■ 잠금 화면을 설정하는 방법을 보여준다. (기능 개선)
▶ BlockForm.cs
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using System; using System.Windows.Forms; namespace TestProject { /// <summary> /// 블럭 폼 /// </summary> public partial class BlockForm : Form { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 최초 활성화 여부 /// </summary> private bool firstActivated = true; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - BlockForm() /// <summary> /// 생성자 /// </summary> public BlockForm() { InitializeComponent(); SetStyle(ControlStyles.DoubleBuffer , true); SetStyle(ControlStyles.AllPaintingInWmPaint, true); SetStyle(ControlStyles.UserPaint , true); Activated += Form_Activated; this.returnButton.Click += returnButton_Click; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 폼 활성화시 처리하기 - Form_Activated(sender, e) /// <summary> /// 폼 활성화시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void Form_Activated(object sender, EventArgs e) { if(this.firstActivated) { this.firstActivated = false; return; } if(WindowsHelper.IsLocked) { if(WindowsHelper.ScreenCount != System.Windows.Forms.Screen.AllScreens.Length) { WindowsHelper.CloseBlockWindows(); WindowsHelper.ShowBlockWindows(); } ////////// 개발시 사용 코드 START WindowsHelper.ShowCursor(); ////////// 개발시 사용 코드 END ////////// 일반 사용 코드 START //WindowsHelper.DisableInput(); // //WindowsHelper.HideCursor(); ////////// 일반 사용 코드 END } } #endregion #region 돌아가기 버튼 클릭시 처리하기 - returnButton_Click(sender, e) /// <summary> /// 돌아가기 버튼 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void returnButton_Click(object sender, EventArgs e) { WindowsHelper.UnlockScreen(); } #endregion } } |
▶ WindowsHelper.cs
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using Microsoft.Win32; using System; using System.Collections.Generic; using System.Diagnostics; using System.Linq; using System.Runtime.InteropServices; using System.Windows.Forms; namespace TestProject { /// <summary> /// 윈도우즈 헬퍼 /// </summary> public class WindowsHelper { //////////////////////////////////////////////////////////////////////////////////////////////////// Structure ////////////////////////////////////////////////////////////////////////////////////////// Private #region 키보드 저수준 후킹 구조체 - KBDLLHOOKSTRUCT /// <summary> /// 키보드 저수준 후킹 구조체 /// </summary> private struct KBDLLHOOKSTRUCT { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Public #region Field /// <summary> /// 가상 키 코드 /// </summary> public int VirtualKeyCode; /// <summary> /// 스캔 코드 /// </summary> public int ScanCode; /// <summary> /// 플래그 /// </summary> public int Flags; /// <summary> /// 시간 /// </summary> public int Time; /// <summary> /// 부가 정보 /// </summary> public int ExtraInfo; #endregion } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Delegate ////////////////////////////////////////////////////////////////////////////////////////// Private #region 키보드 후킹 처리 대리자 - ProcessKeyboardHookDelegate(code, wordParameter, longParameter) /// <summary> /// 키보드 후킹 처리 대리자 /// </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 delegate int ProcessKeyboardHookDelegate(int code, int wordParameter, ref KBDLLHOOKSTRUCT longParameter); #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Import ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region 윈도우 후킹 설정하기 - SetWindowsHookEx(hookID, processKeyboardHookDelegate, moduleHandle, threadID) /// <summary> /// 윈도우 후킹 설정하기 /// </summary> /// <param name="hookID">후킹 ID</param> /// <param name="processKeyboardHookDelegate">키보드 후킹 처리 대리자</param> /// <param name="moduleHandle">모듈 핸들</param> /// <param name="threadID">스레드 ID</param> /// <returns>처리 