This article was previously published under Q217216
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A GPF or assertion occurs when using CDaoDatabase::CreateRelation method against Access 2000 database with Visual C++ version 6.0.
Microsoft confirms that this behavior is due to a bug in the CDaoDatabase::CreateRelation() method in DAO 3.6. The implementation of this method can be found in Daocore.cpp.
In the CDaoDatabase::CreateRelation() method, a DAOFields pointer and a DAOField pointer is declared. In addition, the DAOFields collection is looped through, and the DAOField pointer is used to access a field in the DAOFields collection, and then release is called.At the end of the method, the following check is implemented:
if (pDAOField != NULL) pDAOField->Release();
Since pDAOField was used as a temporary it is not set to NULL. As a result, the Release() call draws an assertion in the DAO360.DLL implementation of Release() stating that Release() was called too many times. Consequently, Release() cannot set the pointer (pDAOField) that referenced it to NULL.
Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.
This bug was corrected in Visual Studio 6.0 Service Pack 3. For more information about Visual Studio service packs, please see the following articles in the Microsoft Knowledge Base: