120分查找"C#低级Windows API钩子拦截键盘输入"的源代码
其余分数开帖再给

文章地址:http://hi.baidu.com/evenke/blog/item/42ea33a4de6b84f39052ee89.html


[解决办法]
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！