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要截获系统中所有应用程序的消息,必须将钩子函数写在动态连接库中,否则钩子只能截获该应用程序的消息。其实,这个道理很简单,我们看下面这个安装钩子的API:
HHOOK SetWindowsHookEx(
int idHook, // type of hook to install HOOKPROC lpfn, // address of hook procedure HINSTANCE hMod, // handle to application instance DWORD dwThreadId // identity of thread to install hook for ); 注意第三个参数(HINSTANCE hMod)和第四个参数(DWORD dwThreadId),这两个参数指明了一个dll实例句柄和需要截获消息的线程ID。如果hMod为NULL,则必须指定dwThreadId;如果dwThreadId为0则说明钩子对所有线程有效,但此时你必须指定hMod,这是因为一个dll就是一个独立的线程,它独立于其他应用程序,因此可以截获其他线程的消息。 下面这个函数实现了钩子安装:
/////////////////////////////////////////////////////////////////////////////
// The KeyBoard Hook Install Function Implement DllExport void WINAPI InstallHook()
{ g_KeyBoardHook = SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardHookProc, theApp.m_hInstance,0); g_MouseHook = SetWindowsHookEx(WH_MOUSE,(HOOKPROC)MouseHookProc, theApp.m_hInstance,0); } 其中,theApp是dll类的全局对象。
下面这个函数实现了钩子的卸载:
/////////////////////////////////////////////////////////////////////////////
// The KeyBoard Hook UnInstall Function Implement DllExport void WINAPI UnInstallHook()
{ UnhookWindowsHookEx(g_KeyBoardHook); UnhookWindowsHookEx(g_MouseHook); } 下面两个函数分别是键盘和鼠标的钩子函数:
/////////////////////////////////////////////////////////////////////////////
// The KeyBoard & Mouse Hook Function Implement DllExport LRESULT CALLBACK KeyboardHookProc(int nCode, WPARAM wParam, LPARAM lParam)
{ if(nCode == HC_ACTION) { switch(wParam) { case VK_SPACE: if(((GetKeyState(VK_LCONTROL) & 0x8000) != 0) && ((GetKeyState(VK_RSHIFT) & 0x8000) != 0)) { bEatKeystroke = FALSE; bEatMousestroke = FALSE; } break; } } return(bEatKeystroke ? 1 : CallNextHookEx(g_KeyBoardHook,nCode,wParam,lParam));
} DllExport LRESULT CALLBACK MouseHookProc(int nCode, WPARAM wParam, LPARAM lParam)
{ return(bEatMousestroke ? 1 : CallNextHookEx(g_MouseHook,nCode,wParam,lParam)); } 很简单,这里只是判断是否按下了左Ctrl+右Shift+空格,如果是就解锁。
最后,在应用程序中,引入该dll的lib,然后在应用程序的恰当位置调用上面函数安装hook,在适当的位置Uninstall即可。
下面是一个能够在一个时间段锁住键盘和鼠标完整的应用程序:
//TimerLock.h
// head file // declare application class and window class // LionMountainMan // 2005-8-25 class CMyApp : public CWinApp
{ protected: CTime m_time; public: virtual BOOL InitInstance(); virtual int Run(); }; /////////////////////////////////////////////////////////////////////////////////////
// TimerLock.cpp // implement file // implement the timer lock keyboard and mouse function. // LionMountainMan // 2005-8-25 #include <afxwin.h>
#include "TimerLock.h" #include "HookDll.h" CMyApp myApp;
/////////////////////////////////////////////////////////////////////////////////////
//CMyApp member functions BOOL CMyApp::InitInstance()
{ m_time = CTime::GetCurrentTime(); return TRUE; } int CMyApp::Run()
{ BOOL bLock = FALSE; CTime tmAlarm1(m_time.GetYear(),m_time.GetMonth(), \ m_time.GetDay() ,10,30,0); CTime tmCancelAlarm1(m_time.GetYear(),m_time.GetMonth(), \ m_time.GetDay() ,10,40,0); CTime tmAlarm2(m_time.GetYear(),m_time.GetMonth(), \ m_time.GetDay() ,15,30,0); CTime tmCancelAlarm2(m_time.GetYear(),m_time.GetMonth(), \ m_time.GetDay() ,15,40,0); CTime tmAlarm3(m_time.GetYear(),m_time.GetMonth(), \ m_time.GetDay(),12,30,0); CTime tmCancelAlarm3(m_time.GetYear(),m_time.GetMonth(), m_time.GetDay(),13,30,0); CTime tmAlarm4(m_time.GetYear(),m_time.GetMonth(), \ m_time.GetDay(),17,30,0); CTime tmCancelAlarm4(m_time.GetYear(),m_time.GetMonth(), \ m_time.GetDay(),18,0,0); while(1) { m_time = CTime::GetCurrentTime(); if((tmAlarm1 <= m_time && tmCancelAlarm1 >= m_time) || \ (tmAlarm2 <= m_time && tmCancelAlarm2 >= m_time) || \ (tmAlarm3 <= m_time && tmCancelAlarm3 >= m_time) || \ (tmAlarm4 <= m_time && tmCancelAlarm4 >= m_time)) { if(!bLock) { InstallHook(); MessageBox(NULL,"时间到,停止一切操作!","温馨提示",MB_ICONSTOP|MB_TOPMOST); bLock = TRUE; } } else if(bLock) { UnInstallHook(); bLock = FALSE; } Sleep(1000); } return 0; } |
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