Method ExecuteInformation

IO/Image/vtkDICOMImageReader.cxx:102–227

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//------------------------------------------------------------------------------
void vtkDICOMImageReader::ExecuteInformation()
{
  if (!this->GetStream() && this->FileName == nullptr && this->DirectoryName == nullptr)
  {
    return;
  }

  const auto parseInformation = [this]()
  {
    this->DICOMFileNames->clear();
    this->AppHelper->Clear();
    this->AppHelper->RegisterCallbacks(this->Parser);
    this->Parser->ReadHeader();
    this->SetupOutputInformation(1);
  };

  if (this->GetStream())
  {
    this->Parser->ClearAllDICOMTagCallbacks();
    this->Streambuf = this->GetStream()->ToStreambuf();
    std::istream* iStream = new std::istream(this->Streambuf.get());
    this->Parser->OpenStream(iStream);
    parseInformation();
  }
  if (this->FileName)
  {
    vtksys::SystemTools::Stat_t fs;
    if (vtksys::SystemTools::Stat(this->FileName, &fs))
    {
      vtkErrorMacro("Unable to open file " << this->FileName);
      return;
    }
    this->Parser->ClearAllDICOMTagCallbacks();
    this->Parser->OpenFile(this->FileName);
    parseInformation();
  }
  else if (this->DirectoryName)
  {
    vtkDirectory* dir = vtkDirectory::New();
    int opened = dir->Open(this->DirectoryName);
    if (!opened)
    {
      vtkErrorMacro("Couldn't open " << this->DirectoryName);
      dir->Delete();
      return;
    }
    vtkIdType numFiles = dir->GetNumberOfFiles();

    vtkDebugMacro(<< "There are " << numFiles << " files in the directory.");

    this->DICOMFileNames->clear();
    this->AppHelper->Clear();

    for (vtkIdType i = 0; i < numFiles; i++)
    {
      if (strcmp(dir->GetFile(i), ".") == 0 || strcmp(dir->GetFile(i), "..") == 0)
      {
        continue;