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protected override void WndProc(ref Message m)                    

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protected virtual IntPtr WndProc(
    IntPtr hwnd,
    int msg,
    IntPtr wParam,
    IntPtr lParam,
    ref bool handled
)                    

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        IntPtr handle;
        UsbHidPort usb = new UsbHidPort();

        protected override void OnSourceInitialized(EventArgs e)
        {
            base.OnSourceInitialized(e);

            WindowInteropHelper helper = new WindowInteropHelper(this);
            handle = helper.Handle;
            HwndSource source = HwndSource.FromHwnd(handle);

            source.AddHook(WindowProc);
        }

        private IntPtr WindowProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
        {
            System.Windows.Forms.Message ms = new System.Windows.Forms.Message();
            ms.HWnd = hwnd;
            ms.LParam = lParam;
            ms.Msg = msg;
            ms.WParam = wParam;

            usb.ParseMessages(ref ms);

            return IntPtr.Zero;
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            usb.RegisterHandle(handle);
        }