Hi,    I am able to insert the stylesheet tag from inside a constructor of my new derived class.    Please find below the whole program.    But, I am still getting an error :    terminate called after throwing an instance of 'std::bad_cast'      what():  std::bad_cast    Aborted (core dumped)    on the statement :    xa << BOOST_SERIALIZATION_NVP(e);    in the code below.    The statements :    xa.putTag ("TESTING_XMLCLASS");    xa << BOOST_SERIALIZATION_NVP(tmp);    oa << BOOST_SERIALIZATION_NVP(e);    work as expected.    Can you please let me know what could be the reason for this? Regards, Girish # include <iostream> #include <fstream> #include <string> #include <boost/archive/tmpdir.hpp> #include <boost/archive/xml_oarchive.hpp> #include <boost/serialization/nvp.hpp> #include <boost/serialization/utility.hpp> #include <boost/serialization/version.hpp> #include <boost/archive/xml_oarchive.hpp> using namespace std; using namespace boost::archive; struct EMPLOYEE {     int id;     string name;     friend class boost::serialization::access;     template<class Archive> void serialize(Archive & ar, const unsigned int /* file_version */)     {         ar << BOOST_SERIALIZATION_NVP(id);         ar << BOOST_SERIALIZATION_NVP(name);     } }; class XMLArchive : public xml_oarchive_impl<xml_oarchive> {     public :     XMLArchive (ostream &os) : xml_oarchive_impl<xml_oarchive>(os, 0)     {         os.seekp (58);         string styletag = "?xml-stylesheet type=\"text/xsl\" href=\"XSLTFile.xsl\"?>\n";         string line1 = "<!DOCTYPE boost_serialization>\n";         string line2 = "<boost_serialization signature=\"serialization::archive\" version=\"5\">\n";         string buffer = styletag + line1 + line2;         os << buffer;         os.flush ();     }     void putTag (string tagname)     {         string tag_str = "<";         tag_str = tag_str + tagname + ">\n";         os << tag_str;     }     ~XMLArchive () {} }; int main (void) {     ofstream ofs ("XMLresult.xml");     XMLArchive xa(ofs); //  boost::archive::xml_oarchive oa(ofs);     xa.putTag ("TESTING_XMLCLASS");     string tmp = "TMPTMP";     xa << BOOST_SERIALIZATION_NVP(tmp);     struct EMPLOYEE e;     e.id = 101;     e.name = "James Bond";     xa << BOOST_SERIALIZATION_NVP(e); //  oa << BOOST_SERIALIZATION_NVP(e);     return 0; } --- On Thu, 2/18/10, Robert Ramey <ramey@rrsd.com> wrote: From: Robert Ramey <ramey@rrsd.com> Subject: Re: [Boost-users] XML Serialization: Putting Stylesheet tag inside XMLfile To: boost-users@lists.boost.org Date: Thursday, February 18, 2010, 5:27 PM

    File XSLTFile.xml contain stylesheet info.     * So, how is it possible to put a stylesheet related statement just after the 1st statement?     * Another query is, how to change the the tag name "boost_serialization" to something else?

You should be able to derive your new class from xml_archive_impl... There you can the initialization / windup functions.  There is/was and outdated example of how to do this in the documentation using portable binary archive as an example.  I don't know if it's still in there. Robert Ramey

