Re: CFileDialog::DoModal() never returns

I am encountering a wierd error, and I can't figure out which way to turn.
Something deep within the call tree of CFileDialog::DoModal() is
(apparently)
failing, causing the dialog to never be displayed, and the f() never to
return. Here's the failing code:

void CPvtDlg::OnBnClickedBnFileBd()
{

   // specify a file
   CFileDialog fileOpenBox ( TRUE,
// BOOL bOpenFileDialog
                               NULL,
// LPCTSTR lpszDefExt
                               NULL,
// LPCTSTR lpszFileName
                               (OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT),
// DWORD dwFlags
                               NULL, // LPCTSTR lpszFilter
                               NULL );
// CWnd* pParentWnd

   // extract file name
   if( IDOK == fileOpenBox.DoModal() )
   {
       m_strFileNameBd = fileOpenBox.GetFileName();
       m_strPathNameBd = fileOpenBox.GetPathName();
   }
...

Single stepping, I am unable to step over the DoModal() call. Stepping
into
the call to DoModal(), I find myself inside dlgfile.cpp:

INT_PTR CFileDialog::DoModal()
{
ASSERT_VALID(this);
ASSERT(m_ofn.Flags & OFN_ENABLEHOOK);
ASSERT(m_ofn.lpfnHook != NULL); // can still be a user hook

// zero out the file buffer for consistent parsing later
ASSERT(AfxIsValidAddress(m_ofn.lpstrFile, m_ofn.nMaxFile));
DWORD nOffset = lstrlen(m_ofn.lpstrFile)+1;
ASSERT(nOffset <= m_ofn.nMaxFile);
memset(m_ofn.lpstrFile+nOffset, 0,
(m_ofn.nMaxFile-nOffset)*sizeof(TCHAR));

// This is a special case for the file open/save dialog,
// which sometimes pumps while it is coming up but before it has
// disabled the main window.
HWND hWndFocus = ::GetFocus();
BOOL bEnableParent = FALSE;
m_ofn.hwndOwner = PreModal();
AfxUnhookWindowCreate();
if (m_ofn.hwndOwner != NULL && ::IsWindowEnabled(m_ofn.hwndOwner))
{
bEnableParent = TRUE;
::EnableWindow(m_ofn.hwndOwner, FALSE);
}

_AFX_THREAD_STATE* pThreadState = AfxGetThreadState();
ASSERT(pThreadState->m_pAlternateWndInit == NULL);

if (m_ofn.Flags & OFN_EXPLORER)
pThreadState->m_pAlternateWndInit = this;
else
AfxHookWindowCreate(this);

INT_PTR nResult;
if (m_bOpenFileDialog)
nResult = ::AfxCtxGetOpenFileName(&m_ofn);
else
nResult = ::AfxCtxGetSaveFileName(&m_ofn);
...
I am unable to step over the call to ::AfxCtxGetOpenFileName(&m_ofn); in
the
if branch above. Stepping into it allows me to step through

OPENFILENAME& CFileDialog::GetOFN()
{
return *m_pOFN;
}

and

COMMDLG_AFXCTXFUNC(BOOL,GetOpenFileNameW,(LPOPENFILENAMEW
unnamed1),(unnamed1))

to

AFX_MODULE_STATE* AFXAPI AfxGetModuleState()
{
_AFX_THREAD_STATE* pState = _afxThreadState;
ENSURE(pState);
AFX_MODULE_STATE* pResult;
if (pState->m_pModuleState != NULL)
{
// thread state's module state serves as override
pResult = pState->m_pModuleState;
}
else
{
// otherwise, use global app state
pResult = _afxBaseModuleState.GetData();
}
ENSURE(pResult != NULL);
return pResult;
}

back through

COMMDLG_AFXCTXFUNC(BOOL,GetOpenFileNameW,(LPOPENFILENAMEW
unnamed1),(unnamed1))

I could probably continue, but it seems to me that I am inside the innards
of an area of the libs that I have no business in. What is it up in the
API
level that I am screwing up?