
     String deviceId = soundDevice.GetPropertyValue("DeviceId").ToString();
     String name  = soundDevice.GetPropertyValue("Name").ToString();

  //saving the name  and device id in array
} 

if i try to set the device like this:

 using (RegistryKey audioDeviceKey = 
Registry.LocalMachine.OpenSubKey(audioDevicesReg
   + @"" + audioDeviceList.SelectedText.ToString(), true)){}

i get exception :

System.Security.SecurityException occurred in mscorlib.dll

Now I have few questions:

1) How to set the selected device as the default audio device?
2) The array contains device name as : "High Definition audio device" 
even when I have attached a headset.
3) I want the list as speaker,headset etc...How to get that?

can anybody point me in the right direction?

Answer 1

1. There is no documented mechanism for changing the default audio device.
2. That's because you're enumerating the physical audio devices, not the audio endpoints.
3. You want to use the IMMDeviceEnumerator API to enumerate the audio endpoints (speakers, etc).

Unfortunately there is no managed interop published by Microsoft for the IMMDeviceEnumerator API, you'll need to define your own (there are several definitions available on the internet).