[Quickfix-developers] .NET & COM threading models

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

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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