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C# - SendInput Win32 API를 이용한 가상 키보드/마우스

그동안 가상 키보드/마우스 관련해 이미 솔루션을 충분히 다뤄봤는데요,

Raspberry Pi Zero(OTG)를 다른 컴퓨터에 연결해 가상 마우스 + 키보드로 쓰는 방법 (두 번째 이야기)
; https://www.sysnet.pe.kr/2/0/11363

USB/IP PROJECT를 이용해 C#으로 USB Keyboard + Mouse 가상 장치 만들기
; https://www.sysnet.pe.kr/2/0/12229

그러고 보니, SendInput을 이용한 방법은 한 번도 소개한 적이 없었습니다.

SendInput
; https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-sendinput

하지만, 이미 다른 글에서 충분히 잘 다루고 있기 때문에,

Sending Keystrokes to Other Apps with Windows API and C# 
; https://dzone.com/articles/sending-keys-other-apps

inputsimulator/WindowsInput/
; https://github.com/michaelnoonan/inputsimulator/tree/master/WindowsInput

자세한 설명은 생략하고 다음의 소스 코드만 실어 놓겠습니다. ^^

using System;
using System.Runtime.InteropServices;
using System.Threading;

namespace ConsoleApp1
{
    // Sending Keystrokes to Other Apps with Windows API and C# 
    // ; https://dzone.com/articles/sending-keys-other-apps

    // inputsimulator/WindowsInput/
    // ; https://github.com/michaelnoonan/inputsimulator/tree/master/WindowsInput
    [StructLayout(LayoutKind.Sequential)]
    internal struct MOUSEINPUT
    {
        public int X;
        public int Y;
        public uint MouseData;
        public uint Flags;
        public uint Time;
        public IntPtr ExtraInfo;
    }

    [StructLayout(LayoutKind.Sequential)]
    internal struct KEYBDINPUT
    {
        public ushort Vk;
        public ushort Scan;
        public uint Flags;
        public uint Time;
        public IntPtr ExtraInfo;
    }

    [StructLayout(LayoutKind.Sequential)]
    internal struct HARDWAREINPUT
    {
        public uint Msg;
        public ushort ParamL;
        public ushort ParamH;
    }

    [StructLayout(LayoutKind.Explicit)]
    internal struct MOUSEKEYBDHARDWAREINPUT
    {
        [FieldOffset(0)]
        public HARDWAREINPUT Hardware;
        [FieldOffset(0)]
        public KEYBDINPUT Keyboard;
        [FieldOffset(0)]
        public MOUSEINPUT Mouse;
    }

    [StructLayout(LayoutKind.Sequential)]
    internal struct INPUT
    {
        public uint Type;
        public MOUSEKEYBDHARDWAREINPUT Data;
    }

    class Program
    {
        [DllImport("user32.dll", SetLastError = true)]
        private static extern uint SendInput(uint numberOfInputs, INPUT[] inputs, int sizeOfInputStructure);

        public static void SendKeyPress(KeyCode keyCode)
        {
            INPUT input = new INPUT
            {
                Type = 1
            };
            input.Data.Keyboard = new KEYBDINPUT()
            {
                Vk = (ushort)keyCode,
                Scan = 0,
                Flags = 0,
                Time = 0,
                ExtraInfo = IntPtr.Zero,
            };

            INPUT input2 = new INPUT
            {
                Type = 1
            };
            input2.Data.Keyboard = new KEYBDINPUT()
            {
                Vk = (ushort)keyCode,
                Scan = 0,
                Flags = 2,
                Time = 0,
                ExtraInfo = IntPtr.Zero
            };
            INPUT[] inputs = new INPUT[] { input, input2 };
            if (SendInput(2, inputs, Marshal.SizeOf(typeof(INPUT))) == 0)
                throw new Exception();
        }

        /// <summary>
        /// Send a key down and hold it down until sendkeyup method is called
        /// </summary>
        /// <param name="keyCode"></param>
        public static void SendKeyDown(KeyCode keyCode)
        {
            INPUT input = new INPUT
            {
                Type = 1
            };
            input.Data.Keyboard = new KEYBDINPUT();
            input.Data.Keyboard.Vk = (ushort)keyCode;
            input.Data.Keyboard.Scan = 0;
            input.Data.Keyboard.Flags = 0;
            input.Data.Keyboard.Time = 0;
            input.Data.Keyboard.ExtraInfo = IntPtr.Zero;
            INPUT[] inputs = new INPUT[] { input };
            if (SendInput(1, inputs, Marshal.SizeOf(typeof(INPUT))) == 0)
            {
                throw new Exception();
            }
        }

