深入解析钩子和动态链接库(下)

王朝vc·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

/****************************************************************

* clearMyHook

* Inputs:

* HWND hWnd: Window whose hook is to be cleared

* Result: BOOL

* TRUE if the hook is properly unhooked

* FALSE if you gave the wrong parameter

* Effect:

* Removes the hook that has been set.

****************************************************************/

__declspec(dllexport) BOOL clearMyHook(HWND hWnd)

{

if(hWnd != hWndServer)

return FALSE;

BOOL unhooked = UnhookWindowsHookEx(hook);

if(unhooked)

hWndServer = NULL;

return unhooked;

}

/****************************************************************

* msghook

* Inputs:

* int nCode: Code value

* WPARAM wParam: parameter

* LPARAM lParam: parameter

* Result: LRESULT

*

* Effect:

* If the message is a mouse-move message, posts it back to

* the server window with the mouse coordinates

* Notes:

* This must be a CALLBACK function or it will not work!

****************************************************************/

static LRESULT CALLBACK msghook(int nCode, WPARAM wParam, LPARAM lParam)

{

// If the value of nCode is < 0, just pass it on and return 0

// this is required by the specification of hook handlers

if(nCode < 0)

{ /* pass it on */

CallNextHookEx(hook, nCode,

wParam, lParam);

return 0;

} /* pass it on */

// Read the documentation to discover what WPARAM and LPARAM

// mean. For a WH_MESSAGE hook, LPARAM is specified as being

// a pointer to a MSG structure, so the code below makes that

// structure available

LPMSG msg = (LPMSG)lParam;

// If it is a mouse-move message, either in the client area or

// the non-client area, we want to notify the parent that it has

// occurred. Note the use of PostMessage instead of SendMessage

if(msg->message == WM_MOUSEMOVE ||

msg->message == WM_NCMOUSEMOVE)

PostMessage(hWndServer,

UWM_MOUSEMOVE,

0, 0);

// Pass the message on to the next hook

return CallNextHookEx(hook, nCode,

wParam, lParam);

} // msghook

The server application

在头文件中,将下面的增加到类的protected段:

afx_msg LRESULT OnMyMouseMove(WPARAM,LPARAM);

在application 文件中, 增加以下代码到文件前部。

UINT UWM_MOUSEMOVE = ::RegisterWindowMessage(UWM_MOUSEMOVE_MSG);

在 MESSAGE_MAP, 增加以下代码

//{AFX_MSG comments:

ON_REGISTERED_MESSAGE(UWM_MOUSEMOVE, OnMyMouseMove)

In your application file, add the following function:

LRESULT CMyClass::OnMyMouseMove(WPARAM, LPARAM)

{

// ...do stuff here

return 0;

}

[/url]

[url=http://www.worldlingo.com/wl/mstranslate/UP26384/T1/P2/l/microsoft/computer_translation.html?wl_lp=EN-ZH_CN&wl_fl=2&wl_rurl=http%3A%2F%2Fwww.codeproject.com%2Fdll%2Fhooks.asp&wl_url=http%3A%2F%2Fwww.codeproject.com%2Fdll%2Fhooks%2Fhook.zip] 上面是我写的一个小程序。既然我为了钩子花了n+1st 时间,我干脆给它一个好的用户界面。 猫在窗口之内盯着老鼠。小心! 当老鼠足够接近猫时并且它将捉住老鼠!

你可以下载这个项目并建立它。 真正的关键是DLL 子工程项目; 其他的都不过是陪衬。有几个其它的技术被用在这个例子里,包括各种各样的图画技术, ClipCursor 和 SetCapture的用法,区域选择、屏幕更新等等。,因此除了展示钩子函数的使用以外,对初级程序员掌握窗口样式设计编程也有一些价值。

 
 
 
免责声明:本文为网络用户发布,其观点仅代表作者个人观点,与本站无关,本站仅提供信息存储服务。文中陈述内容未经本站证实,其真实性、完整性、及时性本站不作任何保证或承诺,请读者仅作参考,并请自行核实相关内容。
 
 
© 2005- 王朝網路 版權所有 導航