public static extern void ActivateAudioInterfaceAsync(
[In, MarshalAs(UnmanagedType.LPWStr)] string deviceInterfacePath,
[In, MarshalAs(UnmanagedType.LPStruct)] Guid riid,
[In] IntPtr activationParams, // n.b. is actually a pointer to a PropVariant, but we never need to pass anything but null
[In] IActivateAudioInterfaceCompletionHandler completionHandler,
out IActivateAudioInterfaceAsyncOperation activationOperation);
static extern HResult ActivateAudioInterfaceAsync(
[MarshalAs(UnmanagedType.LPWStr)] string deviceInterfacePath,
[MarshalAs(UnmanagedType.LPStruct)] Guid riid,
IntPtr activationParams,
IActivateAudioInterfaceCompletionHandler completionHandler,
out IActivateAudioInterfaceAsyncOperation activationOperation);
private static extern uint ActivateAudioInterfaceAsyncInternal([In][MarshalAs(UnmanagedType.LPWStr)] string deviceInterfacePath, [In][MarshalAs(UnmanagedType.LPStruct)] Guid riid, [In] IntPtr activationParams, [In] IActivateAudioInterfaceCompletionHandler completionHandler, out IActivateAudioInterfaceAsyncOperation activationOperation);