Re: Problem with DLL, static LIB and static data

From:

"Bruno van Dooren" <bruno_nos_pam_van_dooren@hotmail.com>

Newsgroups:

microsoft.public.vc.language

Date:

Wed, 9 May 2007 12:30:33 +0200

Message-ID:

<#ucmUUikHHA.2552@TK2MSFTNGP06.phx.gbl>

- MSVC6 (yes, I know...)
- a static lib containg a class (TheClass) with a static member (pointer)
  and a function with static data (static int n;)
- a DLL that uses the static lib above; it contains an exported function
  that gets a point to an object of the class defined in the static lib
  and calls the lib function containing the 'static int n'
- an executable that uses both the static lib and and the DLL;
  it creates an 'TheClass' object an passes it to the function in the DLL
  and calls the function in the lib

All static data (static member in TheClass and static variable in the
exported
function) get correctly initialized in the EXE but when accessed in the
DLL it's
0 again !

(I have a test project that I coud zip together if anyone is
interested...)

remember that if you link both the exe and the dll against the static lib,
both will have their own copy of the static object in the static lib.
Maybe this could be the problem.

--
Kind regards,
    Bruno van Dooren MVP - VC++
    http://msmvps.com/blogs/vanDooren
    bruno_nos_pam_van_dooren@hotmail.com