Problems with char* serialization
Hello! My name is Ariel and this is my first time with boost. I spent a few days looking arround the serialization library, and right now I have a project with my first serialized classes. I spent some time reading the documentation and the tutorial. I am having problems serializing pointers. I am trying to serialize a const char* and it seems that doesn't work in the trivial way. This is my code: //----------------------------------------------------------------------------- // myserializeclass.h //----------------------------------------------------------------------------- #include <fstream> #include <boost/archive/binary_iarchive.hpp> #include <boost/archive/binary_oarchive.hpp> #include <boost/serialization/base_object.hpp> //----------------------------------------------------------------------------- class MySerializeClass { private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int uiVersion) { ar & m_pChar; } // members to serialize public: char* m_pChar; }; //----------------------------------------------------------------------------- BOOST_CLASS_TRACKING(MySerializeAbstractBase, ::boost::serialization::track_never) //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- // myserializeclass.cpp //----------------------------------------------------------------------------- int main() { MySerializeClass MySerializeClassObject; std::ofstream ofs(akFilename); boost::archive::binary_oarchive oa(ofs); oa << MySerializeClassObject; return 0; } //----------------------------------------------------------------------------- It doesn't compile. I get the following error: 1>c:\program files\microsoft visual studio 8\vc\platformsdk\include\boost\serialization\access.hpp(109) : error C2228: left of '.serialize' must have class/struct/union I know that this is my mistake, but I don't know how to fix it ;). I know that there is a lot of consideration about pointer serialization. Could you point me in the right direction? Thanks in advance! Ariel
serializing a pointer to a char is will only serialize one char. try serializating either an array of characters or an std::string Robert Ramey "Ariel Brunetto" <abrunetto@gmail.com> wrote in message news:c1bd22250804081016m1bf9c734s143a08b9a166a2bb@mail.gmail.com... Hello! My name is Ariel and this is my first time with boost. I spent a few days looking arround the serialization library, and right now I have a project with my first serialized classes. I spent some time reading the documentation and the tutorial. I am having problems serializing pointers. I am trying to serialize a const char* and it seems that doesn't work in the trivial way. This is my code: //----------------------------------------------------------------------------- // myserializeclass.h //----------------------------------------------------------------------------- #include <fstream> #include <boost/archive/binary_iarchive.hpp> #include <boost/archive/binary_oarchive.hpp> #include <boost/serialization/base_object.hpp> //----------------------------------------------------------------------------- class MySerializeClass { private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int uiVersion) { ar & m_pChar; } // members to serialize public: char* m_pChar; }; //----------------------------------------------------------------------------- BOOST_CLASS_TRACKING(MySerializeAbstractBase, ::boost::serialization::track_never) //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- // myserializeclass.cpp //----------------------------------------------------------------------------- int main() { MySerializeClass MySerializeClassObject; std::ofstream ofs(akFilename); boost::archive::binary_oarchive oa(ofs); oa << MySerializeClassObject; return 0; } //----------------------------------------------------------------------------- It doesn't compile. I get the following error: 1>c:\program files\microsoft visual studio 8\vc\platformsdk\include\boost\serialization\access.hpp(109) : error C2228: left of '.serialize' must have class/struct/union I know that this is my mistake, but I don't know how to fix it ;). I know that there is a lot of consideration about pointer serialization. Could you point me in the right direction? Thanks in advance! Ariel ------------------------------------------------------------------------------ _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
My pointer to a char is actually an array. Is it possible to serialize it in this way? Ariel On Tue, Apr 8, 2008 at 4:54 PM, Robert Ramey <ramey@rrsd.com> wrote:
serializing a pointer to a char is will only serialize one char.
try serializating either an array of characters or an std::string
Robert Ramey
"Ariel Brunetto" <abrunetto@gmail.com> wrote in message news:c1bd22250804081016m1bf9c734s143a08b9a166a2bb@mail.gmail.com... Hello!
