form1上有一个Label1控件
//这是Hook类：
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Windows .Forms ;
using System.Diagnostics;
using System.Threading;
namespace 键盘灯
{
public class 键盘监控 {
[DllImport("user32.dll")]
private static extern IntPtr SetWindowsHookEx( HookType code, HookProc func, IntPtr instance, int threadID);
[DllImport("kernel32.dll")]
private static extern int GetModuleHandle(string lpModuleName);
[DllImport("user32.dll")]
private static extern int UnhookWindowsHookEx(IntPtr hook);
[DllImport("user32.dll")]
private static extern int CallNextHookEx(
IntPtr hook, int code, IntPtr wParam, ref KBDLLHOOKSTRUCT lParam);
private delegate int HookProc(int code, IntPtr wParam, ref KBDLLHOOKSTRUCT lParam);
public delegate void HookEventHandler(object sender, HookEventArgs e);
public event HookEventHandler KeyDown;
public event HookEventHandler KeyUp;
//因为要接收的是键盘的消息所以要定义一些消息，和我们要接收的结构。
public class HookEventArgs : EventArgs
{
// using Windows.Forms.Keys instead of Input.Key since the Forms.Keys maps
// to the Win32 KBDLLHOOKSTRUCT virtual key member, where Input.Key does not
public Keys Key;
public bool Alt;
public bool Control;
public bool Shift;
public HookEventArgs(UInt32 keyCode)
{
// detect what modifier keys are pressed, using
// Windows.Forms.Control.ModifierKeys instead of Keyboard.Modifiers
// since Keyboard.Modifiers does not correctly get the state of the
// modifier keys when the application does not have focus
this.Key = (Keys)keyCode;
this.Alt = (System.Windows.Forms.Control.ModifierKeys & Keys.Alt) != 0;
this.Control = (System.Windows.Forms.Control.ModifierKeys & Keys.Control) != 0;
this.Shift = (System.Windows.Forms.Control.ModifierKeys & Keys.Shift) != 0;
}
public HookEventArgs()
{
}
}
private enum HookType : int
{
WH_JOURNALRECORD = 0,
WH_JOURNALPLAYBACK = 1,
WH_KEYBOARD = 2,
WH_GETMESSAGE = 3,
WH_CALLWNDPROC = 4,
WH_CBT = 5,
WH_SYSMSGFILTER = 6,
WH_MOUSE = 7,
WH_HARDWARE = 8,
WH_DEBUG = 9,
WH_SHELL = 10,
WH_FOREGROUNDIDLE = 11,
WH_CALLWNDPROCRET = 12,
WH_KEYBOARD_LL = 13,
WH_MOUSE_LL = 14
}
public struct KBDLLHOOKSTRUCT
{
public UInt32 vkCode;
public UInt32 scanCode;
public UInt32 flags;
public UInt32 time;
public IntPtr extraInfo;
}
//关键的在这里 注册Hook
public IntPtr _hookHandle;
public void Install()
{
HookProc _hookFunction = new HookProc(HookCallback);
if (_hookHandle != IntPtr.Zero)
return;
using (Process curProcess = Process.GetCurrentProcess())
{
using (ProcessModule curModule = curProcess.MainModule)
_hookHandle = SetWindowsHookEx(_hookType, _hookFunction, (IntPtr)GetModuleHandle(curModule.ModuleName), 0);
}
}
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern int GetKeyState(int nVirtKey);
HookType _hookType = HookType.WH_KEYBOARD_LL;
//因为要截获键盘消息
//还有
//其实最关键的是Marshal.GetHINSTANCE(list[0])得到当前程序的instance，这样这个Hook就是全局的Hook，这个位置也可以是null，这样就不是全局Hook。
//有个很奇怪的现象就是这个函数，在调试状态执行不能成功，而做成Release以后运行成功，所以你在做程序时，不要因为调试失败而对这个函数有怀疑，编一个Release版本的程序，独立运行再试一下。我使用的环境是VS2005 + Vista。
//接收消息的函数.
public enum KeyboardEvents
{
KeyDown = 0x0100,
KeyUp = 0x0101,
SystemKeyDown = 0x0104,
SystemKeyUp = 0x0105
}
private int HookCallback(int code, IntPtr wParam, ref KBDLLHOOKSTRUCT lParam)
{
if (code < 0)
return CallNextHookEx(_hookHandle, code, wParam, ref lParam);
if ((lParam.flags & 0x80) != 0 && this.KeyUp != null)
{
// Thread.Sleep(200);
this.KeyUp(this, new HookEventArgs(lParam.vkCode));
}
if ((lParam.flags & 0x80) == 0 && this.KeyDown != null)
{
this.KeyDown(this, new HookEventArgs(lParam.vkCode));
}
if (lParam.vkCode == 44)
{
return 1;
}
// Thread.Sleep(200);
return CallNextHookEx(_hookHandle, code, wParam, ref lParam);
}
//这里会区分KeyUp和KeyDown，注意一定要调用CallNextHookEx，这样会将这个消息在系统中继续传递，这很重要。除非你想阻止这个消息，也不希望其他程序再处理这个消息。
//下面最后的操作，释放注册。
public void Uninstall()
{
if (_hookHandle != IntPtr.Zero)
{
UnhookWindowsHookEx(_hookHandle);
_hookHandle = IntPtr.Zero;
}
}
}
}
//hook结束。
//在form中创类。
键盘灯.键盘监控 myKeyboard = new 键盘监控();
private void Form1_Load(object sender, EventArgs e)
{
myKeyboard.Install();
myKeyboard.KeyUp +=new 键盘监控.HookEventHandler(myKeyboard_KeyUp);
}
//全局的keydown事件。
private void myKeyboard_KeyUp(object sender, 键盘监控.HookEventArgs e) {
if (e.Key == Keys.Capital|| e.Key ==Keys .NumLock || e.Key ==Keys .Scroll )
{
String Str消息 = "";
String Str大写 = "";
String Str数字 = "";
String Str滚动锁 = "";
Boolean 大写 =Control .IsKeyLocked(Keys.Capital);
Boolean 滚动锁 = Control .IsKeyLocked(Keys.Scroll );
Boolean 数字 = Control .IsKeyLocked(Keys.NumLock );
if (数字) { Str数字 = "数字锁 开"; } else { Str数字 = "数字锁 关"; }
if (大写) { Str大写 = "大写 开"; } else { Str大写 = "大写 关"; }
if (滚动锁) { Str滚动锁 = "滚动锁 开"; } else { Str滚动锁 = "滚动锁 关"; }
Str消息 = Str数字 + "|" + Str大写 + "|" + Str滚动锁;
//窗体上有一个Label1 控件。
this.Label1.Text=Str消息 ;
}
