vtkSmartPointer<vtkExodusIIReader> reader = vtkSmartPointer<vtkExodusIIReader>::New();
reader->SetFileName(filePath.toStdString().c_str());
reader->Update();
int cnt = reader->GetNumberOfTimeSteps();
vtkSmartPointer<vtkExodusIIReader> reader = vtkSmartPointer<vtkExodusIIReader>::New();
reader->SetFileName(filePath.toStdString().c_str());
reader->Update();
int cnt = reader->GetNumberOfTimeSteps();