Crash in Release Build for NT only

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 [email protected]
| Senior Software Engineer
| Infinity Information Systems www.i2sys.com

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