Re: Sharing a smart pointer between threads

From:

"Alexander Nickolov" <agnickolov@mvps.org>

Newsgroups:

microsoft.public.vc.atl

Date:

Mon, 21 Aug 2006 10:35:08 -0700

Message-ID:

<e9YomgUxGHA.4220@TK2MSFTNGP06.phx.gbl>

Unless all your threads belong th ethe MTA, you can't share
the object directly - you need proper marshaling. The perfect
solution for you would be the Global Interface Table (GIT).
It will solve your other problem as well - interface pointer
lifetime. See IGlobalInterfaceTable.

--
=====================================
Alexander Nickolov
Microsoft MVP [VC], MCSD
email: agnickolov@mvps.org
MVP VC FAQ: http://www.mvps.org/vcfaq
=====================================

"PaulH" <paul.heil@gmail.com> wrote in message
news:1156180232.519258.89350@74g2000cwt.googlegroups.com...

I have a COM object smart pointer I'd like to share between threads (as
in the code below). The object works great in the thread it was created
in, but I get an exception when I use it in the thread I'm sending it
to.

How can I successfully share this COM object smart pointer?

Thanks,
PaulH

MyLib::IInterfacePtr m_Obj;
CMyApp::OnTimer()
{
   m_dialog->PostMessage(MYWM_UPDATE,
reinterpret_cast<WPARAM>(&m_Obj));
}

CMyDlg::OnUpdateMsg(WPARAM wParam, LPARAM /*lParam*/)
{
   MyLib::IInterfacePtr pObj = *reinterpret_cast<MyLib::IInterfacePtr
*>(wParam);
   pObj->DoSomething(); //exception here
   //...
}