不能获取window中WindowsFormsHost里activeX控件的WM_TOUCH消息

Question

如题，window中其他的控件的WM_TOUCH消息都去到了，但是WindowsFormsHost的没去到。有没有办法获得WindowsFormsHost里的WM_TOUCH消息？WindowsFormsHost里的鼠标消息也没得到。

我用得是：

            System.IntPtr hWnd = new System.Windows.Interop.WindowInteropHelper(this).Handle;

            if (!RegisterTouchWindow(hWnd, 0))
            {
                Debug.Print("ERROR: Could not register window for multi-touch");
            }

            // GetTouchInputInfo needs to be
            // passed the size of the structure it will be filling.
            // We get the size upfront so it can be used later.
            touchInputSize = Marshal.SizeOf(new TOUCHINPUT());

            /// 将窗口MainWindow与WndProc关联起来
            HwndSource hwndSource = PresentationSource.FromVisual(this) as HwndSource;
            if (hwndSource != null)
            {
                hwndSource.AddHook(new HwndSourceHook(WndProc));
            }

 

protected virtual IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
        {
            switch (msg)
            {
                case WM_TOUCH:
                    {
                        handled = DecodeTouch(wParam, lParam);
                    }
                    break;
                case WM_LBUTTONDOWN:
                    {
                        System.Windows.MessageBox.Show("asdfsdfs");
                    }
                    break;
              
            }

            return IntPtr.Zero;
        }