[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);

 

 

        private static void KillTabTip()

        {

            // Kill the previous process so the registry change will take effect.

            var processlist = Process.GetProcesses();

 

            foreach (var process in processlist.Where(process => process.ProcessName == "TabTip"))

            {

                process.Kill();

                break;

            }

        }

 

        public static void ShowTouchKeyboard(bool isVisible, bool numericKeyboard)

        {

            if (isVisible)

            {

                const string keyName = "HKEY_CURRENT_USER\\Software\\Microsoft\\TabletTip\\1.7";

 

                var regValue = http://www.mamicode.com/(int)Registry.GetValue(keyName,"KeyboardLayoutPreference", 0);

                var regShowNumericKeyboard = regValue =http://www.mamicode.com/= 1;

 

                // Note: Remove this if do not want to control docked state.

                var dockedRegValue = http://www.mamicode.com/(int)Registry.GetValue(keyName,"EdgeTargetDockedState", 1);

                var restoreDockedState = dockedRegValue =http://www.mamicode.com/= 0;

 

                if (numericKeyboard && regShowNumericKeyboard == false)

                {

                    // Set the registry so it will show the number pad via the thumb keyboard.

                    Registry.SetValue(keyName, "KeyboardLayoutPreference", 1, RegistryValueKind.DWord);

 

                    // Kill the previous process so the registry change will take effect.

                    KillTabTip();

                }

                else if (numericKeyboard == false && regShowNumericKeyboard)

                {

                    // Set the registry so it will NOT show the number pad via the thumb keyboard.

                    Registry.SetValue(keyName, "KeyboardLayoutPreference", 0, RegistryValueKind.DWord);

 

                    // Kill the previous process so the registry change will take effect.

                    KillTabTip();

                }

 

                // Note: Remove this if do not want to control docked state.

                if (restoreDockedState)

                {

                    // Set the registry so it will show as docked at the bottom rather than floating.

                    Registry.SetValue(keyName, "EdgeTargetDockedState", 1, RegistryValueKind.DWord);

 

                    // Kill the previous process so the registry change will take effect.

                    KillTabTip();

                }

 

                Process.Start("c:\\Program Files\\Common Files\\Microsoft Shared\\ink\\TabTip.exe");

            }

            else

            {

                var win8Version = new Version(6, 2, 9200, 0);

 

                if (Environment.OSVersion.Version >= win8Version)

                {

                    const int wmSyscommand = 274;

                    const uint scClose = 61536;

                    IntPtr keyboardWnd = FindWindow("IPTip_Main_Window", null);

                    PostMessage(keyboardWnd, wmSyscommand, (int)scClose, 0);

                }

            }

        }