本文实例讲述了C#实现可捕获几乎所有键盘鼠标事件的钩子类。分享给大家供大家参考，具体如下：

using System; using System.Text; using System.Runtime.InteropServices; using System.Reflection; using System.Windows.Forms; namespace MouseKeyboardLibrary { /// <summary> /// Abstract base class for Mouse and Keyboard hooks /// </summary> public abstract class GlobalHook { #region Windows API Code [StructLayout(LayoutKind.Sequential)] protected class POINT { public int x; public int y; } [StructLayout(LayoutKind.Sequential)] protected class MouseHookStruct { public POINT pt; public int hwnd; public int wHitTestCode; public int dwExtraInfo; } [StructLayout(LayoutKind.Sequential)] protected class MouseLLHookStruct { public POINT pt; public int mouseData; public int flags; public int time; public int dwExtraInfo; } [StructLayout(LayoutKind.Sequential)] protected 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)] protected static extern int SetWindowsHookEx( int idHook, HookProc lpfn, IntPtr hMod, int dwThreadId); [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall, SetLastError = true)] protected static extern int UnhookWindowsHookEx(int idHook); [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)] protected static extern int CallNextHookEx( int idHook, int nCode, int wParam, IntPtr lParam); [DllImport("user32")] protected static extern int ToAscii( int uVirtKey, int uScanCode, byte[] lpbKeyState, byte[] lpwTransKey, int fuState); [DllImport("user32")] protected static extern int GetKeyboardState(byte[] pbKeyState); [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)] protected static extern short GetKeyState(int vKey); protected delegate int HookProc(int nCode, int wParam, IntPtr lParam); protected const int WH_MOUSE_LL = 14; protected const int WH_KEYBOARD_LL = 13; protected const int WH_MOUSE = 7; protected const int WH_KEYBOARD = 2; protected const int WM_MOUSEMOVE = 0x200; protected const int WM_LBUTTONDOWN = 0x201; protected const int WM_RBUTTONDOWN = 0x204; protected const int WM_MBUTTONDOWN = 0x207; protected const int WM_LBUTTONUP = 0x202; protected const int WM_RBUTTONUP = 0x205; protected const int WM_MBUTTONUP = 0x208; protected const int WM_LBUTTONDBLCLK = 0x203; protected const int WM_RBUTTONDBLCLK = 0x206; protected const int WM_MBUTTONDBLCLK = 0x209; protected const int WM_MOUSEWHEEL = 0x020A; protected const int WM_KEYDOWN = 0x100; protected const int WM_KEYUP = 0x101; protected const int WM_SYSKEYDOWN = 0x104; protected const int WM_SYSKEYUP = 0x105; protected const byte VK_SHIFT = 0x10; protected const byte VK_CAPITAL = 0x14; protected const byte VK_NUMLOCK = 0x90; protected const byte VK_LSHIFT = 0xA0; protected const byte VK_RSHIFT = 0xA1; protected const byte VK_LCONTROL = 0xA2; protected const byte VK_RCONTROL = 0x3; protected const byte VK_LALT = 0xA4; protected const byte VK_RALT = 0xA5; protected const byte LLKHF_ALTDOWN = 0x20; #endregion #region Private Variables protected int _hookType; protected int _handleToHook; protected bool _isStarted; protected HookProc _hookCallback; #endregion #region Properties public bool IsStarted { get { return _isStarted; } } #endregion #region Constructor public GlobalHook() { Application.ApplicationExit += new EventHandler(Application_ApplicationExit); } #endregion #region Methods public void Start() { if (!_isStarted && _hookType != 0) { // Make sure we keep a reference to this delegate! // If not, GC randomly collects it, and a NullReference exception is thrown _hookCallback = new HookProc(HookCallbackProcedure); _handleToHook = SetWindowsHookEx( _hookType, _hookCallback, //Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]), 0); IntPtr.Zero; // Were we able to sucessfully start hook? if (_handleToHook != 0) { _isStarted = true; } } } public void Stop() { if (_isStarted) { UnhookWindowsHookEx(_handleToHook); _isStarted = false; } } protected virtual int HookCallbackProcedure(int nCode, Int32 wParam, IntPtr lParam) { // This method must be overriden by each extending hook return 0; } protected void Application_ApplicationExit(object sender, EventArgs e) { if (_isStarted) { Stop(); } } #endregion } }