My name is Ariel and this is my first time with boost. I spent a few days looking arround the serialization library, and right now I have a project with my first serialized classes. I spent some time reading the documentation and the tutorial. I am having problems serializing pointers. I am trying to serialize a const char* and it seems that doesn't work in the trivial way.
This is my code:
//----------------------------------------------------------------------------- // myserializeclass.h
//----------------------------------------------------------------------------- #include <fstream> #include <boost/archive/binary_iarchive.hpp> #include <boost/archive/binary_oarchive.hpp> #include <boost/serialization/base_object.hpp>
//----------------------------------------------------------------------------- class MySerializeClass { private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int uiVersion) { ar & m_pChar; } // members to serialize public: char* m_pChar; };
//----------------------------------------------------------------------------- BOOST_CLASS_TRACKING(MySerializeAbstractBase, ::boost::serialization::track_never)
//-----------------------------------------------------------------------------
//----------------------------------------------------------------------------- // myserializeclass.cpp
//----------------------------------------------------------------------------- int main() { MySerializeClass MySerializeClassObject;
std::ofstream ofs(akFilename); boost::archive::binary_oarchive oa(ofs);
oa << MySerializeClassObject; return 0; }
//-----------------------------------------------------------------------------
It doesn't compile. I get the following error:
1>c:\program files\microsoft visual studio 8\vc\platformsdk\include\boost\serialization\access.hpp(109) : error C2228: left of '.serialize' must have class/struct/union
I know that this is my mistake, but I don't know how to fix it ;). I know that there is a lot of consideration about pointer serialization. Could you point me in the right direction?
Thanks in advance! Ariel
------------------------------
_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
-- ________________ Ariel Brunetto www.aquadize.com
binary_object will do it - but you have to create the array by hand. look at using a reference to an array in stead of a pointer. Robert Ramey "Ariel Brunetto" <abrunetto@gmail.com> wrote in message news:c1bd22250804081247i4c34489fh5f69a0d0c8595b73@mail.gmail.com... My pointer to a char is actually an array. Is it possible to serialize it in this way? Ariel On Tue, Apr 8, 2008 at 4:54 PM, Robert Ramey <ramey@rrsd.com> wrote: serializing a pointer to a char is will only serialize one char. try serializating either an array of characters or an std::string Robert Ramey "Ariel Brunetto" <abrunetto@gmail.com> wrote in message news:c1bd22250804081016m1bf9c734s143a08b9a166a2bb@mail.gmail.com... Hello! My name is Ariel and this is my first time with boost. I spent a few days looking arround the serialization library, and right now I have a project with my first serialized classes. I spent some time reading the documentation and the tutorial. I am having problems serializing pointers. I am trying to serialize a const char* and it seems that doesn't work in the trivial way. This is my code: //----------------------------------------------------------------------------- // myserializeclass.h //----------------------------------------------------------------------------- #include <fstream> #include <boost/archive/binary_iarchive.hpp> #include <boost/archive/binary_oarchive.hpp> #include <boost/serialization/base_object.hpp> //----------------------------------------------------------------------------- class MySerializeClass { private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int uiVersion) { ar & m_pChar; } // members to serialize public: char* m_pChar; }; //----------------------------------------------------------------------------- BOOST_CLASS_TRACKING(MySerializeAbstractBase, ::boost::serialization::track_never) //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- // myserializeclass.cpp //----------------------------------------------------------------------------- int main() { MySerializeClass MySerializeClassObject; std::ofstream ofs(akFilename); boost::archive::binary_oarchive oa(ofs); oa << MySerializeClassObject; return 0; } //----------------------------------------------------------------------------- It doesn't compile. I get the following error: 1>c:\program files\microsoft visual studio 8\vc\platformsdk\include\boost\serialization\access.hpp(109) : error C2228: left of '.serialize' must have class/struct/union I know that this is my mistake, but I don't know how to fix it ;). I know that there is a lot of consideration about pointer serialization. Could you point me in the right direction? Thanks in advance! Ariel -------------------------------------------------------------------------- _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users -- ________________ Ariel Brunetto www.aquadize.com ------------------------------------------------------------------------------ _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
Sorry, but I dont understand. The documentation says that I can serialize a pointer to a Serializable type such as a primitive type. Is this true? Ariel On Tue, Apr 8, 2008 at 7:28 PM, Robert Ramey <ramey@rrsd.com> wrote:
binary_object will do it - but you have to create the array by hand.
look at using a reference to an array in stead of a pointer.
