Use C # To create a program that can monitor the global mouse position

 

 

First, we need to use the global mouse hook to get the mouse position in the current application, because the focus is not in the current application.

We will first create a new class library globalmousehook,

Then import the namespace: system. Windows. forms;
System. runtime. interopservices;

Rename the class as mousehook. The Code is as follows:

 

Using system. windows. forms; <br/> using system. runtime. interopservices; </P> <p> 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 cons T 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; </P> <p> // global event <br/> public event mouseeventhandler onmouseactivity; </P> <p> static int hmousehook = 0; // mouse hook handle </P> <p> // mouse constant <br/> Public const int wh_mouse_ll = 14; // mouse H Ook constant </P> <p> hookproc mousehookprocedure; // declare the type of the mouse hook event. </P> <p> // declare the mail type of a point <br/> [structlayout (layoutkind. sequential)] <br/> public class point <br/>{< br/> Public int X; <br/> Public int y; <br/>}</P> <p> // declare the delivery structure type of the mouse hook. <br/> [structlayout (layoutkind. sequential)] <br/> public class mousehookstruct <br/> {<br/> Public point pt; <br/> Public int hwnd; <br/> Public int whittestcode; <B R/> Public int dwextrainfo; <br/>}</P> <p> // device hook function <br/> [dllimport ("user32.dll", charset = charset. auto, callingconvention = callingconvention. stdcall)] <br/> Public static extern int setwindowshookex (INT idhook, hookproc lpfn, intptr hinstance, int threadid ); </P> <p> // remove the hook function <br/> [dllimport ("user32.dll", charset = charset. auto, callingconvention = callingconvention. stdcall)] <br/> Public static exter N bool unhookwindowshookex (INT idhook); </P> <p> // function of the next hook <br/> [dllimport ("user32.dll", charset = charset. auto, callingconvention = callingconvention. stdcall)] <br/> Public static extern int callnexthookex (INT idhook, int ncode, int32 wparam, intptr lparam ); </P> <p> Public Delegate int hookproc (INT ncode, int32 wparam, intptr lparam ); </P> <p> /// <summary> <br/> // The constructor of the ink recognition class to construct an instance of the current class. <br/> /// </Summary> <Br/> Public mousehook () <br/>{< br/>}</P> <p> // destructor. <br/> ~ Mousehook () <br/>{< br/> stop (); <br/>}</P> <p> Public void start () <br/>{< br/> // install the mouse hook <br/> If (hmousehook = 0) <br/>{< br/> // generate a hookproc instance. <br/> mousehookprocedure = new hookproc (mousehookproc); </P> <p> hmousehook = setwindowshookex (wh_mouse_ll, mousehookprocedure, Marshal. gethinstance (system. reflection. assembly. getexecutingassembly (). getmodules () [0]), 0); </P> <p> // if the device fails to stop the hook <br/> If (Hmousehook = 0) <br/>{< br/> stop (); <br/> throw new exception ("setwindowshookex failed. "); <br/>}</P> <p> Public void stop () <br/>{< br/> bool retmouse = true; <br/> If (hmousehook! = 0) <br/>{< br/> retmouse = unhookwindowshookex (hmousehook); <br/> hmousehook = 0; <br/>}</P> <p> // If Hook removal fails <br/> If (! (Retmouse) throw new exception ("unhookwindowshookex failed. "); <br/>}</P> <p> private int mousehookproc (INT ncode, int32 wparam, intptr lparam) <br/>{< br/> // if the message is normal and the user wants to listen to the mouse <br/> If (ncode> = 0) & (onmouseactivity! = NULL) <br/>{< br/> mousebuttons button = mousebuttons. none; <br/> int clickcount = 0; </P> <p> 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/>}</P> <p> // obtain the mouse information from the callback function <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; // you can set <br/> onmouseactivity (this, e) here to restrict the moving area of the mouse in the screen ); <br/>}< br/> return callnexthookex (hmousehook, ncode, wparam, lparam); <br/>}< br/>} 

 

 

In this way, a global mouse hook is created. You only need to reference this DLL elsewhere.

Example:

 

 

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/>}</P> <p> void mouse_onmouseactivity (Object sender, mouseeventargs e) <br/>{< br/> string STR = "X: "+ E. X + "Y:" + E. y; <br/> This. TEXT = STR; <br/>}< br/>}

 

In this way, the cursor position can be displayed in the global state, no matter where your focus is or whether your focus is on the current form.

 

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