[Quickfix-developers] Simple beginner questions

[<ja...@sk...>]

Hi,

Currently I'm trying to obtain the market value of a symbol from a reply 
message from a server, however, I'm not sure on how to obtain the value 
in field 270(MDEntryPx).

void Application::onMessage
(const FIX42::MarketDataSnapshotFullRefresh& message, const 
FIX::SessionID&) {
FIX::NoMDEntries noMDEntries;
message.get(noMDEntries); // incomplete type is not allowed
}

when I typed in the above code in my application.cpp, I could not 
compile due to the error commented.


void Application::fromApp(const FIX::Message& message, const 
FIX::SessionID& sessionID)
throw(FIX::FieldNotFound, FIX::IncorrectDataFormat, 
FIX::IncorrectTagValue, FIX::UnsupportedMessageType)
{
crack(message, sessionID);
std::cout << std::endl << "IN: " << message << std::endl;
FIX::MsgType msgType;
message.getHeader().getField(msgType);
if (msgType.getValue() == "W"){
std::string value = message.getHeader().getField(270); //MDEntryPx
mkval = std::stod(value); //mkval is a double
}
}

when I used the above code, I could compile and run, but when it reached 
the line         std::string value = message.getHeader().getField(270);
I received an toApp message with 58=Conditionally Required Field Missing 
<270>

May I know what I can change in order to be able to store the symbol 
price into a double object?