Windows Mobile 讯息钩子（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。