Re: A question about dll

From:
"David Ching" <dc@remove-this.dcsoft.com>
Newsgroups:
microsoft.public.vc.mfc
Date:
Tue, 25 Nov 2008 07:32:11 -0800
Message-ID:
<FADB5427-4DC9-4AD9-9996-01D8F66AC456@microsoft.com>
"Tony Johansson" <t.johansson@logica.com> wrote in message
news:uaW$xxvTJHA.588@TK2MSFTNGP06.phx.gbl...

Hello!

If I put the question in this way instead.

I have four C# asp.net application running on the same computer.
These four C# asp.net application is using two dll lets call them a.dll
and b.dll
These two dll is written in MFC C++.
These two dll is built with single-threaded.
These four C# asp.net application can run at the same time so the two dll
is being used at the same time.

We assume that the MFC C++ dll is causing problem when these four C#
asp.net
applications is using the two dll at the same time.

What can I do to let four C# asp.net application to use the two MFC C++
dll
at the same time ?

I wonder about two thinks.
1. Is a solution to built the two dll with multithreaded
2. Another thought that I have is to built a static library instad of a
dll

//Tony


You can't build a static lib and use it in an ASP.NET application. Keep the
DLLs.

The simplest solution to your problem of allowing the 4 ASP.NET apps to use
the DLL's simultaneously is to ensure the ASP.NET apps each run in their own
AppDomain. I believe each AppDomain runs in its own Windows process. So if
you then have 4 AppDomains (processes) they all load the C++ DLL's
separately, and they should not interfere with each other.

If you want to create distinct COM objects, one for each ASP.NET app, there
is no other choice but to edit the C++ DLL resource containing the registry
info and change the GUID's, etc. so Windows sees separate COM objects when
you register them (even though these COM objects have exactly the same
functioinality). This is a gross hack and I don't recommend it.

-- David

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