Re: [Quickfix-developers] Re questing Previous Messages

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

Patrick,

Doing a SuppressFinalize on my temp store did the trick, thanks! I still
need to do some more extensive testing, but everything's looking much
healthier now.

Thanks,
Alexis





Patrick Wright-3 wrote:
> 
> QuickFIX Documentation:
> http://www.quickfixengine.org/quickfix/doc/html/index.html
> QuickFIX Support: http://www.quickfixengine.org/services.html
> 
> 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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> 
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