src/ScreenGrab/OSInterop.cs

using System.Runtime.InteropServices;

internal static partial class OSInterop
{
    public delegate IntPtr HookProc(int nCode, IntPtr wParam, IntPtr lParam);

    public enum InputType : uint
    {
        INPUT_MOUSE,
        INPUT_KEYBOARD,
        INPUT_HARDWARE
    }

    public const int SM_CMONITORS = 80;

    public const int WH_KEYBOARD_LL = 13;
    public const int VK_SHIFT = 0x10;
    public const int VK_CONTROL = 0x11;
    public const int VK_MENU = 0x12;
    public const int VK_LWIN = 0x5B;
    public const int VK_RWIN = 0x5C;
    public const int VK_ESCAPE = 0x1B;
    public const int WM_HOTKEY = 0x0312;
    public const int WM_KEYDOWN = 0x0100;
    public const int WM_KEYUP = 0x0101;

    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    public static extern bool GetMonitorInfo(HandleRef hmonitor, [In] [Out] MONITORINFOEX info);

    [DllImport("user32.dll")]
    public static extern IntPtr MonitorFromWindow(HandleRef handle, int flags);
#if NET7_0_OR_GREATER
    [LibraryImport("user32.dll")]
    public static partial int GetSystemMetrics(int smIndex);

    [LibraryImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    public static partial bool SystemParametersInfo(int nAction, int nParam, ref RECT rc, int nUpdate);

    [LibraryImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    public static partial bool ClipCursor(ref RECT lpRect);
#else
    [DllImport("user32.dll", SetLastError = true)]
    public static extern int GetSystemMetrics(int smIndex);

    [DllImport("user32.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    public static extern bool SystemParametersInfo(int nAction, int nParam, ref RECT rc, int nUpdate);

    [DllImport("user32.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    public static extern bool ClipCursor(ref RECT lpRect);
#endif

    [DllImport("user32.dll")]
    public static extern bool ClipCursor([In] IntPtr lpRect);

    public struct RECT
    {
        public int left;
        public int top;
        public int right;
        public int bottom;
        public int width => right - left;
        public int height => bottom - top;
    }

    [StructLayout(LayoutKind.Sequential, Pack = 4, CharSet = CharSet.Auto)]
    public class MONITORINFOEX
    {
        public int cbSize = Marshal.SizeOf(typeof(MONITORINFOEX));
        public RECT rcMonitor = new();
        public RECT rcWork = new();

        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)]
        public char[] szDevice = new char[32];

        public int dwFlags;
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct INPUT
    {
        public InputType Type;
        public InputUnion U;

        public static int Size => Marshal.SizeOf(typeof(INPUT));
    }

    [StructLayout(LayoutKind.Explicit)]
    public struct InputUnion
    {
        [FieldOffset(0)] internal MOUSEINPUT Mi;
        [FieldOffset(0)] internal KEYBDINPUT Ki;
        [FieldOffset(0)] internal HARDWAREINPUT Hi;
    }

    [StructLayout(LayoutKind.Sequential)]
    internal struct MOUSEINPUT
    {
        internal int Dx;
        internal int Dy;
        internal int MouseData;
        internal MOUSEEVENTF DwFlags;
        internal uint Time;
        internal UIntPtr DwExtraInfo;
    }

    [Flags]
    internal enum MOUSEEVENTF : uint
    {
        ABSOLUTE = 0x8000,
        HWHEEL = 0x01000,
        MOVE = 0x0001,
        MOVE_NOCOALESCE = 0x2000,
        LEFTDOWN = 0x0002,
        LEFTUP = 0x0004,
        RIGHTDOWN = 0x0008,
        RIGHTUP = 0x0010,
        MIDDLEDOWN = 0x0020,
        MIDDLEUP = 0x0040,
        VIRTUALDESK = 0x4000,
        WHEEL = 0x0800,
        XDOWN = 0x0080,
        XUP = 0x0100
    }

    [StructLayout(LayoutKind.Sequential)]
    internal struct KEYBDINPUT
    {
        internal VirtualKeyShort WVk;
        internal ScanCodeShort WScan;
        internal KEYEVENTF DwFlags;
        internal int Time;
        internal UIntPtr DwExtraInfo;
    }

