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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);        }

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