Memory leak in QVTK widget and PCL visualizer

Development
1

I m using Ubuntu 20.04 with Qt5.12 for developing a QT project which uses a QVTK widget to display a 3D PCL visualiser. I m facing memory leak issues after defining the visualiser and vtk widget relationship. The header file contents are as follows:

class SiLS : public QMainWindow
{
    Q_OBJECT

public:

    SiLS(QWidget *parent = nullptr);
    ~SiLS();

private:

    Ui::SiLS *ui;
    pcl::visualization::PCLVisualizer::Ptr viewer_3D;
};

The cpp file contents are as follows:

SiLS::SiLS(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::SiLS)
{
    ui->setupUi(this);

    viewer_3D.reset (new pcl::visualization::PCLVisualizer ("viewer_3D", false));
    viewer_3D->setupInteractor (ui->qvtkWidget->GetInteractor (), ui->qvtkWidget->GetRenderWindow ());
    ui->qvtkWidget->SetRenderWindow(viewer_3D->getRenderWindow());
}

SiLS::~SiLS()
{
    delete ui;
}

Only these 3 lines of code in the constructor is giving lot of memory leak issues. How to destruct the qvtkwidget properly?

2

Thanks for reporting the problem.

What do you exactly mean by “memory leaks” ? Are you referring to issues discovered using tool like memcheck, or are these reported as vtkDebugLeaks ?

To better understand how the different objects are created, could you share a like to a minimal GitHub project allowing to reproduce the problem ? The project would include relevant source files, a CMakeLists.txt, a README.md detailing how to download and build the dependencies (VTK, pcl, …)

Looking at the snippet you shared, it is unclear how the Ui::SiLS object is implemented.

3

Memory leak issues were generated by valgrind which is present in Qt Creator. I have committed the project files to Github here. Readme file shows detailed installation setup.

4

One of the issue trace back is as shown below:

image
image1253×140 52.7 KB

How to debug in these lib files?