BUG: CArchiveException for Read-only and Write-only Files

 Last reviewed: July 7, 1997
Article ID: Q87554

The information in this article applies to:
  • The Microsoft Foundation Classes (MFC), included with: - Microsoft Visual C++ for Windows, versions 1.0, 1.5, 1.51, 1.52 - Microsoft Visual C++ 32-bit Edition, version 1.0, 2.0, 2.1, 4.0, 

         4.1

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.

Keywords : MfcFileIO
Technology : kbMfc
Version : 1.0 1.5 1.51 1.52 2.0 2.1 4.0
Platform : MS-DOS NT WINDOWS
Issue type : kbbug

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Last reviewed: July 7, 1997
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