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;
using System.Runtime.InteropServices;

namespace GlobalMouseHook
{
public class MouseHook
{
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;

//全局的事件
public event MouseEventHandler OnMouseActivity;

static int hMouseHook = 0; //鼠标钩子句柄

//鼠标常量
public const int WH_MOUSE_LL  = 14; //mouse hook constant

HookProc MouseHookProcedure; //声明鼠标钩子事件类型.

//声明一个Point的封送类型
[StructLayout(LayoutKind.Sequential)]
public class POINT
{
public int x;
public int y;
}

//声明鼠标钩子的封送结构类型
[StructLayout(LayoutKind.Sequential)]
public class MouseHookStruct
{
public POINT pt;
public int hWnd;
public int wHitTestCode;
public int dwExtraInfo;
}

//装置钩子的函数
[DllImport("user32.dll",CharSet=CharSet.Auto, CallingConvention=CallingConvention.StdCall)]
public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);

//卸下钩子的函数
[DllImport("user32.dll",CharSet=CharSet.Auto, CallingConvention=CallingConvention.StdCall)]
public static extern bool UnhookWindowsHookEx(int idHook);

//下一个钩挂的函数
[DllImport("user32.dll",CharSet=CharSet.Auto, CallingConvention=CallingConvention.StdCall)]
public static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam);

public delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);

/// <summary>
/// 墨认的构造函数构造当前类的实例.
/// </summary>
public MouseHook()
{
}

//析构函数.
~MouseHook()
{
Stop();
}

public void Start()
{
//安装鼠标钩子
if(hMouseHook == 0)
{
//生成一个HookProc的实例.
MouseHookProcedure = new HookProc(MouseHookProc);

hMouseHook = SetWindowsHookEx( WH_MOUSE_LL, MouseHookProcedure, Marshal.GetHINSTANCE(System.Reflection.Assembly.GetExecutingAssembly().GetModules()[0]), 0);

//如果装置失败停止钩子
if(hMouseHook == 0 )
{
Stop();
throw new Exception("SetWindowsHookEx failed.");
}
}
}

public void Stop()
{
bool retMouse =true;
if(hMouseHook != 0)
{
retMouse = UnhookWindowsHookEx(hMouseHook);
hMouseHook = 0;
}

//如果卸下钩子失败
if (!(retMouse)) throw new Exception("UnhookWindowsHookEx failed.");
}

private int MouseHookProc(int nCode, Int32 wParam, IntPtr lParam)
{
//如果正常运行并且用户要监听鼠标的消息
if ((nCode >= 0) && (OnMouseActivity!=null))
{
MouseButtons button=MouseButtons.None;
int clickCount=0;

switch (wParam)
{
case WM_LBUTTONDOWN:
button=MouseButtons.Left;
clickCount=1;
break;
case WM_LBUTTONUP:
button=MouseButtons.Left;
clickCount=1;
break;
case WM_LBUTTONDBLCLK:
button=MouseButtons.Left;
clickCount=2;
break;
case WM_RBUTTONDOWN:
button=MouseButtons.Right;
clickCount=1;
break;
case WM_RBUTTONUP:
button=MouseButtons.Right;
clickCount=1;
break;
case WM_RBUTTONDBLCLK:
button=MouseButtons.Right;
clickCount=2;
break;
}

//从回调函数中得到鼠标的信息
MouseHookStruct MyMouseHookStruct = (MouseHookStruct) Marshal.PtrToStructure(lParam, typeof(MouseHookStruct));
MouseEventArgs e=new MouseEventArgs(button, clickCount, MyMouseHookStruct.pt.x, MyMouseHookStruct.pt.y, 0 );
//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
OnMouseActivity(this, e);
}
return CallNextHookEx(hMouseHook, nCode, wParam, lParam);
}
}
}

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
{
MouseHook mouse = new MouseHook();
public Form1()
{
InitializeComponent();
mouse.OnMouseActivity += new MouseEventHandler(mouse_OnMouseActivity);
mouse.Start();
}

void mouse_OnMouseActivity(object sender, MouseEventArgs e)
{
string str = "X:" + e.X + "  Y:" + e.Y;
this.Text = str;
}
}

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

转自：http://blog.csdn.net/sohighthesky/archive/2009/04/15/4074757.aspx