Re: SaveBarState Fails when it is called from a thread

From:

"Tom Serface" <tserface@msn.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Wed, 9 Jul 2008 12:12:55 -0700

Message-ID:

<#6ulLff4IHA.5112@TK2MSFTNGP05.phx.gbl>

Hi Joe,

OP must have had something else going on (I think it was unintentional)
since some of the "copies" came after I responded. Sometimes, rarely, but
sometimes, these newgroup readers go crazy on us :o)

Tom

"Joseph M. Newcomer" <newcomer@flounder.com> wrote in message
news:o4g974147fo4m2v41lmo2b959kdbvhs38l@4ax.com...

I counted seven copies of this post. Generally, one copy is sufficient.
You have to
allow time for your request to propagate through the servers; it is not an
instantaneous
update. Please post a question only once.
joe

On Wed, 9 Jul 2008 05:45:21 -0700 (PDT), Faisal <faisalm83@gmail.com>
wrote:

Hi,

In my application, I use SaveBarState() for persisting control bar
state.
The code fragment is something like this.

void CMainFrame::OnSavePersistance()
{
SaveBarState(_T("My Persistence"));
// Saves some information to an xml file
}

Since my xml saving takes some time I changed the code to execute in a
thread

UINT ThreadFn(LPVOID pParam)
{
CMainFrame* pThis = (CMainFrame*)pParam;
pThis->SaveBarState(_T("My Persistence"));

return 0;
}

void CMainFrame::OnCntrlbartst()
{
AfxBeginThread( ThreadFn, this );
}

But, now in the thread function SaveBarState() fails. It shows some
assertion in debug version. I think it is due to some mismatch in
MODULE_STATE.

statck trace for assert
CWnd::AssertValid() line 879 + 25 bytes
CControlBar::AssertValid() line 976
CStatusBar::AssertValid() line 732
AfxAssertValidObject(const CObject * 0x00431510 {CStatusBar
hWnd=0x00180c7e}, const char * 0x5f4ccfe8 THIS_FILE, int 531) line 108
CControlBar::GetBarInfo(CControlBarInfo * 0x00433d70) line 534
CFrameWnd::GetDockState(CDockState & {CDockState}) line 520
CFrameWnd::SaveBarState(const char * 0x0041844c `string') line 443
ThreadFn(void * 0x00431450) line 174

How can I avoid this problem?

Joseph M. Newcomer [MVP]
email: newcomer@flounder.com
Web: http://www.flounder.com
MVP Tips: http://www.flounder.com/mvp_tips.htm