    [Flags]
    internal enum KEYEVENTF : uint
    {
        EXTENDEDKEY = 0x0001,
        KEYUP = 0x0002,
        SCANCODE = 0x0008,
        UNICODE = 0x0004
    }

    internal enum VirtualKeyShort : short
    {
        /// <summary>
        ///     Left mouse button
        /// </summary>
        LBUTTON = 0x01,

        /// <summary>
        ///     Right mouse button
        /// </summary>
        RBUTTON = 0x02,

        /// <summary>
        ///     Control-break processing
        /// </summary>
        CANCEL = 0x03,

        /// <summary>
        ///     Middle mouse button (three-button mouse)
        /// </summary>
        MBUTTON = 0x04,

        /// <summary>
        ///     Windows 2000/XP: X1 mouse button
        /// </summary>
        XBUTTON1 = 0x05,

        /// <summary>
        ///     Windows 2000/XP: X2 mouse button
        /// </summary>
        XBUTTON2 = 0x06,

        /// <summary>
        ///     BACKSPACE key
        /// </summary>
        BACK = 0x08,

        /// <summary>
        ///     TAB key
        /// </summary>
        TAB = 0x09,

        /// <summary>
        ///     CLEAR key
        /// </summary>
        CLEAR = 0x0C,

        /// <summary>
        ///     ENTER key
        /// </summary>
        RETURN = 0x0D,

        /// <summary>
        ///     SHIFT key
        /// </summary>
        SHIFT = 0x10,

        /// <summary>
        ///     CTRL key
        /// </summary>
        CONTROL = 0x11,

        /// <summary>
        ///     ALT key
        /// </summary>
        MENU = 0x12,

        /// <summary>
        ///     PAUSE key
        /// </summary>
        PAUSE = 0x13,

        /// <summary>
        ///     CAPS LOCK key
        /// </summary>
        CAPITAL = 0x14,

        /// <summary>
        ///     Input Method Editor (IME) Kana mode
        /// </summary>
        KANA = 0x15,

        /// <summary>
        ///     IME Hangul mode
        /// </summary>
        HANGUL = 0x15,

        /// <summary>
        ///     IME Junja mode
        /// </summary>
        JUNJA = 0x17,

        /// <summary>
        ///     IME final mode
        /// </summary>
        FINAL = 0x18,

        /// <summary>
        ///     IME Hanja mode
        /// </summary>
        HANJA = 0x19,

        /// <summary>
        ///     IME Kanji mode
        /// </summary>
        KANJI = 0x19,

        /// <summary>
        ///     ESC key
        /// </summary>
        ESCAPE = 0x1B,

        /// <summary>
        ///     IME convert
        /// </summary>
        CONVERT = 0x1C,

        /// <summary>
        ///     IME nonconvert
        /// </summary>
        NONCONVERT = 0x1D,

        /// <summary>
        ///     IME accept
        /// </summary>
        ACCEPT = 0x1E,

        /// <summary>
        ///     IME mode change request
        /// </summary>
        MODECHANGE = 0x1F,

        /// <summary>
        ///     SPACEBAR
        /// </summary>
        SPACE = 0x20,

        /// <summary>
        ///     PAGE UP key
        /// </summary>
        PRIOR = 0x21,

        /// <summary>
        ///     PAGE DOWN key
        /// </summary>
        NEXT = 0x22,

        /// <summary>
        ///     END key
        /// </summary>
        END = 0x23,

        /// <summary>
        ///     HOME key
        /// </summary>
        HOME = 0x24,

        /// <summary>
        ///     LEFT ARROW key
        /// </summary>
        LEFT = 0x25,

        /// <summary>
        ///     UP ARROW key
        /// </summary>
        UP = 0x26,

        /// <summary>
        ///     RIGHT ARROW key
        /// </summary>
        RIGHT = 0x27,

        /// <summary>
        ///     DOWN ARROW key
        /// </summary>
        DOWN = 0x28,

        /// <summary>
        ///     SELECT key
        /// </summary>
        SELECT = 0x29,

