Method ComputeInternalFileName

IO/Image/vtkImageReader2.cxx:97–152

------------------------------------------------------------------------------ This function sets the name of the file.

//------------------------------------------------------------------------------
// This function sets the name of the file.
void vtkImageReader2::ComputeInternalFileName(int slice)
{
  // delete any old filename
  delete[] this->InternalFileName;
  this->InternalFileName = nullptr;

  if (!this->FileName && !this->FilePattern && !this->FileNames)
  {
    vtkErrorMacro(<< "Either a FileName, FileNames, or FilePattern"
                  << " must be specified.");
    return;
  }

  // make sure we figure out a filename to open
  if (this->FileNames)
  {
    auto filename = this->FileNames->GetValue(slice);
    size_t size = filename.size() + 10;
    this->InternalFileName = new char[size];
    auto result = vtk::format_to_n(this->InternalFileName, size, "{:s}", filename);
    *result.out = '\0';
  }
  else if (this->FileName)
  {
    size_t size = strlen(this->FileName) + 10;
    this->InternalFileName = new char[size];
    auto result = vtk::format_to_n(this->InternalFileName, size, "{:s}", this->FileName);
    *result.out = '\0';
  }
  else
  {
    int slicenum = slice * this->FileNameSliceSpacing + this->FileNameSliceOffset;
    std::string filePattern = this->FilePattern ? vtk::to_std_format(this->FilePattern) : "";
    if (this->FilePrefix && !filePattern.empty())
    {
      size_t size = strlen(this->FilePrefix) + filePattern.size() + 10;
      this->InternalFileName = new char[size];
      VTK_FORMAT_IF_ERROR_RETURN(auto result = vtk::format_to_n(this->InternalFileName, size,
                                   filePattern, this->FilePrefix, slicenum);
                                 *result.out = '\0', );
    }
    else if (!filePattern.empty())
    {
      size_t size = filePattern.size() + 10;
      this->InternalFileName = new char[size];
      VTK_FORMAT_IF_ERROR_RETURN(
        auto result = vtk::format_to_n(this->InternalFileName, size, filePattern, "", slicenum);
        *result.out = '\0', );
    }
    else
    {
      delete[] this->InternalFileName;
      this->InternalFileName = nullptr;
    }
  }
}

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