FIX: Incorrect Prototype in ClassWizard CRecordset::Move() Override (214442)

SYMPTOMS

When you use the ClassWizard to generate an override for the Move() virtual method in a CRecordset derived class, the prototype provided is incorrect.

This produces a new virtual function, not an override for the Move() method specified in the base class. As a result, whenever the Move() function is called through a pointer to the base class (CRecordset) the generated Move() function that the developer expects to override the base class Move()) is ignored, and the base class Move() is called instead.

RESOLUTION

Manually edit the generated text or do not use the ClassWizard.

The generated text is:

class CMyRecordset : public CRecordset
{  // [...]
   //{{AFX_VIRTUAL(CMyRecordset)
   public:
   // [...]
   virtual void Move(long lRows);
   //}}AFX_VIRTUAL
   // [...]
};

Edit as follows:

class CMyRecordset : public CRecordset
{  // [...]
   //{{AFX_VIRTUAL(CMyRecordset)
   public:
   // [...]
   virtual void Move(long lRows, WORD wFetchType = SQL_FETCH_RELATIVE);
   //}}AFX_VIRTUAL
   // [...]
};

You need to make similar changes in the implementation file for CMyRecordset::Move().

STATUS

Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.

This problem was corrected in Microsoft Visual C++ .NET.

MORE INFORMATION

Steps to Reproduce Behavior

Create a new MFC project with any level of database support.
Use ClassWizard to add a new class, CMyRecordset derived from CRecordset.
Right-click on the new class in ClassView and click Add virtual function. Click Move.

RESULT: Look in the header file and the implementation file for the generated class. The prototype used for Move() is not correct.