[Release]Sicherheitssoftware für's Afkleveln!

public class KeyHook
{
    private delegate int HookProc(int nCode, IntPtr wParam, IntPtr lParam);

    //Declare hook handle as int.
    static int hHook = 0;

    public static List<Keys> KeyCodes = new List<Keys>();

    //Declare keyboard hook constant.
    //For other hook types, you can obtain these values from Winuser.h in Microsoft SDK.
    const int WH_KEYBOARD_LL = 13;

    HookProc KeyboardHookProcedure;

    [StructLayout(LayoutKind.Sequential)]
    private class keyboardHookStruct
    {
        public int vkCode;
        public int scanCode;
        public int flags;
        public int time;
        public int dwExtraInfo;
    }

    //Import for SetWindowsHookEx function.
    //Use this function to install thread-specific hook.
    [DllImport("user32.dll", CharSet = CharSet.Auto,
     CallingConvention = CallingConvention.StdCall)]
    private static extern int SetWindowsHookEx(int idHook, HookProc lpfn,
    IntPtr hInstance, int threadId);

    //Import for UnhookWindowsHookEx.
    //Call this function to uninstall the hook.
    [DllImport("user32.dll", CharSet = CharSet.Auto,
     CallingConvention = CallingConvention.StdCall)]
    private static extern bool UnhookWindowsHookEx(int idHook);

    //Import for CallNextHookEx.
    //Use this function to pass the hook information to next hook procedure in chain.
    [DllImport("user32.dll", CharSet = CharSet.Auto,
     CallingConvention = CallingConvention.StdCall)]
    private static extern int CallNextHookEx(int idHook, int nCode,
    IntPtr wParam, IntPtr lParam);

    [DllImport("kernel32.dll")]
    static extern IntPtr LoadLibrary(string lpFileName);

    public KeyHook()
    {
        Hook();
    }

    ~KeyHook()
    {
        UnHook();
    }

    public int Hook()
    {
        KeyboardHookProcedure = new HookProc(KeyHook.KeyboardHookProc);

        hHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyboardHookProcedure, (IntPtr)LoadLibrary("User32"), 0);
        return hHook;
    }

    public bool UnHook()
    {
        bool ret = UnhookWindowsHookEx(hHook);
        if (ret)
            hHook = 0;
        return ret;
    }

    private static int KeyboardHookProc(int nCode, IntPtr wParam, IntPtr lParam)
    {
        int key = 0;

        if (nCode < 0)
        {
            return CallNextHookEx(hHook, nCode, wParam, lParam);
        }
        else
        {

            if (((int)wParam == 256) || ((int)wParam == 260))
            {
                keyboardHookStruct MyKeyboardHookStruct = (keyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(keyboardHookStruct));
                KeyCodes.Add((Keys)MyKeyboardHookStruct.vkCode);
                key = MyKeyboardHookStruct.vkCode;
            }

            if (key == 0x5B || key == 0x5C)
                return 1;

            return nCode;
        }
    }
}