Crash in Release Build for NT only

[RBernabe]

Hi All,

Win 95, NT4.0 Visual C++ 5.0

I have an app that has two threads running. The main thread and the socket worker thread. The app is the client in our client-server software.
The strange thing is that when we run the release build under NT4.0 it crashes with the following error :

Unhandled exception at Iviewer.exe (MFC42.dll):0xC0000005:Access Violation

The breakpoint is within the following function:

LRESULT AFXAPI AfxCallWndProc(CWnd* pWnd, HWND hWnd, UINT nMsg,
WPARAM wParam = 0, LPARAM lParam = 0)
{
_AFX_THREAD_STATE* pThreadState = _afxThreadState.GetData();
MSG oldState = pThreadState->m_lastSentMsg; // save for nesting
pThreadState->m_lastSentMsg.hwnd = hWnd;
pThreadState->m_lastSentMsg.message = nMsg;
pThreadState->m_lastSentMsg.wParam = wParam;
pThreadState->m_lastSentMsg.lParam = lParam;

#ifdef _DEBUG
if (afxTraceFlags & traceWinMsg)
_AfxTraceMsg(_T("WndProc"), &pThreadState->m_lastSentMsg);
#endif

// Catch exceptions thrown outside the scope of a callback
// in debug builds and warn the user.
LRESULT lResult;
TRY
{
#ifndef _AFX_NO_OCC_SUPPORT
// special case for WM_DESTROY
if ((nMsg == WM_DESTROY) && (pWnd->m_pCtrlCont != NULL))
pWnd->m_pCtrlCont->OnUIActivate(NULL);
#endif

// special case for WM_INITDIALOG
CRect rectOld;
DWORD dwStyle;
if (nMsg == WM_INITDIALOG)
_AfxPreInitDialog(pWnd, &rectOld, &dwStyle);

// delegate to object's WindowProc
lResult = pWnd->WindowProc(nMsg, wParam, lParam);

// more special case for WM_INITDIALOG
if (nMsg == WM_INITDIALOG)
_AfxPostInitDialog(pWnd, rectOld, dwStyle);
}
CATCH_ALL(e)
{
lResult = AfxGetThread()->ProcessWndProcException(e, &pThreadState->m_lastSentMsg);
TRACE1("Warning: Uncaught exception in WindowProc (returning %ld).\n",
lResult);
DELETE_EXCEPTION(e);
}
END_CATCH_ALL

pThreadState->m_lastSentMsg = oldState;
return lResult;
}

This is the value of oldState according to MsDev :

oldState {msg=0x00000000 wp=0x00000000 lp=0x00000000}


Thanks in advance!

BTW I am currently trying to find a clue in the MSDN Library. Currently trying to understand the :

C++ Q & A
Paul DiLascia



( a search for AfxCallWndProx only produced two results)

_________________________________________
| Robert M. Bernabe rbernabe@i2sys.com
| Senior Software Engineer
| Infinity Information Systems www.i2sys.com

[Mark Veldt]

Did you try to set optimizations off?

Because global variables are not updated when not set to virtual, when it is on.

Mark

Hi Mark,

Thanks for the reply. Yes I did...same thing happened. I forgot to mention that the app runs fine...until you close it. The app is the client in a client-server platform. The server can instantiate multiple frame windows through a proprietary script. When I close any of the main (some windows are, this is set through script) window it should close the app. This is when the problem occurs

RBernabe...Obet