VC 中钩子的使用

该例的钩子都是写在一个DLL中的，和应用程序独立开来的全局钩子。

一般情况下，如果要截获鼠标和普通按键，刚可以用下边的方法

鼠标：

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LRESULT CALLBACK MouseProc(             int nCode,      // hook code             WPARAM wParam, // message identifier             LPARAM lParam   // mouse coordinates             ) {     return TRUE; }

键盘：

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LRESULT CALLBACK KeyboardProc(               int code,       // hook code               WPARAM wParam, // virtual-key code               LPARAM lParam   // keystroke-message information               ) {     return TRUE; }

上边这个键盘钩子只能截获普通键，像WIN键、CTRL+ESC什么的是截获不了的，如果要截获这些比较牛的功能键及组合键，那就要用低级键盘钩子了

低级键盘钩子：

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LRESULT CALLBACK LowLevelKeyboardProc(int nCode,                 WPARAM wParam,                 LPARAM lParam                 ) {     if(nCode==HC_ACTION)     {         KBDLLHOOKSTRUCT *kblp=(KBDLLHOOKSTRUCT*)lParam;         BOOL bCtrlKeyDown = GetAsyncKeyState(VK_CONTROL)>>((sizeof(SHORT) * 8) - 1);         if ((kblp->vkCode==VK_ESCAPE && bCtrlKeyDown) || // Ctrl+Esc             // Alt+TAB             (kblp->vkCode==VK_TAB && kblp->flags & LLKHF_ALTDOWN) ||               // Alt+Esc             (kblp->vkCode==VK_ESCAPE && kblp->flags & LLKHF_ALTDOWN)||             (kblp->vkCode==VK_LWIN || kblp->vkCode==VK_RWIN))         {                                   return TRUE; // 不再往CallNextHookEx传递，直接返回         }     }     return CallNextHookEx(g_KeyBoardHook, nCode, wParam, lParam); }

然后通过下边的方法安装和卸载钩子：

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VOID __stdcall InstallHookEv() {     //g_KeyBoardHook = SetWindowsHookEx(WH_KEYBOARD, (HOOKPROC)KeyboardProc, theApp.m_hInstance, 0);     g_LowKeyBoardHook = SetWindowsHookEx(WH_KEYBOARD_LL, (HOOKPROC)LowLevelKeyboardProc, theApp.m_hInstance, 0);     g_MouseHook = SetWindowsHookEx(WH_MOUSE, (HOOKPROC)MouseProc, theApp.m_hInstance, 0); }   VOID __stdcall UninstallHookEv() {     //UnhookWindowsHookEx(g_KeyBoardHook);     UnhookWindowsHookEx(g_LowKeyBoardHook);     UnhookWindowsHookEx(g_MouseHook); }

这些方法中带"g_"的变量都是定义在DLL中这些方法所在的.cpp文件最上边的

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HHOOK g_KeyBoardHook = NULL; HHOOK g_LowKeyBoardHook = NULL; HHOOK g_MouseHook = NULL;