        /// <summary>
        ///     PRINT key
        /// </summary>
        PRINT = 0x2A,

        /// <summary>
        ///     EXECUTE key
        /// </summary>
        EXECUTE = 0x2B,

        /// <summary>
        ///     PRINT SCREEN key
        /// </summary>
        SNAPSHOT = 0x2C,

        /// <summary>
        ///     INS key
        /// </summary>
        INSERT = 0x2D,

        /// <summary>
        ///     DEL key
        /// </summary>
        DELETE = 0x2E,

        /// <summary>
        ///     HELP key
        /// </summary>
        HELP = 0x2F,

        /// <summary>
        ///     0 key
        /// </summary>
        KEY_0 = 0x30,

        /// <summary>
        ///     1 key
        /// </summary>
        KEY_1 = 0x31,

        /// <summary>
        ///     2 key
        /// </summary>
        KEY_2 = 0x32,

        /// <summary>
        ///     3 key
        /// </summary>
        KEY_3 = 0x33,

        /// <summary>
        ///     4 key
        /// </summary>
        KEY_4 = 0x34,

        /// <summary>
        ///     5 key
        /// </summary>
        KEY_5 = 0x35,

        /// <summary>
        ///     6 key
        /// </summary>
        KEY_6 = 0x36,

        /// <summary>
        ///     7 key
        /// </summary>
        KEY_7 = 0x37,

        /// <summary>
        ///     8 key
        /// </summary>
        KEY_8 = 0x38,

        /// <summary>
        ///     9 key
        /// </summary>
        KEY_9 = 0x39,

        /// <summary>
        ///     A key
        /// </summary>
        KEY_A = 0x41,

        /// <summary>
        ///     B key
        /// </summary>
        KEY_B = 0x42,

        /// <summary>
        ///     C key
        /// </summary>
        KEY_C = 0x43,

        /// <summary>
        ///     D key
        /// </summary>
        KEY_D = 0x44,

        /// <summary>
        ///     E key
        /// </summary>
        KEY_E = 0x45,

        /// <summary>
        ///     F key
        /// </summary>
        KEY_F = 0x46,

        /// <summary>
        ///     G key
        /// </summary>
        KEY_G = 0x47,

        /// <summary>
        ///     H key
        /// </summary>
        KEY_H = 0x48,

        /// <summary>
        ///     I key
        /// </summary>
        KEY_I = 0x49,

        /// <summary>
        ///     J key
        /// </summary>
        KEY_J = 0x4A,

        /// <summary>
        ///     K key
        /// </summary>
        KEY_K = 0x4B,

        /// <summary>
        ///     L key
        /// </summary>
        KEY_L = 0x4C,

        /// <summary>
        ///     M key
        /// </summary>
        KEY_M = 0x4D,

        /// <summary>
        ///     N key
        /// </summary>
        KEY_N = 0x4E,

        /// <summary>
        ///     O key
        /// </summary>
        KEY_O = 0x4F,

        /// <summary>
        ///     P key
        /// </summary>
        KEY_P = 0x50,

        /// <summary>
        ///     Q key
        /// </summary>
        KEY_Q = 0x51,

        /// <summary>
        ///     R key
        /// </summary>
        KEY_R = 0x52,

        /// <summary>
        ///     S key
        /// </summary>
        KEY_S = 0x53,

        /// <summary>
        ///     T key
        /// </summary>
        KEY_T = 0x54,

        /// <summary>
        ///     U key
        /// </summary>
        KEY_U = 0x55,

        /// <summary>
        ///     V key
        /// </summary>
        KEY_V = 0x56,

        /// <summary>
        ///     W key
        /// </summary>
        KEY_W = 0x57,

        /// <summary>
        ///     X key
        /// </summary>
        KEY_X = 0x58,

        /// <summary>
        ///     Y key
        /// </summary>
        KEY_Y = 0x59,

        /// <summary>
        ///     Z key
        /// </summary>
        KEY_Z = 0x5A,

        /// <summary>
        ///     Left Windows key (Microsoft Natural keyboard)
        /// </summary>
        LWIN = 0x5B,

        /// <summary>
        ///     Right Windows key (Natural keyboard)
        /// </summary>
        RWIN = 0x5C,

