VTK/Examples/Developers/FailedFilter

#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
 
#include "vtkTestFilter.h"
 
int main (int argc, char *argv[])
{
  vtkSmartPointer<vtkSphereSource> sphereSource =
      vtkSmartPointer<vtkSphereSource>::New();
  sphereSource->Update();
 
  vtkSmartPointer<vtkTestFilter> filter =
      vtkSmartPointer<vtkTestFilter>::New();
  filter->SetInputConnection(sphereSource->GetOutputPort());
  filter->Update();
 
  if(filter->GetErrorCode() == 23)
    {
    std::cout << "Filter failed!" << std::endl;
    }
 
  return EXIT_SUCCESS;
}

// .NAME vtkTestFilter
// .SECTION Description
// vtkTestFilter
 
#ifndef __vtkTestFilter_h
#define __vtkTestFilter_h
 
#include "vtkPolyDataAlgorithm.h"
 
class vtkTestFilter : public vtkPolyDataAlgorithm
{
public:
  vtkTypeMacro(vtkTestFilter,vtkPolyDataAlgorithm);
  static vtkTestFilter *New();
 
protected:
  vtkTestFilter(){}
  ~vtkTestFilter(){}
 
  int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *);
 
private:
  vtkTestFilter(const vtkTestFilter&);  // Not implemented.
  void operator=(const vtkTestFilter&);  // Not implemented.
 
};
 
#endif

#include "vtkTestFilter.h"
 
#include "vtkObjectFactory.h"
#include "vtkStreamingDemandDrivenPipeline.h"
#include "vtkInformationVector.h"
#include "vtkInformation.h"
#include "vtkDataObject.h"
#include "vtkSmartPointer.h"
 
vtkStandardNewMacro(vtkTestFilter);
 
int vtkTestFilter::RequestData(vtkInformation *vtkNotUsed(request),
                                             vtkInformationVector **inputVector,
                                             vtkInformationVector *outputVector)
{
 
  // get the info objects
  vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
 
  vtkInformation *outInfo = outputVector->GetInformationObject(0);
 
 
  // get the input and ouptut
  vtkPolyData *input = vtkPolyData::SafeDownCast(
      inInfo->Get(vtkDataObject::DATA_OBJECT()));
 
  vtkPolyData *output = vtkPolyData::SafeDownCast(
      outInfo->Get(vtkDataObject::DATA_OBJECT()));
 
  this->SetErrorCode(23);
  output->ShallowCopy(input);
 
  return 1;
}