■ 화면 캡처를 방지하는 방법을 보여준다.
▶ Program.cs
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using System; using System.Diagnostics; using System.Runtime.InteropServices; using System.Windows.Forms; namespace TestProject { /// <summary> /// 프로그램 /// </summary> static class Program { //////////////////////////////////////////////////////////////////////////////////////////////////// Delegate ////////////////////////////////////////////////////////////////////////////////////////// Private #region 저수준 키보드 프로시저 대리자 - LowLevelKeyboardProc(code, wordParameter, longParameter) /// <summary> /// 저수준 키보드 프로시저 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 IntPtr LowLevelKeyboardProc(int code, IntPtr wordParameter, IntPtr longParameter); #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Import ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region 윈도우 디스플레이 어피너티 설정하기 - SetWindowDisplayAffinity(windowHandle, affinity) /// <summary> /// 윈도우 디스플레이 어피너티 설정하기 /// </summary> /// <param name="windowHandle">윈도우 핸들</param> /// <param name="affinity">어피너티</param> /// <returns>처리 결과</returns> [DllImport("user32.dll")] private static extern uint SetWindowDisplayAffinity(IntPtr windowHandle, uint affinity); #endregion #region 윈도우 후킹 설정하기 - SetWindowsHookEx(hookID, lowLevelKeyboardProcessDelegate, moduleHandle, threadID) /// <summary> /// 윈도우 후킹 설정하기 /// </summary> /// <param name="hookID">후킹 ID</param> /// <param name="lowLevelKeyboardProc">저수준 키보드 처리 대리자</param> /// <param name="moduleHandle">모듈 핸들</param> /// <param name="threadID">쓰레드 ID</param> /// <returns>후킹 핸들</returns> [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)] private static extern IntPtr SetWindowsHookEx ( int hookID, LowLevelKeyboardProc lowLevelKeyboardProc, IntPtr moduleHandle, uint threadID ); #endregion #region 윈도우 후킹 취소하기 - UnhookWindowsHookEx(hookHandle) /// <summary> /// 윈도우 후킹 취소하기 /// </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(IntPtr 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>후킹 핸들</returns> [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)] private static extern IntPtr CallNextHookEx(IntPtr hookHandle, int code, IntPtr wordParameter, IntPtr longParameter); #endregion #region 모듈 핸들 구하기 - GetModuleHandle(moduleName) /// <summary> /// 모듈 핸들 구하기 /// </summary> /// <param name="moduleName">모듈명</param> /// <returns>모듈 핸들</returns> [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)] private static extern IntPtr GetModuleHandle(string moduleName); #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// 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 = 0x101; /// <summary> /// WDA_NONE /// </summary> private const uint WDA_NONE = 0; /// <summary> /// WDA_MONITOR /// </summary> private const uint WDA_MONITOR = 1; /// <summary> /// 저수준 키보드 프로시저 대리자 /// </summary> private static LowLevelKeyboardProc _lowLevelKeyboardProc = HookCallback; /// <summary> /// 후킹 핸들 /// </summary> private static IntPtr _hookHandle = IntPtr.Zero; /// <summary> /// 메인 폼 /// </summary> private static MainForm _mainForm; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region 프로그램 시작하기 - Main() /// <summary> /// 프로그램 시작하기 /// </summary> [STAThread] private static void Main() { Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); _hookHandle = SetHook(_lowLevelKeyboardProc); _mainForm = new MainForm(); Application.Run(_mainForm); UnhookWindowsHookEx(_hookHandle); } #endregion #region 후킹 콜백 처리하기 - HookCallback(code, wordParameter, longParameter) /// <summary> /// 후킹 콜백 처리하기 /// </summary> /// <param name="code">코드</param> /// <param name="wordParameter">WORD 매개 변수</param> /// <param name="longParameter">LONG 매개 변수</param> /// <returns>후킹 핸들</returns> private static IntPtr HookCallback(int code, IntPtr wordParameter, IntPtr longParameter) { if(code >= 0 && wordParameter == (IntPtr)WM_KEYDOWN) { int vkCode = Marshal.ReadInt32(longParameter); if(vkCode == 44) // PRINT SCREEN KEY { SetWindowDisplayAffinity(_mainForm.Handle, WDA_MONITOR); Console.WriteLine("KEYDOWN"); Console.WriteLine((Keys)vkCode); } } else if(code >= 0 && wordParameter == (IntPtr)WM_KEYUP) { int vkCode = Marshal.ReadInt32(longParameter); if(vkCode == 44) // PRINT SCREEN KEY { SetWindowDisplayAffinity(_mainForm.Handle, WDA_NONE); Console.WriteLine("KEYDOWN"); Console.WriteLine((Keys)vkCode); } } return CallNextHookEx(_hookHandle, code, wordParameter, longParameter); } #endregion #region 후킹 설정하기 - SetHook(lowLevelKeyboardProc) /// <summary> /// 후킹 설정하기 /// </summary> /// <param name="lowLevelKeyboardProc">저수준 키보드 프로시저 대리자</param> /// <returns>후킹 핸들</returns> private static IntPtr SetHook(LowLevelKeyboardProc lowLevelKeyboardProc) { using(Process process = Process.GetCurrentProcess()) { using(ProcessModule processModule = process.MainModule) { return SetWindowsHookEx ( WH_KEYBOARD_LL, lowLevelKeyboardProc, GetModuleHandle(processModule.ModuleName), 0 ); } } } #endregion } } |
※ PRINT SCREEN 키를 누를 때 화면 캡처 방지 기능이 작동한다.
