Help with VizExtension.command?

[shivanangel]

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

#pragma once

#include <viz\Extension>
#include <viz\python>
#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<viz::ExtensionOSGNode> node_;

};

MyExtension .ccp

#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();
}