[vtkusers] Crash/Timing problem of QVTKWidget

[Lodron, Gerald]

Hello,

I have a minimal qt program (qt 4.8.1) with vtk 5.10.1 whereby I use a qvtkwidget (code snippet below). The problem is that the programm sometimes (not always) crashes on the w.show() function of the QMainWindow. The depug trace is not much helpful, there is a uninitialized pointer access in:
>	nvoglv64.dll!0000000069b83157() 	
 	[Frames below may be incorrect and/or missing, no symbols loaded for nvoglv64.dll]	
 	nvoglv64.dll!0000000069b85c58() 	
 	nvoglv64.dll!0000000069b85f94() 	
 	nvoglv64.dll!0000000069c88fc6() 	
 	kernel32.dll!000000007721652d() 	
 	ntdll.dll!00000000776bc521() 	
The problem exists in 32 bit, 64 bit release and debug mode. When I set a breakpoint at the constructor of qvtkwidget the crashes seem to be less often... a sleep helps a little bit but that's not the fine way....
I already checked all vtk libs and program dependencies with a dependency walker (depends), the all seem correct for me (all debug dlls with correct bit mode)

Thanks for any help


int main( int argc, char* argv[])
{
    try
    {
        QApplication a(argc, argv);

        CMainGUI w;

        w.show();

        return a.exec();
    }
    catch(...)
    {
        return 0;
    }
    return 0;
}

Whereby CMainGUI is a simple QMainWindow:
class CMainGUI : public QMainWindow
{
    Q_OBJECT

public:
    CMainGUI();
    ~CMainGUI();
private:

    QVTKWidget*     m_poVTKWidget;
    vtkRenderer*    m_poRenderer;
    //QLabel*         m_poFilePathLabel;
};
With following code:
CMainGUI::CMainGUI()
{
    m_poRenderer = vtkRenderer::New();
    m_poVTKWidget = new QVTKWidget(this,QFlag(0));  
    m_poVTKWidget->GetRenderWindow()->AddRenderer(m_poRenderer);
    this->setCentralWidget( m_poVTKWidget );
}

CMainGUI::~CMainGUI()
{
    m_poRenderer->Delete();
    m_poRenderer = NULL;
}
_________________________________________________________________

JOANNEUM RESEARCH Forschungsgesellschaft mbH
                                
DIGITAL - Institute for Information and Communication Technologies
Steyrergasse 17, 8010 Graz, Austria
 
phone: +43 316 876-1751
fax: +43 316 8769-1751
e-mail: gerald.lodron at joanneum.at 
web: www.joanneum.at/digital
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