VTK/Examples/DetermineArrayDataTypes

#include <vtkPolyData.h>
#include <vtkPointData.h>
#include <vtkXMLPolyDataReader.h>
#include <vtkstd/vector>
 
void FindAllData(const vtkstd::string &inputFilename);
 
int main(int argc, char *argv[])
{
  if(argc != 2)
    {
    vtkstd::cout << "Required argument: InputFilename\n";
    exit(-1);
    }
 
  vtkstd::string inputFilename = argv[1];
  FindAllData(inputFilename);
 
  return 0;
}
 
void FindAllData(const vtkstd::string &InputFilename)
{
  vtkSmartPointer<vtkXMLPolyDataReader> reader = vtkSmartPointer<vtkXMLPolyDataReader>::New();
  reader->SetFileName(InputFilename.c_str());
  reader->Update();
  vtkPolyData* polydata = reader->GetOutput();
 
  unsigned int numberOfArrays = polydata->GetPointData()->GetNumberOfArrays();
  vtkstd::cout << "NumArrays: " << numberOfArrays << "\n";
 
  vtkstd::cout << "key: \n";
  //more values can be found in <VTK_DIR>/Common/vtkSetGet.h
  vtkstd::cout << VTK_UNSIGNED_CHAR << " unsigned char\n";
  vtkstd::cout << VTK_UNSIGNED_INT << " unsigned int\n";
  vtkstd::cout << VTK_FLOAT << " float\n";
  vtkstd::cout << VTK_DOUBLE << " double\n";
 
  vtkstd::vector<vtkstd::string> arrayNames;
  for(unsigned int i = 0; i < numberOfArrays; i++)
    {
    //the following two lines are equivalent
    //arrayNames.push_back(polydata->GetPointData()->GetArray(i)->GetName());
    arrayNames.push_back(polydata->GetPointData()->GetArrayName(i));
    int dataTypeID = polydata->GetPointData()->GetArray(i)->GetDataType();
    vtkstd::cout << "Array " << i << ": " << arrayNames[i] << " (type: " << dataTypeID << ")\n";
    }
 
}