Re: [Quickfix-developers] Field name to number conversion - more info

[Alexis M. <ale...@ya...>]

George,
I'm doing something similar in C# - not sure if it applies to what you're trying to do, but I read in field names from my config and create a Dictionary<string, int> object from that which I can use to map to a field ID. I use Reflection to achieve this. My C# code looks like:
intnameID = (int)(System.Reflection.Assembly.LoadFrom("quickfix_net.dll").GetType("QuickFix." + fieldName).GetField("FIELD").GetValue(0));
(where "fieldName" contains the field, e.g. "OrderQty" I'm looking up at the time. 
Not sure if this helps, but hopefully it will point you in the right direction!
Alexis


----- Original Message ----
From: George Hrysanthopoulos <ge...@so...>
To: qui...@li...
Sent: Friday, August 15, 2008 5:28:20 PM
Subject: Re: [Quickfix-developers] Field name to number conversion - more info

QuickFIX Documentation: http://www.quickfixengine.org/quickfix/doc/html/index.html
QuickFIX Support: http://www.quickfixengine.org/services.html

Hello again everyone,

Here is some more info on what I am trying to do:

Let's say I have a file called: fixfields.cfg


In the file I have:

OrderQty
Symbol
Price
ClOrdID
Side

Currently, from: "Application::onMessage" function, I do:

    FIX::Symbol symbol;
    FIX::Side side;
    FIX::OrderQty orderQty;
    FIX::Price price;
    FIX::ClOrdID clOrdID;

    ...
    ...

    message.get( symbol );
    message.get( side );
    message.get( orderQty );
    message.get( price );
    message.get( clOrdID );

I am sure you recognize this as the sample executor application.

What I want to do is:

message.get( "symbol_1_from_file" );
message.get( "symbol_2_from_file" );
message.get( "symbol_3_from_file" );
...

...


You see, what I want to do is "message.get" for the fields I read in from the config file.
This way the fields are not hard coded in the app.

The question is, is there a way to get the field, as a string, and then find the appropriate enum?

I hope this makes more sense.

Also, and this is a big one, I am a "C" programmer. I am relatively new to "C++". So, please bear with me.

-George


On Aug 14, 2008, at 5:34 PM, George Hrysanthopoulos wrote:

QuickFIX Documentation: http://www.quickfixengine.org/quickfix/doc/html/index.html
QuickFIX Support: http://www.quickfixengine.org/services.html

Hello everyone,

During runtime I want to read a file, with field names, and when a  
deal comes in, just print to screen
the fields I am interested in (for starters).

However, I see that the field names are enum'ed from file:  
FieldNumbers.h

How do I generate a field number from a string? Is there a built-in  
way of doing this
or do I have to (somehow) keep a copy of "FieldNumbers.h" in my  
executable?

Or, worst case, keep the fields I am interested in as numbers in the  
setup file?
This is not at all user friendly and I would like to avoid that.

-G

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