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。

 

这里给出一个我写的示范代码：windows mobile系统钩子示范(C++)