Method RequestData

IO/Infovis/vtkFixedWidthTextReader.cxx:75–197

//------------------------------------------------------------------------------

int vtkFixedWidthTextReader::RequestData(
  vtkInformation*, vtkInformationVector**, vtkInformationVector* outputVector)
{
  int numLines = 0;

  // Check that the filename has been specified
  if (!this->FileName)
  {
    vtkErrorMacro("vtkFixedWidthTextReader: You must specify a filename!");
    return 2;
  }

  vtksys::ifstream infile(this->FileName, ios::in);
  if (!infile || infile.fail())
  {
    vtkErrorMacro(<< "vtkFixedWidthTextReader: Couldn't open file!");
    return 2;
  }

  // The first line of the file might contain the headers, so we want
  // to be a little bit careful about it.  If we don't have headers
  // we'll have to make something up.
  std::vector<std::string> headers;
  std::vector<std::string> firstLineFields;
  std::string firstLine;

  my_getline(infile, firstLine);

  //  vtkDebugMacro(<<"First line of file: " << firstLine);

  if (this->HaveHeaders)
  {
    splitString(firstLine, this->FieldWidth, this->StripWhiteSpace, headers);
  }
  else
  {
    splitString(firstLine, this->FieldWidth, this->StripWhiteSpace, firstLineFields);

    for (unsigned int i = 0; i < firstLineFields.size(); ++i)
    {
      char fieldName[64];
      auto result = vtk::format_to_n(fieldName, sizeof(fieldName), "Field {:d}", i);
      *result.out = '\0';
      headers.emplace_back(fieldName);
    }
  }

  vtkTable* table = vtkTable::GetData(outputVector);
  if (this->TableErrorObserver)
  {
    table->AddObserver(vtkCommand::ErrorEvent, this->TableErrorObserver);
  }

  // Now we can create the arrays that will hold the data for each
  // field.
  std::vector<std::string>::const_iterator fieldIter;
  for (fieldIter = headers.begin(); fieldIter != headers.end(); ++fieldIter)
  {