C# 键盘钩子
1、键盘钩子:
通过代码将键盘的事件屏蔽掉,达到锁屏的效果。(参考地址:https://zhidao.baidu.com/question/135132386108196965.html)
2、代码如下:
public class Hook : IDisposable { public delegate int HookProc(int nCode, int wParam, IntPtr lParam); private static int hHook; public const int WH_KEYBOARD_LL = 13; private HookProc KeyBoardHookProcedure; [StructLayout(LayoutKind.Sequential)] public class KeyBoardHookStruct { public int vkCode; public int scanCode; public int flags; public int time; public int dwExtraInfo; } [DllImport("user32.dll")] public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId); [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)] public static extern bool UnhookWindowsHookEx(int idHook); [DllImport("user32.dll")] public static extern int CallNextHookEx(int idHook, int nCode, int wParam, IntPtr lParam); [DllImport("kernel32.dll")] public static extern IntPtr GetModuleHandle(string name); public void Start() { // 安装键盘钩子 if (hHook == 0) { KeyBoardHookProcedure = KeyBoardHookProc; hHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyBoardHookProcedure, GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), 0); //如果设置钩子失败. if (hHook == 0) { Close(); } else { var key = Registry.CurrentUser.OpenSubKey( @"Software\Microsoft\Windows\CurrentVersion\Policies\System", true); if (key == null) //如果该项不存在的话,则创建该项 key = Registry.CurrentUser.CreateSubKey( @"Software\Microsoft\Windows\CurrentVersion\Policies\System"); key.SetValue("DisableTaskMgr", 1, RegistryValueKind.DWord); key.Close(); } } } public void Close() { var retKeyboard = true; if (hHook != 0) { retKeyboard = UnhookWindowsHookEx(hHook); hHook = 0; } //如果去掉钩子失败. //if (!retKeyboard) throw new Exception("UnhookWindowsHookEx failed."); var key = Registry.CurrentUser.OpenSubKey(@"Software\Microsoft\Windows\CurrentVersion\Policies\System", true); if (key != null) { key.DeleteValue("DisableTaskMgr", false); key.Close(); } } public static int KeyBoardHookProc(int nCode, int wParam, IntPtr lParam) { if (nCode >= 0) { var kbh = (KeyBoardHookStruct) Marshal.PtrToStructure(lParam, typeof(KeyBoardHookStruct)); if (kbh.vkCode == 91) // 截获左win(开始菜单键) return 1; if (kbh.vkCode == 92) // 截获右win return 1; if (kbh.vkCode == (int) Keys.Escape && (int) Control.ModifierKeys == (int) Keys.Control) //截获Ctrl+Esc return 1; if (kbh.vkCode == (int) Keys.F4 && (int) Control.ModifierKeys == (int) Keys.Alt) //截获alt+f4 return 1; if (kbh.vkCode == (int) Keys.Tab && (int) Control.ModifierKeys == (int) Keys.Alt) //截获alt+tab return 1; if (kbh.vkCode == (int) Keys.Escape && (int) Control.ModifierKeys == (int) Keys.Control + (int) Keys.Shift) //截获Ctrl+Shift+Esc return 1; if (kbh.vkCode == (int) Keys.Space && (int) Control.ModifierKeys == (int) Keys.Alt) //截获alt+空格 return 1; if (kbh.vkCode == 241) //截获F1 return 1; if (kbh.vkCode == (int) Keys.Control && kbh.vkCode == (int) Keys.Alt && kbh.vkCode == (int) Keys.Delete) return 1; if ((int) Control.ModifierKeys == (int) Keys.Control + (int) Keys.Alt + (int) Keys.Delete ) //截获Ctrl+Alt+Delete return 1; if ((int) Control.ModifierKeys == (int) Keys.Control + (int) Keys.Shift) //截获Ctrl+Shift return 1; } return CallNextHookEx(hHook, nCode, wParam, lParam); } #region IDisposable 成员 public void Dispose() { Close(); } #endregion }
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