        /// <summary>
        ///     Applications key (Natural keyboard)
        /// </summary>
        APPS = 0x5D,

        /// <summary>
        ///     Computer Sleep key
        /// </summary>
        SLEEP = 0x5F,

        /// <summary>
        ///     Numeric keypad 0 key
        /// </summary>
        NUMPAD0 = 0x60,

        /// <summary>
        ///     Numeric keypad 1 key
        /// </summary>
        NUMPAD1 = 0x61,

        /// <summary>
        ///     Numeric keypad 2 key
        /// </summary>
        NUMPAD2 = 0x62,

        /// <summary>
        ///     Numeric keypad 3 key
        /// </summary>
        NUMPAD3 = 0x63,

        /// <summary>
        ///     Numeric keypad 4 key
        /// </summary>
        NUMPAD4 = 0x64,

        /// <summary>
        ///     Numeric keypad 5 key
        /// </summary>
        NUMPAD5 = 0x65,

        /// <summary>
        ///     Numeric keypad 6 key
        /// </summary>
        NUMPAD6 = 0x66,

        /// <summary>
        ///     Numeric keypad 7 key
        /// </summary>
        NUMPAD7 = 0x67,

        /// <summary>
        ///     Numeric keypad 8 key
        /// </summary>
        NUMPAD8 = 0x68,

        /// <summary>
        ///     Numeric keypad 9 key
        /// </summary>
        NUMPAD9 = 0x69,

        /// <summary>
        ///     Multiply key
        /// </summary>
        MULTIPLY = 0x6A,

        /// <summary>
        ///     Add key
        /// </summary>
        ADD = 0x6B,

        /// <summary>
        ///     Separator key
        /// </summary>
        SEPARATOR = 0x6C,

        /// <summary>
        ///     Subtract key
        /// </summary>
        SUBTRACT = 0x6D,

        /// <summary>
        ///     Decimal key
        /// </summary>
        DECIMAL = 0x6E,

        /// <summary>
        ///     Divide key
        /// </summary>
        DIVIDE = 0x6F,

        /// <summary>
        ///     F1 key
        /// </summary>
        F1 = 0x70,

        /// <summary>
        ///     F2 key
        /// </summary>
        F2 = 0x71,

        /// <summary>
        ///     F3 key
        /// </summary>
        F3 = 0x72,

        /// <summary>
        ///     F4 key
        /// </summary>
        F4 = 0x73,

        /// <summary>
        ///     F5 key
        /// </summary>
        F5 = 0x74,

        /// <summary>
        ///     F6 key
        /// </summary>
        F6 = 0x75,

        /// <summary>
        ///     F7 key
        /// </summary>
        F7 = 0x76,

        /// <summary>
        ///     F8 key
        /// </summary>
        F8 = 0x77,

        /// <summary>
        ///     F9 key
        /// </summary>
        F9 = 0x78,

        /// <summary>
        ///     F10 key
        /// </summary>
        F10 = 0x79,

        /// <summary>
        ///     F11 key
        /// </summary>
        F11 = 0x7A,

        /// <summary>
        ///     F12 key
        /// </summary>
        F12 = 0x7B,

        /// <summary>
        ///     F13 key
        /// </summary>
        F13 = 0x7C,

        /// <summary>
        ///     F14 key
        /// </summary>
        F14 = 0x7D,

        /// <summary>
        ///     F15 key
        /// </summary>
        F15 = 0x7E,

        /// <summary>
        ///     F16 key
        /// </summary>
        F16 = 0x7F,

        /// <summary>
        ///     F17 key
        /// </summary>
        F17 = 0x80,

        /// <summary>
        ///     F18 key
        /// </summary>
        F18 = 0x81,

        /// <summary>
        ///     F19 key
        /// </summary>
        F19 = 0x82,

        /// <summary>
        ///     F20 key
        /// </summary>
        F20 = 0x83,

        /// <summary>
        ///     F21 key
        /// </summary>
        F21 = 0x84,

        /// <summary>
        ///     F22 key, (PPC only) Key used to lock device.
        /// </summary>
        F22 = 0x85,

