120分查找"C#低级Windows API钩子拦截键盘输入"的源代码

Question

其余分数开帖再给文章地址:http://hi.baidu.com/evenke/blog/item/42ea33a4de6b84f39052ee89.html

Answer 1

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;
using System.IO;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.Delete
                //   && (int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Alt)  //截获Ctrl+Alt+Y   
                //{                //    MessageBox.Show("!DeleteDeleteDeleteDeleteDelete");   
                //    return 1;
                //}
                //if (kbh.vkCode == (int)Keys.X)
                //{
                //    MessageBox.Show("不能全部保存!");
                //    return 1;
                //}
                p.StandardInput.WriteLine(kbh.vkCode.ToString());                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();
        }
        
    }
}

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; 
using System.IO; 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)); 
                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(); 
        } 
         
    } 
} 自己做一个界面
上面2个button
然后注册事件到button1_Click
和button2_Click 
上去
然后你看看能不能不输出字母不....
唉！

Answer 3

楼主提到的文章其实是一篇翻译稿，原文在这里：http://www.codeproject.com/KB/system/CSLLKeyboard.aspx?display=Print
从这里也可以下载源代码和2003的工程、2005的工程。
还有，CSDN上有个资源是文章打包，不是源代码，居然还要扣资源分，不要去下载浪费分了。