BUG: CArchiveException for Read-only and Write-only Files (87554)
The information in this article applies to:
- The Microsoft Foundation Classes (MFC), when used with:
- Microsoft Visual C++, 32-bit Professional Edition
- Microsoft Visual C++, 32-bit Enterprise Edition
- Microsoft Visual C++, 32-bit Learning Edition
This article was previously published under Q87554 SYMPTOMS
The CArchiveExceptions for read-only and write-only archives are not thrown
by the Microsoft Foundation Class Library. This condition can be caught by
checking for an access denied CFileException.
CAUSE
This is an oversight of the MFC libraries. The CArchive class does not
utilize a try/catch block in its member functions that actually perform the
serialization. Thus, a CArchiveException will never be thrown for read-only
and write-only archives.
RESOLUTION
To test for this condition, look for a CFileException with an m_cause value
of CFileException::accessDenied.
STATUS
Microsoft has confirmed this to be a problem in the versions of the
Microsoft Foundation Classes listed above. We are researching this problem
and will post new information here in the Microsoft Knowledge Base as it
becomes available.
MORE INFORMATION
The CArchiveException class is used to handle exceptions that happen when
using the CArchive class. The cause of the CArchiveException can be found
by checking the m_cause data member of CArchiveException. Two of the values
listed for m_cause are CArchiveException::readOnly and
CArchiveException::writeOnly. For more information, refer to the Visual C++
Books Online topics for CArchive and CArchiveException.
| Modification Type: | Major | Last Reviewed: | 12/11/2003 |
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| Keywords: | kbBug kbFileIO KB87554 |
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