Windows Mobile Message hook (1)

Many people have done keyboard hook setting in windows, but there is no direct Function Support in Windows Mobile System. However, we can use the undocument API.

1. Define parameters

 
 

  
  
#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;   
 
 

II. Implementation Code

Llkeyboardhookcallbackfunction is the callback function.

 
 

  
  
Bool activatekbhook (hinstance,
  
  
Hookproc llkeyboardhookcallbackfunction)
  
  
{
  
  
// We need to manually load these standard Win32 API CILS
  
  
// Msdn states that these aren'' t supported in WinCE
  
  
Setwindowshookex = NULL;
  
  
Callnexthookex = NULL;
  
  
Unhookwindowshookex = NULL;
  
  
// Obtain the required function from coredll. dll.
  
  
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;
  
  
}
 
 

Iii. Message callback function

This is the general callback function, and blockkeylist is the list of buttons to be blocked.

 
 

  
  
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); 
  
  
} 
 
 

Global keyboard hooks can be implemented without using DLL in Windows Mobile)

If you only want to block all the buttons, you can simply use the enablehardwarekeyboard function.