결과</returns> [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)] private static extern int SetWindowsHookEx ( int hookID, ProcessKeyboardHookDelegate processKeyboardHookDelegate, IntPtr moduleHandle, uint threadID ); #endregion #region 윈도우 후킹 해제하기 - UnhookWindowsHookEx(hookHandle) /// <summary> /// 윈도우 후킹 해제하기 /// </summary> /// <param name="hookHandle">후킹 핸들</param> /// <returns>처리 결과</returns> [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)] [return: MarshalAs(UnmanagedType.Bool)] private static extern bool UnhookWindowsHookEx(int hookHandle); #endregion #region 다음 후킹 호출하기 - CallNextHookEx(hookHandle, code, wordParameter, longParameter) /// <summary> /// 다음 후킹 호출하기 /// </summary> /// <param name="hookHandle">후킹 핸들</param> /// <param name="code">코드</param> /// <param name="wordParameter">WORD 매개 변수</param> /// <param name="longParameter">LONG 매개 변수</param> /// <returns>처리 결과</returns> [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)] private static extern int CallNextHookEx(int hookHandle, int code, int wordParameter, ref KBDLLHOOKSTRUCT longParameter); #endregion #region 모듈 핸들 구하기 - GetModuleHandle(modulName) /// <summary> /// 모듈 핸들 구하기 /// </summary> /// <param name="modulName">모듈명</param> /// <returns>모듈 핸들</returns> [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)] private static extern IntPtr GetModuleHandle(string modulName); #endregion #region 입력 방지하기 - BlockInput(blocking) /// <summary> /// 입력 방지하기 /// </summary> /// <param name="blocking">입력 방지 여부</param> [return: MarshalAs(UnmanagedType.Bool)] [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)] private static extern void BlockInput([In, MarshalAs(UnmanagedType.Bool)]bool blocking); #endregion #region 커서 표시하기 - ShowCursor(show) /// <summary> /// 커서 표시하기 /// </summary> /// <param name="show">표시 여부</param> /// <returns>디스플레이 카운트</returns> [DllImport("user32.dll")] private static extern int ShowCursor(bool show); #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 키보드 후킹 처리 대리자 /// </summary> private static ProcessKeyboardHookDelegate _processKeyboardHookDelegate = ProcessKeyboardHook; /// <summary> /// 후킹 ID /// </summary> private static int _hookID = 0; /// <summary> /// 태스크 관리자 이용 가능 여부 /// </summary> private static bool _taskManagerEnabled = true; /// <summary> /// 특수 키보드 입력 이용 가능 여부 /// </summary> private static bool _specialKeyboardInputEnabled = true; /// <summary> /// 잠금 여부 /// </summary> private static bool _isLocked = false; /// <summary> /// 화면 리스트 /// </summary> private static List<Screen> _screenList = null; /// <summary> /// 벽 폼 리스트 /// </summary> private static List<BlockForm> _formList = null; /// <summary> /// 화면 카운트 /// </summary> private static int _screenCount = 0; #endregion ////////////////////////////////////////////////////////////////////////////////////////// Instance //////////////////////////////////////////////////////////////////////////////// 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_KEYUP /// </summary> private const int WM_KEYUP = 0x0101; /// <summary> /// WM_SYSKEYDOWN /// </summary> private const int WM_SYSKEYDOWN = 0x0104; /// <summary> /// WM_SYSKEYUP /// </summary> private const int WM_SYSKEYUP = 0x0105; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 화면 카운트 - ScreenCount /// <summary> /// 화면 카운트 /// </summary> public static int ScreenCount { get { return _screenCount; } } #endregion #region 잠금 여부 - IsLocked /// <summary> /// 잠금 여부 /// </summary> public static bool IsLocked { get { return _isLocked; } } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Static #region 생성자 - WindowsHelper() /// <summary> /// 생성자 /// </summary> static WindowsHelper() { SystemEvents.DisplaySettingsChanged += systemEvents_DisplaySettingsChanged; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 태스크 관리자 비활성화 하기 - DisableTaskManager() /// <summary> /// 태스크 관리자 비활성화 하기 /// </summary> /// <remarks>Ctrl + Alt + Delete 키 입력을 거부한다.