在c++里boost:ptree 用作生成json，中文乱码如何解决？
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在stack OverFlow 找到答案，贴过来：
I found some solutions. In general you needs to specify boost::property_tree::json_parser::create_escapes template for [Ch=Char], to provide your "special occasion bug free escaping".
JSON standard assume that all string are UTF-16 encoded with "\uXXXX" escaping, but some library support UTF-8 encoding with "\xXX" escaping. If JSON file can be encoded in UTF-8, you may pass all character higher than 0x7F, witch was intended for original function.
I put this code before using boost::property_tree::json_parser::write_json. It comes from boost_1_49_0/boost/property_tree/detail/json_parser_write.hpp:
namespace boost { namespace property_tree { namespace json_parser { // Create necessary escape sequences from illegal characters template<> std::basic_string<char> create_escapes(const std::basic_string<char> &s) { std::basic_string<char> result; std::basic_string<char>::const_iterator b = s.begin(); std::basic_string<char>::const_iterator e = s.end(); while (b != e) { // This assumes an ASCII superset. But so does everything in PTree. // We escape everything outside ASCII, because this code can't // handle high unicode characters. if (*b == 0x20 || *b == 0x21 || (*b >= 0x23 && *b <= 0x2E) || (*b >= 0x30 && *b <= 0x5B) || (*b >= 0x5D && *b <= 0xFF) //it fails here because char are signed || (*b >= -0x80 && *b < 0 ) ) // this will pass UTF-8 signed chars result += *b; else if (*b == char('\b')) result += char('\\'), result += char('b'); else if (*b == char('\f')) result += char('\\'), result += char('f'); else if (*b == char('\n')) result += char('\\'), result += char('n'); else if (*b == char('\r')) result += char('\\'), result += char('r'); else if (*b == char('/')) result += char('\\'), result += char('/'); else if (*b == char('"')) result += char('\\'), result += char('"'); else if (*b == char('\\')) result += char('\\'), result += char('\\'); else { const char *hexdigits = "0123456789ABCDEF"; typedef make_unsigned<char>::type UCh; unsigned long u = (std::min)(static_cast<unsigned long>( static_cast<UCh>(*b)), 0xFFFFul); int d1 = u / 4096; u -= d1 * 4096; int d2 = u / 256; u -= d2 * 256; int d3 = u / 16; u -= d3 * 16; int d4 = u; result += char('\\'); result += char('u'); result += char(hexdigits[d1]); result += char(hexdigits[d2]); result += char(hexdigits[d3]); result += char(hexdigits[d4]); } ++b; } return result; } } } }
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我也遇到同样问题，问题解决了。
QQ504112619，如果楼主还没解决可以Q我
@世界的意识: windows端用 wptree可解决，但是linux端解决方案不可行。你是咋解决的呢？谢谢
