Re: "Debug" dll in "Release" application

From:
"Igor Tandetnik" <itandetnik@mvps.org>
Newsgroups:
microsoft.public.vc.language
Date:
Tue, 12 Dec 2006 07:42:27 -0500
Message-ID:
<u$kJ2reHHHA.1044@TK2MSFTNGP02.phx.gbl>
"Tom" <Tom@discussions.microsoft.com> wrote in message
news:6BB04F96-1375-4BAF-8038-6BDB01B023B9@microsoft.com

I tried to run the project in Release configuraton, but
one dll to be compiled in Debug configuration.

The system crashes in delete of BITMAPINFO object.
This object has been created in debug dll and deleted in application
(compiled in Release)


It appears that you are allocating memory in a DLL and freeing it in the
EXE (the fact that said memory stores BITMAPINFO is irrelevant). This is
a bad design practice. Your best solution is to redesign the interface
between the EXE and the DLL so that the memory allocated in one module
is always freed in the same module.

For the kind of resource sharing you are trying to do to work, both
modules should be built against the same flavor (Debug vs Release) of
CRT DLL. If you do that, all modules share the same memory manager,
otherwise each module gets its own memory manager, and memory allocated
by one cannot be freed by the other. That's why your application
appeared to work when the CRT flavor matched between modules, but
crashed when it didn't.
--
With best wishes,
    Igor Tandetnik

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