[osg-users] Convert a node into byte array, serialize a node?

[James Lue]

Hi,

I want to send a geometry or a node to other computer via socket. Some people suggest serialization and de-serialization, but I'm not sure how exactly to do so. Can someone giva me a hint?

Right now I think I can write the node by osgDB::writeNodeFile and read the file as a byte array then send it out. But I wonder if it's possible that I can convert the node into byte array without writing to disk and then read it again.

Thank you!

Cheers,
James

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[Rafa Gaitan]

Hi James,

I did something similar, and is easy, but you need to use the ReaderWriter API, that supports serialization to a stream. Here is my code:

void IOSocket::writeObject( const osg::Object* obj)

{

    OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_rwMutex);

    if(!_rw.valid())

    {   

        _rw = osgDB::Registry::instance()->getReaderWriterForExtension("osgt");

        if(!_rw.valid())

            throw SocketException("Not valid ReaderWriter for osg::Object");

    }   

    std::stringstream sstr;

    _rw->writeObject(*obj,sstr);

    (*this) << sstr.str();

}

osg::Object* IOSocket::readObject()

{

    OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_rwMutex);

    if(!_rw.valid())

    {   

        _rw = osgDB::Registry::instance()->getReaderWriterForExtension("osgt");

        if(!_rw.valid())

            throw SocketException("Not valid ReaderWriter for osg::Object");

    }   

    std::string str;

    (*this) >> str;

    std::cout << str << std::endl;

    std::stringstream sstr(str);

    return _rw->readObject(sstr).takeObject();

}

_rw has this definition: osg::ref_ptr<osgDB::ReaderWriter> _rw;

and this line:

osgDB::Registry::instance()->getReaderWriterForExtension("osgt");

Selects the new ascii OSG serializer, but if you set "osgb" then the data is serialized in binary format and probably will give you better performance.

Cheers,

Rafa.

2012/6/7 James Lue <jl...@ucsd.edu>

--
Rafael Gaitán Linares
CTO at Mirage Technologies S.L - http://www.mirage-tech.com
gvSIG3D Developer - http://gvsig3d.blogspot.com

[Rafa Gaitan]

Ops! I forgot to mention that in my IOSocket class I have the << operator overloaded to support send and receive data from strings, but there you can use "send" and "recv" of the sockets API.

Rafa.

2012/6/7 Rafa Gaitan <rafa....@gmail.com>

[James Lue]

> --
> Rafael Gaitán Linares
> CTO at Mirage Technologies S.L - http://www.mirage-tech.com (http://www.mirage-tech.com)
> gvSIG3D Developer - http://gvsig3d.blogspot.com (http://gvsig3d.blogspot.com)
>
> ------------------
> Post generated by Mail2Forum

Thank you Rafael! This is what I want!

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Read this topic online here:

http://forum.openscenegraph.org/viewtopic.php?p=48122#48122