Segmentation Fault (Core Dumped)

Vijaeendra

I have got VTK 5.6.1 and Qt 4.6.2 installed on my opensolaris system. I wrote a code which has basic function of showing the VTk viewPort and rendering an image on it. The Class code is as given below.

@MainWindow::MainWindow(QWidget *parent):QDialog(parent)
{
//qvtkWidget= new QVTKWidget;
button = new QPushButton("Do Something");
label = new QLabel("Garbage Value");

connect(button, SIGNAL(clicked()),new helper(label, this), SLOT(onclicked()));
qvtkWidget->resize(256,256);

vtkPNGReader* reader = vtkPNGReader::New();
char fname[] ="/export/home/sol/Downloads/vtk/vtk.png";
reader->SetFileName(fname);

vtkImageViewer* image_view = vtkImageViewer::New();
image_view->SetInputConnection(reader->GetOutputPort());

qvtkWidget->SetRenderWindow(image_view->GetRenderWindow());
image_view->SetupInteractor(qvtkWidget->GetRenderWindow()->GetInteractor());

image_view->SetColorLevel(138.5);
image_view->SetColorWindow(233);*/

//label->setText("My Value");

QGridLayout *layout = new QGridLayout;

// layout->addWidget(qvtkWidget);
layout->addWidget(button);
layout->addWidget(label);
setLayout(layout);
}

void MainWindow::MyEventHandler()
{
//Label setting
label->setText("Dude It works");

//VTK Widget interaction
vtkPNGReader* reader = vtkPNGReader::New();
char fname[] ="/export/home/sol/Downloads/vtk/Earth-icon.png";
reader->SetFileName(fname);

vtkImageViewer* image_view = vtkImageViewer::New();
image_view->SetInputConnection(reader->GetOutputPort());

qvtkWidget->SetRenderWindow(image_view->GetRenderWindow());
image_view->SetupInteractor(qvtkWidget->GetRenderWindow()->GetInteractor());

image_view->SetColorLevel(138.5);
image_view->SetColorWindow(233);

}

helper::helper(QLabel *label, MainWindow *reciever)
{
mylabel= label;
this->reciever=reciever;
}

void helper:: onclicked()
{
//reciever->changetext(mylabel);
reciever->MyEventHandler();

}

void MainWindow::changetext(QLabel *label)
{
label->setText("changed");
} @

But when I run the application file It says segmentation fault(Core Dumped) . But I don see anything wrong with the pointers or anything that I have used.
Also when I include the (LIBS += -L/usr/local/lib/vtk-5.6 -lQVTK -lvtkRendering -lvtkIO -lvtkFiltering) …. in the .pro file I have this problem. Though I am not using any of its classes(QVTKWidget etc..,) But if I comment that line it works fine.

Its a run time error and is related to the Shared Libraries.

I have also set the LD_LIBRARY_PATH!!!

What Might have gone wrong.

I am totally stuck, Please Hel

dangelog

Run into valgrind using the memcheck tool.

Vijaeendra

I ll do that., But might there be a chance of the VTK library built wrongly?? What might be the other possibilities why it failing?

VitorAMJ

@ //qvtkWidget= new QVTKWidget;
button = new QPushButton("Do Something");
label = new QLabel("Garbage Value");

connect(button, SIGNAL(clicked()),new helper(label, this), SLOT(onclicked()));
qvtkWidget->resize(256,256);@

Why is the QVTKWidget instance creation commented? You are using it as a pointer when resizing it, but its creation is commented in the constructor
@//qvtkWidget= new QVTKWidget;@

Maybe uncommenting that line, :) , can solve the problem. Just a guess...

Vijaeendra

Thanks.., but the problem i m getting stuck is different!! :-) May be I have gone wrong in the building process.

VitorAMJ

I am sorry I can't help

bq. I ll do that., But might there be a chance of the VTK library built wrongly?? What might be the other possibilities why it failing?

Look, I don't want to alarm you, but my colleagues experience setting vtk up is not good...