Hi, Because char is singed in msvc, the ptree serialization code will truncate the value when it greater than 127. Patch for boost_1_41_0\boost\property_tree\detail\json_parser_write.hpp: 21a22,33

template<typename Ch> unsigned long to_unsigned( Ch ch ) { return static_cast<unsigned long>( ch ); } template<> inline unsigned long to_unsigned<char>( char ch ) { unsigned char* p = reinterpret_cast<unsigned char*>( &ch ); return *p; }

46c58 < unsigned long u = (std::min)(static_cast<unsigned long>(*b), 0xFFFFul); ---

unsigned long u = (std::min)(to_unsigned<Ch>(*b),

0xFFFFul); Patch for boost_1_41_0\boost\property_tree\detail\json_parser_read.hpp 141a142

template<typename CH_T>

148,149c149,150 < u = (std::min)(u, static_cast<unsigned long>((std::numeric_limits<Ch>::max)())); < c.string += Ch(u); ---

u = (std::min)(u, static_cast<unsigned

long>((std::numeric_limits<CH_T>::max)()));

c.string += CH_T(u);

152a154,165

template<> struct a_unicode<char> { context &c; a_unicode(context &c): c(c) { } void operator()(unsigned long u) const { u = (std::min)(u, static_cast<unsigned

long>((std::numeric_limits<unsigned char>::max)()));

c.string += char(u); } };

250c263 < | 'u' >> uint_parser<unsigned long, 16, 4, 4>()[typename Context::a_unicode(self.c)] ---

| 'u' >> uint_parser<unsigned long, 16, 4,

4>()[typename Context::a_unicode<Context::Ch>(self.c)] Best, Qiu Yuzhou