C# 键盘钩子

#region   禁用系统按键
public partial class KBHook : Application
{
private struct KBDLLHOOKSTRUCT
{
public int vkCode;
int scanCode;
public int flags;
int time;
int dwExtraInfo;
}

private delegate int LowLevelKeyboardProcDelegate(int nCode, int wParam, ref KBDLLHOOKSTRUCT lParam);

//禁用系统ctrl alt delete

//其他组合按键钩子
[DllImport("user32.dll")]
private static extern IntPtr SetWindowsHookEx(int idHook, LowLevelKeyboardProcDelegate lpfn, IntPtr hMod, int dwThreadId);

[DllImport("user32.dll")]
private static extern bool UnhookWindowsHookEx(IntPtr hHook);

[DllImport("user32.dll")]
private static extern int CallNextHookEx(int hHook, int nCode, int wParam, ref KBDLLHOOKSTRUCT lParam);

[DllImport("kernel32.dll")]
private static extern IntPtr GetModuleHandle(IntPtr path);

private IntPtr hHook;
LowLevelKeyboardProcDelegate hookProc; // prevent gc
const int WH_KEYBOARD_LL = 13;

public KBHook()
{
// hook keyboard
IntPtr hModule = GetModuleHandle(IntPtr.Zero);
hookProc = new LowLevelKeyboardProcDelegate(LowLevelKeyboardProc);
hHook = SetWindowsHookEx(WH_KEYBOARD_LL, hookProc, hModule, 0);
if (hHook == IntPtr.Zero)
{
MessageBox.Show("Failed to set hook, error = " + Marshal.GetLastWin32Error());
}
}

protected override void OnExit(ExitEventArgs e)
{
UnhookWindowsHookEx(hHook); // release keyboard hook
base.OnExit(e);
}

private static int LowLevelKeyboardProc(int nCode, int wParam, ref KBDLLHOOKSTRUCT lParam)
{
if (nCode >= 0)
switch (wParam)
{
case 256: // WM_KEYDOWN
case 257: // WM_KEYUP
case 260: // WM_SYSKEYDOWN
case 261: // M_SYSKEYUP
if (
(lParam.vkCode == 0x09 && lParam.flags == 32) || // Alt+Tab
(lParam.vkCode == 0x1b && lParam.flags == 32) || // Alt+Esc
(lParam.vkCode == 0x73 && lParam.flags == 32) || // Alt+F4
(lParam.vkCode == 0x20 && lParam.flags == 32) || // Alt+Space
(lParam.vkCode == 0x1b && lParam.flags == 0) || // Ctrl+Esc

(lParam.vkCode == 0x2e && (((lParam.flags & 32) == 32) && (lParam.flags & 0) == 0)) || // Ctrl+Alt+Delete
(lParam.vkCode == 0x5b && lParam.flags == 1) || // Left Windows Key
(lParam.vkCode == 0x5c && lParam.flags == 1))    // Right Windows Key
{
return 1;
}
break;
}
return CallNextHookEx(0, nCode, wParam, ref lParam);
}
}
#endregion