一个hook锁屏幕出错.

Question

一运行就说抛出出错.是怎么回事呢?
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Reflection;namespace HookTest
{
    /// <summary>
    /// Description of MainForm.
    /// </summary>
    public partial class MainForm : Form
    {
        //委托
        public delegate int HookProc(int nCode, IntPtr wParam, IntPtr lParam);
        static int hHook = 0;
        public const int WH_KEYBOARD_LL = 13;
        //LowLevel键盘截获，如果是WH_KEYBOARD＝2，并不能对系统键盘截取，Acrobat Reader会在你截取之前获得键盘。
        HookProc KeyBoardHookProcedure;
        //键盘Hook结构函数
        [StructLayout(LayoutKind.Sequential)]
        public class KeyBoardHookStruct
        {
            public int vkCode;
            public int scanCode;
            public int flags;
            public int time;
            public int dwExtraInfo;
        }
        #region DllImport
        //设置钩子
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        //抽掉钩子
        public static extern bool UnhookWindowsHookEx(int idHook);
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        //调用下一个钩子
        public static extern int CallNextHookEx(int idHook, int nCode, IntPtr wParam, IntPtr lParam);
        #endregion
        #region 自定义事件
        public void Hook_Start()
        {
            // 安装键盘钩子
            if (hHook == 0)
            {
                 KeyBoardHookProcedure = new HookProc(KeyBoardHookProc);
               
                hHook = SetWindowsHookEx(WH_KEYBOARD_LL,
                            KeyBoardHookProcedure,
                            Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]), 0);                //如果设置钩子失败.
                if (hHook == 0)
                {
                    Hook_Clear();
                    throw new Exception("设置Hook失败!");
                }
            }
        }        //取消钩子事件
        public void Hook_Clear()
        {
            bool 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.");
        }        //这里可以添加自己想要的信息处理
        public static int KeyBoardHookProc(int nCode, IntPtr wParam, IntPtr lParam)
        {
            if (nCode >= 0)
            {
                KeyBoardHookStruct kbh = (KeyBoardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyBoardHookStruct));
                if (kbh.vkCode == (int)Keys.S && (int)Control.ModifierKeys == (int)Keys.Control)  // 截获F8
                {
                    MessageBox.Show("快捷键已拦截!不能保存!");
                    return 1;
                   
                }
                if (kbh.vkCode == (int)Keys.Y
                   && (int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Alt)  //截获Ctrl+Alt+Y
                {
                    About msg = new About();
                    msg.Show();
                    //MessageBox.Show("不能全部保存!");
                    return 1;
                }
                if (kbh.vkCode == (int)Keys.X)
                {
                MessageBox.Show("不能全部保存!");
                     return 1;
                }
            }
            return CallNextHookEx(hHook, nCode, wParam, lParam);
        }
        #endregion
        
        /*
        [STAThread]
        public static void Main(string[] args)
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new MainForm());
        }
        */        public MainForm()
        {
            //
            // The InitializeComponent() call is required for Windows Forms designer support.
            //
            InitializeComponent();
            //
            // TODO: Add constructor code after the InitializeComponent() call.
            //
           
        }        void Start_BtnClick(object sender, EventArgs e)
        {
            this.Hook_Start();
        }        void Clear_BtnClick(object sender, EventArgs e)
        {
            this.Hook_Clear();
        } 
    }
}

Answer 1

利用Hook屏蔽鼠标及键盘一分钟示例 
http://dl2.csdn.net/down4/20080321/21232150801.exe鼠标键盘钩子源码
http://blog.csdn.net/wzuomin/archive/2007/06/18/1656315.aspx

Answer 2

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Reflection;
using System.Diagnostics;namespace WindowsApplication1
{
    ///  <summary> 
    /// Description of MainForm. 
    ///  </summary> 
    public partial class Form4 : Form
    {
        //委托 
        public delegate int HookProc(int nCode, int wParam, IntPtr lParam);
        static int hHook = 0;
        public const int WH_KEYBOARD_LL = 13;
        //LowLevel键盘截获，如果是WH_KEYBOARD＝2，并不能对系统键盘截取，Acrobat Reader会在你截取之前获得键盘。 
        HookProc KeyBoardHookProcedure;
        //键盘Hook结构函数 
        [StructLayout(LayoutKind.Sequential)]
        public class KeyBoardHookStruct
        {
            public int vkCode;
            public int scanCode;
            public int flags;
            public int time;
            public int dwExtraInfo;
        }
        #region DllImport
        //设置钩子 
        [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)]
        //抽掉钩子 
        public static extern bool UnhookWindowsHookEx(int idHook);
        [DllImport("user32.dll")]
        //调用下一个钩子 
        public static extern int CallNextHookEx(int idHook, int nCode, int wParam, IntPtr lParam);        [DllImport("kernel32.dll")]
        public static extern int GetCurrentThreadId();         [DllImport("kernel32.dll")]
        public static extern IntPtr GetModuleHandle(string name);
        
        #endregion
        #region 自定义事件
        public void Hook_Start()
        {
            // 安装键盘钩子 
            if (hHook == 0)
            {
                KeyBoardHookProcedure = new HookProc(KeyBoardHookProc);                //hHook = SetWindowsHookEx(2,
                //            KeyBoardHookProcedure,
                //           GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), GetCurrentThreadId());                hHook = SetWindowsHookEx(WH_KEYBOARD_LL,
                          KeyBoardHookProcedure,
                         GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), 0);                //如果设置钩子失败. 
                if (hHook == 0)
                {
                    Hook_Clear();
                    //throw new Exception("设置Hook失败!");
                }
            }
        }        //取消钩子事件 
        public void Hook_Clear()
        {
            bool 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.");
        }        //这里可以添加自己想要的信息处理 
        public static int KeyBoardHookProc(int nCode, int wParam, IntPtr lParam)
        {
            if (nCode >= 0)
            {
                KeyBoardHookStruct kbh = (KeyBoardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyBoardHookStruct));
                if (kbh.vkCode == (int)Keys.S && (int)Control.ModifierKeys == (int)Keys.Control)  // 截获F8 
                {
                    MessageBox.Show("快捷键已拦截!不能保存!");
                    return 1;                }
                if (kbh.vkCode == (int)Keys.Y
                   && (int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Alt)  //截获Ctrl+Alt+Y 
                {                    //MessageBox.Show("不能全部保存!"); 
                    return 1;
                }
                if (kbh.vkCode == (int)Keys.X)
                {
                    MessageBox.Show("不能全部保存!");
                    return 1;
                }
            }
            return CallNextHookEx(hHook, nCode, wParam, lParam);
        }
        #endregion        public Form4()
        {            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            Hook_Start();
        }        private void button2_Click(object sender, EventArgs e)
        {
            Hook_Clear();
        }    }
}