关于jsoncpp读取浮点数类型字段

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。