SetWindowsHookEx(...)

Hi,

How can I monitor all the message (MOUSE and KEYBOARD) of the Windows even though my application is not active?

ie. the user is using another application at that moment but my application is still running.

I have tried this but I can only catch the msg while my application is active.

I am using Visual C++ 5.0 Prof. Edition to test this:

at the exe file:

1.) Link the library file at the Project->Setting->Link

2.) declare the following lines at cpp file
__declspec( dllimport ) LRESULT CALLBACK KeyboardProc(int nCode, WPARAM wParam, LPARAM lParam);
__declspec( dllimport ) BOOL Hook();
__declspec( dllimport ) BOOL UnSetHook();

3.) At the OnInitDialog Function(),

     HINSTANCE hinstDLL;
     DWORD errorNumber;

     hinstDLL = LoadLibrary((LPCTSTR)"HookDll.dll");
     if ( hinstDLL == NULL )
     {
       errorNumber = GetLastError();
     }

     Hook();

4.) At the OnDestroy Function

     UnSetHook();

-----------------------------------------------------------------

At the Dll's cpp file:

#pragma comment(linker, "-section:hookdata,rws")
#pragma data_seg("hookdata")
HHOOK g_hHook = NULL; // Global hook handle
#pragma data_seg()

HINSTANCE g_hinstDll = NULL;

__declspec(dllexport) LRESULT CALLBACK KeyboardProc(int code, WPARAM wParam, LPARAM lParam)
{
      if (code == HC_ACTION)
      TRACE("CATCH HC_ACTION MESSAGE\n");
     
     else if (code == HC_NOREMOVE)
      TRACE("CATCH HC_REMOVE MESSAGE\n");

      // Pass through the hook chain
        return CallNextHookEx(g_hHook, code, wParam, lParam);
}

__declspec(dllexport) BOOL Hook()
{
     if (g_hHook != NULL)
      return FALSE;

    g_hHook = SetWindowsHookEx(WH_KEYBOARD, KeyboardProc, g_hinstDll, 0);

   return (g_hHook != NULL);
}

__declspec(dllexport) BOOL UnSetHook()
{
     BOOL rc;
     rc = UnhookWindowsHookEx(g_hHook);
     if (rc)
         g_hHook = NULL;

     return rc;
}

extern "C" int APIENTRY
DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
{
     switch(dwReason)
      {
      case DLL_PROCESS_ATTACH:
                                              DisableThreadLibraryCalls(hInstance);
                     g_hinstDll = hInstance;  // Save DLL instance handle
                     break;

      }

     return TRUE;  

}

-------------------------------------------------------

Any mistake I have made?

Until now, I can only catch the msg when I press the keyboard button and my application is being active at the same time.

Thanks for your help!!!