场景

         在VS下使用JsonCpp把中文赋值给Json::Value后toStyledString()打印，中文字已经变成\u开始的字符，而且还是不准确的unicode码,在Linux环境下没有这个问题。中文乱码显示如下: "VehicleBrand" : "\u5927\u4f17"

解决方案

 打开jsoncpp源码jsoncpp.cpp文件，找到valueToQuotedStringN函数修改如下：

static JSONCPP_STRING valueToQuotedStringN(const char* value, unsigned length) {
  if (value == NULL)
    return "";
  if (!isAnyCharRequiredQuoting(value, length))
    return JSONCPP_STRING("\"") + value + "\"";
  // We have to walk value and escape any special characters.
  // Appending to JSONCPP_STRING is not efficient, but this should be rare.
  // (Note: forward slashes are *not* rare, but I am not escaping them.)
  JSONCPP_STRING::size_type maxsize = length * 2 + 3; // allescaped+quotes+NULL
  JSONCPP_STRING result;
  result.reserve(maxsize); // to avoid lots of mallocs
  result += "\"";
  char const* end = value + length;
  for (const char* c = value; c != end; ++c) {
    switch (*c) {
    case '\"':
      result += "\\\"";
      break;
    case '\\':
      result += "\\\\";
      break;
    case '\b':
      result += "\\b";
      break;
    case '\f':
      result += "\\f";
      break;
    case '\n':
      result += "\\n";
      break;
    case '\r':
      result += "\\r";
      break;
    case '\t':
      result += "\\t";
      break;
    // case '/':
    // Even though \/ is considered a legal escape in JSON, a bare
    // slash is also legal, so I see no reason to escape it.
    // (I hope I am not misunderstanding something.)
    // blep notes: actually escaping \/ may be useful in javascript to avoid </
    // sequence.
    // Should add a flag to allow this compatibility mode and prevent this
    // sequence from occurring.
    default: 
    {
        /*
      unsigned int cp = utf8ToCodepoint(c, end);
      // don't escape non-control characters
      // (short escape sequence are applied above)
      if (cp < 0x80 && cp >= 0x20)
        result += static_cast<char>(cp);
      else if (cp < 0x10000) { // codepoint is in Basic Multilingual Plane
        result += "\\u";
        result += toHex16Bit(cp);
      } else { // codepoint is not in Basic Multilingual Plane
               // convert to surrogate pair first
        cp -= 0x10000;
        result += "\\u";
        result += toHex16Bit((cp >> 10) + 0xD800);
        result += "\\u";
        result += toHex16Bit((cp & 0x3FF) + 0xDC00);
      }
        */
        result += *c;
    } break;
    }
  }
  result += "\"";
  return result;
}

修改default分支的代码

通过代码可以明白的看到default:里面处理的就是包括中文在内的字符