Re: [Quickfix-developers] Re questing Previous Messages

[Patrick W. <pw...@ka...>]

I don't have your exact error but I remember there was a problem holding a reference to the message store.

This is my code similar to yours:
var list = new ArrayList();
_messageStore.refresh();
_messageStore.get(seqNum.getValue(), seqNum.getValue() + 1, list);
if (list.Count == 1)
{
    try
    {
        var refMessage = new Message((string) (list[0]));
        if (refMessage is NewOrderSingle)
        ....

Where _messageStore is a class variable:
protected MessageStore _messageStore;

What I found was that this object would now be disposed twice when the class was destroyed so I had to put in this code:
        public virtual void Shutdown()
        {
            //Must call this or else messagestore is double-deleted in cpp
            if (_messageStore != null)
            {
                GC.SuppressFinalize(_messageStore);
                _messageStore = null;
            }
        }


Like I said, not exactly the same as your problem but maybe a bit similar.

Maybe you could try suppress finalize on your temp message store variable??

Patrick


-----Original Message-----
From: qui...@li... [mailto:qui...@li...] On Behalf Of Alexis Michaelides
Sent: Friday, 15 August 2008 10:33 AM
To: qui...@li...
Subject: Re: [Quickfix-developers] Re questing Previous Messages

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


Karl,
(and anybody else who's listening!)

Have you managed to figure this one out?

I'm having the same issue when accessing the MessageStore from within a call
to fromAdmin().

When I receive a message in fromAdmin(), I look at the MsgType and if it's a
SessionReject (3), I'm attempting to look up the original message so I can
perform further processing on it (e.g. if it was a new order message, create
an order rejected and send back to the OMS etc).

This is throwing a "Runtime Error! R6025 - pure virtual function call"
without fail! However it appears that my MessageStore.get() call returned
successfully - it seems the error happens asynchronously to my calling that
method.

I'm also using the C# wrapper, with a ThreadedSocketInitiator handling
multiple sessions.

Thanks!
Alexis



Karl Schulze-3 wrote:
>
> QuickFIX Documentation:
> http://www.quickfixengine.org/quickfix/doc/html/index.html
> QuickFIX Support: http://www.quickfixengine.org/services.html
>
>
> I am trying to use the store attached to a particular session in order to
> request historical messages by the sequence number. I am running the C#
> wrapper to quickfix and am requesting the previous message with the
> following code:
>
> int seqNum = (int)lvFixMessages.SelectedItems[0].Tag;
> ArrayList msgList = new ArrayList();
> FixApplication.Session.getStore().get(seqNum, seqNum, msgList);
> if(msgList.Count > 0)
> {
>     QuickFix.Message msg = new Message((string)msgList[0]);
> }
>
> I may be running into a multi-threaded issue here, as this is called from
> the user interface thread, but I was hoping that read operations were
> threadsafe.
>
> The problem is characterisitic of multi-threading issues, sometimes it
> works
> just fine. Other times I get an AccessViolationException "Attempted to
> read
> or write protected memory. This is often an indication that other memory
> is
> corrupt."
>
> Or sometimes I also get "Runtime Error! R6025 - pure virtual function
> call"
>
> Please let me know if there is a threadsafe way to access the filestore. I
> am using a filestore and a single initiator, with a standard Application.
>
> Thanks,
>
> -Karl
>
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