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

1. #define WH_KEYBOARD_LL           20 
2. #define HC_ACTION        0 
3. typedef LRESULT(CALLBACK* HOOKPROC)(int code, WPARAM wParam, LPARAM lParam); 
4. typedef HHOOK (WINAPI *_SetWindowsHookExW)(int, HOOKPROC, HINSTANCE, DWORD); 
5. typedef LRESULT (WINAPI *_CallNextHookEx)(HHOOK, int, WPARAM, LPARAM); 
6. typedef LRESULT (WINAPI *_UnhookWindowsHookEx)(HHOOK); 
7. typedef struct 
8. { 
9.     DWORD vkCode; 
10.     DWORD scanCode; 
11.     DWORD flags; 
12.     DWORD time; 
13.     ULONG_PTR dwExtraInfo; 
14. } KBDLLHOOKSTRUCT, *PKBDLLHOOKSTRUCT; 
15.  
16. static _SetWindowsHookExW       SetWindowsHookEx; 
17. static _UnhookWindowsHookEx    UnhookWindowsHookEx; 
18. static _CallNextHookEx                CallNextHookEx;   

二、实现代码

LLKeyboardHookCallbackFunction就是回调函数

1. BOOL ActivateKBHook(HINSTANCE hInstance, 
2.   HOOKPROC LLKeyboardHookCallbackFunction) 
3. { 
4. //we need to manually load these standard Win32 API calls 
5. //MSDN states that these aren''t supported in WinCE 
6.     SetWindowsHookEx        = NULL; 
7.     CallNextHookEx            = NULL; 
8.     UnhookWindowsHookEx        = NULL; 
9. //从 coredll.dll 获取我们需要的函数 
10.     g_hHookApiDLL = LoadLibrary(_T("coredll.dll")); 
11.     if(g_hHookApiDLL == NULL) 
12.    { 
13.         return FALSE; 
14.     } 
15.     else 
16.     { 
17.         SetWindowsHookEx = (_SetWindowsHookExW)GetProcAddress(
18. g_hHookApiDLL, _T("SetWindowsHookExW")); 
19.         if(SetWindowsHookEx == NULL) 
20.         { 
21.             return FALSE; 
22.         } 
23.         else 
24.         { 
25.             g_hInstalledLLKBDhook = SetWindowsHookEx(WH_KEYBOARD_LL,
26.  LLKeyboardHookCallbackFunction, hInstance, 0); 
27.             if(g_hInstalledLLKBDhook == NULL) 
28.             { 
29.                 return FALSE; 
30.             } 
31.         } 
32.         CallNextHookEx = (_CallNextHookEx)GetProcAddress(g_hHookApiDLL,
33.  _T("CallNextHookEx")); 
34.         if(CallNextHookEx == NULL) 
35.         { 
36.             return FALSE; 
37.         } 
38.         UnhookWindowsHookEx = (_UnhookWindowsHookEx)GetProcAddress(g_hHookApiDLL,
39.  _T("UnhookWindowsHookEx")); 
40.         if(UnhookWindowsHookEx == NULL) 
41.         { 
42.             return FALSE; 
43.         } 
44.     } 
45.     return TRUE; 
46. } 
47.  
48. BOOL DeactivateKBHook() 
49. { 
50.     //unload the hook 
51.     if(g_hInstalledLLKBDhook != NULL) 
52.     { 
53.         UnhookWindowsHookEx(g_hInstalledLLKBDhook); 
54.         g_hInstalledLLKBDhook = NULL; 
55.     } 
56.     //unload the coredll.dll 
57.     if(g_hHookApiDLL != NULL) 
58.     { 
59.         FreeLibrary(g_hHookApiDLL); 
60.         g_hHookApiDLL = NULL; 
61.     } 
62.     //we have terminated gracefully 
63.     return TRUE; 
64. } 

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

1. int CLoginDlg::BlockKeyList[] = {VK_TBACK,VK_TTALK,VK_TEND,VK_THOME}; 
2. LRESULT CALLBACK CLoginDlg::LLKeyboardHookCallbackFunction(int nCode,
3.  WPARAM wParam, LPARAM lParam) 
4. { 
5.     if(nCode >= HC_ACTION) 
6.     { 
7.         if(wParam == WM_KEYDOWN || wParam == WM_KEYUP
8.  || wParam == WM_LBUTTONDOWN) 
9.         {
10.             int countKeyList = ARRAY_SIZEOF(BlockKeyList);
11.             for(int i=0;i<countKeyList;i++) 
12.             {
13.                 if((((KBDLLHOOKSTRUCT*)lParam)->vkCode) == BlockKeyList[i])
14.                 {
15.                     return TRUE; 
16.                 } 
17.             } 
18.         } 
19.     } 
20.     return CallNextHookEx(g_hInstalledLLKBDhook, nCode, wParam, lParam); 
21. } 

   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。