</remarks> public static void DisableTaskManager() { if(!_taskManagerEnabled) { return; } RegistryKey registryKey; int keyValue = 1; string subKey = "Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\System"; registryKey = Registry.CurrentUser.CreateSubKey(subKey); registryKey.SetValue("DisableTaskMgr", keyValue); registryKey.Close(); _taskManagerEnabled = false; } #endregion #region 태스크 관리자 활성화 하기 - EnableTaskManager() /// <summary> /// 태스크 관리자 활성화 하기 /// </summary> /// <remarks>Ctrl + Alt + Delete 키 입력을 허용한다.</remarks> public static void EnableTaskManager() { if(_taskManagerEnabled) { return; } RegistryKey currentUserRegistryKey = Registry.CurrentUser; string subKey = "Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\System"; RegistryKey registryKey = currentUserRegistryKey.OpenSubKey(subKey); if(registryKey != null) { currentUserRegistryKey.DeleteSubKeyTree(subKey); } _taskManagerEnabled = true; } #endregion #region 특수 키보드 입력 비활성 화기 - DisableSpecialKeyboardInput() /// <summary> /// 특수 키보드 입력 비활성 화기 /// </summary> public static void DisableSpecialKeyboardInput() { if(!_specialKeyboardInputEnabled) { return; } _hookID = SetHook(_processKeyboardHookDelegate); _specialKeyboardInputEnabled = false; } #endregion #region 특수 키보드 입력 활성화 하기 - EnableSpecialKeyboardInput() /// <summary> /// 특수 키보드 입력 활성화 하기 /// </summary> public static void EnableSpecialKeyboardInput() { if(_specialKeyboardInputEnabled) { return; } UnhookWindowsHookEx(_hookID); _specialKeyboardInputEnabled = true; } #endregion #region 입력 비활성화 하기 - DisableInput() /// <summary> /// 입력 비활성화 하기 /// </summary> public static void DisableInput() { BlockInput(true); } #endregion #region 입력 활성화 하기 - EnableInput() /// <summary> /// 입력 활성화 하기 /// </summary> public static void EnableInput() { BlockInput(false); } #endregion #region 커서 표시하기 - ShowCursor() /// <summary> /// 커서 표시하기 /// </summary> public static void ShowCursor() { int displayCount = ShowCursor(true); while(displayCount < 0) { displayCount = ShowCursor(true); } } #endregion #region 커서 숨기기 - HideCursor() /// <summary> /// 커서 숨기기 /// </summary> public static void HideCursor() { int displayCount = ShowCursor(false); while(displayCount >= 0) { displayCount = ShowCursor(false); } } #endregion #region 블럭 윈도우 보여주기 - ShowBlockWindows() /// <summary> /// 블럭 윈도우 보여주기 /// </summary> public static void ShowBlockWindows() { _screenList = System.Windows.Forms.Screen.AllScreens.ToList(); _screenCount = _screenList.Count; if(_formList == null) { _formList = new List<BlockForm>(); } for(int i = 0; i < _screenList.Count; i++) { BlockForm form = new BlockForm(); form.FormBorderStyle = FormBorderStyle.None; form.WindowState = FormWindowState.Maximized; form.StartPosition = FormStartPosition.Manual; form.Left = _screenList[i].WorkingArea.Left; form.Top = _screenList[i].WorkingArea.Top; form.Width = _screenList[i].WorkingArea.Width; form.Height = _screenList[i].WorkingArea.Height; _formList.Add(form); form.Show(); form.BringToFront(); } } #endregion #region 블럭 윈도우 닫기 - CloseBlockWindows() /// <summary> /// 블럭 윈도우 닫기 /// </summary> public static void CloseBlockWindows() { if(_formList.Count > 0) { for(int i = _formList.Count - 1; i > -1; i--) { BlockForm form = _formList[i]; _formList.Remove(form); form.Close(); } _formList.Clear(); } } #endregion #region 화면 잠그기 - LockScreen() /// <summary> /// 화면 잠그기 /// </summary> public static void LockScreen() { if(_isLocked) { return; } HideCursor(); DisableTaskManager(); DisableSpecialKeyboardInput(); DisableInput(); ShowBlockWindows(); _isLocked = true; } #endregion #region 화면 잠금 취소하기 - UnlockScreen() /// <summary> /// 화면 잠금 취소하기 /// </summary> public static void UnlockScreen() { if(!