C / C++ / MFC

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I don't know using hardware device for project.

1. to inform the worker thread that it must do something (to change the folder in your case). CreateEvent/SetEvent - in the main thread.
2. Because there is already one object: hFileChange. However the thread should react also to the second object created/set by CreateEvent/SetEvent in the main thread.

// TestFileView.h : interface of the CTestFileView class

protected:
	CEvent m_event;
	CString m_sFolder;
	CWinThread* m_pWinThread;

/*static*/UINT CTestFileView::FilesWatchDogThread(LPVOID lpParam)
{
	CTestFileView* pView = (CTestFileView*)lpParam;

	if (NULL == pView->GetSafeHwnd())
		return 1;

	HANDLE hChange = FindFirstChangeNotification(pView->GetFolder(), FALSE,	FILE_NOTIFY_CHANGE_FILE_NAME);

	if (INVALID_HANDLE_VALUE == hChange)
		return 1;

	HANDLE aHandles[2];
	aHandles[0] = hChange;
	aHandles[1] = pView->m_event.m_hObject;

	BOOL bContinue = TRUE;
	while (bContinue)
	{
		DWORD dwResult = WaitForMultipleObjects(2, aHandles, FALSE, INFINITE);
		switch (dwResult)
		{
		case WAIT_OBJECT_0:
			::PostMessage(pView->GetSafeHwnd(), WMU_NOTIFY_FOLDERCHANGED, 0, (LPARAM)0);
			FindNextChangeNotification(hChange);
			break;
		case WAIT_OBJECT_0 + 1:
			bContinue = FALSE;
			break;
		}
	}

	FindCloseChangeNotification(hChange);

	return 0;
}

void CTestFileView::StopThread()
{
	m_event.SetEvent();
	WaitForSingleObject(&m_event, INFINITE);
}

void CTestFileView::OnEditStartthread()
{
	// TODO: Add your command handler code here

	m_event.ResetEvent();
	m_sFolder.Format(_T("D:\\Tempx\\"));
	m_pWinThread = AfxBeginThread(&CTestFileView::FilesWatchDogThread, (LPVOID)this, THREAD_PRIORITY_NORMAL, CREATE_SUSPENDED, 0, NULL);
}

case WAIT_OBJECT_0 + 2:
     FindCloseChangeNotification(hChange);
     hChange = FindFirstChangeNotification(pView->GetFolder(), FALSE,    FILE_NOTIFY_CHANGE_FILE_NAME);
     aHandles[1] = pView->m_event.m_hObject;

aHandles[0] = hChange;

aHandles[1] = pView->m_event.m_hObject;