using System; using System.Text; using System.Windows.Forms; using System.Runtime.InteropServices; namespace MouseKeyboardLibrary { /// <summary> /// Captures global keyboard events /// </summary> public class KeyboardHook : GlobalHook { #region Events public event KeyEventHandler KeyDown; public event KeyEventHandler KeyUp; public event KeyPressEventHandler KeyPress; #endregion #region Constructor public KeyboardHook() { _hookType = WH_KEYBOARD_LL; } #endregion #region Methods protected override int HookCallbackProcedure(int nCode, int wParam, IntPtr lParam) { bool handled = false; if (nCode > -1 && (KeyDown != null || KeyUp != null || KeyPress != null)) { KeyboardHookStruct keyboardHookStruct = (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct)); // Is Control being held down? bool control = ((GetKeyState(VK_LCONTROL) & 0x80) != 0) || ((GetKeyState(VK_RCONTROL) & 0x80) != 0); // Is Shift being held down? bool shift = ((GetKeyState(VK_LSHIFT) & 0x80) != 0) || ((GetKeyState(VK_RSHIFT) & 0x80) != 0); // Is Alt being held down? bool alt = ((GetKeyState(VK_LALT) & 0x80) != 0) || ((GetKeyState(VK_RALT) & 0x80) != 0); // Is CapsLock on? bool capslock = (GetKeyState(VK_CAPITAL) != 0); // Create event using keycode and control/shift/alt values found above KeyEventArgs e = new KeyEventArgs( (Keys)( keyboardHookStruct.vkCode | (control ? (int)Keys.Control : 0) | (shift ? (int)Keys.Shift : 0) | (alt ? (int)Keys.Alt : 0) )); // Handle KeyDown and KeyUp events switch (wParam) { case WM_KEYDOWN: case WM_SYSKEYDOWN: if (KeyDown != null) { KeyDown(this, e); handled = handled || e.Handled; } break; case WM_KEYUP: case WM_SYSKEYUP: if (KeyUp != null) { KeyUp(this, e); handled = handled || e.Handled; } break; } // Handle KeyPress event if (wParam == WM_KEYDOWN && !handled && !e.SuppressKeyPress && KeyPress != null) { byte[] keyState = new byte[256]; byte[] inBuffer = new byte[2]; GetKeyboardState(keyState); if (ToAscii(keyboardHookStruct.vkCode, keyboardHookStruct.scanCode, keyState, inBuffer, keyboardHookStruct.flags) == 1) { char key = (char)inBuffer[0]; if ((capslock ^ shift) && Char.IsLetter(key)) key = Char.ToUpper(key); KeyPressEventArgs e2 = new KeyPressEventArgs(key); KeyPress(this, e2); handled = handled || e.Handled; } } } if (handled) { return 1; } else { return CallNextHookEx(_handleToHook, nCode, wParam, lParam); } } #endregion } }

using System; using System.Text; using System.Runtime.InteropServices; using System.Windows.Forms; namespace MouseKeyboardLibrary { /// <summary> /// Standard Keyboard Shortcuts used by most applications /// </summary> public enum StandardShortcut { Copy, Cut, Paste, SelectAll, Save, Open, New, Close, Print } /// <summary> /// Simulate keyboard key presses /// </summary> public static class KeyboardSimulator { #region Windows API Code const int KEYEVENTF_EXTENDEDKEY = 0x1; const int KEYEVENTF_KEYUP = 0x2; [DllImport("user32.dll")] static extern void keybd_event(byte key, byte scan, int flags, int extraInfo); #endregion #region Methods public static void KeyDown(Keys key) { keybd_event(ParseKey(key), 0, 0, 0); } public static void KeyUp(Keys key) { keybd_event(ParseKey(key), 