Re: [Quickfix-developers] Howto specify explicitly order of custom fields?

[JohnG <jo...@pu...>]

I am having the same difficulty with the order of custom header fields. I a=
m
unable to add EMX field 9426 to the header in the right order. Did you find
a solution to this problem ?

Thanks, John


Oren Miller wrote:
>=20
> QuickFIX Documentation:
> http://www.quickfixengine.org/quickfix/doc/html/index.html
> QuickFIX FAQ: http://www.quickfixengine.org/wikifix/index.php?QuickFixFAQ
> QuickFIX Support: http://www.quickfixengine.org/services.html
>=20
> Well, if you dig down into the C++ layer, in the FieldMap class, you =20
> will notice that a FieldMap constructor takes a message_order =20
> object.  Now, if you look in MessageSorters.h, you will find the =20
> message_order object which has 4 modes.
>=20
> header: Makes sure that the BeginString, BodyLength, and MsgType are =20
> the first three fields.  Everything else in ascending numerical order.
>=20
> trailer: Makes sure the CheckSum field is last.  Everything else in =20
> ascending numerical order.
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> normal: Sorted in ascending numerical order, used for message body's
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> group: Sorted in the order based on provided list.
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> Why is it like this?  Well sorting things in ascending order is just =20
> the simplest fastest way to sort fields and complies with the spec.  =20
> The group order was introduced because the spec explicitly states =20
> that repeating groups must be in a specific order.
>=20
> Basically to accomplish what you need would require some new =20
> functionality.  I think it would require the implementation of a data =20
> dictionary sorting mode.
>=20
> --oren
>=20
> On Jul 15, 2005, at 11:27 AM, Joerg Thoennes wrote:
>=20
>> Hi Oren,
>>
>>
>>> Which fields need to be ordered?  The custom tags in the header =20
>>> and  the trailer?  The entire message?
>>>
>>
>> To be more precise: EMX adds extra custom fields to both the header =20
>> and trailer, and of course to the body.
>>
>> We generated the new QF classes using the XML scripts, but the =20
>> order seems to be different from what EMX expects.
>>
>> So our questions is:
>>
>> How can we control the order of tags in
>>
>> (a) header
>> (b) body
>> (c) trailer
>>
>> My guess is that the DD order controls at least the body order, but =20
>> I am not sure about header and trailer. After some digging of the =20
>> source code some advise from you would be very helpful.
>>
>> Thanks, J=C3=B6rg
>>
>> --=20
>> Joerg Thoennes
>>                                http://macd.com
>> Tel.: +49 (0)241 44597-24      Macdonald Associates GmbH
>> Fax : +49 (0)241 44597-10      Lothringer Str. 52, D-52070 Aachen
>>
>>
>=20
>=20
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