VTK/Examples/Cxx/Utilities/UnknownLengthArray

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The only difference between this example and the KnownLengthArray example is that SetNumberOfValues() is not called, and SetValue() is replaced by InsertNextValue().

UnknownLengthArray.cxx

#include <vtkSmartPointer.h>
#include <vtkFloatArray.h>

int main(int, char *[])
{
  vtkSmartPointer<vtkFloatArray> distances =
    vtkSmartPointer<vtkFloatArray>::New();
  distances->SetName("Distances");
  distances->SetNumberOfComponents(1);

  //set values
  for(vtkIdType i = 0; i < 5; i++)
    {
    float f = (float)i + 0.1;
    //this will allocate memory as necessary
    distances->InsertNextValue(f);
    }

  //get values
  for(vtkIdType i = 0; i < distances->GetNumberOfTuples(); i++)
    {
    float f = distances->GetValue(i);
    std::cout << f << std::endl;
    }

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.6)

PROJECT(Array)

FIND_PACKAGE(VTK REQUIRED)
INCLUDE(${VTK_USE_FILE})

ADD_EXECUTABLE(UnknownLengthArray UnknownLengthArray.cxx)
TARGET_LINK_LIBRARIES(UnknownLengthArray vtkHybrid)