好久没写了,经历了考试周,现在又解放了。这2天有事,还是没有写,今晚简单整理下,写了个钩子程序玩玩~
记得最早是人人某主页君写的一个钩子程序,作为愚人节礼物发到主页上的。当时觉得好神奇啊~最近在看1200例的书,第二卷一开始就说到了钩子程序,所以迫不及待的敲一遍,改一下,完成了基本功能~屏蔽所有的鼠标左键~哈哈~捉弄人的这是。。。。。。
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在钩子程序中,需要用到几个windows api函数。
//声明钩子函数 [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall, SetLastError = true)] public static extern int SetWindowsHookEx(Int32 HookType, HOOKPROCEDURE methodAddress, IntPtr handler, Int32 dwThreadId); //释放钩子函数 [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall, SetLastError = true)] public static extern bool UnhookWindowsHookEx(IntPtr idHook);
对于第一个函数,四个参数,分别指,钩子类型,消息处理函数地址,句柄(这个不太理解),线程ID
对于第二个函数,只需要指出钩子的句柄就可以了。
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首先,建立一个基本的MouseHook类
class MouseHook { public bool StartHook() { IntPtr InstallHook = IntPtr.Zero; if (this.mouseHandler == IntPtr.Zero) { this.m_MouseHookProcedure = new HOOKPROCEDURE(MouseHookProcedure); //安装钩子函数 this.mouseHandler = (IntPtr)SetWindowsHookEx(WH_MOUSE_LL, this.m_MouseHookProcedure, InstallHook, 0); if (this.mouseHandler == IntPtr.Zero) { this.UnInstallHook(); return false; } } return true; } public bool UnInstallHook() { bool Result = true; if (this.mouseHandler != IntPtr.Zero) { Result = (UnhookWindowsHookEx(this.mouseHandler) && Result); this.mouseHandler = IntPtr.Zero; } return Result; } public IntPtr mouseHandler = IntPtr.Zero; public event MouseEventHandler MouseDown; public static int flag = 0; //声明钩子函数 [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall, SetLastError = true)] public static extern int SetWindowsHookEx(Int32 HookType, HOOKPROCEDURE methodAddress, IntPtr handler, Int32 dwThreadId); //释放钩子函数 [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall, SetLastError = true)] public static extern bool UnhookWindowsHookEx(IntPtr idHook); //声明钩子函数地址 public delegate int HOOKPROCEDURE(int nCode, Int32 wParam, IntPtr IParam); private HOOKPROCEDURE m_MouseHookProcedure; //定义使用户可以控制类或结构的数据字段的物理布局 [StructLayout(LayoutKind.Sequential)] protected class MouseHookStruct { public POINT pt; public int mouseData; public int flags; public int time; public int dwExtraInfo; } [StructLayout(LayoutKind.Sequential)] protected class POINT { public int x; public int y; } //自定义的消息处理函数 private int MouseHookProcedure(int nCode, Int32 wParam, IntPtr IParam) { if (nCode >= 0 && MouseDown != null)//判断是否处理该消息以及是否有鼠标按键被按下 { //定义一个结构体实例 MouseHookStruct mouseHookStruct = (MouseHookStruct)Marshal.PtrToStructure(IParam, typeof(MouseHookStruct)); MouseButtons button = GetButton(wParam);//获鼠标的按键类型 short mouseDelta = 0;//定义一个表示滑轮转动次数的变量 switch (wParam) { case WM_LBUTTONDOWN: case WM_LBUTTONDBLCLK: case WM_LBUTTONUP: button = MouseButtons.Left; flag = 1; break; case WM_RBUTTONDOWN: case WM_RBUTTONDBLCLK: case WM_RBUTTONUP: button = MouseButtons.Right;flag=0; break; case WM_MOUSEWHEEL: flag = 0; mouseDelta = (short)((mouseHookStruct.mouseData >> 16) & 0xffff); break; case WM_MOUSEMOVE: flag = 0; break; } int clickCount = 0; //判断传递消息 表示的鼠标单击次数 if (wParam == WM_LBUTTONDBLCLK || wParam == WM_RBUTTONDBLCLK) clickCount = 2; else clickCount = 1; if (flag != 1) { //定义一个为鼠标事件提供数据的实例 