Re: [Quickfix-developers] "Cannot pass a GCHandle across AppDomains"

[Diego F. <die...@gm...>]

Scott,

Why do you need to pass a GCHandle across AppDomains?

Diego Frata
die...@gm...


On Mon, Jun 21, 2010 at 1:59 PM, Scott Kathrein
<sc...@la...>wrote:

> QuickFIX Documentation:
> http://www.quickfixengine.org/quickfix/doc/html/index.html
> QuickFIX Support: http://www.quickfixengine.org/services.html
>
>
> So here's the issue: I'm trying to create a COM object for use in Excel,
> and I'm using the quickfix .NET wrapper API from version 1.13.3. I'm
> compiling the quickfix library from source, but I have not made any changes
> to it.
>
> Most the time everything works fine, but when I do an "initiator.start()",
> at some point subsequently the Log class gets invoked to send out
> "Connecting to x on port x", and I receive a "Cannot pass a GCHandle across
> AppDomains" exception that occurs when the onEvent method of the Log class
> is (attempted to be) accessed.
>
> If this is what it looks like, then the solution is very complicated and
> uses delegates, and possibly a total rewrite of the .NET wrapper:
> http://lambert.geek.nz/2007/05/29/unmanaged-appdomain-callback/
>
> This appears to be a long standing problem with Quickfix. I've found a
> number of people receiving this exception.
> For example, here:
> http://article.gmane.org/gmane.comp.finance.quickfix.user/1362 (2009, has
> workaround)
> or here: http://osdir.com/ml/finance.quickfix.user/2006-10/msg00019.html (from
> 2006, says he contacted another user wit the same problem who had to develop
> his own fix implementation)
>
> Right now I can't directly search the mailing list (any search I do returns
> no results), so I guess my questions are this:
>
> Is this still a known problem with Quickfix and appdomains? Is the only
> real workaround to ensure that all of quickfix runs in one appdomain?
>
> If so, I'll have to look into doing that, or considering whether this
> project should be abandoned. It's not clear to me if it's possible to always
> ensure something is running in one appdomain, and I'd rather not invest a
> lot of time into this and have it run buggy.
>
> Scott
>
>
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