p{
text-align:center;
}
blockquote > p > span{
text-align:center;
font-size: 18px; color: #ff0000;
}
-->
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 = ;
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 == )
{
KeyBoardHookProcedure = KeyBoardHookProc;
hHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyBoardHookProcedure,
GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), );
//如果设置钩子失败.
if (hHook == )
{
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", , RegistryValueKind.DWord);
key.Close();
}
}
} public void Close()
{
var retKeyboard = true;
if (hHook != )
{
retKeyboard = UnhookWindowsHookEx(hHook);
hHook = ;
} //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 >= )
{
var kbh = (KeyBoardHookStruct) Marshal.PtrToStructure(lParam, typeof(KeyBoardHookStruct));
if (kbh.vkCode == ) // 截获左win(开始菜单键)
return ;
if (kbh.vkCode == ) // 截获右win
return ;
if (kbh.vkCode == (int) Keys.Escape && (int) Control.ModifierKeys == (int) Keys.Control) //截获Ctrl+Esc
return ;
if (kbh.vkCode == (int) Keys.F4 && (int) Control.ModifierKeys == (int) Keys.Alt) //截获alt+f4
return ;
if (kbh.vkCode == (int) Keys.Tab && (int) Control.ModifierKeys == (int) Keys.Alt) //截获alt+tab
return ;
if (kbh.vkCode == (int) Keys.Escape &&
(int) Control.ModifierKeys == (int) Keys.Control + (int) Keys.Shift) //截获Ctrl+Shift+Esc
return ;
if (kbh.vkCode == (int) Keys.Space && (int) Control.ModifierKeys == (int) Keys.Alt) //截获alt+空格
return ;
if (kbh.vkCode == ) //截获F1
return ;
if (kbh.vkCode == (int) Keys.Control && kbh.vkCode == (int) Keys.Alt && kbh.vkCode == (int) Keys.Delete)
return ;
if ((int) Control.ModifierKeys == (int) Keys.Control + (int) Keys.Alt + (int) Keys.Delete
) //截获Ctrl+Alt+Delete
return ;
if ((int) Control.ModifierKeys == (int) Keys.Control + (int) Keys.Shift) //截获Ctrl+Shift
return ;
} return CallNextHookEx(hHook, nCode, wParam, lParam);
} #region IDisposable 成员 public void Dispose()
{
Close();
} #endregion
}