Robert Ramey
"Ariel Brunetto" <abrunetto@gmail.com> wrote in message news:c1bd22250804081247i4c34489fh5f69a0d0c8595b73@mail.gmail.com... My pointer to a char is actually an array. Is it possible to serialize it in this way?
Ariel
On Tue, Apr 8, 2008 at 4:54 PM, Robert Ramey <ramey@rrsd.com> wrote:
serializing a pointer to a char is will only serialize one char.
try serializating either an array of characters or an std::string
Robert Ramey
"Ariel Brunetto" <abrunetto@gmail.com> wrote in message news:c1bd22250804081016m1bf9c734s143a08b9a166a2bb@mail.gmail.com... Hello!
My name is Ariel and this is my first time with boost. I spent a few days looking arround the serialization library, and right now I have a project with my first serialized classes. I spent some time reading the documentation and the tutorial. I am having problems serializing pointers. I am trying to serialize a const char* and it seems that doesn't work in the trivial way.
This is my code:
//----------------------------------------------------------------------------- // myserializeclass.h
//----------------------------------------------------------------------------- #include <fstream> #include <boost/archive/binary_iarchive.hpp> #include <boost/archive/binary_oarchive.hpp> #include <boost/serialization/base_object.hpp>
//----------------------------------------------------------------------------- class MySerializeClass { private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int uiVersion) { ar & m_pChar; } // members to serialize public: char* m_pChar; };
//----------------------------------------------------------------------------- BOOST_CLASS_TRACKING(MySerializeAbstractBase, ::boost::serialization::track_never)
//-----------------------------------------------------------------------------
//----------------------------------------------------------------------------- // myserializeclass.cpp
//----------------------------------------------------------------------------- int main() { MySerializeClass MySerializeClassObject;
std::ofstream ofs(akFilename); boost::archive::binary_oarchive oa(ofs);
oa << MySerializeClassObject; return 0; }
//-----------------------------------------------------------------------------
It doesn't compile. I get the following error:
1>c:\program files\microsoft visual studio 8\vc\platformsdk\include\boost\serialization\access.hpp(109) : error C2228: left of '.serialize' must have class/struct/union
I know that this is my mistake, but I don't know how to fix it ;). I know that there is a lot of consideration about pointer serialization. Could you point me in the right direction?
Thanks in advance! Ariel
------------------------------
_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
-- ________________ Ariel Brunetto www.aquadize.com
------------------------------
_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
-- ________________ Ariel Brunetto www.aquadize.com
Sorry, but I dont understand. The documentation says that I can serialize a pointer to a Serializable type such as a primitive type. Is this true?
Yes, but in case of pointer to const char your primitive type is const char. _________________________________________________________________ News, entertainment and everything you care about at Live.com. Get it now! http://www.live.com/getstarted.aspx
Yes, but I am trying to serialize a char*, not a const char*. Is it possible? Thank you, Ariel On Wed, Apr 9, 2008 at 4:17 AM, Igor R. <igor_rubinov@hotmail.com> wrote:
Sorry, but I dont understand. The documentation says that I can serialize a pointer to a Serializable type such as a primitive type. Is this true?
Yes, but in case of pointer to const char your primitive type is const char.
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_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
-- ________________ Ariel Brunetto www.aquadize.com
Yes, but I am trying to serialize a char*, not a const char*. Is it possible?
