/***************************************************************** 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); } // msghookThe 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; } 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。
