In my application I execute the command given in a macro file by means of:

  G4UImanager* UImanager = G4UImanager::GetUIpointer();
  auto result UImanager->ApplyCommand(std::string("/control/execute ") + fileName);
  std::cout << "result: " << result << std::endl;

According to the comment in G4UImanager.hh, the return value should be positive non-zero when an error occurs. However, it is 0 when fileName is the name of a non-existing file:

  ERROR: Can not open a macro file <nonExistingFile.mac>. Set macro path with "/control/macroPath" if needed.
  result: 0

Similarly, when the macro contains a bad command the return value is again 0:

  ***** COMMAND NOT FOUND </nonExistingCommand> *****
  
  ***** Batch is interrupted!! *****
  result: 0


So how can I check whether the execution of the macro has been successful or not?