FIX: ClassWizard Overrides CDaoRecordset::Open Incorrectly

• The ClassWizard included with: Microsoft Visual C++, 32-bit Edition, versions 4.0, 4.1

SYMPTOMS

If you override the CDaoRecordset::Open() function using ClassWizard, the new function will never be called.

CAUSE

The Wizard places an UINT type for the first parameter rather than an int. The code should read:

   virtual void Open(int ...)

   virtual void Open(UINT...)

RESOLUTION

Change the type of the first parameter in your Open() function from UINT to

int in the .h and .cpp files.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This problem was corrected in Visual C++ version 4.2.

MORE INFORMATION

Sample Code

The following sample code shows the correct function prototype for a CDaoRecordset-derived class named CMySet:

   // CMySet.H:
   virtual void Open(int nOpenType = AFX_DAO_USE_DEFAULT_TYPE,
           LPCTSTR lpszSql = NULL, int nOptions = 0);

   // CMySet.CPP:
   void CMySet::Open(int nOpenType, LPCTSTR lpszSql, int nOptions)
   {
       // TODO: Add your specialized code here and/or call the base class

       CDaoRecordset::Open(nOpenType, lpszSql, nOptions);
   }

Keywords          : MfcDAO vcbuglist400 vcfixlist420 kbprg kbbuglist kbfixlist
Technology        : kbMfc
Version           : 4.00 4.10
Platform          : NT WINDOWS
Issue type        : kbbug
Solution Type     : kbfix