少しの知識、大きな挑戦！この記事は、「プログラマーに必要な知識」の作成に参加しています。
このカプセル化されたクラスを使用して、最初にフックを登録してから、対応するマウスイベントを追加します。マウスイベントが呼び出され、渡されたパラメータがマウス処理関数MouseHookProc（int nCode、Int32 wParam、IntPtr lParam）で完了すると、この例では、マウス処理はパラメータを必要としないため、左ボタンまたは左ボタンが押された場合右クリックすると、最初に定義されたMouseEventArgパラメータクラスの他のプロパティが0に割り当てられます。マウス処理関数MouseHookProcは、マウスフック登録メソッドで呼び出されます。
class MouseHook
{
//枚举定义
public enum WH_Codes : int
{
/// <summary>
/// 底层鼠标钩子
/// </summary>
WH_MOUSE_LL = 14
}
public enum WM_MOUSE : int
{
/// <summary>
/// 鼠标开始
/// </summary>
WM_MOUSEFIRST = 0x200,
/// <summary>
/// 鼠标移动
/// </summary>
WM_MOUSEMOVE = 0x200,
/// <summary>
/// 左键按下
/// </summary>
WM_LBUTTONDOWN = 0x201,
/// <summary>
/// 左键释放
/// </summary>
WM_LBUTTONUP = 0x202,
/// <summary>
/// 左键双击
/// </summary>
WM_LBUTTONDBLCLK = 0x203,
/// <summary>
/// 右键按下
/// </summary>
WM_RBUTTONDOWN = 0x204,
/// <summary>
/// 右键释放
/// </summary>
WM_RBUTTONUP = 0x205,
/// <summary>
/// 右键双击
/// </summary>
WM_RBUTTONDBLCLK = 0x206,
/// <summary>
/// 中键按下
/// </summary>
WM_MBUTTONDOWN = 0x207,
/// <summary>
/// 中键释放
/// </summary>
WM_MBUTTONUP = 0x208,
/// <summary>
/// 中键双击
/// </summary>
WM_MBUTTONDBLCLK = 0x209,
/// <summary>
/// 滚轮滚动
/// </summary>
/// <remarks>WINNT4.0以上才支持此消息</remarks>
WM_MOUSEWHEEL = 0x020A
}
[StructLayout(LayoutKind.Sequential)]
public struct POINT
{
public int X;
public int Y;
}
/// <summary>
/// 鼠标钩子事件结构定义
/// </summary>
/// <remarks>详细说明请参考MSDN中关于 MSLLHOOKSTRUCT 的说明</remarks>
[StructLayout(LayoutKind.Sequential)]
public struct MouseHookStruct
{
public POINT Point;
public UInt32 MouseData;
public UInt32 Flags;
public UInt32 Time;
public UInt32 ExtraInfo;
}
#region DLL导入
/// <summary>
/// 安装钩子
/// </summary>
/// <param name="idHook"></param>
/// <param name="lpfn"></param>
/// <param name="hInstance"></param>
/// <param name="threadId"></param>
/// <returns></returns>
[DllImport("user32.dll", CallingConvention = CallingConvention.StdCall)]
public static extern IntPtr SetWindowsHookEx(WH_Codes idHook, HookProc lpfn,
IntPtr pInstance, int threadId);
/// <summary>
/// 卸载钩子
/// </summary>
/// <param name="idHook"></param>
/// <returns></returns>
[DllImport("user32.dll", CallingConvention = CallingConvention.StdCall)]
public static extern bool UnhookWindowsHookEx(IntPtr pHookHandle);
/// <summary>
/// 传递钩子
/// </summary>
/// <param name="idHook"></param>
/// <param name="nCode"></param>
/// <param name="wParam"></param>
/// <param name="lParam"></param>
/// <returns></returns>
[DllImport("user32.dll", CallingConvention = CallingConvention.StdCall)]
public static extern int CallNextHookEx(IntPtr pHookHandle, int nCode,
Int32 wParam, IntPtr lParam);
#endregion DLL导入
//鼠标钩子句柄
private IntPtr m_pMouseHook = IntPtr.Zero;
/// <summary>
/// 钩子委托声明
/// </summary>
/// <param name="nCode"></param>
/// <param name="wParam"></param>
/// <param name="lParam"></param>
/// <returns></returns>
public delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);
/// <summary>
/// 鼠标钩子委托实例
/// </summary>
/// <remarks>
/// 不要试图省略此变量,否则将会导致
/// 激活 CallbackOnCollectedDelegate 托管调试助手 (MDA)。