        /// <summary>
        ///     F23 key
        /// </summary>
        F23 = 0x86,

        /// <summary>
        ///     F24 key
        /// </summary>
        F24 = 0x87,

        /// <summary>
        ///     NUM LOCK key
        /// </summary>
        NUMLOCK = 0x90,

        /// <summary>
        ///     SCROLL LOCK key
        /// </summary>
        SCROLL = 0x91,

        /// <summary>
        ///     Left SHIFT key
        /// </summary>
        LSHIFT = 0xA0,

        /// <summary>
        ///     Right SHIFT key
        /// </summary>
        RSHIFT = 0xA1,

        /// <summary>
        ///     Left CONTROL key
        /// </summary>
        LCONTROL = 0xA2,

        /// <summary>
        ///     Right CONTROL key
        /// </summary>
        RCONTROL = 0xA3,

        /// <summary>
        ///     Left MENU key
        /// </summary>
        LMENU = 0xA4,

        /// <summary>
        ///     Right MENU key
        /// </summary>
        RMENU = 0xA5,

        /// <summary>
        ///     Windows 2000/XP: Browser Back key
        /// </summary>
        BROWSER_BACK = 0xA6,

        /// <summary>
        ///     Windows 2000/XP: Browser Forward key
        /// </summary>
        BROWSER_FORWARD = 0xA7,

        /// <summary>
        ///     Windows 2000/XP: Browser Refresh key
        /// </summary>
        BROWSER_REFRESH = 0xA8,

        /// <summary>
        ///     Windows 2000/XP: Browser Stop key
        /// </summary>
        BROWSER_STOP = 0xA9,

        /// <summary>
        ///     Windows 2000/XP: Browser Search key
        /// </summary>
        BROWSER_SEARCH = 0xAA,

        /// <summary>
        ///     Windows 2000/XP: Browser Favorites key
        /// </summary>
        BROWSER_FAVORITES = 0xAB,

        /// <summary>
        ///     Windows 2000/XP: Browser Start and Home key
        /// </summary>
        BROWSER_HOME = 0xAC,

        /// <summary>
        ///     Windows 2000/XP: Volume Mute key
        /// </summary>
        VOLUME_MUTE = 0xAD,

        /// <summary>
        ///     Windows 2000/XP: Volume Down key
        /// </summary>
        VOLUME_DOWN = 0xAE,

        /// <summary>
        ///     Windows 2000/XP: Volume Up key
        /// </summary>
        VOLUME_UP = 0xAF,

        /// <summary>
        ///     Windows 2000/XP: Next Track key
        /// </summary>
        MEDIA_NEXT_TRACK = 0xB0,

        /// <summary>
        ///     Windows 2000/XP: Previous Track key
        /// </summary>
        MEDIA_PREV_TRACK = 0xB1,

        /// <summary>
        ///     Windows 2000/XP: Stop Media key
        /// </summary>
        MEDIA_STOP = 0xB2,

        /// <summary>
        ///     Windows 2000/XP: Play/Pause Media key
        /// </summary>
        MEDIA_PLAY_PAUSE = 0xB3,

        /// <summary>
        ///     Windows 2000/XP: Start Mail key
        /// </summary>
        LAUNCH_MAIL = 0xB4,

        /// <summary>
        ///     Windows 2000/XP: Select Media key
        /// </summary>
        LAUNCH_MEDIA_SELECT = 0xB5,

        /// <summary>
        ///     Windows 2000/XP: Start Application 1 key
        /// </summary>
        LAUNCH_APP1 = 0xB6,

        /// <summary>
        ///     Windows 2000/XP: Start Application 2 key
        /// </summary>
        LAUNCH_APP2 = 0xB7,

        /// <summary>
        ///     Used for miscellaneous characters; it can vary by keyboard.
        /// </summary>
        OEM_1 = 0xBA,

        /// <summary>
        ///     Windows 2000/XP: For any country/region, the '+' key
        /// </summary>
        OEM_PLUS = 0xBB,

        /// <summary>
        ///     Windows 2000/XP: For any country/region, the ',' key
        /// </summary>
        OEM_COMMA = 0xBC,

