Windows Mobile 訊息鉤子（1）

    在Windows中，設定鍵盤鉤子很多人都做過，但是在windows Mobile系統中並沒有直接的函數支援。但是我們可以通過使用undocument api來實現。

一、定義參數

 

  
#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、實現代碼

LLKeyboardHookCallbackFunction就是回呼函數

 

  
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; 
  
//從 coredll.dll 擷取我們需要的函數 
  
    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、訊息回呼函數

一般的回呼函數是這麼寫的，BlockKeyList是需要屏蔽的按鍵列表

 

  
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也可以實現全域鍵盤鉤子）

   如果你只是要屏蔽所有按鍵的話可以簡單的使用EnableHardwareKeyboard函數來實現。