Not directly. If you cannot reengineer the use of the char* do something like this: (apologies if you know this already) // char* m_POD; a pointer to plain old char data // size_t sizePOD; // how big is the POD data //... if (Archive::is_saving::value) { // create a vector and fill with POD std::vector<char> vec(m_POD,m_POD+sizePOD); // now serialize ar & BOOST_SERIALIZATION_NVP(vec); } else if (Archive::is_loading::value) { std::vector<char> vec; ar & BOOST_SERIALIZATION_NVP(vec); // now handle deallocation of existing POD // reallocation and copying from vec if (m_POD) { delete m_POD; } // allocate POD buffer m_POD = new char[vec.size()]; // copy from deserialized vector std::copy(vec.begin(),vec.end(),m_POD); } HTH ----- Original Message ----- From: Ariel Brunetto To: boost-users@lists.boost.org Sent: Wednesday, April 09, 2008 11:59 AM Subject: Re: [Boost-users] Problems with char* serialization Yes, but I am trying to serialize a char*, not a const char*. Is it possible? Thank you, Ariel On Wed, Apr 9, 2008 at 4:17 AM, Igor R. <igor_rubinov@hotmail.com> wrote: > Sorry, but I dont understand. The documentation says that I can serialize a pointer to a Serializable type such as a primitive type. Is this true? Yes, but in case of pointer to const char your primitive type is const char. ---------------------------------------------------------------------------- Get news, entertainment and everything you care about at Live.com. Check it out! _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users -- ________________ Ariel Brunetto www.aquadize.com ------------------------------------------------------------------------------ _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
Hi Ariel, if you want to use char* to deal with text, I'd recommend to use std::string instead, if you're interested in an array, you might want to consider using a std::vector. If you can't do this for some reason, here's some code which serializes a DREAL* (DREAL=double) and should work similarly for char*: friend class boost::serialization::access; template<class Archive> void save(Archive & ar, const unsigned int version) const { ar & num_labels; for (int i=0; i < num_labels; ++i) { ar & labels[i]; } } template<class Archive> void load(Archive & ar, const unsigned int version) { ar & num_labels; if (num_labels > 0) { labels = new DREAL[num_labels]; for (int i=0; i< num_labels; ++i) { ar & labels[i]; } } } BOOST_SERIALIZATION_SPLIT_MEMBER(); Cheers, Chris Ariel Brunetto wrote:
Yes, but I am trying to serialize a char*, not a const char*. Is it possible?
Thank you, Ariel On Wed, Apr 9, 2008 at 4:17 AM, Igor R. <igor_rubinov@hotmail.com <mailto:igor_rubinov@hotmail.com>> wrote:
> Sorry, but I dont understand. The documentation says that I can serialize a pointer to a Serializable type such as a primitive type. Is this true?
Yes, but in case of pointer to const char your primitive type is const char.
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-- ________________ Ariel Brunetto www.aquadize.com <http://www.aquadize.com> ------------------------------------------------------------------------
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First of all, thank to everyone you for the help. What actually I want to do is to serialize large floats arrays, float* not std::vector, but I could evaluate to use std::vector instead of float*. Thanks a lot! Ariel On Wed, Apr 9, 2008 at 12:31 PM, Christian Widmer <cwidmer@tuebingen.mpg.de> wrote:
Hi Ariel,
if you want to use char* to deal with text, I'd recommend to use std::string instead, if you're interested in an array, you might want to consider using a std::vector. If you can't do this for some reason, here's some code which serializes a DREAL* (DREAL=double) and should work similarly for char*:
friend class boost::serialization::access; template<class Archive> void save(Archive & ar, const unsigned int version) const { ar & num_labels; for (int i=0; i < num_labels; ++i) { ar & labels[i]; } }
template<class Archive> void load(Archive & ar, const unsigned int version) {
ar & num_labels; if (num_labels > 0) { labels = new DREAL[num_labels]; for (int i=0; i< num_labels; ++i) { ar & labels[i]; }
} }
BOOST_SERIALIZATION_SPLIT_MEMBER();
Cheers, Chris
Ariel Brunetto wrote:
Yes, but I am trying to serialize a char*, not a const char*. Is it possible?
