c#使用钩子拦截鼠标键盘事件
窗体本身带的键盘鼠标事件函数只能响应窗体自己的事件，窗体之外的事件是不会响应的。比如当窗体最小化的时候也响应就要用全局钩子拦截消息来处理了。
大概过程就是在窗体初始化时加载钩子，等待事件消息，事件触发后调用响应函数处理。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.InteropServices; //DllImport名空间
using System.Windows.Forms; //MouseEventHandler名空间
using System.Reflection; //Assembly名空间
using System.ComponentModel; //Win32Exception名空间
using System.Diagnostics;//PROCESS命名空间
namespace ShieldKeyBoardTouch
{
class MouseKeyHook
{
[StructLayout(LayoutKind.Sequential)]
private class POINT
{
public int x;
public int y;
}
[StructLayout(LayoutKind.Sequential)]
private class MouseHookStruct
{
public POINT pt;
public int hwnd;
public int wHitTestCode;
public int dwExtraInfo;
}
[StructLayout(LayoutKind.Sequential)]
private class MouseLLHookStruct
{
public POINT pt;
public int mouseData;
public int flags;
public int time;
public int dwExtraInfo;
}
[StructLayout(LayoutKind.Sequential)]
private class KeyboardHookStruct
{
public int vkCode;
public int scanCode;
public int flags;
public int time;
public int dwExtraInfo;
}
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall, SetLastError = true)]
private static extern int SetWindowsHookEx( int idHook, HookProc lpfn, IntPtr hMod, int dwThreadId);
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall, SetLastError = true)]
private static extern int UnhookWindowsHookEx(int idHook);
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
private static extern int CallNextHookEx( int idHook, int nCode, int wParam, IntPtr lParam);
private delegate int HookProc(int nCode, int wParam, IntPtr lParam);
[DllImport("user32")]
private static extern int ToAscii( int uVirtKey, int uScanCode, byte[] lpbKeyState, byte[] lpwTransKey, int fuState);
[DllImport("user32")]
private static extern int GetKeyboardState(byte[] pbKeyState);
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
private static extern short GetKeyState(int vKey);
[DllImport("kernel32.dll", EntryPoint = "GetModuleHandleA", SetLastError = true, CharSet = CharSet.Ansi, ThrowOnUnmappableChar = true)]
public static extern IntPtr GetModuleHandleA(String lpModuleName);
[DllImport("kernel32.dll", EntryPoint = "GetModuleHandleW", SetLastError = true, CharSet = CharSet.Unicode, ThrowOnUnmappableChar = true)]
public static extern IntPtr GetModuleHandleW(String lpModuleName);
//消息参数的值
private const int WH_MOUSE_LL = 14;
private const int WH_KEYBOARD_LL = 13;
private const int WH_MOUSE = 7;
private const int WH_KEYBOARD = 2;
private const int WM_MOUSEMOVE = 0x200;
private const int WM_LBUTTONDOWN = 0x201;
private const int WM_RBUTTONDOWN = 0x204;
private const int WM_MBUTTONDOWN = 0x207;
private const int WM_LBUTTONUP = 0x202;
private const int WM_RBUTTONUP = 0x205;
private const int WM_MBUTTONUP = 0x208;
private const int WM_LBUTTONDBLCLK = 0x203;
private const int WM_RBUTTONDBLCLK = 0x206;
private const int WM_MBUTTONDBLCLK = 0x209;
private const int WM_MOUSEWHEEL = 0x020A;
private const int WM_KEYDOWN = 0x100;
private const int WM_KEYUP = 0x101;
private const int WM_SYSKEYDOWN = 0x104;
private const int WM_SYSKEYUP = 0x105;
private const byte VK_SHIFT = 0x10;
private const byte VK_CAPITAL = 0x14;
private const byte VK_NUMLOCK = 0x90;
public MouseKeyHook()
{
Start();
}
public MouseKeyHook(bool InstallMouseHook, bool InstallKeyboardHook)
{
Start(InstallMouseHook, InstallKeyboardHook);
}
~MouseKeyHook()
{
Stop(true, true, false);
}
public event MouseEventHandler OnMouseActivity; //MouseEventHandler是委托，表示处理窗体、控件或其他组件的 MouseDown、MouseUp 或 MouseMove 事件的方法。
public event KeyEventHandler KeyDown;
public event KeyPressEventHandler KeyPress;
public event KeyEventHandler KeyUp;
private int hMouseHook = 0; //标记mouse hook是否安装
private int hKeyboardHook = 0;
private static HookProc MouseHookProcedure;
private static HookProc KeyboardHookProcedure;
//---------------------------------------------------------------------------
public void Start()
{
this.Start(true, true);
}
public void Start(bool InstallMouseHook, bool InstallKeyboardHook)
{
IntPtr HM = Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]);
if (hMouseHook == 0 && InstallMouseHook)
{
MouseHookProcedure = new HookProc(MouseHookProc);//钩子的处理函数
hMouseHook = SetWindowsHookEx(
WH_MOUSE_LL,
MouseHookProcedure,
GetModuleHandleW(Process.GetCurrentProcess().MainModule.ModuleName),//本进程模块句柄
0);
if (hMouseHook == 0)
{
int errorCode = Marshal.GetLastWin32Error();
Stop(true, false, false);
throw new Win32Exception(errorCode);
}
}
if (hKeyboardHook == 0 && InstallKeyboardHook)
{
KeyboardHookProcedure = new HookProc(KeyboardHookProc);
hKeyboardHook = SetWindowsHookEx(
WH_KEYBOARD_LL,
KeyboardHookProcedure,