0, KEYEVENTF_KEYUP, 0); } public static void KeyPress(Keys key) { KeyDown(key); KeyUp(key); } public static void SimulateStandardShortcut(StandardShortcut shortcut) { switch (shortcut) { case StandardShortcut.Copy: KeyDown(Keys.Control); KeyPress(Keys.C); KeyUp(Keys.Control); break; case StandardShortcut.Cut: KeyDown(Keys.Control); KeyPress(Keys.X); KeyUp(Keys.Control); break; case StandardShortcut.Paste: KeyDown(Keys.Control); KeyPress(Keys.V); KeyUp(Keys.Control); break; case StandardShortcut.SelectAll: KeyDown(Keys.Control); KeyPress(Keys.A); KeyUp(Keys.Control); break; case StandardShortcut.Save: KeyDown(Keys.Control); KeyPress(Keys.S); KeyUp(Keys.Control); break; case StandardShortcut.Open: KeyDown(Keys.Control); KeyPress(Keys.O); KeyUp(Keys.Control); break; case StandardShortcut.New: KeyDown(Keys.Control); KeyPress(Keys.N); KeyUp(Keys.Control); break; case StandardShortcut.Close: KeyDown(Keys.Alt); KeyPress(Keys.F4); KeyUp(Keys.Alt); break; case StandardShortcut.Print: KeyDown(Keys.Control); KeyPress(Keys.P); KeyUp(Keys.Control); break; } } static byte ParseKey(Keys key) { // Alt, Shift, and Control need to be changed for API function to work with them switch (key) { case Keys.Alt: return (byte)18; case Keys.Control: return (byte)17; case Keys.Shift: return (byte)16; default: return (byte)key; } } #endregion } }

using System; using System.Text; using System.Windows.Forms; using System.Runtime.InteropServices; namespace MouseKeyboardLibrary { /// <summary> /// Captures global mouse events /// </summary> public class MouseHook : GlobalHook { #region MouseEventType Enum private enum MouseEventType { None, MouseDown, MouseUp, DoubleClick, MouseWheel, MouseMove } #endregion #region Events public event MouseEventHandler MouseDown; public event MouseEventHandler MouseUp; public event MouseEventHandler MouseMove; public event MouseEventHandler MouseWheel; public event EventHandler Click; public event EventHandler DoubleClick; #endregion #region Constructor public MouseHook() { _hookType = WH_MOUSE_LL; } #endregion #region Methods protected override int HookCallbackProcedure(int nCode, int wParam, IntPtr lParam) { if (nCode > -1 && (MouseDown != null || MouseUp != null || MouseMove != null)) { MouseLLHookStruct mouseHookStruct = (MouseLLHookStruct)Marshal.PtrToStructure(lParam, typeof(MouseLLHookStruct)); MouseButtons button = GetButton(wParam); MouseEventType eventType = GetEventType(wParam); MouseEventArgs e = new MouseEventArgs( button, (eventType == MouseEventType.DoubleClick ? 2 : 1), mouseHookStruct.pt.x, mouseHookStruct.pt.y, (eventType == MouseEventType.MouseWheel ? (short)((mouseHookStruct.mouseData >> 16) & 0xffff) : 0)); // Prevent multiple Right Click events (this probably happens for popup menus) if (button == MouseButtons.Right && mouseHookStruct.flags != 0) { eventType = MouseEventType.None; } switch (eventType) { case MouseEventType.MouseDown: if (MouseDown != null) { MouseDown(this, e); } break; case MouseEventType.MouseUp: if (Click != null) { Click(this, new EventArgs()); } if (MouseUp != null) { MouseUp(this, e); } break; case MouseEventType.DoubleClick: if (DoubleClick != null) { DoubleClick(this, new EventArgs()); } break; case MouseEventType.MouseWheel: if (MouseWheel != null) { MouseWheel(this, e); } break; case MouseEventType.MouseMove: if (MouseMove != null) { MouseMove(this, e); } break; default: break; } } return CallNextHookEx(_handleToHook, nCode, wParam, lParam); } private MouseButtons GetButton(Int32 wParam) { switch (wParam) { case WM_LBUTTONDOWN: case WM_LBUTTONUP: case WM_LBUTTONDBLCLK: return MouseButtons.Left; case WM_RBUTTONDOWN: case