        /// <summary>
        ///     Windows 2000/XP: For any country/region, the '-' key
        /// </summary>
        OEM_MINUS = 0xBD,

        /// <summary>
        ///     Windows 2000/XP: For any country/region, the '.' key
        /// </summary>
        OEM_PERIOD = 0xBE,

        /// <summary>
        ///     Used for miscellaneous characters; it can vary by keyboard.
        /// </summary>
        OEM_2 = 0xBF,

        /// <summary>
        ///     Used for miscellaneous characters; it can vary by keyboard.
        /// </summary>
        OEM_3 = 0xC0,

        /// <summary>
        ///     Used for miscellaneous characters; it can vary by keyboard.
        /// </summary>
        OEM_4 = 0xDB,

        /// <summary>
        ///     Used for miscellaneous characters; it can vary by keyboard.
        /// </summary>
        OEM_5 = 0xDC,

        /// <summary>
        ///     Used for miscellaneous characters; it can vary by keyboard.
        /// </summary>
        OEM_6 = 0xDD,

        /// <summary>
        ///     Used for miscellaneous characters; it can vary by keyboard.
        /// </summary>
        OEM_7 = 0xDE,

        /// <summary>
        ///     Used for miscellaneous characters; it can vary by keyboard.
        /// </summary>
        OEM_8 = 0xDF,

        /// <summary>
        ///     Windows 2000/XP: Either the angle bracket key or the backslash key on the RT 102-key keyboard
        /// </summary>
        OEM_102 = 0xE2,

        /// <summary>
        ///     Windows 95/98/Me, Windows NT 4.0, Windows 2000/XP: IME PROCESS key
        /// </summary>
        PROCESSKEY = 0xE5,

        /// <summary>
        ///     Windows 2000/XP: Used to pass Unicode characters as if they were keystrokes.
        ///     The VK_PACKET key is the low word of a 32-bit Virtual Key value used for non-keyboard input methods. For more
        ///     information,
        ///     see Remark in KEYBDINPUT, SendInput, WM_KEYDOWN, and WM_KEYUP
        /// </summary>
        PACKET = 0xE7,

        /// <summary>
        ///     Attn key
        /// </summary>
        ATTN = 0xF6,

        /// <summary>
        ///     CrSel key
        /// </summary>
        CRSEL = 0xF7,

        /// <summary>
        ///     ExSel key
        /// </summary>
        EXSEL = 0xF8,

        /// <summary>
        ///     Erase EOF key
        /// </summary>
        EREOF = 0xF9,

        /// <summary>
        ///     Play key
        /// </summary>
        PLAY = 0xFA,

        /// <summary>
        ///     Zoom key
        /// </summary>
        ZOOM = 0xFB,

        /// <summary>
        ///     Reserved
        /// </summary>
        NONAME = 0xFC,

        /// <summary>
        ///     PA1 key
        /// </summary>
        PA1 = 0xFD,

        /// <summary>
        ///     Clear key
        /// </summary>
        OEM_CLEAR = 0xFE
    }