//Marshal.GetHINSTANCE( Assembly.GetExecutingAssembly().GetModules()[0]),
GetModuleHandleW(Process.GetCurrentProcess().MainModule.ModuleName),
0);
if (hKeyboardHook == 0)
{
int errorCode = Marshal.GetLastWin32Error();
Stop(false, true, false);
throw new Win32Exception(errorCode);
}
}
}
//-------------------------------------------------
public void Stop()
{
this.Stop(true, true, true);
}
public void Stop(bool UninstallMouseHook, bool UninstallKeyboardHook, bool ThrowExceptions)
{
if (hMouseHook != 0 && UninstallMouseHook)
{
int retMouse = UnhookWindowsHookEx(hMouseHook);
hMouseHook = 0;
if (retMouse == 0 && ThrowExceptions)
{
int errorCode = Marshal.GetLastWin32Error();
throw new Win32Exception(errorCode);
}
}
if (hKeyboardHook != 0 && UninstallKeyboardHook)
{
int retKeyboard = UnhookWindowsHookEx(hKeyboardHook);
hKeyboardHook = 0;
if (retKeyboard == 0 && ThrowExceptions)
{
int errorCode = Marshal.GetLastWin32Error();
throw new Win32Exception(errorCode);
}
}
}
//-------------------------------------------------------------------------------
private int MouseHookProc(int nCode, int wParam, IntPtr lParam)
{
if ((nCode >= 0) && (OnMouseActivity != null))
{
MouseLLHookStruct mouseHookStruct = (MouseLLHookStruct)Marshal.PtrToStructure(lParam, typeof(MouseLLHookStruct));
MouseButtons button = MouseButtons.None;
short mouseDelta = 0;
int clickCount = 0;
switch (wParam)
{
case WM_LBUTTONDOWN://513出现了
button = MouseButtons.Left;
clickCount = 1;
break;
case WM_RBUTTONDOWN://516出现了
button = MouseButtons.Right;
clickCount = 1;
break;
case WM_LBUTTONDBLCLK://515 doubleclick没有出现过
button = MouseButtons.XButton1;
clickCount = 2;
break;
case WM_RBUTTONDBLCLK://518
button = MouseButtons.XButton1;
clickCount = 2;
break;
case WM_MOUSEMOVE://512 出现了
button = MouseButtons.XButton2;
clickCount = 0;
break;
case WM_MOUSEWHEEL://522 没试
mouseDelta = (short)((mouseHookStruct.mouseData >> 16) & 0xffff);
clickCount = 0;
break;
}
MouseEventArgs e = new MouseEventArgs(
button,
clickCount,
mouseHookStruct.pt.x,
mouseHookStruct.pt.y,
mouseDelta);
OnMouseActivity(this, e);//转给委托函数
}
return CallNextHookEx(hMouseHook, nCode, wParam, lParam);
}
//------------------------------------------------------------------------------------
private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
{
bool handled = false;
if ((nCode >= 0) && (KeyDown != null || KeyUp != null || KeyPress != null))
{
KeyboardHookStruct MyKeyboardHookStruct = (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));
if (KeyDown != null && (wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN))
{
Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;
KeyEventArgs e = new KeyEventArgs(keyData);
KeyDown(this, e); //转给委托函数
handled = handled || e.Handled;
}
if (KeyPress != null && wParam == WM_KEYDOWN)
{
bool isDownShift = ((GetKeyState(VK_SHIFT) & 0x80) == 0x80 ? true : false);
bool isDownCapslock = (GetKeyState(VK_CAPITAL) != 0 ? true : false);
byte[] keyState = new byte[256];
GetKeyboardState(keyState);
byte[] inBuffer = new byte[2];
if (ToAscii(MyKeyboardHookStruct.vkCode,
MyKeyboardHookStruct.scanCode,
keyState,
inBuffer,
MyKeyboardHookStruct.flags) == 1)
{
char key = (char)inBuffer[0];
if ((isDownCapslock ^ isDownShift) && Char.IsLetter(key)) key = Char.ToUpper(key);
KeyPressEventArgs e = new KeyPressEventArgs(key);
KeyPress(this, e);
handled = handled || e.Handled;
}
}
if (KeyUp != null && (wParam == WM_KEYUP || wParam == WM_SYSKEYUP))
{
Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;
KeyEventArgs e = new KeyEventArgs(keyData);
KeyUp(this, e);
handled = handled || e.Handled;
}
}
if (handled)
return 1;
else
return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);
}
}
}
这个类是用来加载钩子的，然后在窗体中定义委托函数，我只用了keydown和OnMouseActivity，让窗体本身的事件相应函数来处理它们。也可以自己另外写函数处理
public partial class Form1 : Form
{
private MouseKeyHook mouseKeyHook1 = new MouseKeyHook(true,true);//鼠标，键盘
public Form1()
{
InitializeComponent();
mouseKeyHook1.KeyDown += new KeyEventHandler(Form1_KeyDown);
//mouseKeyHook1.KeyPress += new KeyPressEventHandler(mouseKeyHook1_KeyPress);
//mouseKeyHook1.KeyUp += new KeyEventHandler(mouseKeyHook1_KeyUp);
mouseKeyHook1.OnMouseActivity += new MouseEventHandler(Form1_MouseDown);
}
} private void Form1_KeyDown(object sender, KeyEventArgs e)
{
//MessageBox.Show("key down ", "message:", MessageBoxButtons.OK);
LogFileCotent = LogFileCotent + "key down at : " + DateTime.Now.ToString() + " fail\r\n";
textBox1.AppendText("key down at : " + DateTime.Now.ToString());
textBox1.AppendText(Environment.NewLine);
}还有一个问题就是鼠标消息其实没有出现DOUBECLICK的值 ，原因应该也是click在前面被它取代了。解决的办法是利用timer计时两次click时间差，功能得自己写。