Dear Robert Ramey, I'm SO sorry to bother you again! When I compile Boost::Serialization(version 1.32.0) using msvc71+stlport4.6.2, I fond compile error in the file "xml_escape.hpp" line 47. I followed the way compile shown , and find the cause is in file "xml_woarchive_impl.ipp" line 108 . I think it is more reasonable to alter the function like this : /////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////// #ifndef BOOST_NO_STD_WSTRING template<class Archive> void xml_woarchive_impl<Archive>::save(const std::wstring & ws){ typedef iterators::xml_escapestd::wstring::const_iterator xmbtows; // This is changed by zhengyi !! otherwise ,using stlport can not // compile successfully std::copy( xmbtows(BOOST_MAKE_PFTO_WRAPPER(ws.begin()/*ws.data()*/)), xmbtows(BOOST_MAKE_PFTO_WRAPPER(ws.end()/*ws.data() + ws.size()*/)), boost::archive::iterators::ostream_iterator(os) ); } #endif //BOOST_NO_STD_WSTRING /////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////// When I using above code instead yours, the compiler seems happy. and when i switch to ms stl ,that's ok. The original code of yours can pass when using ms-stl , but will fail with stlport. Can you explain that ? Do you think the modified code is right ? How Can I build successfully without alter your code(I like stlport and do not want to define macro BOOST_NO_STD_WSTRING to avoid compile error ) ? Thanks for your patience to read this letter! Merry Christmas!! (two days early ^_^) goodmen@x263.net 2004-12-22