/// 详细请参见MSDN中关于 CallbackOnCollectedDelegate 的描述
/// </remarks>
private HookProc m_MouseHookProcedure;
#region 事件定义
/// <summary>
/// 鼠标移动事件
/// </summary>
/// <remarks>当鼠标移动或者滚轮滚动时触发</remarks>
public event MouseEventHandler OnMouseMove;
/// <summary>
/// 鼠标按下事件
/// </summary>
public event MouseEventHandler OnMouseDown;
/// <summary>
/// 按键释放事件
/// </summary>
public event MouseEventHandler OnMouseUp;
#endregion
#region 私有方法
/// <summary>
/// 鼠标钩子处理函数
/// </summary>
/// <param name="nCode"></param>
/// <param name="wParam"></param>
/// <param name="lParam"></param>
/// <returns></returns>
private int MouseHookProc(int nCode, Int32 wParam, IntPtr lParam)
{
if ((nCode >= 0) && (this.OnMouseMove != null)
&& (wParam == (int)WM_MOUSE.WM_MOUSEMOVE ||wParam == (int)WM_MOUSE.WM_MOUSEWHEEL))
{
//MouseHookStruct MouseInfo = (MouseHookStruct)Marshal.PtrToStructure(lParam, typeof(MouseHookStruct));
this.OnMouseMove(null,null);
}
if ((nCode >= 0) && (this.OnMouseDown != null)&&(wParam==(int)WM_MOUSE.WM_LBUTTONDOWN||wParam==(int)WM_MOUSE.WM_RBUTTONDOWN))
{
MouseButtons button = MouseButtons.None;
switch (wParam)
{
case (int)WM_MOUSE.WM_LBUTTONDOWN:
//case WM_LBUTTONUP:
//case WM_LBUTTONDBLCLK:
button = MouseButtons.Left;
break;
case (int)WM_MOUSE.WM_RBUTTONDOWN:
//case WM_RBUTTONUP:
//case WM_RBUTTONDBLCLK:
button = MouseButtons.Right;
break;
}
MouseEventArgs e = new MouseEventArgs(
button,
0,
0,
0,
0
);
this.OnMouseDown(null, e);
}
if ((nCode >= 0) && (this.OnMouseDown != null)
&& (wParam == (int)WM_MOUSE.WM_LBUTTONUP || wParam == (int)WM_MOUSE.WM_RBUTTONUP))
{
MouseButtons button = MouseButtons.None;
switch (wParam)
{
case (int)WM_MOUSE.WM_LBUTTONUP:
//case WM_LBUTTONUP:
//case WM_LBUTTONDBLCLK:
button = MouseButtons.Left;
break;
case (int)WM_MOUSE.WM_RBUTTONUP:
//case WM_RBUTTONUP:
//case WM_RBUTTONDBLCLK:
button = MouseButtons.Right;
break;
}
MouseEventArgs e = new MouseEventArgs(
button,
0,
0,
0,
0
);
this.OnMouseUp(null, e);
}
return CallNextHookEx(this.m_pMouseHook, nCode, wParam, lParam);
}
#endregion
#region 公共方法
/// <summary>
/// 安装钩子
/// </summary>
/// <returns></returns>
public bool InstallHook()
{
IntPtr pInstance = Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().ManifestModule);
//pInstance = (IntPtr)4194304;
// IntPtr pInstanc2 = Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly());
// Assembly.GetExecutingAssembly().GetModules()[0]
// 假如没有安装鼠标钩子
if (this.m_pMouseHook == IntPtr.Zero)
{
this.m_MouseHookProcedure = new HookProc(this.MouseHookProc);
this.m_pMouseHook = SetWindowsHookEx(WH_Codes.WH_MOUSE_LL, this.m_MouseHookProcedure, pInstance, 0);
if (this.m_pMouseHook == IntPtr.Zero)
{
this.UnInstallHook();
return false;
}
}
return true;
}
/// <summary>
/// 卸载钩子
/// </summary>
/// <returns></returns>
public bool UnInstallHook()
{
bool result = true;
if (this.m_pMouseHook != IntPtr.Zero)
{
result = (UnhookWindowsHookEx(this.m_pMouseHook) && result);
this.m_pMouseHook = IntPtr.Zero;
}
return result;
}
#endregion
}
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