#include <locale>
#include <codecvt>
const rapidjson::Value &Value = Doc["Chat"];
assert(Value.IsArry());
std::string jsonString = Value[0].GetString(); //[ea][b0][80][eb] ....
std::wstring_convert<std::codecvt_utf8<wchar_t>,<wchar_t> convertString;
std::wstring wideString = convertString.from_bytes(jsonString);