Re: share data between dll's

From:

"Igor Tandetnik" <itandetnik@mvps.org>

Newsgroups:

microsoft.public.vc.language

Date:

Tue, 28 Aug 2007 14:12:40 -0400

Message-ID:

<OuQ$G8Z6HHA.5160@TK2MSFTNGP05.phx.gbl>

tasleem <tasleem@discussions.microsoft.com> wrote:

Now the problem,both 2 and 4 are needs to have common/shared data, i m
making a project as win32 dynamic DLL and placing those variables in
that dll source code here is the code.
#pragma data_seg(".SHARED_DATA")
bool m_bStartWatchThread=false;
int intvar=23;
#pragma data_seg()

This shares data between different mappings (in different processes) of
_the same_ DLL file. It is a form of interprocess communication whereby
multiple copies of the same DLL can talk to each other. It doesn't do
anything for two different DLLs, in the same or different processes.

For the latter, simply declare and export a global variable in one DLL,
and link to it in another. Or export a function that returns a pointer
to global data.
--
With best wishes,
Igor Tandetnik

With sufficient thrust, pigs fly just fine. However, this is not
necessarily a good idea. It is hard to be sure where they are going to
land, and it could be dangerous sitting under them as they fly
overhead. -- RFC 1925