Hi,    I tried including <boost/serialization/string.hpp> file but still getting the crash.    I have tried to resolve the problem by overloading << as follows :    XMLArchive & operator << (XMLArchive &xa, const struct EMPLOYEE &e)    {        xa << BOOST_SERIALIZATION_NVP(e.id);        xa << BOOST_SERIALIZATION_NVP(e.name);        return xa;    }    and calling it like this :    xa << e;    But, though I am getting the expected result, it still gives me a WARNING As follows :    test.cc: In function ‘int main()’:    test.cc:94: warning: ISO C++ says that these are ambiguous, even though the worst conversion for the first is better than the worst conversion for the second:    test.cc:72: note: candidate 1: XMLArchive& operator<<(XMLArchive&, const EMPLOYEE&)    /usr/include/boost/archive/detail/interface_oarchive.hpp:63: note: candidate 2: Archive& boost::archive::detail::interface_oarchive<Archive>::operator<<(T&) [with T = EMPLOYEE, Archive = boost::archive::xml_oarchive]    If I call "<<()" as :    operator <<(xa, e);    then it gives me no WARNING.    Also, "ltrace -C " for the crashed program is as below : __libc_start_main(0x804a554, 1, 0xbf973d44, 0x804beb0, 0x804bea0 <unfinished ...> std::ios_base::Init::Init()(0x804f554, 0x8967bc, 0, 0xb7f52438, 1)                               = 9 __cxa_atexit(0x804a2b8, 0x804f554, 0x804bf68, 0xb7f52438, 1)                                     = 0 __cxa_guard_acquire(0x804f558, 0x804f258, 0, 0x48bff4, 0x804beb0)                                = 1 __cxa_guard_acquire(0x804f560, 0x8049d93, 0x23b1f0, 0xb7f532f0, 0xb7f53a8c)                      = 1 boost::serialization::detail::extended_type_info_typeid_0::extended_type_info_typeid_0()(0x804f590, 0xbf973b74, 1, 1, 0) = 0xb6bf88 boost::serialization::detail::extended_type_info_typeid_0::type_register(std::type_info const&)(0x804f590, 0x804c7f4, 1, 1, 0) = 0x99d0008 __cxa_guard_release(0x804f560, 0x8049d93, 0x23b1f0, 0xb7f532f0, 0xb7f53a8c)                      = 0x804f560 __cxa_atexit(0x804b20c, 0x804f590, 0x804bf68, 0xb7f532f0, 0xb7f53a8c)                            = 0 boost::archive::detail::basic_oserializer::basic_oserializer(boost::serialization::extended_type_info const&)(0x804f584, 0x804f590, 0x804f38c, 0, 0x23b1f0) = 0x804f584 __cxa_guard_release(0x804f558, 0x804f258, 0, 0x48bff4, 0x804beb0)                                = 0x804f558 __cxa_atexit(0x804ae62, 0x804f584, 0x804bf68, 0x48bff4, 0x804beb0)                               = 0 std::basic_ofstream<char, std::char_traits<char> >::basic_ofstream(char const*, std::_Ios_Openmode)(0xbf973b1c, 0x804c0af, 48, 0x896818, 0xb7f52428) = 0xbf973ba8 boost::archive::xml_oarchive_impl<boost::archive::xml_oarchive>::xml_oarchive_impl(std::ostream&, unsigned int)(0xbf973c30, 0xbf973b1c, 0, 0x48bff4, 0) = 0 std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string()(0xbf973c64, 0xbf973b1c, 0, 0x48bff4, 0) = 0xbf973c64 std::string::operator=(char const*)(0xbf973c64, 0x804c0bd, 48, 0x896818, 0xb7f52428)             = 0xbf973c64 boost::archive::basic_xml_oarchive<boost::archive::xml_oarchive>::save_start(char const*)(0xbf973c30, 0x804c0c8, 0xff636d6e, 0xbf973c60, 0x804c0bd) = 0xbf973c30 boost::archive::detail::basic_oarchive::save_object(void const*, boost::archive::detail::basic_oserializer const&)(0xbf973c30, 0xbf973c60, 0x804f584, 0x1010101, 0x1010101 <unfinished ...