[vtkusers] vtkZLibCompressor problem

[Dominik Szczerba]

Hello,

I have been failing to get the vtkZLibCompressor working in VTK 4.4.
Unfortunately, I couldnt google out any examples for C++. Here is my code:

  //convert legacy format to XML
  vtkStructuredGridReader* reader = vtkStructuredGridReader::New();
  reader->SetFileName(argv[1]);
  vtkStructuredGrid* grid = reader->GetOutput();
  grid->Update();

  vtkZLibDataCompressor* myZlibCompressor  = vtkZLibDataCompressor::New();
  myZlibCompressor->SetCompressionLevel(9);

  vtkXMLStructuredGridWriter* writer = vtkXMLStructuredGridWriter::New();
  writer->SetInput(grid);
  writer->SetFileName(argv[2]);
  //writer->SetDataModeToBinary();
  writer->SetCompressor(myZlibCompressor);
  writer->Write();


Now I see absolutely no compressing effect on my output file. On
contrary, gzip file.vtk reduces the file size dramatically. What am I
doing wrong?

regards,
Dominik

-- 
Dominik Szczerba, Dr.
ETZ C110 CO-ME/BIWI CH-8092 Zurich
http://www.vision.ee.ethz.ch/~domi