Microsoft KB Archive/118759

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FIX: "Operation failed, no current record" Message

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Q118759

1.00 1.50 WINDOWS kbprg kbfixlist kbbuglist -- The information in this article applies to: The Microsoft Foundation Classes (MFC), included with: - Microsoft Visual C++ for Windows, versions 1.0 and 1.5 -- SYMPTOMS ======== In an MFC database application that uses CRecordsets, open a recordset with a query that will result in at least two records. Call Delete to delete one of the records. Call Requery to regenerate the recordset. Now call Edit or Delete and you will see something similar to the following in the output window: DBMS: ACCESS, Version: 1.1 Operation failed, no current record. Warning: Throwing an Exception of type CDBException Error: Un-caught Exception (CDBException) AfxTerminate called AfxAbort called CAUSE ===== This message occurs because Requery does not reset the m_bDeleted variable that is set when you call Delete. When you call Edit or Delete after the Requery, m_bDeleted is checked and if it is TRUE, the application assumes that there is no valid current record. RESOLUTION ========== To correct the bug, override CRecordset::Requery in your derived CRecordset class and reset the m_bDeleted member to FALSE. In the "MORE INFORMATION" section, below, is an example of an overridden Requery. STATUS ====== Microsoft has confirmed this to be a bug in the Microsoft Foundation Classes, versions 2.0 and 2.5. This bug was corrected in MFC version 2.51, included with Visual C++ version 1.51. MORE INFORMATION ================ Sample Code --- // CMyRecordset is derived from CRecordset. BOOL CMyRecordset::Requery { m_bDeleted=FALSE; return CRecordset::Requery; } Additional reference words: 1.00 1.50 2.00 2.50 record set KBCategory: kbprg kbfixlist kbbuglist KBSubcategory: MfcDatabase

Keywords : kb16bitonly kbDatabase kbMFC kbODBC kbVC

Issue type :

Technology : kbAudDeveloper kbMFC