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
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。