RE: [Quickfix-developers] .NET & COM threading models

[John D. <joh...@ch...>]

Oren,

Thanks for the reply. I substituted in libxml2 in place of MSXML, but ran
into a problem when I tried to parse the FIX 4.2 message definition file.
Specifically, in this code:

bool LIBXML_DOMDocument::load( const std::string& url )
  { QF_STACK_PUSH(LIBXML_DOMAttributes::lead)
    try
    {
      m_pDoc = xmlParseFile(url.c_str());
      return m_pDoc != NULL;
    }
    catch( ... ) { return false; }

    QF_STACK_POP
  }

xmlParseFile() throws. It seems to be crashing somewhere, but I downloaded
the libxml binaries, not the source code, so I am not seeing exactly where
it's having a problem. I tried reducing the XML file in case there was a
problem tag somewhere inside of it (even though MSXML parsed it without
issue), but this did not help.

This may be a question that is more germane to libxml than to QuickFix, but
I was hoping someone had come across this in the past.

Thanks,
John

-----Original Message-----
From: QuickFIX [mailto:or...@qu...] 
Sent: Tuesday, April 13, 2004 5:52 PM
To: John Debay
Cc: qui...@li...
Subject: [Quickfix-developers] .NET & COM threading models

John,

If you are unable to resolve this with MSXML, QuickFIX also supports  
libxml2, which is open source and also has a windows binary  
distribution.  See the installation instructions for how to tell  
QuickFIX to build against libxml in place of MSXML3:   
http://quickfix.sourceforge.net/quickfix/doc/html/ 
install.html#Windows%20(C++)

--oren

On Apr 13, 2004, at 4:36 PM, John Debay wrote:

> Hi,
>
> I'm trying to use QuickFix 1.7.0 within a server hosted on .NET  
> Remoting.
> I'm running into some incompatibilities between the COM threading model
> Remoting sets up and QuickFix, which uses an STA model. Specifically,  
> within
> the function MSXML_DOMDocument::MSXML_DOMDocument(), the line:
>
> if(FAILED(CoInitialize(NULL)))
>     throw ConfigError("Could not initialize COM");
>
> throws an exception. The reason is that CoInitialize() "initializes  
> the COM
> library on the current thread and identifies the concurrency model as
> single-thread apartment (STA)," to quote the documentation. Before  
> this code
> is run, the .NET runtime has already set the current thread to run  
> within an
> MTA model.
>
> I believe I have a fix in place by replacing CoInitialize with
> CoInitializeEx and setting dwCoInit to COINIT_MULTITHREADED, but won't  
> be
> sure until I have an opportunity to thoroughly test tomorrow. In the
> meantime I was hoping for a little guidance.
>
> Has anyone had any experience mixing COM threading models with  
> QuickFix? Is
> there a different XML library I can use besides MSXML? What does the  
> *nix
> implementation use?
>
> Thanks in advance.
>
> John
>
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