环境：VS2010SP1、boost 1.55

strVal = boost::lexical_cast<std::string>(jsonVal.asDouble());

上面语句转成的浮点会有变化，得用下面的语句代替

	try
			{
				Json::Value jsonVal = record[key.c_str()];

				std::string strVal;
				if (jsonVal.isString())
				{
					strVal = jsonVal.asString();
				} else if (jsonVal.isBool())
				{
					strVal = jsonVal.asBool()==true?"true":"false";
				} else if (jsonVal.isDouble())
				{
					char szBuf[MAX_PATH] = {0};
					sprintf(szBuf,"%lf",jsonVal.asDouble());
					strVal = szBuf;
				} else if (jsonVal.isInt())
				{
					strVal = boost::lexical_cast<std::string>(jsonVal.asInt());
				} else if (jsonVal.isUInt())
				{
					strVal = boost::lexical_cast<std::string>(jsonVal.asUInt());
				}
				mapRec[key.c_str()]=strVal;
			}
			catch(boost::bad_lexical_cast &e)
			{
			}

再测试，问题解决。猜测是boost::Lexical_cast的问题。