WM_RBUTTONUP: case WM_RBUTTONDBLCLK: return MouseButtons.Right; case WM_MBUTTONDOWN: case WM_MBUTTONUP: case WM_MBUTTONDBLCLK: return MouseButtons.Middle; default: return MouseButtons.None; } } private MouseEventType GetEventType(Int32 wParam) { switch (wParam) { case WM_LBUTTONDOWN: case WM_RBUTTONDOWN: case WM_MBUTTONDOWN: return MouseEventType.MouseDown; case WM_LBUTTONUP: case WM_RBUTTONUP: case WM_MBUTTONUP: return MouseEventType.MouseUp; case WM_LBUTTONDBLCLK: case WM_RBUTTONDBLCLK: case WM_MBUTTONDBLCLK: return MouseEventType.DoubleClick; case WM_MOUSEWHEEL: return MouseEventType.MouseWheel; case WM_MOUSEMOVE: return MouseEventType.MouseMove; default: return MouseEventType.None; } } #endregion } }

using System; using System.Text; using System.Runtime.InteropServices; using System.Drawing; using System.Windows.Forms; namespace MouseKeyboardLibrary { /// <summary> /// And X, Y point on the screen /// </summary> public struct MousePoint { public MousePoint(Point p) { X = p.X; Y = p.Y; } public int X; public int Y; public static implicit operator Point(MousePoint p) { return new Point(p.X, p.Y); } } /// <summary> /// Mouse buttons that can be pressed /// </summary> public enum MouseButton { Left = 0x2, Right = 0x8, Middle = 0x20 } /// <summary> /// Operations that simulate mouse events /// </summary> public static class MouseSimulator { #region Windows API Code [DllImport("user32.dll")] static extern int ShowCursor(bool show); [DllImport("user32.dll")] static extern void mouse_event(int flags, int dX, int dY, int buttons, int extraInfo); const int MOUSEEVENTF_MOVE = 0x1; const int MOUSEEVENTF_LEFTDOWN = 0x2; const int MOUSEEVENTF_LEFTUP = 0x4; const int MOUSEEVENTF_RIGHTDOWN = 0x8; const int MOUSEEVENTF_RIGHTUP = 0x10; const int MOUSEEVENTF_MIDDLEDOWN = 0x20; const int MOUSEEVENTF_MIDDLEUP = 0x40; const int MOUSEEVENTF_WHEEL = 0x800; const int MOUSEEVENTF_ABSOLUTE = 0x8000; #endregion #region Properties /// <summary> /// Gets or sets a structure that represents both X and Y mouse coordinates /// </summary> public static MousePoint Position { get { return new MousePoint(Cursor.Position); } set { Cursor.Position = value; } } /// <summary> /// Gets or sets only the mouse's x coordinate /// </summary> public static int X { get { return Cursor.Position.X; } set { Cursor.Position = new Point(value, Y); } } /// <summary> /// Gets or sets only the mouse's y coordinate /// </summary> public static int Y { get { return Cursor.Position.Y; } set { Cursor.Position = new Point(X, value); } } #endregion #region Methods /// <summary> /// Press a mouse button down /// </summary> /// <param name="button"></param> public static void MouseDown(MouseButton button) { mouse_event(((int)button), 0, 0, 0, 0); } public static void MouseDown(MouseButtons button) { switch (button) { case MouseButtons.Left: MouseDown(MouseButton.Left); break; case MouseButtons.Middle: MouseDown(MouseButton.Middle); break; case MouseButtons.Right: MouseDown(MouseButton.Right); break; } } /// <summary> /// Let a mouse button up /// </summary> /// <param name="button"></param> public static void MouseUp(MouseButton button) { mouse_event(((int)button) * 2, 0, 0, 0, 0); } public static void MouseUp(MouseButtons button) { switch (button) { case MouseButtons.Left: MouseUp(MouseButton.Left); break; case MouseButtons.Middle: MouseUp(MouseButton.Middle); break; case MouseButtons.Right: MouseUp(MouseButton.Right); break; } } /// <summary> /// Click a mouse button (down then up) /// </summary> /// <param name="button"></param> public static void Click(MouseButton button) { MouseDown(button); MouseUp(button); } public static