使用c#创建一个可以监视全局鼠标位置的程序

首先要在焦点不在当前应用程序中也要获得鼠标位置，我们就需要使用全局鼠标钩子

我们先新建一个类库GlobalMouseHook，

然后导入命名空间：System.Windows.Forms;
System.Runtime.InteropServices;

将类重命名为MouseHook，其代码如下：

using System.Windows.Forms;<br />using System.Runtime.InteropServices;<br /><br />namespace GlobalMouseHook<br />{<br /> public class MouseHook<br /> {<br /> private const int WM_MOUSEMOVE = 0x200;<br /> private const int WM_LBUTTONDOWN = 0x201;<br /> private const int WM_RBUTTONDOWN = 0x204;<br /> private const int WM_MBUTTONDOWN = 0x207;<br /> private const int WM_LBUTTONUP = 0x202;<br /> private const int WM_RBUTTONUP = 0x205;<br /> private const int WM_MBUTTONUP = 0x208;<br /> private const int WM_LBUTTONDBLCLK = 0x203;<br /> private const int WM_RBUTTONDBLCLK = 0x206;<br /> private const int WM_MBUTTONDBLCLK = 0x209;<br /><br /> //全局的事件<br /> public event MouseEventHandler OnMouseActivity;<br /><br /> static int hMouseHook = 0; //鼠标钩子句柄<br /><br /> //鼠标常量<br /> public const int WH_MOUSE_LL = 14; //mouse hook constant<br /><br /> HookProc MouseHookProcedure; //声明鼠标钩子事件类型.<br /><br /> //声明一个Point的封送类型<br /> [StructLayout(LayoutKind.Sequential)]<br /> public class POINT <br /> {<br /> public int x;<br /> public int y;<br /> }<br /><br /> //声明鼠标钩子的封送结构类型<br /> [StructLayout(LayoutKind.Sequential)]<br /> public class MouseHookStruct <br /> {<br /> public POINT pt;<br /> public int hWnd;<br /> public int wHitTestCode;<br /> public int dwExtraInfo;<br /> }<br /><br /> //装置钩子的函数<br /> [DllImport("user32.dll",CharSet=CharSet.Auto, CallingConvention=CallingConvention.StdCall)]<br /> public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);<br /><br /> //卸下钩子的函数<br /> [DllImport("user32.dll",CharSet=CharSet.Auto, CallingConvention=CallingConvention.StdCall)]<br /> public static extern bool UnhookWindowsHookEx(int idHook);<br /><br /> //下一个钩挂的函数<br /> [DllImport("user32.dll",CharSet=CharSet.Auto, CallingConvention=CallingConvention.StdCall)]<br /> public static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam); <br /><br /> public delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);<br /><br /> /// <summary><br /> /// 墨认的构造函数构造当前类的实例.<br /> /// </summary><br /> public MouseHook() <br /> {<br /> }<br /><br /> //析构函数.<br /> ~MouseHook() <br /> { <br /> Stop();<br /> } <br /><br /> public void Start()<br /> {<br /> //安装鼠标钩子<br /> if(hMouseHook == 0)<br /> {<br /> //生成一个HookProc的实例.<br /> MouseHookProcedure = new HookProc(MouseHookProc);<br /><br /> hMouseHook = SetWindowsHookEx( WH_MOUSE_LL, MouseHookProcedure, Marshal.GetHINSTANCE(System.Reflection.Assembly.GetExecutingAssembly().GetModules()[0]), 0);<br /><br /> //如果装置失败停止钩子<br /> if(hMouseHook == 0 ) <br /> {<br /> Stop();<br /> throw new Exception("SetWindowsHookEx failed.");<br /> }<br /> }<br /> }<br /><br /> public void Stop()<br /> {<br /> bool retMouse =true;<br /> if(hMouseHook != 0)<br /> {<br /> retMouse = UnhookWindowsHookEx(hMouseHook);<br /> hMouseHook = 0;<br /> } <br /><br /> //如果卸下钩子失败<br /> if (!(retMouse)) throw new Exception("UnhookWindowsHookEx failed.");<br /> }<br /><br /> private int MouseHookProc(int nCode, Int32 wParam, IntPtr lParam)<br /> {<br /> //如果正常运行并且用户要监听鼠标的消息<br /> if ((nCode >= 0) && (OnMouseActivity!=null)) <br /> { <br /> MouseButtons button=MouseButtons.None;<br /> int clickCount=0;<br /><br /> switch (wParam)<br /> {<br /> case WM_LBUTTONDOWN: <br /> button=MouseButtons.Left; <br /> clickCount=1;<br /> break;<br /> case WM_LBUTTONUP: <br /> button=MouseButtons.Left; <br /> clickCount=1;<br /> break;<br /> case WM_LBUTTONDBLCLK: <br /> button=MouseButtons.Left; <br /> clickCount=2;<br /> break;<br /> case WM_RBUTTONDOWN: <br /> button=MouseButtons.Right; <br /> clickCount=1;<br /> break;<br /> case WM_RBUTTONUP: <br /> button=MouseButtons.Right; <br /> clickCount=1;<br /> break;<br /> case WM_RBUTTONDBLCLK: <br /> button=MouseButtons.Right; <br /> clickCount=2;<br /> break;<br /> }<br /><br /> //从回调函数中得到鼠标的信息<br /> MouseHookStruct MyMouseHookStruct = (MouseHookStruct) Marshal.PtrToStructure(lParam, typeof(MouseHookStruct));<br /> MouseEventArgs e=new MouseEventArgs(button, clickCount, MyMouseHookStruct.pt.x, MyMouseHookStruct.pt.y, 0 );<br /> //if(e.X>700)return 1;//如果想要限制鼠标在屏幕中的移动区域可以在此处设置<br /> OnMouseActivity(this, e);<br /> }<br /> return CallNextHookEx(hMouseHook, nCode, wParam, lParam); <br /> }<br /> }<br />}

这样就创建了一个全局的鼠标钩子，我们只需要在其它地方引用 这个dll就可以了

使用示例：

public partial class Form1 : Form<br /> {<br /> MouseHook mouse = new MouseHook();<br /> public Form1()<br /> {<br /> InitializeComponent();<br /> mouse.OnMouseActivity += new MouseEventHandler(mouse_OnMouseActivity);<br /> mouse.Start();<br /> }<br /><br /> void mouse_OnMouseActivity(object sender, MouseEventArgs e)<br /> {<br /> string str = "X:" + e.X + " Y:" + e.Y;<br /> this.Text = str;<br /> }<br /> }

这样这个窗体都可以在全局状态下显示鼠标的位置了，不管你焦点在哪，也不管你焦点是否在当前窗体上