C# monitor keyboard and print pressed key

using System;

using System.Windows.Forms;

using System.Runtime.InteropServices;

using System.Diagnostics;

namespace ConsoleApplication3

{

    class MonitorHelper

    {

        internal const int WHKEYBOARDLLValue = ;

        internal const int WMKEYDOWNValue = 0x0100;

        internal static LowLevelKeyboardProc procValue = HookCallback;

        internal static IntPtr hookIDValue = IntPtr.Zero;

        internal delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);

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

        internal static extern IntPtr SetWindowsHookEx(int idHook, LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);

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

        [return: MarshalAs(UnmanagedType.Bool)]

        internal static extern bool UnhookWindowsHookEx(IntPtr hhk);

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

        internal static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);

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

        internal static extern IntPtr GetModuleHandle(string lpModuleName);

        internal static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)

        {

            if (nCode >=  && wParam == (IntPtr)WMKEYDOWNValue)

            {

                int vkCode = Marshal.ReadInt32(lParam);

                Console.WriteLine((Keys)vkCode);

            }

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

        }

        internal static IntPtr SetHook(LowLevelKeyboardProc proc)

        {

            using (Process curProcess = Process.GetCurrentProcess())

            using (ProcessModule curModule = curProcess.MainModule)

            {

                return SetWindowsHookEx(WHKEYBOARDLLValue, proc,

                    GetModuleHandle(curModule.ModuleName), );

            }

        }

    }

}

using System.Windows.Forms;

 static void Main(string[] args)

        {

            MonitorDemo();

            Console.ReadLine();

        }

        static void MonitorDemo()

        {

            MonitorHelper.hookIDValue = MonitorHelper.SetHook(MonitorHelper.procValue);

            Application.Run();

            MonitorHelper.UnhookWindowsHookEx(MonitorHelper.hookIDValue);

        }

referenced https://stackoverflow.com/questions/604410/global-keyboard-capture-in-c-sharp-application

#region Assembly System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089

// C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.2\System.Windows.Forms.dll

#endregion

using System.ComponentModel;

using System.Runtime.InteropServices;

namespace System.Windows.Forms

{

    //

    // Summary:

    //     Specifies key codes and modifiers.

    [ComVisible(true)]

    [Editor("System.Windows.Forms.Design.ShortcutKeysEditor, System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", typeof(Drawing.Design.UITypeEditor))]

    [Flags]

    [TypeConverter(typeof(KeysConverter))]

    public enum Keys

    {

        //

        // Summary:

        //     The bitmask to extract modifiers from a key value.

        Modifiers = -,

        //

        // Summary:

        //     No key pressed.

        None = ,

        //

        // Summary:

        //     The left mouse button.

        LButton = ,

        //

        // Summary:

        //     The right mouse button.

        RButton = ,

        //

        // Summary:

        //     The CANCEL key.

        Cancel = ,

        //

        // Summary:

        //     The middle mouse button (three-button mouse).

        MButton = ,

        //

        // Summary:

        //     The first x mouse button (five-button mouse).

        XButton1 = ,

        //

        // Summary:

        //     The second x mouse button (five-button mouse).

        XButton2 = ,

        //

        // Summary:

        //     The BACKSPACE key.

        Back = ,

        //

        // Summary:

        //     The TAB key.

        Tab = ,

        //

        // Summary:

        //     The LINEFEED key.

        LineFeed = ,

        //

        // Summary:

        //     The CLEAR key.

        Clear = ,

        //

        // Summary:

        //     The RETURN key.

        Return = ,

        //

        // Summary:

        //     The ENTER key.

        Enter = ,

        //

        // Summary:

        //     The SHIFT key.

        ShiftKey = ,

        //

        // Summary:

        //     The CTRL key.

        ControlKey = ,

        //

        // Summary:

        //     The ALT key.

        Menu = ,

        //

        // Summary:

        //     The PAUSE key.

        Pause = ,

        //

        // Summary:

        //     The CAPS LOCK key.

        Capital = ,

        //

        // Summary:

        //     The CAPS LOCK key.

        CapsLock = ,

        //

        // Summary:

        //     The IME Kana mode key.

        KanaMode = ,

        //

        // Summary:

        //     The IME Hanguel mode key. (maintained for compatibility; use HangulMode)

        HanguelMode = ,

        //

        // Summary:

        //     The IME Hangul mode key.

        HangulMode = ,

        //

        // Summary:

        //     The IME Junja mode key.

        JunjaMode = ,

        //

        // Summary:

        //     The IME final mode key.

        FinalMode = ,

        //

        // Summary:

        //     The IME Hanja mode key.

        HanjaMode = ,

        //

        // Summary:

        //     The IME Kanji mode key.

