Windows Mobile 上使用键盘钩子

最近做的项目涉及Wince 按键的Hook操作，需要屏蔽挂机键和一些系统按键。

在Windows中，设置键盘钩子很多人都做过，但是在windows Mobile系统中并没有直接的函数支持。但是我们可以通过使用undocument api来实现。

首先定义一些参数




#define WH_KEYBOARD_LL 20


#define HC_ACTION 0






typedef LRESULT (CALLBACK* HOOKPROC)(int code, WPARAM wParam, LPARAM lParam);


typedef HHOOK (WINAPI *_SetWindowsHookExW)(int, HOOKPROC, HINSTANCE, DWORD);


typedef LRESULT (WINAPI *_CallNextHookEx)(HHOOK, int, WPARAM, LPARAM);


typedef LRESULT (WINAPI *_UnhookWindowsHookEx)(HHOOK);






typedef struct ...{


DWORD vkCode;


DWORD scanCode;


DWORD flags;


DWORD time;


ULONG_PTR dwExtraInfo;


} KBDLLHOOKSTRUCT, *PKBDLLHOOKSTRUCT;

static _SetWindowsHookExW SetWindowsHookEx;
static _UnhookWindowsHookEx UnhookWindowsHookEx;
static _CallNextHookEx CallNextHookEx;

然后是实现的代码，LLKeyboardHookCallbackFunction就是回调函数




BOOL ActivateKBHook(HINSTANCE hInstance, HOOKPROC LLKeyboardHookCallbackFunction)




...{


//we need to manually load these standard Win32 API calls


//MSDN states that these aren't supported in WinCE




SetWindowsHookEx = NULL;


CallNextHookEx = NULL;


UnhookWindowsHookEx = NULL;



//从 coredll.dll获取我们需要的函数


g_hHookApiDLL = LoadLibrary(_T("coredll.dll"));


if(g_hHookApiDLL == NULL)




...{


return FALSE;


}


else




...{


SetWindowsHookEx = (_SetWindowsHookExW)GetProcAddress(g_hHookApiDLL, _T("SetWindowsHookExW"));


if(SetWindowsHookEx == NULL)




...{






return FALSE;


}


else




...{




g_hInstalledLLKBDhook = SetWindowsHookEx(WH_KEYBOARD_LL, LLKeyboardHookCallbackFunction, hInstance, 0);


if(g_hInstalledLLKBDhook == NULL)




...{




return FALSE;


}


}






CallNextHookEx = (_CallNextHookEx)GetProcAddress(g_hHookApiDLL, _T("CallNextHookEx"));


if(CallNextHookEx == NULL)




...{




return FALSE;


}






UnhookWindowsHookEx = (_UnhookWindowsHookEx)GetProcAddress(g_hHookApiDLL, _T("UnhookWindowsHookEx"));


if(UnhookWindowsHookEx == NULL)




...{


return FALSE;


}


}






return TRUE;


}






BOOL DeactivateKBHook()




...{


//unload the hook


if(g_hInstalledLLKBDhook != NULL)




...{


UnhookWindowsHookEx(g_hInstalledLLKBDhook);


g_hInstalledLLKBDhook = NULL;


}




//unload the coredll.dll


if(g_hHookApiDLL != NULL)




...{


FreeLibrary(g_hHookApiDLL);


g_hHookApiDLL = NULL;


}




//we have terminated gracefully


return TRUE;


}



一般的回调函数是这么写的，BlockKeyList是需要屏蔽的按键列表


int CLoginDlg::BlockKeyList[] = {VK_TBACK,VK_TTALK,VK_TEND,VK_THOME};



LRESULT CALLBACK CLoginDlg::LLKeyboardHookCallbackFunction(int nCode, WPARAM wParam, LPARAM lParam)




...{


if(nCode >= HC_ACTION)




...{


if(wParam == WM_KEYDOWN || wParam == WM_KEYUP || wParam == WM_LBUTTONDOWN)




...{






int countKeyList = ARRAY_SIZEOF(BlockKeyList);




for(int i=0;i<countKeyList;i++)




...{


if((((KBDLLHOOKSTRUCT*)lParam)->vkCode) == BlockKeyList[i])




...{


return TRUE;


}


}






}


}




return CallNextHookEx(g_hInstalledLLKBDhook, nCode, wParam, lParam);


}

最后还有关键的一点，网上有人说WH_KEYBOARD_LL不需要用DLL就能实现全局钩子，但是我发觉至少在windows mobile的机器上不行，还是要用DLL来实现键盘钩子。

以上的方法在windows mobile 5.0以及6.0上都可以正常使用，如果你只是要屏蔽所有按键的话可以简单的使用EnableHardwareKeyboard函数来实现。