WorldViz User Forum - Help with VizExtension.command?

I'm working to port a new version of our volume rendered over to C++ as a Vizard extension, but I'm running into some issues using the VizExtension.command method.

I followed your documentation, and I can construct a simple cube when I call my extensions .addNode() method.

However, when I try to use the .command method Vizard crashes on me every time.

Specifically, I'm just trying to send back bogus data from the C++ extension to Python using the data.set() method.

MyExtension Header

Code:

#pragma once



#include 

#include 

#include "MyNode.h"





class MyExtension : public viz::Extension

{

public:

        MyExtension(void);

        virtual const char* getName() const;

        virtual viz::Referenced* createNode(viz::Data &data);

        virtual void command( viz::Data& data);



protected:

        virtual ~MyExtension(void);



protected:

        osg::ref_ptr node_;



};

MyExtension .ccp

Code:

#include "MyExtension.h"



MyExtension::MyExtension(void)

{

}



MyExtension::~MyExtension(void)

{

}



const char* MyExtension::getName() const

{

        return "My Extension";

}



viz::Referenced* MyExtension::createNode(viz::Data &data)

{

        node_ = new DummyNode;

        return node_.get();

}



void MyExtension::command( viz::Data& data )

{

        int command = data.getInt( "command" );



        switch(command)

        {

                case 1:        //Passing in the camera's normal

                        float tempX = data.getFloat("x");

                        data.set(  PYTHON_RETURN_OBJECT, PYTHON_STRING("This is a test.") );

                        break;

        }

}



extern "C" __declspec(dllexport) viz::Extension* CreateVizardExtension(viz::Data &data)

{

        return new MyExtension();

}