Error c2248 afxcoll.h line 357

error c2248 afxcoll.h line 357

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Interesting moment: Error c2248 afxcoll.h line 357

CONFIGURE ERROR MAKEDEPEND IS REQUIRED
Error c2248 afxcoll.h line 357
Ts socket error
Error c2248 afxcoll.h line 357
Autocad error aborting unhandled access violation reading
error c2248 afxcoll.h line 357 m_hObject != NULL); ASSERT(!m_bAcquired); m_bAcquired = m_pObject->Lock(dwTimeOut); return m_bAcquired; } BOOL CSingleLock::Unlock() { ASSERT(m_pObject != NULL); if (m_bAcquired) m_bAcquired = !m_pObject->Unlock(); // successfully unlocking means it isn't acquired return !m_bAcquired; }

How many fundamental design errors can you spot in this code? Let's see, we can't pass a pointer to it to another thread because the m_bAcquired is not using any form of synchronized access. It assumes that recursive acquisition can never exist, error c2248 afxcoll.h line 357, because it assumes on a Lock syntax error unexpected t_var that m_bAcquired is FALSE. It is set if the lock is acquired. If it is not set, the Unlock code cannot be executed.

How, exactly, this could ever possibly make sense for a mutex, semaphore, CRITICAL_SECTION or event escapes me. It cannot make sense. For example, error c2248 afxcoll.h line 357, and I discovered this years ago, if the Event has a name and is shared between processes, each process will have its own CSingleLock object and the correlation of the m_bAcquired state and the actual state is impossible to maintain.

Had the m_bAcquired variable been eliminated, this code could be made to work, but as it stands, this code is complete crap, and must never be used (unless, of course, you have no interest in the correctness of your code).

Does not exist. Why not?

Does not have a See Also to CDC::GetCurrentBrush, CDC::GetCurrentFont,CDC::GetCurrentPalette, CDC::GetCurrentPen, or CDC::GetCurrentObject.

Does not have a See Also to CDC::GetCurrentBitmap, CDC::GetCurrentFont,CDC::GetCurrentPalette, CDC::GetCurrentPen, or CDC::GetCurrentObject.

Does not have a See Also to CDC::GetCurrentBitmap, CDC::GetCurrentBrush, CDC::GetCurrentPalette, error c2248 afxcoll.h line 357, CDC::GetCurrentPen or CDC::GetCurrentObject.

Does not have a See Also to CDC::GetCurrentBitmap, CDC::GetCurrentBrush, CDC::GetCurrentFont, CDC::GetCurrentPalette, or CDC::GetCurrentPen.

Does not have a See Also to CDC::GetCurrentBitmap, CDC::GetCurrentBrush, CDC::GetCurrentFont, CDC::GetCurrentPen or CDC::GetCurrentObject.

Does not have a See Also to CDC::GetCurrentBitmap, CDC::GetCurrentBrush, CDC::GetCurrentFont, CDC::GetCurrentPalette or CDC::GetCurrentObject.

This fails if executed in a DC where the SetWorldTransform has applied a transformation where the values have gone infinite (e.g., a zero-height shear of infinite width). This would not be so bad, except the code has two serious implementation problems:

  • It creates a VERIFY failure in the debug build
  • In both builds it returns meaningless values (uninitialized variable)

The fix would certainly involve initializing the SIZE value in the function to (0, 0), and removing the VERIFY. The user should be expected to be able to respond properly to such an error. My workaround was

BOOL ok = ::GetTextExtentPoint32(dc->m_hAttribDC, s, (int)s.GetLength(), &sz);

Does not work correctly in GM_ADVANCED with scaling. See DPtoLP

This does not exist, and should. It can be written as

XFORM M; .set M ::ModifyWorldTransform(dc, &M, mode); // for CDC

or

XFORM M; .set M ::ModifyWorldTransform(*dc, error c2248 afxcoll.h line 357, &M, mode); // for CDC*

because of the implicit CDC::operator(HDC) which will do the correct casting.