■ 저수준 키보드 후킹을 하는 방법을 보여준다.
▶ LowLevelKeyboardHook.cs
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using System; using System.Diagnostics; using System.Runtime.InteropServices; using System.Windows.Forms; namespace TestProject { /// <summary> /// 저수준 키보드 후킹 /// </summary> public class LowLevelKeyboardHook { //////////////////////////////////////////////////////////////////////////////////////////////////// Delegate ////////////////////////////////////////////////////////////////////////////////////////// Private #region 저수준 키보드 대리자 - LowLevelKeyboardDelegate(code, wordParameter, longParameter) /// <summary> /// 저수준 키보드 대리자 /// </summary> /// <param name="code">코드</param> /// <param name="wordParameter">WORD 매개 변수</param> /// <param name="longParameter">LONG 매개 변수</param> /// <returns></returns> private delegate IntPtr LowLevelKeyboardDelegate(int code, IntPtr wordParameter, IntPtr longParameter); #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Import ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region 모듈 핸들 구하기 - GetModuleHandle(moduleName) /// <summary> /// 모듈 핸들 구하기 /// </summary> /// <param name="moduleName">모듈명</param> /// <returns>모듈 핸들</returns> [DllImport("kernel32", CharSet = CharSet.Auto, SetLastError = true)] private static extern IntPtr GetModuleHandle(string moduleName); #endregion #region 윈도우즈 후킹 설정하기 (확장) - SetWindowsHookEx(hookType, callback, moduleHandle, threadID) /// <summary> /// 윈도우즈 후킹 설정하기 (확장) /// </summary> /// <param name="hookType">후킹 타입</param> /// <param name="callback">콜백 함수</param> /// <param name="moduleHandle">모듈 핸들</param> /// <param name="threadID">쓰레드 ID</param> /// <returns>후킹 ID</returns> [DllImport("user32", CharSet = CharSet.Auto, SetLastError = true)] private static extern IntPtr SetWindowsHookEx(int hookType, LowLevelKeyboardDelegate callback, IntPtr moduleHandle, uint threadID); #endregion #region 다음 후킹 호출하기 (확장) - CallNextHookEx(hookID, code, wordParameter, longParameter) /// <summary> /// 다음 후킹 호출하기 (확장) /// </summary> /// <param name="hookID">후킹 ID</param> /// <param name="code">코드</param> /// <param name="wordParameter">WORD 매개 변수</param> /// <param name="longParameter">LONG 매개 변수</param> /// <returns>후킹 ID</returns> [DllImport("user32", CharSet = CharSet.Auto, SetLastError = true)] private static extern IntPtr CallNextHookEx(IntPtr hookID, int code, IntPtr wordParameter, IntPtr longParameter); #endregion #region 윈도우즈 후킹 취소하기 (확장) - UnhookWindowsHookEx(hookID) /// <summary> /// 윈도우즈 후킹 취소하기 (확장) /// </summary> /// <param name="hookID">후킹 ID</param> /// <returns>처리 결과</returns> [DllImport("user32", CharSet = CharSet.Auto, SetLastError = true)] [return: MarshalAs(UnmanagedType.Bool)] private static extern bool UnhookWindowsHookEx(IntPtr hookID); #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Event ////////////////////////////////////////////////////////////////////////////////////////// Public #region 키 PRESSED 이벤트 - KeyPressed /// <summary> /// 키 PRESSED 이벤트 /// </summary> public event EventHandler<Keys> KeyPressed; #endregion #region 키 UNPRESSED 이벤트 - KeyUnpressed /// <summary> /// 키 UNPRESSED 이벤트 /// </summary> public event EventHandler<Keys> KeyUnpressed; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// WH_KEYBOARD_LL /// </summary> private const int WH_KEYBOARD_LL = 13; /// <summary> /// WM_KEYDOWN /// </summary> private const int WM_KEYDOWN = 0x0100; /// <summary> /// WM_SYSKEYDOWN /// </summary> private const int WM_SYSKEYDOWN = 0x0104; /// <summary> /// WM_KEYUP /// </summary> private const int WM_KEYUP = 0x101; /// <summary> /// WM_SYSKEYUP /// </summary> private const int WM_SYSKEYUP = 0x105; /// <summary> /// 저수준 키보드 대리자 /// </summary> private LowLevelKeyboardDelegate lowLevelKeyboardDelegate; /// <summary> /// 후킹 ID /// </summary> private IntPtr hookID = IntPtr.Zero; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - LowLevelKeyboardHook() /// <summary> /// 생성자 /// </summary> public LowLevelKeyboardHook() { this.lowLevelKeyboardDelegate = ProcessLowLevelKeyboard; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Public #region 키보드 후킹하기 - HookKeyboard() /// <summary> /// 키보드 후킹하기 /// </summary> public void HookKeyboard() { this.hookID = SetHook(this.lowLevelKeyboardDelegate); } #endregion #region 키보드 후킹 취소하기 - UnHookKeyboard() /// <summary> /// 키보드 후킹 취소하기 /// </summary> public void UnHookKeyboard() { UnhookWindowsHookEx(this.hookID); } #endregion ////////////////////////////////////////////////////////////////////////////////////////// Private #region 후킹 설정하기 - SetHook(lowLevelKeyboardDelegate) /// <summary> /// 후킹 설정하기 /// </summary> /// <param name="lowLevelKeyboardDelegate">저수준 키보드 대리자</param> /// <returns>후킹 ID</returns> private IntPtr SetHook(LowLevelKeyboardDelegate lowLevelKeyboardDelegate) { using(Process process = Process.GetCurrentProcess()) { using(ProcessModule processModule = process.MainModule) { return SetWindowsHookEx ( WH_KEYBOARD_LL, lowLevelKeyboardDelegate, GetModuleHandle(processModule.ModuleName), 0 ); } } } #endregion #region 저수준 키보드 처리하기 - ProcessLowLevelKeyboard(code, wordParameter, longParameter) /// <summary> /// 저수준 키보드 처리하기 /// </summary> /// <param name="code">코드</param> /// <param name="wordParameter">WORD 매개 변수</param> /// <param name="longParameter">LONG 매개 변수</param> /// <returns>처리 결과</returns> private IntPtr ProcessLowLevelKeyboard(int code, IntPtr wordParameter, IntPtr longParameter) { if(code >= 0 && wordParameter == (IntPtr)WM_KEYDOWN || wordParameter == (IntPtr)WM_SYSKEYDOWN) { int vkCode = Marshal.ReadInt32(longParameter); KeyPressed?.Invoke(this, ((Keys)vkCode)); } else if(code >= 0 && wordParameter == (IntPtr)WM_KEYUP || wordParameter == (IntPtr)WM_SYSKEYUP) { int vkCode = Marshal.ReadInt32(longParameter); KeyUnpressed?.Invoke(this, ((Keys)vkCode)); } return CallNextHookEx(hookID, code, wordParameter, longParameter); } #endregion } } |
▶ MainForm.cs
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using System.Windows.Forms; namespace TestProject { /// <summary> /// 메인 폼 /// </summary> public partial class MainForm : Form { //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainForm() /// <summary> /// 생성자 /// </summary> public MainForm() { InitializeComponent(); } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Public #region 메시지 표시하기 - DisplayMessage(keys) /// <summary> /// 메시지 표시하기 /// </summary> /// <param name="keys">키</param> public void DisplayMessage(Keys keys) { this.messageLabel.Text = keys.ToString(); } #endregion } } |
▶ Program.cs
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using System; using System.Windows.Forms; namespace TestProject { /// <summary> /// 프로그램 /// </summary> class Program { //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region 프로그램 시작하기 - Main() /// <summary> /// 프로그램 시작하기 /// </summary> [STAThread] private static void Main() { Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); MainForm mainForm = new MainForm(); LowLevelKeyboardHook keyboardHook = new LowLevelKeyboardHook(); keyboardHook.KeyPressed += (sender, e) => mainForm.DisplayMessage(e); keyboardHook.HookKeyboard(); Application.Run(mainForm); keyboardHook.UnHookKeyboard(); } #endregion } } |
