Method InitializeWithArgs

Utilities/PythonInterpreter/vtkPythonInterpreter.cxx:430–583

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//------------------------------------------------------------------------------
bool vtkPythonInterpreter::InitializeWithArgs(
  int initsigs, int argc, char* argv[], const char* programName)
{
  bool isolated = vtkPythonPreConfig();

  if (Py_IsInitialized() == 0)
  {
    if (programName)
    {
      vtkPythonInterpreter::SetProgramName(programName);
    }
    else
    {
      // If no program name is specified,
      // guide the mechanism to locate Python standard library, if possible.
      SetupPythonPrefix(isolated);
    }
    bool signals_installed = initsigs != 0;

    // Need two copies of args, because programs might modify the first
    using OwnedWideString = std::unique_ptr<wchar_t, CharDeleter>;
    std::vector<wchar_t*> argvForPython;
    std::vector<OwnedWideString> argvCleanup;
    for (int i = 0; i < argc; i++)
    {
      OwnedWideString argCopy(vtk_Py_UTF8ToWide(argv[i]), CharDeleter());
      if (argCopy == nullptr)
      {
        vtk::print(stderr,
          "Fatal vtkpython error: "
          "unable to decode the command line argument #{:d}\n",
          i + 1);
        return false;
      }

      argvForPython.push_back(argCopy.get());
      argvCleanup.emplace_back(std::move(argCopy));
    }
    argvForPython.push_back(nullptr);

#if PY_VERSION_HEX < 0x03080000
    Py_InitializeEx(initsigs);
    // setup default argv. Without this, code snippets that check `sys.argv` may
    // fail when run in embedded VTK Python environment.
    PySys_SetArgvEx(argc, argvForPython.data(), 0);

    isolated = Py_FrozenFlag;
#else
    PyConfig config;
    PyStatus status;
    PyConfig_InitPythonConfig(&config);
    config.install_signal_handlers = initsigs;
    config.program_name = PythonProgramName.pop_last();
    status = PyConfig_SetArgv(&config, argc, argvForPython.data());
    if (PyStatus_IsError(status))
    {
      PyConfig_Clear(&config);
      return false;