Re: Windows Hook on Win9x system
- From: "Star Fleet Admiral Q" <Star_Fleet_Admiral_Q(NO-SPAM)@(SPAM-NOT)hotmail.com>
- Date: Mon, 4 Jul 2005 20:59:45 -0400
Win9x doesn't support UNICODE (TCHAR).
--
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"dc2000" <dc2000@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:987C6FFD-F443-46F1-B324-E3B8B61635E8@xxxxxxxxxxxxxxxx
> Hi everyone:
>
>
> I've reached a complete deadend trying to install a Windows hook on a
> Win9x
> system (Windows 95/98/Me). The following code works fine on any of the
> WinNT
> systems (Windows NT/2000/XP) but it does mysteriously nothing on neither
> of
> my Windows 95 or 98. Any help will be GREATLY appreciated!
>
> Here's what this code is doing. It resides in a DLL, fnRunHook9x(...) is
> exported and called from the main app with two handles: one is a window
> handle to the main program and second is a window handle to collect info
> on
> (very much like PasswordSpy). fnRunHook9x once being loaded into a process
> space of the control (whose window handle it had received) retrieves it's
> module and image path, start-up parameters and returns it back to the main
> app. This functionality will be very useful on Win9x system as there are
> no
> APIs to retrieve module and image path, also start-up parameters by window
> handle if that window belongs to another process.
>
> OK, now the code (I made it here as short as possible):
>
>
> typedef struct _MY_SEND_DATA{ //Data is collected in a call to
> CollectData(...) from a hook proc
> TCHAR cmdLine[MAX_PATH];
> TCHAR modPath[MAX_PATH];
> TCHAR imgPath[MAX_PATH];
> }MY_SEND_DATA, *LPMY_SEND_DATA;
>
> typedef struct _MY_DATA{
> BOOL bRes; //Set to TRUE if hook processed data
> HOOK hHook; //Hook handle
> HWND hTgdWnd; //Handle of target window
> HWND hCtlWnd; //Main (control) window
> UINT uPrivMessage; //Private message we trigger hook proc with
> }MY_DATA, *LPMY_DATA;
>
> //Global variables (loaded for each instance of DLL)
> static MY_SEND_DATA MySendData = {0};
> static HINSTANCE hDLLInst = NULL;
> static HANDLE hFileMapping = NULL;
> static MY_DATA* pMySharedMem = NULL; //Pointer to shared memory segment
>
>
> BOOL APIENTRY DllMain(HANDLE hModule,
> DWORD ul_reason_for_call,
> LPVOID lpReserved)
> {
> switch (ul_reason_for_call)
> {
> case DLL_PROCESS_ATTACH:
> //Called once when this DLL is loaded and each time from
> SetWindowsHookEx(...)
> //in fnRunHook9x(...)
> hDLLInst = (HINSTANCE)hModule;
>
> //Open file mapping object
> pMySharedMem = NULL;
> hFileMapping = CreateFileMapping((HANDLE)INVALID_HANDLE_VALUE,
> NULL, PAGE_READWRITE, 0, sizeof(MY_DATA), _T("Name_My_File_Mapping_123"));
> if(hFileMapping)
> {
> //Map file into virtual memory
> pMySharedMem = (MY_MESSAGE_DATA1*)
> MapViewOfFile(hFileMapping, FILE_MAP_ALL_ACCESS, 0, 0, sizeof(MY_DATA));
> }
> break;
>
>
> case DLL_PROCESS_DETACH:
> //Uninitialization of DLL
> if(pMySharedMem)
> UnmapViewOfFile(pMySharedMem);
> if(hFileMapping)
> CloseHandle(hFileMapping);
> break;
> }
>
> return TRUE;
> }
>
> WINIDHOOK_API BOOL fnRunHook9x(HWND hWndCaller, HWND hWndTarget)
