Re: How to export a static object from a DLL

From:

"Ben Voigt [C++ MVP]" <rbv@nospam.nospam>

Newsgroups:

microsoft.public.vc.language

Date:

Mon, 23 Mar 2009 16:41:31 -0500

Message-ID:

<u3GfiAArJHA.3792@TK2MSFTNGP06.phx.gbl>

"dbtouch" <dbtouch@gmail.com> wrote in message
news:cc48a39f-6c1f-42c7-b7b4-f5eaf5c716ad@v15g2000yqn.googlegroups.com...

Hi, Cezary

Besides that the code is not compilable, I assume that you are trying to
export (transfer) ,,factory'' object from EXE to DLL. Loosely speaking,
it is not a good idea.

That is what I want do: export factory to DLL

Why are you exporting ,,create'', if you are directly referring to it in
,,Circle.cpp'' only?

I want to make multiple dlls to reference factory defined in the
loader. Can export factory from EXE?

Definitely. But don't export the singleton object. Export one global
function that returns an interface pointer to the object factory (usually
via an output parameter so the return value can indicate errors). All
access from outside the module should be done only using pure interfaces, so
that your application can be extended with DLLs compiled with different
compiler versions and settings.

Thanks

dbtouch