DetermineArrayDataTypes
VTKExamples/Cxx/PolyData/DetermineArrayDataTypes
Description¶
This example shows how to determine the type of data stored in a named array in a vtp file.
Code¶
DetermineArrayDataTypes.cxx
#include <vtkSmartPointer.h> #include <vtkPolyData.h> #include <vtkPointData.h> #include <vtkXMLPolyDataReader.h> #include <vector> #include <string> void FindAllData(const std::string &inputFilename); int main(int argc, char *argv[]) { if(argc != 2) { std::cout << "Usage: " << argv[0] << " InputFilename" << std::endl; return EXIT_FAILURE; } std::string inputFilename = argv[1]; FindAllData(inputFilename); return EXIT_SUCCESS; } void FindAllData(const std::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(); std::cout << "NumArrays: " << numberOfArrays << std::endl; std::cout << "key: " << std::endl;; //more values can be found in <VTK_DIR>/Common/vtkSetGet.h std::cout << VTK_UNSIGNED_CHAR << " unsigned char" << std::endl; std::cout << VTK_UNSIGNED_INT << " unsigned int" << std::endl; std::cout << VTK_FLOAT << " float" << std::endl; std::cout << VTK_DOUBLE << " double" << std::endl; std::vector<std::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(); std::cout << "Array " << i << ": " << arrayNames[i] << " (type: " << dataTypeID << ")" << std::endl; } }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(DetermineArrayDataTypes) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(DetermineArrayDataTypes MACOSX_BUNDLE DetermineArrayDataTypes.cxx) target_link_libraries(DetermineArrayDataTypes ${VTK_LIBRARIES})
Download and Build DetermineArrayDataTypes¶
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Click here to download DetermineArrayDataTypes and its CMakeLists.txt file. Once the tarball DetermineArrayDataTypes.tar has been downloaded and extracted,
cd DetermineArrayDataTypes/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:
./DetermineArrayDataTypes
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.