System.Windows.Forms.MouseEventArgs e = new System.Windows.Forms.MouseEventArgs(button, clickCount, mouseHookStruct.pt.x, mouseHookStruct.pt.y, mouseDelta); MouseDown(this, e); } } return flag; } private MouseButtons GetButton(Int32 wParam) { switch (wParam) { case WM_LBUTTONDOWN: case WM_LBUTTONDBLCLK: case WM_LBUTTONUP: return MouseButtons.Left; case WM_RBUTTONDOWN: case WM_RBUTTONDBLCLK: case WM_RBUTTONUP: return MouseButtons.Right; case WM_MBUTTONDBLCLK: case WM_MBUTTONDOWN: case WM_MBUTTONUP: return MouseButtons.Middle; default: return MouseButtons.None; } } public const int WH_MOUSE_LL = 14; public const int WM_MOUSEMOVE = 0x200; public const int WM_LBUTTONDOWN = 0x201; public const int WM_RBUTTONDOWN = 0x204; public const int WM_MBUTTONDOWN = 0x207; public const int WM_LBUTTONUP = 0x202; public const int WM_RBUTTONUP = 0x205; public const int WM_MBUTTONUP = 0x208; public const int WM_LBUTTONDBLCLK = 0x203; public const int WM_RBUTTONDBLCLK = 0x206; public const int WM_MBUTTONDBLCLK = 0x209; public const int WM_MOUSEWHEEL = 0x020A; }
在整个类中,主要通过StartHook和UnInstallHook来控制钩子的开启和关闭。
在挂载钩子的时候,函数调用四个参数分别为: (IntPtr)SetWindowsHookEx(WH_MOUSE_LL, this.m_MouseHookProcedure, InstallHook, 0);
WH_MOUSE_LL是一个const常量,指示钩子的类型,这里表示,此挂钩只能在Windows NT中被安装,用来对底层的鼠标输入事件进行监视。
当然还有其余的值,不同的值代表不同的效果。
第二个参数表示处理函数,第三个,这里给的值为0,同样,第四个线程ID也为0。线程ID填0表示,监测所有的消息,也就导致,就算我不是在当前winform下操作,也会被监测到~(其实这就是我想要的效果~尤记当年某主页君发的钩子程序)
在这个地方,有一个疑问吧,第三个参数,不知道该如何写。按照书上的写法,总是无法安装钩子,但是将其值改为Zero后就可以了。。。。
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写完了hook类,接下来添加winform的代码:
MouseHook mouseHook = new MouseHook(); [DllImport("user32.dll", SetLastError = true)] public static extern bool RegisterHotKey(IntPtr Hwnd, int Id, KeyModifiers keyModifiers, Keys key); [DllImport("user32.dll", SetLastError = true)] public static extern bool UnregisterHotKey(IntPtr Hwnd, int Id); [Flags()] public enum KeyModifiers { None = 0, Alt = 1, Control = 2, } void Mouse_Down(object sender, MouseEventArgs e) { AddMouseValueEvent(e.Button.ToString()); } public void AddMouseValueEvent(string MouseValue) { } private void button1_Click(object sender, EventArgs e) { label1.Text = "F10解除钩子~"; mouseHook.StartHook(); mouseHook.MouseDown += new MouseEventHandler(Mouse_Down); } private void Form1_Load(object sender, EventArgs e) { Clipboard.Clear(); RegisterHotKey(Handle, 100, 0, Keys.F10); } private void Form1_FormClosing(object sender, FormClosingEventArgs e) { UnregisterHotKey(Handle, 100); } protected override void WndProc(ref Message m) { const int WM_Key = 0x312; switch (m.Msg) { case WM_Key: mouseHook.UnInstallHook(); label1.Text = "好玩不~?"; break; } base.WndProc(ref m); }
这里的Mouse_Down和AddMouseValueEvent仅仅做消息传递的功能。
而,由于点击开始后,鼠标左键被我屏蔽了(mouseHook类中的消息处理,如果是鼠标左边,不进行MouseDown的消息传递)。所以,再添加一个系统热键F10进行解除屏蔽。这里使用了WndProc的重载,来过滤消息。
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这样的钩子程序,不好给图演示效果。说一下这些代码的效果吧。当单机button之后,鼠标左键就再也没用了。就如同坏掉了一样。。。。右键和滑轮还是好的,可以使用。就算右键激活了其余的窗体,而不在HookLTest窗体下,鼠标左键一样没有效果~最后,只能按F10解除。
但是,发觉这个代码还是可能存在问题。我经常性的运行后,资源管理器都有问题,最后都得重启资源管理器。不知道这个是由什么导致的。望知道的可以指点下。。。。
然后,对于那个WH_MOUSE_LL。其实,还有别的值,不同的值对应不同的效果,看个人的需要吧。
嘿嘿,Hook是捉弄人的好神器啊~