void Click(MouseButtons button) { switch (button) { case MouseButtons.Left: Click(MouseButton.Left); break; case MouseButtons.Middle: Click(MouseButton.Middle); break; case MouseButtons.Right: Click(MouseButton.Right); break; } } /// <summary> /// Double click a mouse button (down then up twice) /// </summary> /// <param name="button"></param> public static void DoubleClick(MouseButton button) { Click(button); Click(button); } public static void DoubleClick(MouseButtons button) { switch (button) { case MouseButtons.Left: DoubleClick(MouseButton.Left); break; case MouseButtons.Middle: DoubleClick(MouseButton.Middle); break; case MouseButtons.Right: DoubleClick(MouseButton.Right); break; } } /// <summary> /// Show a hidden current on currently application /// </summary> public static void Show() { ShowCursor(true); } /// <summary> /// Hide mouse cursor only on current application's forms /// </summary> public static void Hide() { ShowCursor(false); } #endregion } }

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using MouseKeyboardLibrary; namespace SampleApplication { /* 上面的5个类编译成Dll引用,使用例子 */ public partial class HookTestForm : Form { MouseHook mouseHook = new MouseHook(); KeyboardHook keyboardHook = new KeyboardHook(); public HookTestForm() { InitializeComponent(); } private void TestForm_Load(object sender, EventArgs e) { mouseHook.MouseMove += new MouseEventHandler(mouseHook_MouseMove); mouseHook.MouseDown += new MouseEventHandler(mouseHook_MouseDown); mouseHook.MouseUp += new MouseEventHandler(mouseHook_MouseUp); mouseHook.MouseWheel += new MouseEventHandler(mouseHook_MouseWheel); keyboardHook.KeyDown += new KeyEventHandler(keyboardHook_KeyDown); keyboardHook.KeyUp += new KeyEventHandler(keyboardHook_KeyUp); keyboardHook.KeyPress += new KeyPressEventHandler(keyboardHook_KeyPress); mouseHook.Start(); keyboardHook.Start(); SetXYLabel(MouseSimulator.X, MouseSimulator.Y); } void keyboardHook_KeyPress(object sender, KeyPressEventArgs e) { AddKeyboardEvent( "KeyPress", "", e.KeyChar.ToString(), "", "", "" ); } void keyboardHook_KeyUp(object sender, KeyEventArgs e) { AddKeyboardEvent( "KeyUp", e.KeyCode.ToString(), "", e.Shift.ToString(), e.Alt.ToString(), e.Control.ToString() ); } void keyboardHook_KeyDown(object sender, KeyEventArgs e) { AddKeyboardEvent( "KeyDown", e.KeyCode.ToString(), "", e.Shift.ToString(), e.Alt.ToString(), e.Control.ToString() ); } void mouseHook_MouseWheel(object sender, MouseEventArgs e) { AddMouseEvent( "MouseWheel", "", "", "", e.Delta.ToString() ); } void mouseHook_MouseUp(object sender, MouseEventArgs e) { AddMouseEvent( "MouseUp", e.Button.ToString(), e.X.ToString(), e.Y.ToString(), "" ); } void mouseHook_MouseDown(object sender, MouseEventArgs e) { AddMouseEvent( "MouseDown", e.Button.ToString(), e.X.ToString(), e.Y.ToString(), "" ); } void mouseHook_MouseMove(object sender, MouseEventArgs e) { SetXYLabel(e.X, e.Y); } void SetXYLabel(int x, int y) { curXYLabel.Text = String.Format("Current Mouse Point: X={0}, y={1}", x, y); } void AddMouseEvent(string eventType, string button, string x, string y, string delta) { listView1.Items.Insert(0, new ListViewItem( new string[]{ eventType, button, x, y, delta })); } void AddKeyboardEvent(string eventType, string keyCode, string keyChar, string shift, string alt, string control) { listView2.Items.Insert(0, new ListViewItem( new string[]{ eventType, keyCode, keyChar, shift, alt, control })); } private void TestForm_FormClosed(object sender, FormClosedEventArgs e) { // Not necessary anymore, will stop when application exits //mouseHook.Stop(); //keyboardHook.Stop(); } } }

希望本文所述对大家C#程序设计有所帮助。