        KanjiMode = ,

        //

        // Summary:

        //     The ESC key.

        Escape = ,

        //

        // Summary:

        //     The IME convert key.

        IMEConvert = ,

        //

        // Summary:

        //     The IME nonconvert key.

        IMENonconvert = ,

        //

        // Summary:

        //     The IME accept key, replaces System.Windows.Forms.Keys.IMEAceept.

        IMEAccept = ,

        //

        // Summary:

        //     The IME accept key. Obsolete, use System.Windows.Forms.Keys.IMEAccept instead.

        IMEAceept = ,

        //

        // Summary:

        //     The IME mode change key.

        IMEModeChange = ,

        //

        // Summary:

        //     The SPACEBAR key.

        Space = ,

        //

        // Summary:

        //     The PAGE UP key.

        Prior = ,

        //

        // Summary:

        //     The PAGE UP key.

        PageUp = ,

        //

        // Summary:

        //     The PAGE DOWN key.

        Next = ,

        //

        // Summary:

        //     The PAGE DOWN key.

        PageDown = ,

        //

        // Summary:

        //     The END key.

        End = ,

        //

        // Summary:

        //     The HOME key.

        Home = ,

        //

        // Summary:

        //     The LEFT ARROW key.

        Left = ,

        //

        // Summary:

        //     The UP ARROW key.

        Up = ,

        //

        // Summary:

        //     The RIGHT ARROW key.

        Right = ,

        //

        // Summary:

        //     The DOWN ARROW key.

        Down = ,

        //

        // Summary:

        //     The SELECT key.

        Select = ,

        //

        // Summary:

        //     The PRINT key.

        Print = ,

        //

        // Summary:

        //     The EXECUTE key.

        Execute = ,

        //

        // Summary:

        //     The PRINT SCREEN key.

        Snapshot = ,

        //

        // Summary:

        //     The PRINT SCREEN key.

        PrintScreen = ,

        //

        // Summary:

        //     The INS key.

        Insert = ,

        //

        // Summary:

        //     The DEL key.

        Delete = ,

        //

        // Summary:

        //     The HELP key.

        Help = ,

        //

        // Summary:

        //     The 0 key.

        D0 = ,

        //

        // Summary:

        //     The 1 key.

        D1 = ,

        //

        // Summary:

        //     The 2 key.

        D2 = ,

        //

        // Summary:

        //     The 3 key.

        D3 = ,

        //

        // Summary:

        //     The 4 key.

        D4 = ,

        //

        // Summary:

        //     The 5 key.

        D5 = ,

        //

        // Summary:

        //     The 6 key.

        D6 = ,

        //

        // Summary:

        //     The 7 key.

        D7 = ,

        //

        // Summary:

        //     The 8 key.

        D8 = ,

        //

        // Summary:

        //     The 9 key.

        D9 = ,

        //

        // Summary:

        //     The A key.

        A = ,

        //

        // Summary:

        //     The B key.

        B = ,

        //

        // Summary:

        //     The C key.

        C = ,

        //

        // Summary:

        //     The D key.

        D = ,

        //

        // Summary:

        //     The E key.

        E = ,

        //

        // Summary:

        //     The F key.

        F = ,

        //

        // Summary:

        //     The G key.

        G = ,

        //

        // Summary:

        //     The H key.

        H = ,

        //

        // Summary:

        //     The I key.

        I = ,

        //

        // Summary:

        //     The J key.

        J = ,

        //

        // Summary:

        //     The K key.

        K = ,

        //

        // Summary:

        //     The L key.

        L = ,

        //

        // Summary:

        //     The M key.

        M = ,

        //

        // Summary:

        //     The N key.

        N = ,

        //

        // Summary:

        //     The O key.

        O = ,

        //

        // Summary:

        //     The P key.

        P = ,

        //

        // Summary:

        //     The Q key.

        Q = ,

        //

        // Summary:

        //     The R key.

        R = ,

        //

        // Summary:

        //     The S key.

        S = ,

        //

        // Summary:

        //     The T key.

        T = ,

        //

        // Summary:

        //     The U key.

        U = ,

        //

        // Summary:

        //     The V key.

        V = ,

        //

        // Summary:

        //     The W key.

        W = ,

        //

        // Summary:

        //     The X key.

        X = ,

        //

        // Summary:

        //     The Y key.

        Y = ,

        //

        // Summary:

        //     The Z key.

        Z = ,

        //

        // Summary:

        //     The left Windows logo key (Microsoft Natural Keyboard).

        LWin = ,

        //

        // Summary:

        //     The right Windows logo key (Microsoft Natural Keyboard).

        RWin = ,

        //

        // Summary:

        //     The application key (Microsoft Natural Keyboard).

        Apps = ,

        //

        // Summary:

        //     The computer sleep key.