> boost::archive::basic_xml_oarchive<boost::archive::xml_oarchive>::save_override(boost::archive::class_id_optional_type const&, int)(0xbf973c30, 0xbf973a0c, 0, 0, 0xaffd10) = 0xbf973b1c boost::archive::basic_xml_oarchive<boost::archive::xml_oarchive>::save_override(boost::archive::tracking_type const&, int)(0xbf973c30, 0xbf973a1f, 0, 0, 0xaffd10) = 0xbf973b1c boost::archive::basic_xml_oarchive<boost::archive::xml_oarchive>::save_override(boost::archive::version_type const&, int)(0xbf973c30, 0xbf973a10, 0, 0, 0xaffd10) = 0xbf973b1c __dynamic_cast(0xbf973c30, 0x804f4f0, 0x804c9ec, 0, 0xafd170)                                    = 0 __cxa_bad_cast(0xbf973c30, 0x804f4f0, 0x804c9ec, 0, 0xafd170 <unfinished ...> __gxx_personality_v0(1, 1, 0x432b2b00, 0x474e5543, 0x99d2480)                                    = 8 __gxx_personality_v0(1, 1, 0x432b2b00, 0x474e5543, 0x99d2480)                                    = 8 __gxx_personality_v0(1, 1, 0x432b2b00, 0x474e5543, 0x99d2480)                                    = 8 __gxx_personality_v0(1, 1, 0x432b2b00, 0x474e5543, 0x99d2480)                                    = 8 __gxx_personality_v0(1, 1, 0x432b2b00, 0x474e5543, 0x99d2480)                                    = 8 __gxx_personality_v0(1, 1, 0x432b2b00, 0x474e5543, 0x99d2480)                                    = 8 __gxx_personality_v0(1, 1, 0x432b2b00, 0x474e5543, 0x99d2480)                                    = 8 __gxx_personality_v0(1, 1, 0x432b2b00, 0x474e5543, 0x99d2480)                                    = 8 __gxx_personality_v0(1, 1, 0x432b2b00, 0x474e5543, 0x99d2480)                                    = 8 __gxx_personality_v0(1, 1, 0x432b2b00, 0x474e5543, 0x99d2480)                                    = 8 __gxx_personality_v0(1, 1, 0x432b2b00, 0x474e5543, 0x99d2480)                                    = 8 __gxx_personality_v0(1, 1, 0x432b2b00, 0x474e5543, 0x99d2480)                                    = 8 __gxx_personality_v0(1, 1, 0x432b2b00, 0x474e5543, 0x99d2480)                                    = 8 __gxx_personality_v0(1, 1, 0x432b2b00, 0x474e5543, 0x99d2480)                                    = 8 __gxx_personality_v0(1, 1, 0x432b2b00, 0x474e5543, 0x99d2480)                                    = 8 terminate called after throwing an instance of 'std::bad_cast' __gxx_personality_v0(1, 1, 0x432b2b00, 0x474e5543, 0x99d2480)                                    = 8 __gxx_personality_v0(1, 1, 0x432b2b00, 0x474e5543, 0x99d2480)                                    = 6 __gxx_personality_v0(1, 2, 0x432b2b00, 0x474e5543, 0x99d2480)                                    = 8 __gxx_personality_v0(1, 6, 0x432b2b00, 0x474e5543, 0x99d2480)                                    = 7   what():  std::bad_cast --- SIGABRT (Aborted) --- +++ killed by SIGABRT +++    So, does anyone know about any solution on,    * either, how to remove the WARNING    * or, how to avoid the crash?      I am using boost-1.37.0-6.fc11.i586 on FC11. Regards, Girish --- On Fri, 2/19/10, Robert Ramey <ramey@rrsd.com> wrote: From: Robert Ramey <ramey@rrsd.com> Subject: Re: [Boost-users] XML Serialization: Putting Stylesheet tag insideXMLfile To: boost-users@lists.boost.org Date: Friday, February 19, 2010, 4:34 PM girish hilage wrote:

Hi,

    I am able to insert the stylesheet tag from inside a constructor of my new derived class.     Please find below the whole program.

    But, I am still getting an error :     terminate called after throwing an instance of 'std::bad_cast'       what():  std::bad_cast     Aborted (core dumped)

    on the statement :     xa << BOOST_SERIALIZATION_NVP(e);     in the code below.

    The statements :     xa.putTag ("TESTING_XMLCLASS");     xa << BOOST_SERIALIZATION_NVP(tmp);     oa << BOOST_SERIALIZATION_NVP(e);     work as expected.

    Can you please let me know what could be the reason for this?

I can't.  The only thing that looks missing to me is: #include <boost/serialization/string.hpp> Robert Ramey _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users