        /// <summary>
        /// Release a key that is being hold down
        /// </summary>
        /// <param name="keyCode"></param>
        public static void SendKeyUp(KeyCode keyCode)
        {
            INPUT input = new INPUT
            {
                Type = 1
            };
            input.Data.Keyboard = new KEYBDINPUT();
            input.Data.Keyboard.Vk = (ushort)keyCode;
            input.Data.Keyboard.Scan = 0;
            input.Data.Keyboard.Flags = 2;
            input.Data.Keyboard.Time = 0;
            input.Data.Keyboard.ExtraInfo = IntPtr.Zero;
            INPUT[] inputs = new INPUT[] { input };
            if (SendInput(1, inputs, Marshal.SizeOf(typeof(INPUT))) == 0)
                throw new Exception();

        }

        public enum KeyCode : ushort
        {
            #region Media

            /// <summary>
            /// Next track if a song is playing
            /// </summary>
            MEDIA_NEXT_TRACK = 0xb0,

            /// <summary>
            /// Play pause
            /// </summary>
            MEDIA_PLAY_PAUSE = 0xb3,

            /// <summary>
            /// Previous track
            /// </summary>
            MEDIA_PREV_TRACK = 0xb1,

            /// <summary>
            /// Stop
            /// </summary>
            MEDIA_STOP = 0xb2,

            #endregion

            #region math

            /// <summary>Key "+"</summary>
            ADD = 0x6b,
            /// <summary>
            /// "*" key
            /// </summary>
            MULTIPLY = 0x6a,

            /// <summary>
            /// "/" key
            /// </summary>
            DIVIDE = 0x6f,

            /// <summary>
            /// Subtract key "-"
            /// </summary>
            SUBTRACT = 0x6d,

            #endregion

            #region Browser
            /// <summary>
            /// Go Back
            /// </summary>
            BROWSER_BACK = 0xa6,
            /// <summary>
            /// Favorites
            /// </summary>
            BROWSER_FAVORITES = 0xab,
            /// <summary>
            /// Forward
            /// </summary>
            BROWSER_FORWARD = 0xa7,
            /// <summary>
            /// Home
            /// </summary>
            BROWSER_HOME = 0xac,
            /// <summary>
            /// Refresh
            /// </summary>
            BROWSER_REFRESH = 0xa8,
            /// <summary>
            /// browser search
            /// </summary>
            BROWSER_SEARCH = 170,
            /// <summary>
            /// Stop
            /// </summary>
            BROWSER_STOP = 0xa9,
            #endregion

            #region Numpad numbers
            /// <summary>
            /// 
            /// </summary>
            NUMPAD0 = 0x60,
            /// <summary>
            /// 
            /// </summary>
            NUMPAD1 = 0x61,
            /// <summary>
            /// 
            /// </summary>
            NUMPAD2 = 0x62,
            /// <summary>
            /// 
            /// </summary>
            NUMPAD3 = 0x63,
            /// <summary>
            /// 
            /// </summary>
            NUMPAD4 = 100,
            /// <summary>
            /// 
            /// </summary>
            NUMPAD5 = 0x65,
            /// <summary>
            /// 
            /// </summary>
            NUMPAD6 = 0x66,
            /// <summary>
            /// 
            /// </summary>
            NUMPAD7 = 0x67,
            /// <summary>
            /// 
            /// </summary>
            NUMPAD8 = 0x68,
            /// <summary>
            /// 
            /// </summary>
            NUMPAD9 = 0x69,

            #endregion

            #region Fkeys
            /// <summary>
            /// F1
            /// </summary>
            F1 = 0x70,
            /// <summary>
            /// F10
            /// </summary>
            F10 = 0x79,
            /// <summary>
            /// 
            /// </summary>
            F11 = 0x7a,
            /// <summary>
            /// 
            /// </summary>
            F12 = 0x7b,
            /// <summary>
            /// 
            /// </summary>
            F13 = 0x7c,
            /// <summary>
            /// 
            /// </summary>
            F14 = 0x7d,
            /// <summary>
            /// 
            /// </summary>
            F15 = 0x7e,
            /// <summary>
            /// 
            /// </summary>
            F16 = 0x7f,
            /// <summary>
            /// 
            /// </summary>
            F17 = 0x80,
            /// <summary>
            /// 
            /// </summary>
            F18 = 0x81,
            /// <summary>
            /// 
            /// </summary>
            F19 = 130,
            /// <summary>
            /// 
            /// </summary>
            F2 = 0x71,
            /// <summary>
            /// 
            /// </summary>
            F20 = 0x83,
            /// <summary>
            /// 
            /// </summary>
            F21 = 0x84,
            /// <summary>
            /// 
            /// </summary>
            F22 = 0x85,
            /// <summary>
            /// 
            /// </summary>
            F23 = 0x86,
            /// <summary>
            /// 
            /// </summary>
            F24 = 0x87,
            /// <summary>
            /// 
            /// </summary>
            F3 = 0x72,
            /// <summary>
            /// 
            /// </summary>
            F4 = 0x73,
            /// <summary>
            /// 
            /// </summary>
            F5 = 0x74,
            /// <summary>
            /// 
            /// </summary>
            F6 = 0x75,
            /// <summary>
            /// 
            /// </summary>
            F7 = 0x76,
            /// <summary>
            /// 
            /// </summary>
            F8 = 0x77,
            /// <summary>
            /// 
            /// </summary>
            F9 = 120,

