Markus Werle wrote:
I still cannot see how to avoid this extra <value> tag.
Did it become clear now?
OK - I think I see the problem now.
There is a solution - but it's slightly tricky.
a) study the document and example on inheriting
from an existing archive.
b) derive your new archive extended_xml_oarchive
from xml_oarchive_impl
c) This will look something like:
class extended_xml_oarchive :
public xml_oarchive_impl
{
public:
// pass on most types to normal handling in the base class xml_oarchive
template<class T>
void save(const T & t){
xml_oarchive_implstd::ostream::save(t);
}
// special handling for an MFC CString - treat as if primitive
void save(const CString &s){
// just output the string using the output stream from base class
// basic_text_oprimitive
os << s; // assuming this is defined for CString
);
extended_xml_oarchive(std::ostream & os, unsigned int flags = 0) :
extended_xml_oarchive_impl(os, flags){}
~extended_xml_oarchive(){}
};
and similarly for extended_xml_iarchive.
This will handle CString similar to the way that std::string is handled.
Note that the implementation of the function save(const CString ...
isn't too robust in that it doesn't handle special characters like
"<" which will muck up the xml. If you want to make this more
robust - look to the definition for the serialization of std::string
in xml_oarchive_impl.hpp for inspiration.
Robert Ramey