        Sleep = ,

        //

        // Summary:

        //     The 0 key on the numeric keypad.

        NumPad0 = ,

        //

        // Summary:

        //     The 1 key on the numeric keypad.

        NumPad1 = ,

        //

        // Summary:

        //     The 2 key on the numeric keypad.

        NumPad2 = ,

        //

        // Summary:

        //     The 3 key on the numeric keypad.

        NumPad3 = ,

        //

        // Summary:

        //     The 4 key on the numeric keypad.

        NumPad4 = ,

        //

        // Summary:

        //     The 5 key on the numeric keypad.

        NumPad5 = ,

        //

        // Summary:

        //     The 6 key on the numeric keypad.

        NumPad6 = ,

        //

        // Summary:

        //     The 7 key on the numeric keypad.

        NumPad7 = ,

        //

        // Summary:

        //     The 8 key on the numeric keypad.

        NumPad8 = ,

        //

        // Summary:

        //     The 9 key on the numeric keypad.

        NumPad9 = ,

        //

        // Summary:

        //     The multiply key.

        Multiply = ,

        //

        // Summary:

        //     The add key.

        Add = ,

        //

        // Summary:

        //     The separator key.

        Separator = ,

        //

        // Summary:

        //     The subtract key.

        Subtract = ,

        //

        // Summary:

        //     The decimal key.

        Decimal = ,

        //

        // Summary:

        //     The divide key.

        Divide = ,

        //

        // Summary:

        //     The F1 key.

        F1 = ,

        //

        // Summary:

        //     The F2 key.

        F2 = ,

        //

        // Summary:

        //     The F3 key.

        F3 = ,

        //

        // Summary:

        //     The F4 key.

        F4 = ,

        //

        // Summary:

        //     The F5 key.

        F5 = ,

        //

        // Summary:

        //     The F6 key.

        F6 = ,

        //

        // Summary:

        //     The F7 key.

        F7 = ,

        //

        // Summary:

        //     The F8 key.

        F8 = ,

        //

        // Summary:

        //     The F9 key.

        F9 = ,

        //

        // Summary:

        //     The F10 key.

        F10 = ,

        //

        // Summary:

        //     The F11 key.

        F11 = ,

        //

        // Summary:

        //     The F12 key.

        F12 = ,

        //

        // Summary:

        //     The F13 key.

        F13 = ,

        //

        // Summary:

        //     The F14 key.

        F14 = ,

        //

        // Summary:

        //     The F15 key.

        F15 = ,

        //

        // Summary:

        //     The F16 key.

        F16 = ,

        //

        // Summary:

        //     The F17 key.

        F17 = ,

        //

        // Summary:

        //     The F18 key.

        F18 = ,

        //

        // Summary:

        //     The F19 key.

        F19 = ,

        //

        // Summary:

        //     The F20 key.

        F20 = ,

        //

        // Summary:

        //     The F21 key.

        F21 = ,

        //

        // Summary:

        //     The F22 key.

        F22 = ,

        //

        // Summary:

        //     The F23 key.

        F23 = ,

        //

        // Summary:

        //     The F24 key.

        F24 = ,

        //

        // Summary:

        //     The NUM LOCK key.

        NumLock = ,

        //

        // Summary:

        //     The SCROLL LOCK key.

        Scroll = ,

        //

        // Summary:

        //     The left SHIFT key.

        LShiftKey = ,

        //

        // Summary:

        //     The right SHIFT key.

        RShiftKey = ,

        //

        // Summary:

        //     The left CTRL key.

        LControlKey = ,

        //

        // Summary:

        //     The right CTRL key.

        RControlKey = ,

        //

        // Summary:

        //     The left ALT key.

        LMenu = ,

        //

        // Summary:

        //     The right ALT key.

        RMenu = ,

        //

        // Summary:

        //     The browser back key (Windows 2000 or later).

        BrowserBack = ,

        //

        // Summary:

        //     The browser forward key (Windows 2000 or later).

        BrowserForward = ,

        //

        // Summary:

        //     The browser refresh key (Windows 2000 or later).

        BrowserRefresh = ,

        //

        // Summary:

        //     The browser stop key (Windows 2000 or later).

        BrowserStop = ,

        //

        // Summary:

        //     The browser search key (Windows 2000 or later).

        BrowserSearch = ,

        //

        // Summary:

        //     The browser favorites key (Windows 2000 or later).

        BrowserFavorites = ,

        //

        // Summary:

        //     The browser home key (Windows 2000 or later).

        BrowserHome = ,

        //

        // Summary:

        //     The volume mute key (Windows 2000 or later).

        VolumeMute = ,

        //

        // Summary:

        //     The volume down key (Windows 2000 or later).