            #endregion

            #region Other
            /// <summary>
            /// 
            /// </summary>
            OEM_1 = 0xba,
            /// <summary>
            /// 
            /// </summary>
            OEM_102 = 0xe2,
            /// <summary>
            /// 
            /// </summary>
            OEM_2 = 0xbf,
            /// <summary>
            /// 
            /// </summary>
            OEM_3 = 0xc0,
            /// <summary>
            /// 
            /// </summary>
            OEM_4 = 0xdb,
            /// <summary>
            /// 
            /// </summary>
            OEM_5 = 220,
            /// <summary>
            /// 
            /// </summary>
            OEM_6 = 0xdd,
            /// <summary>
            /// 
            /// </summary>
            OEM_7 = 0xde,
            /// <summary>
            /// 
            /// </summary>
            OEM_8 = 0xdf,
            /// <summary>
            /// 
            /// </summary>
            OEM_CLEAR = 0xfe,
            /// <summary>
            /// 
            /// </summary>
            OEM_COMMA = 0xbc,
            /// <summary>
            /// 
            /// </summary>
            OEM_MINUS = 0xbd,
            /// <summary>
            /// 
            /// </summary>
            OEM_PERIOD = 190,
            /// <summary>
            /// 
            /// </summary>
            OEM_PLUS = 0xbb,

            #endregion

            #region KEYS

            /// <summary>
            /// 
            /// </summary>
            KEY_0 = 0x30,
            /// <summary>
            /// 
            /// </summary>
            KEY_1 = 0x31,
            /// <summary>
            /// 
            /// </summary>
            KEY_2 = 50,
            /// <summary>
            /// 
            /// </summary>
            KEY_3 = 0x33,
            /// <summary>
            /// 
            /// </summary>
            KEY_4 = 0x34,
            /// <summary>
            /// 
            /// </summary>
            KEY_5 = 0x35,
            /// <summary>
            /// 
            /// </summary>
            KEY_6 = 0x36,
            /// <summary>
            /// 
            /// </summary>
            KEY_7 = 0x37,
            /// <summary>
            /// 
            /// </summary>
            KEY_8 = 0x38,
            /// <summary>
            /// 
            /// </summary>
            KEY_9 = 0x39,
            /// <summary>
            /// 
            /// </summary>
            KEY_A = 0x41,
            /// <summary>
            /// 
            /// </summary>
            KEY_B = 0x42,
            /// <summary>
            /// 
            /// </summary>
            KEY_C = 0x43,
            /// <summary>
            /// 
            /// </summary>
            KEY_D = 0x44,
            /// <summary>
            /// 
            /// </summary>
            KEY_E = 0x45,
            /// <summary>
            /// 
            /// </summary>
            KEY_F = 70,
            /// <summary>
            /// 
            /// </summary>
            KEY_G = 0x47,
            /// <summary>
            /// 
            /// </summary>
            KEY_H = 0x48,
            /// <summary>
            /// 
            /// </summary>
            KEY_I = 0x49,
            /// <summary>
            /// 
            /// </summary>
            KEY_J = 0x4a,
            /// <summary>
            /// 
            /// </summary>
            KEY_K = 0x4b,
            /// <summary>
            /// 
            /// </summary>
            KEY_L = 0x4c,
            /// <summary>
            /// 
            /// </summary>
            KEY_M = 0x4d,
            /// <summary>
            /// 
            /// </summary>
            KEY_N = 0x4e,
            /// <summary>
            /// 
            /// </summary>
            KEY_O = 0x4f,
            /// <summary>
            /// 
            /// </summary>
            KEY_P = 80,
            /// <summary>
            /// 
            /// </summary>
            KEY_Q = 0x51,
            /// <summary>
            /// 
            /// </summary>
            KEY_R = 0x52,
            /// <summary>
            /// 
            /// </summary>
            KEY_S = 0x53,
            /// <summary>
            /// 
            /// </summary>
            KEY_T = 0x54,
            /// <summary>
            /// 
            /// </summary>
            KEY_U = 0x55,
            /// <summary>
            /// 
            /// </summary>
            KEY_V = 0x56,
            /// <summary>
            /// 
            /// </summary>
            KEY_W = 0x57,
            /// <summary>
            /// 
            /// </summary>
            KEY_X = 0x58,
            /// <summary>
            /// 
            /// </summary>
            KEY_Y = 0x59,
            /// <summary>
            /// 
            /// </summary>
            KEY_Z = 90,

