Re: [Quickfix-developers] .Net: Cloning QuickFix.Message

[<reg...@ho...>]

Brian,

The class I am trying to cast is a derived NewOrderSingle. It's indeed
embedded in a switch statement but for the sake of the example I only
reduced the code to the minimum.

as a matter of fact in the fromApp() Method:

"Message msg = message as NewOrderSingle"

works.
However:

Message msg = new Message(message.ToString())
NewOrderSingle order = msg as NewOrderSingle

don't

I wish I could to NewOrderSingle order = new
NewOrderSingle(message.ToString())

but this is not implemented. Any idea how I can sort the problem out?

On Tue, 29 Sep 2009 11:21:10 -0700 (PDT), Brian Erst
<azz...@ya...> wrote:
> It looks like it's because you're instantiating a base class (Message)
and
> trying to cast it to a derived class (NewOrderSingle).
> 
> As far as I can tell, Message doesn't define a clone method, so you'd
> probably have to figure out the message type first, then use the copy
> constructor for the derived class, e.g.
> 
> Message newMsg;
> if (msg instanceof NewOrderSingle)
> {
>     newMsg = new NewOrderSingle(msg);  // NewOrderSingle's copy
> constructor for NOS and Message are identical
> } ... etc...
> 
> Obviously, if you had a bunch of different messages you wanted to clone,
> you'd be better off building a switch statement off the MsgType of the
> message.
> 
> - Brian Erst
> Thynk Software, Inc.
> 
> 
> 
> 
> ________________________________
> From: "reg...@ho..." <reg...@ho...>
> To: qui...@li...
> Sent: Tuesday, September 29, 2009 11:46:48 AM
> Subject: [Quickfix-developers] .Net: Cloning QuickFix.Message
> 
> QuickFIX Documentation:
> http://www.quickfixengine.org/quickfix/doc/html/index.html
> QuickFIX Support: http://www.quickfixengine.org/services.html
> 
> 
> Hi,
> 
> I'd like to clone FIX Messages. I have tried
> fromApp(Message msg)
> {
> Message newMsg = new Message(msg.ToString);
> }
> 
> which seems to work fine.
> Unfortunately it is thenimpossible to cast newMsg in any FIX subtypes!
> e.g
> 
> NewOrderSingle order = newMsg as NewOrderSingle;
> 
> does not work anymore. (even though newMsg is indeed a NewOrderSingle
> 35=D)
> 
> Any idea why?
> 
> Thanks,
> 
> Regis
> 
> 
>
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