C# 调用Win8系统键盘

private const Int32 WM_SYSCOMMAND = 274;
        private const UInt32 SC_CLOSE = 61536;
        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        private static extern bool PostMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        private static extern bool PostMessage(IntPtr hWnd, int Msg, uint wParam, uint lParam);
        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        private static extern bool PostMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern int RegisterWindowMessage(string lpString);
 
        //显示屏幕键盘
        public static int ShowInputPanel()
        {
            try
            {
                dynamic file = "C:\Program Files\Common Files\microsoft shared\ink\TabTip.exe";
                if (!System.IO.File.Exists(file))
                    return -1;
                Process.Start(file);
                return SetUnDock();
            }
            catch (Exception)
            {
                return 255;
            }
        }
 
        //隐藏屏幕键盘
        public static void HideInputPanel()
        {
            IntPtr TouchhWnd = new IntPtr(0);
            TouchhWnd = FindWindow("IPTip_Main_Window", null);
            if (TouchhWnd == IntPtr.Zero)
                return;
            PostMessage(TouchhWnd, WM_SYSCOMMAND, SC_CLOSE, 0);
        }