{{Quickfixn}} Question about GetGroup

[Logan Moore]

Hi Stan,

I'm having the same problem with QuickFix.FIX42.MarketDataIncrementalRefresh.NoMDEntriesGroup

Looking over the code now, I think the solution is to either add a whole bunch of implicit conversion operators to the base Group class, or a constructor to each of the derived classes that accepts the base class as a parameter. The constructor route seems safer/easier because you can't use it out of context unknowingly.

Logan

From: quickfixn-bounces at lists.quickfixn.com [mailto:quickfixn-bounces at lists..quickfixn.com] On Behalf Of S Tan
Sent: Monday, 9 April 2012 9:30 p.m.
To: quickfixn at lists.quickfixn.com
Subject: {{Quickfixn}} Question about GetGroup

Hi there,

At the bottom of http://quickfixn.org/tutorial/repeating-groups, we see this code
var noSidesGrp = new QuickFix.FIX44.TradeCaptureReport.NoSidesGroup();
for(int grpIndex = 1; grpIndex<= message.GetInt(Tags.NoSides); grpIndex += 1)
{
   noSidesGrp = message.GetGroup(grpIndex, Tags.NoSides);
}

This won't compile in VS2010 as noSidesGrp has type QuickFix.FIX44.TradeCaptureReport.NoSidesGroup but message.GetGroup returns the base class Group.

Is there any way we can call GetGroup and obtain the correct subclass of Group based on the input tags? I've looked into the UnitTests and they mostly test the base class Group.

I think in QuickFix/C++ we can call message.GetGroup(grpIndex, noSidesGrp) so that GetGroup gets the type information. Perhaps not quite idiomatic C#.

stan



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