Thank you, Ariel On Wed, Apr 9, 2008 at 4:17 AM, Igor R. <igor_rubinov@hotmail.com <mailto:igor_rubinov@hotmail.com>> wrote:
> Sorry, but I dont understand. The documentation says that I can serialize a pointer to a Serializable type such as a primitive type. Is this true?
Yes, but in case of pointer to const char your primitive type is const char.
------------------------------------------------------------------------
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_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org <mailto:Boost-users@lists.boost.org> http://lists.boost.org/mailman/listinfo.cgi/boost-users
-- ________________ Ariel Brunetto www.aquadize.com <http://www.aquadize.com> ------------------------------------------------------------------------
_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
-- ________________ Ariel Brunetto www.aquadize.com
you can but if you serialize a pointer to a character I don't think you'll get back what you want. Upon loading, the system will create a single new character and return a pointer to it. Somehow I don't think that's what you want. Robert Ramey "Ariel Brunetto" <abrunetto@gmail.com> wrote in message news:c1bd22250804081950k2342e4d1l956cc5c005d605c8@mail.gmail.com... Sorry, but I dont understand. The documentation says that I can serialize a pointer to a Serializable type such as a primitive type. Is this true? Ariel On Tue, Apr 8, 2008 at 7:28 PM, Robert Ramey <ramey@rrsd.com> wrote: binary_object will do it - but you have to create the array by hand. look at using a reference to an array in stead of a pointer. Robert Ramey "Ariel Brunetto" <abrunetto@gmail.com> wrote in message news:c1bd22250804081247i4c34489fh5f69a0d0c8595b73@mail.gmail.com... My pointer to a char is actually an array. Is it possible to serialize it in this way? Ariel On Tue, Apr 8, 2008 at 4:54 PM, Robert Ramey <ramey@rrsd.com> wrote: serializing a pointer to a char is will only serialize one char. try serializating either an array of characters or an std::string Robert Ramey "Ariel Brunetto" <abrunetto@gmail.com> wrote in message news:c1bd22250804081016m1bf9c734s143a08b9a166a2bb@mail.gmail.com... Hello! My name is Ariel and this is my first time with boost. I spent a few days looking arround the serialization library, and right now I have a project with my first serialized classes. I spent some time reading the documentation and the tutorial. I am having problems serializing pointers. I am trying to serialize a const char* and it seems that doesn't work in the trivial way. This is my code: //----------------------------------------------------------------------------- // myserializeclass.h //----------------------------------------------------------------------------- #include <fstream> #include <boost/archive/binary_iarchive.hpp> #include <boost/archive/binary_oarchive.hpp> #include <boost/serialization/base_object.hpp> //----------------------------------------------------------------------------- class MySerializeClass { private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int uiVersion) { ar & m_pChar; } // members to serialize public: char* m_pChar; }; //----------------------------------------------------------------------------- BOOST_CLASS_TRACKING(MySerializeAbstractBase, ::boost::serialization::track_never) //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- // myserializeclass.cpp //----------------------------------------------------------------------------- int main() { MySerializeClass MySerializeClassObject; std::ofstream ofs(akFilename); boost::archive::binary_oarchive oa(ofs); oa << MySerializeClassObject; return 0; } //----------------------------------------------------------------------------- It doesn't compile. I get the following error: 1>c:\program files\microsoft visual studio 8\vc\platformsdk\include\boost\serialization\access.hpp(109) : error C2228: left of '.serialize' must have class/struct/union I know that this is my mistake, but I don't know how to fix it ;). I know that there is a lot of consideration about pointer serialization. Could you point me in the right direction? Thanks in advance! Ariel ---------------------------------------------------------------------- _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users -- ________________ Ariel Brunetto www.aquadize.com -------------------------------------------------------------------------- _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users -- ________________ Ariel Brunetto www.aquadize.com ------------------------------------------------------------------------------ _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
participants (5)
-
Ariel Brunetto -
Christian Widmer -
Igor R. -
Jerry -
Robert Ramey