Индикатор раскладки

[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern SafeFileHandle CreateFile(
    [MarshalAs(UnmanagedType.LPTStr)] string filename,
    [MarshalAs(UnmanagedType.U4)] FileAccess access,
    [MarshalAs(UnmanagedType.U4)] FileShare share,
    IntPtr securityAttributes, // optional SECURITY_ATTRIBUTES struct or IntPtr.Zero
    [MarshalAs(UnmanagedType.U4)] FileMode creationDisposition,
    [MarshalAs(UnmanagedType.U4)] FileAttributes flagsAndAttributes,
    IntPtr templateFile
);
 
[DllImport("Kernel32.dll", SetLastError = false, CharSet = CharSet.Auto)]
static extern bool DeviceIoControl(
    Microsoft.Win32.SafeHandles.SafeFileHandle hDevice,
    uint IoControlCode,
    [In] ref KeyboardIndicatorParameters InBuffer,
    uint nInBufferSize,
    [MarshalAs(UnmanagedType.AsAny)]
    [Out] object OutBuffer,
    uint nOutBufferSize,
    out uint pBytesReturned,
    IntPtr lpOverlapped
);

using Microsoft.Win32.SafeHandles;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
 
namespace ConsoleApp1
{
    class Program
    {
        static uint ControlCode(uint deviceType, uint function, uint method, uint access)
        {
            return ((deviceType) << 16) | ((access) << 14) | ((function) << 2) | (method);
        }
        private static uint IOCTL_KEYBOARD_SET_INDICATORS = ControlCode(FileDeviceKeyboard, 0x0002, MethodBuffered, FileAnyAccess);
        private const uint FileAnyAccess = 0;
        private const uint MethodBuffered = 0;
        private const uint FileDeviceKeyboard = 0x0000000b;
        private const int DddRawTargetPath = 0x00000001;
 
        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        public static extern SafeFileHandle CreateFile(
     [MarshalAs(UnmanagedType.LPTStr)] string filename,
     [MarshalAs(UnmanagedType.U4)] FileAccess access,
     [MarshalAs(UnmanagedType.U4)] FileShare share,
     IntPtr securityAttributes, // optional SECURITY_ATTRIBUTES struct or IntPtr.Zero
     [MarshalAs(UnmanagedType.U4)] FileMode creationDisposition,
     [MarshalAs(UnmanagedType.U4)] FileAttributes flagsAndAttributes,
     IntPtr templateFile
 );
        [DllImport("Kernel32.dll", SetLastError = false, CharSet = CharSet.Auto)]
        static extern bool DeviceIoControl(
            Microsoft.Win32.SafeHandles.SafeFileHandle hDevice,
            uint IoControlCode,
            [In] ref KeyboardIndicatorParameters InBuffer,
            uint nInBufferSize,
            [MarshalAs(UnmanagedType.AsAny)]
    [Out] object OutBuffer,
            uint nOutBufferSize,
            out uint pBytesReturned,
            IntPtr lpOverlapped
        );
 
        [DllImport("kernel32.dll")]
        static extern bool DefineDosDevice(uint dwFlags, string lpDeviceName, string lpTargetPath);       
        public static void ToggleLights(Locks locks)
        {
            DefineDosDevice(DddRawTargetPath, "keyboard", "\\Device\\KeyboardClass0");
 
            var indicators = new KeyboardIndicatorParameters();
 
            using (var hKeybd = CreateFile("\\\\.\\keyboard", FileAccess.Write, 0, IntPtr.Zero, FileMode.Open, 0, IntPtr.Zero))
            {
                indicators.UnitId = 0;
                indicators.LedFlags = locks;
 
                var size = Marshal.SizeOf(typeof(KeyboardIndicatorParameters));
 
                uint bytesReturned;
                DeviceIoControl(hKeybd, IOCTL_KEYBOARD_SET_INDICATORS, ref indicators, (uint)size,
                    IntPtr.Zero, 0, out bytesReturned, IntPtr.Zero);
            }
        }
 
        public void OnKeyPress()
        {
 
            //this.KeyPress += new KeyPressEventHandler(key_Down);
 
        }
        struct KeyboardIndicatorParameters
        {
            public ushort UnitId;
            public Locks LedFlags;
        }
 
        [Flags]
        public enum Locks : ushort
        {
            None = 0,
            KeyboardScrollLockOn = 1,
            KeyboardNumLockOn = 2,
            KeyboardCapsLockOn = 4
        }
        [DllImport("user32.dll")]
        public static extern bool RegisterHotKey(IntPtr hWnd, int id, int fsModifiers, int vlc);
        [DllImport("user32.dll")]
        public static extern bool UnregisterHotKey(IntPtr hWnd, int id);
 
        const int MYACTION_HOTKEY_ID = 1;
        [DllImport("user32.dll", SetLastError = true)]
        static extern int GetWindowThreadProcessId(
                    [In] IntPtr hWnd,
                    [Out, Optional] IntPtr lpdwProcessId
                    );
 
        [DllImport("user32.dll", SetLastError = true)]
        static extern IntPtr GetForegroundWindow();
 
        [DllImport("user32.dll", SetLastError = true)]
        static extern ushort GetKeyboardLayout(
            [In] int idThread
            );
 
        /// <summary>
        /// Вернёт Id раскладки.
        /// </summary>
        ushort GetKeyboardLayout()
        {
            return GetKeyboardLayout(GetWindowThreadProcessId(GetForegroundWindow(), IntPtr.Zero));
        }
        static void Main(string[] args)
        {
            Program p = new Program();
            ushort u= p.GetKeyboardLayout();
            Console.WriteLine(u);
           // Environment.
            // Modifier keys codes: Alt = 1, Ctrl = 2, Shift = 4, Win = 8
            // Compute the addition of each combination of the keys you want to be pressed
            // ALT+CTRL = 1 + 2 = 3 , CTRL+SHIFT = 2 + 4 = 6...
            ToggleLights(Locks.KeyboardScrollLockOn);                   
 
        }
    }
}

        [DllImport("user32.dll", SetLastError = true)]
        static extern IntPtr GetKeyboardLayout(
            [In] int idThread
            );
 
        /// <summary>
        /// Вернёт Id раскладки.
        /// </summary>
        ushort GetKeyboardLayout()
        {
            IntPtr layout = GetKeyboardLayout(GetWindowThreadProcessId(GetForegroundWindow(), IntPtr.Zero));
            return (ushort)layout.ToInt32();
        }

Application.Run();