🚀 go-pugleaf

Gambit You have been very thankfull. It works finally.
But thanks for you, i now understand better some aspects of Windows API.
Thank you very much. Much obliged
"Remy Lebeau (TeamB)" <gambit47.no.spam@no.spam.yahoo.com> wrote in message
news:409a7fd0$1@newsgroups.borland.com...
>
> "Alex Sarafian" <demelene_gr@yahoo.gr> wrote in message
> news:409a0030$1@newsgroups.borland.com...
>
> > Since the handle of the parent window is passed in every dll instance,
>
> No, it is not.  It is only set for the instance of the DLL that is loaded
> into the application that is actually calling setHook().  Which means only
> the instances attached to your own application will have a valid HWND
handle
> available.  No other DLL instance will have their HWND handle set, unless
> you put the HWND into shared memory like I explained to you earlier.
>
> > I read about CreateFileMapping and MapViewOfFile but I'm
> > having some trouble, so if you can help?
> > Where is the file mapping must be created??
>
> Create and destroy it in your DLLEntryPoint() function, so that the memory
> is always available as soon as the DLL is loaded.
>
>     typedef struct
>     {
>         HWND hWnd;
>         HHOOK hHook;
>     }  TMyHookInfo, *PMyHookInfo;
>
>     HANDLE hMapping = NULL;
>     PMyHookInfo pHookInfo = NULL;
>
>     HINSTANCE hInst = NULL;
>     UINT UWM_MOUSEMOVE = 0;
>
>     bool CreateSharedHookInfo()
>     {
>         hMapping = CreateFileMapping(INVALID_HANDLE_VALUE, NULL,
> PAGE_READWRITE, 0, sizeof(TMyHookInfo), "MySharedHookInfo");
>         if( hMapping == NULL )
>             return false;
>
>         bool bIsNewMapping = (GetLastError() != ERROR_ALREADY_EXISTS);
>
>         pHookInfo = (PMyHookInfo) MapViewOfFile(hMapping, FILE_MAP_WRITE,
0,
> 0, 0);
>         if( pHookInfo == NULL )
>         {
>             CloseHandle(hMapping);
>             hMapping = NULL;
>             return false;
>         }
>
>         if( bIsNewMapping )
>         {
>             pHookInfo->hWnd = NULL;
>             pHookInfo->hHook = NULL;
>         }
>
>         return true;
>     }
>
>                 }
>                 return FALSE;
>
>     #pragma argsused
>     int WINAPI DllEntryPoint(HINSTANCE hinst, unsigned long reason, void*
> lpReserved)
>     {
>         switch( reason )
>         {
>             case DLL_PROCESS_ATTACH:
>                 hInst = hinst;
>
>                 UWM_MOUSEMOVE = RegisterWindowMessage(UWM_MOUSEMOVE_MSG);
>                 if( UWM_MOUSEMOVE == 0 )
>                     return FALSE;
>
>                 if( !CreateSharedHookInfo() )
>                     return FALSE;
>
>                 break;
>
>             case DLL_PROCESS_DETACH:
>                 if( pHookInfo != NULL ) UnmapViewOfFile(pHookInfo);
>                 if( hMapping != NULL ) CloseHandle(hMapping);
>                 break;
>         }
>
>         return TRUE;
>     }
>
>     extern "C" __EXPORT_TYPE BOOL __stdcall setMyHook(HWND hWnd)
>     {
>         if( (pHookInfo) && (pHookInfo->hHook == NULL) )
>         {
>             pHookInfo->hHook = SetWindowsHookEx(WH_MOUSE,
> (HOOKPROC)MessageHook, hInst, 0);
>             if( pHookInfo->hHook != NULL )
>             {
>                 pHookInfo->hWnd = hWnd;
>                 return TRUE;
>             }
>         }
>         return FALSE;
>     }
>
>     extern "C" __EXPORT_TYPE BOOL __stdcall clearMyHook(HWND hWnd)
>     {
>         if( (pHookInfo) && ((pHookInfo->hWnd == hWnd) || (hWnd == NULL)) )
>         {
>             if( UnhookWindowsHookEx(pHookInfo->hHook) )
>             {
>                 pInfo->hWnd = NULL;
>                 pInfo->hHook = NULL;
>                 return TRUE;
>             }
>         }
>         return FALSE;
>     }
>
>     extern "C" LRESULT CALLBACK MessageHook(int nCode, WPARAM wParam,
LPARAM
> lParam)
>     {
>         if( pHookInfo )
>         {
>             if( nCode >= 0 )
>                 PostMessage(pHookInfo->hWnd, UWM_MOUSEMOVE, 0, 0);
>
>             return CallNextHookEx(pHookInfo->hHook, nCode, wParam,
lParam);
>         }
>         return 0;
>     }
>
>
> Gambit
>
>