public VolumeControl()
{
var defaultAudioRenderDevice = MediaDevice.GetDefaultAudioRenderId(AudioDeviceRole.Default);
var activateAudioInterfaceCompletionHandler = new ActivateAudioInterfaceCompletionHandler <IAudioEndpointVolume>();
IActivateAudioInterfaceAsyncOperation activateOperation;
var hr = ActivateAudioInterfaceAsync(defaultAudioRenderDevice, typeof(IAudioEndpointVolume).GetTypeInfo().GUID, IntPtr.Zero, (IActivateAudioInterfaceCompletionHandler)activateAudioInterfaceCompletionHandler, out activateOperation);
Debug.Assert(hr == HResult.S_OK);
_audioEndpointVolume = GetAudioEndpointVolumeInterface();
Debug.Assert(_audioEndpointVolume != null);
}
private static IAudioEndpointVolume GetAudioEndpointVolumeInterface()
{
var speakerId = MediaDevice.GetDefaultAudioRenderId(AudioDeviceRole.Default);
var completionHandler = new ActivateAudioInterfaceCompletionHandler <IAudioEndpointVolume>();
var hr = ActivateAudioInterfaceAsync(
speakerId,
typeof(IAudioEndpointVolume).GetTypeInfo().GUID,
IntPtr.Zero,
completionHandler,
out var activateOperation);
Debug.Assert(hr == (uint)HResult.S_OK);
return(completionHandler.WaitForCompletion());
}