_isLocked) { return; } CloseBlockWindows(); EnableInput(); EnableSpecialKeyboardInput(); EnableTaskManager(); ShowCursor(); _isLocked = false; } #endregion //////////////////////////////////////////////////////////////////////////////// Private ////////////////////////////////////////////////////////////////////// Event #region 시스템 이벤트 디스플레이 설정 변경시 처리하기 - systemEvents_DisplaySettingsChanged(sender, e) /// <summary> /// 시스템 이벤트 디스플레이 설정 변경시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private static void systemEvents_DisplaySettingsChanged(object sender, EventArgs e) { if(_isLocked) { if(_screenCount != System.Windows.Forms.Screen.AllScreens.Length) { CloseBlockWindows(); ShowBlockWindows(); } HideCursor(); } } #endregion ////////////////////////////////////////////////////////////////////// Function #region 후킹 설정하기 - SetHook(processKeyboardHookDelegate) /// <summary> /// 후킹 설정하기 /// </summary> /// <param name="processKeyboardHookDelegate">키보드 후킹 처리 대리자</param> /// <returns>처리 결과</returns> private static int SetHook(ProcessKeyboardHookDelegate processKeyboardHookDelegate) { using(Process process = Process.GetCurrentProcess()) { using(ProcessModule processModule = process.MainModule) { return SetWindowsHookEx(WH_KEYBOARD_LL, processKeyboardHookDelegate, GetModuleHandle(processModule.ModuleName), 0); } } } #endregion #region 키보드 후킹 처리하기 - ProcessKeyboardHook(code, wordParameter, longParameter) /// <summary> /// 키보드 후킹 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 static int ProcessKeyboardHook(int code, int wordParameter, ref KBDLLHOOKSTRUCT longParameter) { bool result = false; switch(wordParameter) { case WM_KEYDOWN : case WM_KEYUP : case WM_SYSKEYDOWN : case WM_SYSKEYUP : result = ((longParameter.VirtualKeyCode == 0x09) && (longParameter.Flags == 0x20)) || // Alt + Tab ((longParameter.VirtualKeyCode == 0x1B) && (longParameter.Flags == 0x20)) || // Alt + Esc ((longParameter.VirtualKeyCode == 0x1B) && (longParameter.Flags == 0x00)) || // Ctrl + Esc ((longParameter.VirtualKeyCode == 0x5B) && (longParameter.Flags == 0x01)) || // Left Windows Key ((longParameter.VirtualKeyCode == 0x5C) && (longParameter.Flags == 0x01)) || // Right Windows Key ((longParameter.VirtualKeyCode == 0x73) && (longParameter.Flags == 0x20)); // Alt + F4 break; } if(result == true) { return 1; } else { return CallNextHookEx(0, code, wordParameter, ref longParameter); } } #endregion } } |
▶ MainForm.cs
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using System; 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(); this.lockButton.Click += lockButton_Click; this.unlockButton.Click += unlockButton_Click; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private #region 화면 잠금 버튼 클릭시 처리하기 - lockButton_Click(sender, e) /// <summary> /// 화면 잠금 버튼 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void lockButton_Click(object sender, EventArgs e) { WindowsHelper.LockScreen(); } #endregion #region 잠금 취소 버튼 클릭시 처리하기 - unlockButton_Click(sender, e) /// <summary> /// 잠금 취소 버튼 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void unlockButton_Click(object sender, EventArgs e) { WindowsHelper.UnlockScreen(); } #endregion } } |
