Method OpenVTKFile

IO/Legacy/vtkDataReader.cxx:459–530

------------------------------------------------------------------------------ Open a vtk data file. Returns zero if error.

//------------------------------------------------------------------------------
// Open a vtk data file. Returns zero if error.
int vtkDataReader::OpenVTKFile(const char* fname)
{
  if (!fname && this->GetNumberOfFileNames() > 0)
  {
    fname = this->GetFileName(0);
  }
  this->CurrentFileName = fname ? fname : std::string();

  if (this->IS != nullptr)
  {
    this->CloseVTKFile();
  }
  if (this->ReadFromInputString)
  {
    if (this->InputArray)
    {
      vtkDebugMacro(<< "Reading from InputArray");
      std::string str(this->InputArray->GetPointer(0),
        static_cast<size_t>(
          this->InputArray->GetNumberOfTuples() * this->InputArray->GetNumberOfComponents()));
      this->IS = new std::istringstream(str);
      return 1;
    }
    else if (this->InputString)
    {
      vtkDebugMacro(<< "Reading from InputString");
      std::string str(this->InputString, this->InputStringLength);
      this->IS = new std::istringstream(str);
      return 1;
    }
  }
  else
  {
    vtkDebugMacro(<< "Opening vtk file");

    if (!fname || (strlen(fname) == 0))
    {
      vtkErrorMacro(<< "No file specified!");
      this->SetErrorCode(vtkErrorCode::NoFileNameError);
      return 0;
    }

    // first make sure the file exists, this prevents an empty file from
    // being created on older compilers
    vtksys::SystemTools::Stat_t fs;
    if (vtksys::SystemTools::Stat(fname, &fs) != 0)
    {
      vtkErrorMacro(<< "Unable to open file: " << fname);
      this->SetErrorCode(vtkErrorCode::CannotOpenFileError);
      return 0;
    }

    this->IS = new vtksys::ifstream(fname, ios::in | ios::binary);
    if (this->IS->fail())
    {
      vtkErrorMacro(<< "Unable to open file: " << fname);
      delete this->IS;
      this->IS = nullptr;