Von: boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org] Im Auftrag von Robert Ramey Gesendet: Freitag, 23. März 2007 17:09 An: boost-users@lists.boost.org Betreff: Re: [Boost-users] Serialization: Serialize into multiple archives

  "Stefan Holzmann" wrote in message news:34183.4475555972$1174634703@news.gmane.org... Hello,

I'am new to the boost serialize libary and have the following question.

At my data acquisition application I have a workspace object which contain several recorded data objects (measurements) which should be stored into separate archives.   **** The first idea that occurs to me would be to use the iostreams library to create a fancier stream which transform any write into two separate ones.  Since the serialization library relies on streams, this would create multiple archives from one serialization.     The workspace objects needs to store references (weak pointers) on objects inside the measurement archives (e.g. references from views which should be serialized).   **** which it can do.  The will automatically serialize the references being pointed to.   It should be possible to have the same measurement archive references from more than one workspace object.   **** If the archives are reloaded- you'll get new instances of the referenced views.  Probably not what you want.

Is this possible with the boost serialization libary?   *** You might be able to get what you want.  But this would require a deeper understanding of the library than is usually necessary.   Righ now I don't know how the object tracking is working in detail, is

Sorry I think the explanation of my problem wasn't clear enough. I want to store some of my objects into a different archive without duplicating them. I have some kind of project file (Workspace) at my application which should be the "main" archiv and several document files (measurment data). The serialization process always start by loading/save this workspace object, because this object stores the location of the current opened measument objects. I noticed that I can create and load this kind of archiv structue as following: template<class Archive> void save(Archive & ar, const unsigned int version) const { ar & BOOST_SERIALIZATION_NVP(m_FileName); // store the file name of the archiv std::ofstream ofs(m_FileName.c_str()); assert(ofs.good()); boost::archive::xml_oarchive oa(ofs); oa << BOOST_SERIALIZATION_NVP(m_SignalList); // store the child objects into the new archiv } But I don't know how I can serialize a reference on a object located at a different archiv. I need such references from workspace object to store a persistent view object. The Object Tracking works only within a archive. Any ideas or suggestions on this problem? Regards, Stefan there a more detailed documentation on this?

  *** read the docs and the code.   Robert Ramey

Stefan

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