# DumpXMLFile

VTKExamples/Cxx/IO/DumpXMLFile

### Description

This example reports the cell, cell data and point data contained within a VTK XML or legacy file.

### Code

DumpXMLFile.cxx

    //
    // DumpXMLFile - report on the contents of an XML or legacy vtk file
    //  Usage: DumpXMLFile XMLFile1 XMLFile2 ...
    //         where
    //         XMLFile is a vtk XML file of type .vtu, .vtp, .vts, .vtr,
    //         .vti, .vto
    //
    #include <vtkSmartPointer.h>
    #include <vtkXMLReader.h>
    #include <vtkXMLUnstructuredGridReader.h>
    #include <vtkXMLPolyDataReader.h>
    #include <vtkXMLStructuredGridReader.h>
    #include <vtkXMLRectilinearGridReader.h>
    #include <vtkXMLHyperOctreeReader.h>
    #include <vtkXMLCompositeDataReader.h>
    #include <vtkXMLStructuredGridReader.h>
    #include <vtkXMLImageDataReader.h>
    #include <vtkDataSetReader.h>
    #include <vtkDataSet.h>
    #include <vtkUnstructuredGrid.h>
    #include <vtkRectilinearGrid.h>
    #include <vtkHyperOctree.h>
    #include <vtkImageData.h>
    #include <vtkPolyData.h>
    #include <vtkStructuredGrid.h>
    #include <vtkPointData.h>
    #include <vtkCellData.h>
    #include <vtkFieldData.h>
    #include <vtkCellTypes.h>
    #include <vtksys/SystemTools.hxx>

    #include <map>

    template<class TReader> vtkDataSet *ReadAnXMLFile(const char*fileName)
    {
      vtkSmartPointer<TReader> reader =
        vtkSmartPointer<TReader>::New();
      reader->SetFileName(fileName);
      reader->Update();
      reader->GetOutput()->Register(reader);
      return vtkDataSet::SafeDownCast(reader->GetOutput());
    }

    int main (int argc, char *argv[])
    {
      if (argc < 2)
      {
        std::cerr << "Usage: " << argv[0] << " XMLFile1 XMLFile2 ..." << std::endl;
        return EXIT_FAILURE;
      }

      // Process each file on the command line
      int f = 1;
      while (f < argc)
      {
        vtkDataSet *dataSet;
        std::string extension =
          vtksys::SystemTools::GetFilenameLastExtension(argv[f]);
        // Dispatch based on the file extension
        if (extension == ".vtu")
        {
          dataSet = ReadAnXMLFile<vtkXMLUnstructuredGridReader> (argv[f]);
        }
        else if (extension == ".vtp")
        {
          dataSet = ReadAnXMLFile<vtkXMLPolyDataReader> (argv[f]);
        }
        else if (extension == ".vts")
        {
          dataSet = ReadAnXMLFile<vtkXMLStructuredGridReader> (argv[f]);
        }
        else if (extension == ".vtr")
        {
          dataSet = ReadAnXMLFile<vtkXMLRectilinearGridReader> (argv[f]);
        }
        else if (extension == ".vti")
        {
          dataSet = ReadAnXMLFile<vtkXMLImageDataReader> (argv[f]);
        }
        else if (extension == ".vto")
        {
          dataSet = ReadAnXMLFile<vtkXMLHyperOctreeReader> (argv[f]);
        }
        else if (extension == ".vtk")
        {
          dataSet = ReadAnXMLFile<vtkDataSetReader> (argv[f]);
        }
        else
        {
          std::cerr << argv[0] << " Unknown extension: " << extension << std::endl;
          return EXIT_FAILURE;
        }

        int numberOfCells = dataSet->GetNumberOfCells();
        int numberOfPoints = dataSet->GetNumberOfPoints();

        // Generate a report
        std::cout << "------------------------" << std::endl;
        std::cout << argv[f] << std::endl
             << " contains a " << std::endl
             << dataSet->GetClassName()
             <<  " that has " << numberOfCells << " cells"
             << " and " << numberOfPoints << " points." << std::endl;
        typedef std::map<int,int> CellContainer;
        CellContainer cellMap;
        for (int i = 0; i < numberOfCells; i++)
        {
          cellMap[dataSet->GetCellType(i)]++;
        }

        CellContainer::const_iterator it = cellMap.begin();
        while (it != cellMap.end())
        {
          std::cout << "\tCell type "
               << vtkCellTypes::GetClassNameFromTypeId(it->first)
               << " occurs " << it->second << " times." << std::endl;
          ++it;
        }

        // Now check for point data
        vtkPointData *pd = dataSet->GetPointData();
        if (pd)
        {
          std::cout << " contains point data with "
               << pd->GetNumberOfArrays()
               << " arrays." << std::endl;
          for (int i = 0; i < pd->GetNumberOfArrays(); i++)
          {
            std::cout << "\tArray " << i
                 << " is named "
                 << (pd->GetArrayName(i) ? pd->GetArrayName(i) : "NULL")
                 << std::endl;
          }
        }
        // Now check for cell data
        vtkCellData *cd = dataSet->GetCellData();
        if (cd)
        {
          std::cout << " contains cell data with "
               << cd->GetNumberOfArrays()
               << " arrays." << std::endl;
          for (int i = 0; i < cd->GetNumberOfArrays(); i++)
          {
            std::cout << "\tArray " << i
                 << " is named "
                 << (cd->GetArrayName(i) ? cd->GetArrayName(i) : "NULL")
                 << std::endl;
          }
        }
        // Now check for field data
        if (dataSet->GetFieldData())
        {
          std::cout << " contains field data with "
               << dataSet->GetFieldData()->GetNumberOfArrays()
               << " arrays." << std::endl;
          for (int i = 0; i < dataSet->GetFieldData()->GetNumberOfArrays(); i++)
          {
            std::cout << "\tArray " << i
                 << " is named " << dataSet->GetFieldData()->GetArray(i)->GetName()
                 << std::endl;
          }
        }
        dataSet->Delete();
        f++;
      }
      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(DumpXMLFile)

    find_package(VTK REQUIRED)
    include(${VTK_USE_FILE})

    add_executable(DumpXMLFile MACOSX_BUNDLE DumpXMLFile.cxx)

    target_link_libraries(DumpXMLFile ${VTK_LIBRARIES})

### Download and Build DumpXMLFile

Click here to download DumpXMLFile and its CMakeLists.txt file. Once the tarball DumpXMLFile.tar has been downloaded and extracted,

    cd DumpXMLFile/build

If VTK is installed:

    cmake ..

If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

    cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

Build the project:

    make

and run it:

    ./DumpXMLFile

WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.