    internal enum ScanCodeShort : short
    {
        LBUTTON = 0,
        RBUTTON = 0,
        CANCEL = 70,
        MBUTTON = 0,
        XBUTTON1 = 0,
        XBUTTON2 = 0,
        BACK = 14,
        TAB = 15,
        CLEAR = 76,
        RETURN = 28,
        SHIFT = 42,
        CONTROL = 29,
        MENU = 56,
        PAUSE = 0,
        CAPITAL = 58,
        KANA = 0,
        HANGUL = 0,
        JUNJA = 0,
        FINAL = 0,
        HANJA = 0,
        KANJI = 0,
        ESCAPE = 1,
        CONVERT = 0,
        NONCONVERT = 0,
        ACCEPT = 0,
        MODECHANGE = 0,
        SPACE = 57,
        PRIOR = 73,
        NEXT = 81,
        END = 79,
        HOME = 71,
        LEFT = 75,
        UP = 72,
        RIGHT = 77,
        DOWN = 80,
        SELECT = 0,
        PRINT = 0,
        EXECUTE = 0,
        SNAPSHOT = 84,
        INSERT = 82,
        DELETE = 83,
        HELP = 99,
        KEY_0 = 11,
        KEY_1 = 2,
        KEY_2 = 3,
        KEY_3 = 4,
        KEY_4 = 5,
        KEY_5 = 6,
        KEY_6 = 7,
        KEY_7 = 8,
        KEY_8 = 9,
        KEY_9 = 10,
        KEY_A = 30,
        KEY_B = 48,
        KEY_C = 46,
        KEY_D = 32,
        KEY_E = 18,
        KEY_F = 33,
        KEY_G = 34,
        KEY_H = 35,
        KEY_I = 23,
        KEY_J = 36,
        KEY_K = 37,
        KEY_L = 38,
        KEY_M = 50,
        KEY_N = 49,
        KEY_O = 24,
        KEY_P = 25,
        KEY_Q = 16,
        KEY_R = 19,
        KEY_S = 31,
        KEY_T = 20,
        KEY_U = 22,
        KEY_V = 47,
        KEY_W = 17,
        KEY_X = 45,
        KEY_Y = 21,
        KEY_Z = 44,
        LWIN = 91,
        RWIN = 92,
        APPS = 93,
        SLEEP = 95,
        NUMPAD0 = 82,
        NUMPAD1 = 79,
        NUMPAD2 = 80,
        NUMPAD3 = 81,
        NUMPAD4 = 75,
        NUMPAD5 = 76,
        NUMPAD6 = 77,
        NUMPAD7 = 71,
        NUMPAD8 = 72,
        NUMPAD9 = 73,
        MULTIPLY = 55,
        ADD = 78,
        SEPARATOR = 0,
        SUBTRACT = 74,
        DECIMAL = 83,
        DIVIDE = 53,
        F1 = 59,
        F2 = 60,
        F3 = 61,
        F4 = 62,
        F5 = 63,
        F6 = 64,
        F7 = 65,
        F8 = 66,
        F9 = 67,
        F10 = 68,
        F11 = 87,
        F12 = 88,
        F13 = 100,
        F14 = 101,
        F15 = 102,
        F16 = 103,
        F17 = 104,
        F18 = 105,
        F19 = 106,
        F20 = 107,
        F21 = 108,
        F22 = 109,
        F23 = 110,
        F24 = 118,
        NUMLOCK = 69,
        SCROLL = 70,
        LSHIFT = 42,
        RSHIFT = 54,
        LCONTROL = 29,
        RCONTROL = 29,
        LMENU = 56,
        RMENU = 56,
        BROWSER_BACK = 106,
        BROWSER_FORWARD = 105,
        BROWSER_REFRESH = 103,
        BROWSER_STOP = 104,
        BROWSER_SEARCH = 101,
        BROWSER_FAVORITES = 102,
        BROWSER_HOME = 50,
        VOLUME_MUTE = 32,
        VOLUME_DOWN = 46,
        VOLUME_UP = 48,
        MEDIA_NEXT_TRACK = 25,
        MEDIA_PREV_TRACK = 16,
        MEDIA_STOP = 36,
        MEDIA_PLAY_PAUSE = 34,
        LAUNCH_MAIL = 108,
        LAUNCH_MEDIA_SELECT = 109,
        LAUNCH_APP1 = 107,
        LAUNCH_APP2 = 33,
        OEM_1 = 39,
        OEM_PLUS = 13,
        OEM_COMMA = 51,
        OEM_MINUS = 12,
        OEM_PERIOD = 52,
        OEM_2 = 53,
        OEM_3 = 41,
        OEM_4 = 26,
        OEM_5 = 43,
        OEM_6 = 27,
        OEM_7 = 40,
        OEM_8 = 0,
        OEM_102 = 86,
        PROCESSKEY = 0,
        PACKET = 0,
        ATTN = 0,
        CRSEL = 0,
        EXSEL = 0,
        EREOF = 93,
        PLAY = 0,
        ZOOM = 98,
        NONAME = 0,
        PA1 = 0,
        OEM_CLEAR = 0
    }

    [StructLayout(LayoutKind.Sequential)]
    internal struct HARDWAREINPUT
    {
        internal int UMsg;
        internal short WParamL;
        internal short WParamH;
    }
}