Windows Mobile 讯息钩子（1）

Windows Mobile 消息钩子（1）

    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。

一、定义参数

#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;   

二、实现代码

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; } 

三、消息回调函数

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); } 

   Windows Mobile下不使用DLL也可以实现全局键盘钩子）

   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。