> {
> //EXPORTED -- called from the main (control) app
> //Installs and runs hook on Win9x system
> //(Sends data back in WM_COPYDATA message to hWndCaller window)
> //RETURN: - TRUE if success
>
> //Check if we have shared mem and it's accessible
> if(!pMySharedMem)
> return FALSE;
> if(IsBadReadPtr(pMySharedMem, sizeof(MY_DATA)) ||
> IsBadWritePtr(pMySharedMem, sizeof(MY_DATA)))
> return FALSE;
>
> //Get private message
> UINT uPrivateMsg = RegisterWindowMessage("My_Private_message_123");
>
> //Set up shared memory data
> pMySharedMem->bRes = FALSE;
> pMySharedMem->hTgdWnd = hWndTarget;
> pMySharedMem->hCtlWnd = hWndCaller;
> pMySharedMem->uPrivMessage = uPrivateMsg;
>
> //Set hook
> //(I'm using WH_CALLWNDPROCRET because of the way WH_CALLWNDPROC is called
> on Win9x:
> //See more details here:
> http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/hooks/hookreference/hookfunctions/callwndproc.asp)
> pMySharedMem->hHook = SetWindowsHookEx(WH_CALLWNDPROCRET, CallMyWndProc9x,
> hDLLInst,
> GetWindowThreadProcessId(hWndTarget, NULL));
>
> if(!pMySharedMem->hHook)
> return FALSE;
>
> //Trigger hook with a message
> DWORD nMesRes;
> SendMessageTimeout(hWndTarget, uPrivateMsg, 0, 0,
> SMTO_ABORTIFHUNG | SMTO_NORMAL, 100, &nMesRes);
>
> //Check results
> BOOL bResult = pMySharedMem->bRes ? TRUE : FALSE;
>
> //Remove hook
> bResult &= UnhookWindowsHookEx(pMySharedMem->hHook);
>
> return bResult;
> }
>
>
> LRESULT CALLBACK CallMyWndProc9x(int nCode, WPARAM wParam, LPARAM lParam)
> {
> //Hook callback procedure
> if(pMySharedMem)
> {
> //Only if we have pointer to shared memory
> CWPSTRUCT* pCwp = (CWPSTRUCT*)lParam;
> if(nCode == HC_ACTION)
> {
> if(pCwp)
> if(pCwp->message == pMySharedMem->uPrivMessage)
> {
> //Our hook -> Run data collecting routine
> CollectData(pMySharedMem);
> return 0;
> }
> }
>
> //Otherwise call next hook
> return CallNextHookEx(pMySharedMem->hHook, nCode, wParam, lParam);
> }
> else
> {
> //Lost shared memory
> ASSERT(NULL);
> return 0;
> }
> }
>
> void CollectData(MY_DATA* pSharedMem)
> {
> //Collect data and send it back to the main app
> if(pSharedMem)
> {
> //Check if data is accessible in Shared mem
> if(IsBadReadPtr(pSharedMem, sizeof(MY_DATA)) ||
> IsBadWritePtr(&pSharedMem->bRes, sizeof(pSharedMem->bRes)))
> return;
>
> HWND hTrgWnd = pSharedMem->hTgdWnd;
> HWND hClrWnd = pSharedMem->hCtlWnd;
>
> //Get command line params
> LPTSTR pCmdLine = GetCommandLine();
> lstrcpyn(MySendData.cmdLine, pCmdLine ? pCmdLine : _T(""), MAX_PATH);
>
> //Get module path
> GetModuleFileName((HMODULE)GetClassLongPtr(hTrgWnd, GCLP_HMODULE),
> MySendData.modPath, MAX_PATH);
>
> //Get image path
> if(GetModuleFileName(NULL, MySendData.imgPath, MAX_PATH) == 0)
> MySendData.imgPath[0] = _T('\0');
>
> //Send data back
> COPYDATASTRUCT cds;
> cds.lpData = &MySendData;
> cds.dwData = 0x123; //ID of the message
> cds.cbData = sizeof(MySendData);
> ::SendMessage(hClrWnd, WM_COPYDATA, (WPARAM)hTrgWnd, (LPARAM)&cds);
>
> //Report success
> pSharedMem->bRes = TRUE;
> }
> }
>
.
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