C++ VTK reading and saving data from several files - c++

Question

I am new to VTK and my goal is to be able to store information from several files into a vector so then I can separately use filters on some files or show it on QVTKWidget.
My question is what type of vector should I create?
So far I have this:
class for Reader that are creating my reader and pushing it back:
template<class TReader> vtkDataSet *readVTKfile(std::string fileName)
{
vtkSmartPointer<TReader> reader =
vtkSmartPointer<TReader>::New();
reader->SetFileName(fileName.c_str());
reader->Update();
reader->GetOutput()->Register(reader);
return vtkDataSet::SafeDownCast(reader->GetOutput());
}
And here is the problem with how can I use it for my vector:
QStringList filenames = QFileDialog::getOpenFileNames(this, tr("Choose"), "", tr("Vtk files (*.vtk)"));
std::vector<std::string> inputFilenames(filenames.count());
if (!filenames.isEmpty())
{
for (int i = 0; i < filenames.count(); i++)
inputFilenames.push_back(filenames.at(i).toLocal8Bit().constData());
}
std::vector<vtkDataSet*> data(inputFilenames.size()); // what type it should be?
for (int i = 0; i < inputFilenames.size(); i++)
{
data[i] = readVTKfile<vtkGenericDataObjectReader>(inputFilenames[i]);
}
vtkSmartPointer<vtkPolyDataMapper> objectMapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
//objectMapper->SetInputConnection(reader->GetOutputPort());
objectMapper->SetInputConnection(data[0]); // so then I can use it for example for showing?
vtkSmartPointer<vtkActor> objectActor =
vtkSmartPointer<vtkActor>::New();
objectActor->SetMapper(objectMapper);
// VTK Renderer
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
renderer->AddActor(objectActor);
// VTK/Qt wedded
this->qvtkWidgetLeft->GetRenderWindow()->AddRenderer(renderer);

Answer 1

QStringList filenames = QFileDialog::getOpenFileNames(this, tr("Choose"), "", tr("Vtk files (*.vtk)"));
// use the range based for, and .toStdString if you wanna std::string from QString
std::vector<std::string> inputFilenames(filenames.count());
for(const auto& filename : filenames) {
inputFilenames.push_back(filename.toStdString());
}
// I'm not sure if this is the right type, but it's what the documentation uses
std::vector<vtkAlgorithmOutput*> data(inputFilenames.size());
for (int i = 0; i < inputFilenames.size(); i++)
{
data[i] = readVTKfile<vtkGenericDataObjectReader>(inputFilenames[i]);
}
vtkSmartPointer<vtkPolyDataMapper> objectMapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
objectMapper->SetInputConnection(data[0]);
vtkSmartPointer<vtkActor> objectActor =
vtkSmartPointer<vtkActor>::New();
objectActor->SetMapper(objectMapper);
// VTK Renderer
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
renderer->AddActor(objectActor);
// VTK/Qt wedded
this->qvtkWidgetLeft->GetRenderWindow()->AddRenderer(renderer);