Re: [Quickfix-users] some question on QuickFix usage

[Oren M. <or...@qu...>]

Alexey,

First of all, if you haven't found it already, the documentation is =
located here: http://www.quickfixengine.org/quickfix/doc/html/index.html =
and you can locate the examples as per this page: =
http://www.quickfixengine.org/quickfix/doc/html/examples.html

Not sure if you were unable to find the documentation at all or if you =
meant that it did not answer your questions.

1) QuickFIX only sends messages that pass validation back to the =
application.  Messages that do not pass basic validation are considered =
to dangerous to pass back since there can be a variety of issues that =
make them unstable.  What you can do is monitor for the Reject message =
that QuickFIX generates.  This message will contain the sequence number, =
message type, and specific tag (if applicable) that caused QuickFIX to =
reject this message.

2) No, only messages that pass validation make it through to the =
application.  The log will contain messages that are well formatted =
enough to make it through initial parsing.

3) Typically QuickFIX will take care of this when necessary.  You should =
not ever resend the same message yourself since there are complex =
interaction involved that identify when this is necessary.  For user =
level resend, FIX supports a special field called PossResend, which will =
allow you to send an identical message, but with a new sequence number, =
and indicate that for some reason you believe that the original may not =
have been processed.  You need to make sure that your counterparty =
supports the use of this field for the message type you are resending.

4) You can get access to the log by using the lookupSession call to get =
a pointer to a session, and the the getLog method to pull out a pointer =
to it's logger.  You cannot pull out data from the log, but you can add =
your own events there.

--oren
  ----- Original Message -----=20
  From: Alexey Zubko=20
  To: qui...@li...=20
  Sent: Thursday, December 23, 2004 10:35 AM
  Subject: [Quickfix-users] some question on QuickFix usage


  Hi All,

  =20

  I just started to use the engine (VC++). I found it pretty =
interesting, but unfortunately there is a lack of documentation and =
examples.

  I understand that open source gives much, but sometimes it's necessary =
to get results fast.

  =20

  It would be very nice to get answers for some of my questions:

  =20

    1.. Is it possible to handle some exceptions in the application =
class?=20
  For example:

  The engine rejects a message (invalid tag) but my application class =
knows nothing about this.

  =20

    2.. Is it possible to get a message (and possibly change) before =
validation in dictionary?=20
  =20

    3.. Is there an easy way to resend previous messages (on resend =
message)?=20
  =20

    4.. How can I handle/get/add mine events in log?=20
  =20

  =20

  Thank you in advance.

  =20

  =20

  Regards,

              Alexey.