        VolumeDown = ,

        //

        // Summary:

        //     The volume up key (Windows 2000 or later).

        VolumeUp = ,

        //

        // Summary:

        //     The media next track key (Windows 2000 or later).

        MediaNextTrack = ,

        //

        // Summary:

        //     The media previous track key (Windows 2000 or later).

        MediaPreviousTrack = ,

        //

        // Summary:

        //     The media Stop key (Windows 2000 or later).

        MediaStop = ,

        //

        // Summary:

        //     The media play pause key (Windows 2000 or later).

        MediaPlayPause = ,

        //

        // Summary:

        //     The launch mail key (Windows 2000 or later).

        LaunchMail = ,

        //

        // Summary:

        //     The select media key (Windows 2000 or later).

        SelectMedia = ,

        //

        // Summary:

        //     The start application one key (Windows 2000 or later).

        LaunchApplication1 = ,

        //

        // Summary:

        //     The start application two key (Windows 2000 or later).

        LaunchApplication2 = ,

        //

        // Summary:

        //     The OEM Semicolon key on a US standard keyboard (Windows 2000 or later).

        OemSemicolon = ,

        //

        // Summary:

        //     The OEM 1 key.

        Oem1 = ,

        //

        // Summary:

        //     The OEM plus key on any country/region keyboard (Windows 2000 or later).

        Oemplus = ,

        //

        // Summary:

        //     The OEM comma key on any country/region keyboard (Windows 2000 or later).

        Oemcomma = ,

        //

        // Summary:

        //     The OEM minus key on any country/region keyboard (Windows 2000 or later).

        OemMinus = ,

        //

        // Summary:

        //     The OEM period key on any country/region keyboard (Windows 2000 or later).

        OemPeriod = ,

        //

        // Summary:

        //     The OEM question mark key on a US standard keyboard (Windows 2000 or later).

        OemQuestion = ,

        //

        // Summary:

        //     The OEM 2 key.

        Oem2 = ,

        //

        // Summary:

        //     The OEM tilde key on a US standard keyboard (Windows 2000 or later).

        Oemtilde = ,

        //

        // Summary:

        //     The OEM 3 key.

        Oem3 = ,

        //

        // Summary:

        //     The OEM open bracket key on a US standard keyboard (Windows 2000 or later).

        OemOpenBrackets = ,

        //

        // Summary:

        //     The OEM 4 key.

        Oem4 = ,

        //

        // Summary:

        //     The OEM pipe key on a US standard keyboard (Windows 2000 or later).

        OemPipe = ,

        //

        // Summary:

        //     The OEM 5 key.

        Oem5 = ,

        //

        // Summary:

        //     The OEM close bracket key on a US standard keyboard (Windows 2000 or later).

        OemCloseBrackets = ,

        //

        // Summary:

        //     The OEM 6 key.

        Oem6 = ,

        //

        // Summary:

        //     The OEM singled/double quote key on a US standard keyboard (Windows 2000 or later).

        OemQuotes = ,

        //

        // Summary:

        //     The OEM 7 key.

        Oem7 = ,

        //

        // Summary:

        //     The OEM 8 key.

        Oem8 = ,

        //

        // Summary:

        //     The OEM angle bracket or backslash key on the RT 102 key keyboard (Windows 2000

        //     or later).

        OemBackslash = ,

        //

        // Summary:

        //     The OEM 102 key.

        Oem102 = ,

        //

        // Summary:

        //     The PROCESS KEY key.

        ProcessKey = ,

        //

        // Summary:

        //     Used to pass Unicode characters as if they were keystrokes. The Packet key value

        //     is the low word of a 32-bit virtual-key value used for non-keyboard input methods.

        Packet = ,

        //

        // Summary:

        //     The ATTN key.

        Attn = ,

        //

        // Summary:

        //     The CRSEL key.

        Crsel = ,

        //

        // Summary:

        //     The EXSEL key.

        Exsel = ,

        //

        // Summary:

        //     The ERASE EOF key.

        EraseEof = ,

        //

        // Summary:

        //     The PLAY key.

        Play = ,

        //

        // Summary:

        //     The ZOOM key.

        Zoom = ,

        //

        // Summary:

        //     A constant reserved for future use.

        NoName = ,

        //

        // Summary:

        //     The PA1 key.

        Pa1 = ,

        //

        // Summary:

        //     The CLEAR key.

        OemClear = ,

        //

        // Summary:

        //     The bitmask to extract a key code from a key value.

        KeyCode = ,

        //

        // Summary:

        //     The SHIFT modifier key.

        Shift = ,

        //

        // Summary:

        //     The CTRL modifier key.

        Control = ,

        //

        // Summary:

        //     The ALT modifier key.

        Alt =

    }

}

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