            #endregion

            #region volume
            /// <summary>
            /// Decrese volume
            /// </summary>
            VOLUME_DOWN = 0xae,

            /// <summary>
            /// Mute volume
            /// </summary>
            VOLUME_MUTE = 0xad,

            /// <summary>
            /// Increase volue
            /// </summary>
            VOLUME_UP = 0xaf,

            #endregion


            /// <summary>
            /// Take snapshot of the screen and place it on the clipboard
            /// </summary>
            SNAPSHOT = 0x2c,

            /// <summary>Send right click from keyboard "key that is 2 keys to the right of space bar"</summary>
            RightClick = 0x5d,

            /// <summary>
            /// Go Back or delete
            /// </summary>
            BACKSPACE = 8,

            /// <summary>
            /// Control + Break "When debuging if you step into an infinite loop this will stop debug"
            /// </summary>
            CANCEL = 3,
            /// <summary>
            /// Caps lock key to send cappital letters
            /// </summary>
            CAPS_LOCK = 20,
            /// <summary>
            /// Ctlr key
            /// </summary>
            CONTROL = 0x11,

            /// <summary>
            /// Alt key
            /// </summary>
            ALT = 18,

            /// <summary>
            /// "." key
            /// </summary>
            DECIMAL = 110,

            /// <summary>
            /// Delete Key
            /// </summary>
            DELETE = 0x2e,


            /// <summary>
            /// Arrow down key
            /// </summary>
            DOWN = 40,

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

            /// <summary>
            /// Escape key
            /// </summary>
            ESC = 0x1b,

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

            /// <summary>
            /// Insert key
            /// </summary>
            INSERT = 0x2d,

            /// <summary>
            /// Open my computer
            /// </summary>
            LAUNCH_APP1 = 0xb6,
            /// <summary>
            /// Open calculator
            /// </summary>
            LAUNCH_APP2 = 0xb7,

            /// <summary>
            /// Open default email in my case outlook
            /// </summary>
            LAUNCH_MAIL = 180,

            /// <summary>
            /// Opend default media player (itunes, winmediaplayer, etc)
            /// </summary>
            LAUNCH_MEDIA_SELECT = 0xb5,

            /// <summary>
            /// Left control
            /// </summary>
            LCONTROL = 0xa2,

            /// <summary>
            /// Left arrow
            /// </summary>
            LEFT = 0x25,

            /// <summary>
            /// Left shift
            /// </summary>
            LSHIFT = 160,

            /// <summary>
            /// left windows key
            /// </summary>
            LWIN = 0x5b,


            /// <summary>
            /// Next "page down"
            /// </summary>
            PAGEDOWN = 0x22,

            /// <summary>
            /// Num lock to enable typing numbers
            /// </summary>
            NUMLOCK = 0x90,

            /// <summary>
            /// Page up key
            /// </summary>
            PAGE_UP = 0x21,

            /// <summary>
            /// Right control
            /// </summary>
            RCONTROL = 0xa3,

            /// <summary>
            /// Return key
            /// </summary>
            ENTER = 13,

            /// <summary>
            /// Right arrow key
            /// </summary>
            RIGHT = 0x27,

            /// <summary>
            /// Right shift
            /// </summary>
            RSHIFT = 0xa1,

            /// <summary>
            /// Right windows key
            /// </summary>
            RWIN = 0x5c,

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

            /// <summary>
            /// Space back key
            /// </summary>
            SPACE_BAR = 0x20,

            /// <summary>
            /// Tab key
            /// </summary>
            TAB = 9,

            /// <summary>
            /// Up arrow key
            /// </summary>
            UP = 0x26,

        }
    }
}

저렇게 SendInput 관련 코드를 작성했으면 이제 키보드 입력 전달을 다음과 같이 할 수 있습니다.

static void Main(string[] args)
{
    Thread.Sleep(5 * 1000);

    SendKeyPress(KeyCode.KEY_Z);
}

(첨부 파일은 이 글의 예제 코드를 포함합니다.)

사실 보안 도구와 잘 협업하고 있는 게임과 같은 특수 사례만 아니라면 SendInput API만으로도 대부분의 키보드/마우스 입력을 전달하는데 별문제가 없습니다.




[이 글에 대해서 여러분들과 의견을 공유하고 싶습니다. 틀리거나 미흡한 부분 또는 의문 사항이 있으시면 언제든 댓글 남겨주십시오.]



donaricano-btn



[최초 등록일: ]
[최종 수정일: 7/9/2021]

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이 저작물은 크리에이티브 커먼즈 코리아 저작자표시-비영리-변경금지 2.0 대한민국 라이센스에 따라 이용하실 수 있습니다.
by SeongTae Jeong, mailto:techsharer at outlook.com

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