Finding a 3rd party QWidget with injected code & QWidget::find(hwnd)
- by David Menard
Hey,
I have a Qt Dll wich I inject into a third-party Application using windows detours library:
if(!DetourCreateProcessWithDll( Path, NULL, NULL, NULL, TRUE,
CREATE_DEFAULT_ERROR_MODE | CREATE_SUSPENDED, NULL, NULL,
&si, &pi, "C:\\Program Files\\Microsoft Research\\Detours Express 2.1\\bin\\detoured.dll",
"C:\\Users\\Dave\\Documents\\Visual Studio 2008\\Projects\\XOR\\Debug\\XOR.dll", NULL))
and then I set a system-wide hook to intercept window creation:
HHOOK h_hook = ::SetWindowsHookEx(WH_CBT, (HOOKPROC)CBTProc, Status::getInstance()->getXORInstance(), 0);
Where XOR is my programs name, and Status::getInstance() is a Singleton where I keep globals.
In my CBTProc callback, I want to intercept all windows that are QWidgets:
HWND hwnd= FindWindow(L"QWidget", NULL);
which works well, since I get a corresponding HWND (I checked with Spy++)
Then, I want to get a pointer to the QWidget, so I can use its functions:
QWidget* q = QWidget::find(hwnd);
but here's the problem, the returned pointer is always 0. Am I not injecting my code into the process properly? Or am I not using QWidget::find() as I should?
Thanks,
Dave
EDIT:If i change the QWidget::find() function to an exported function of my DLL, after setting the hooks (so I can set and catch a breakpoint), QWidgetPrivate::mapper is NULL.
