DOCUMENT:Q138872 03-AUG-2001 [visualc] TITLE :FIX: TRACE() Message Appears When Closing DAO Objects PRODUCT :Microsoft C Compiler PROD/VER:winnt: OPER/SYS: KEYWORDS:kbDAOsearch kbDatabase kbMFC kbVC kbVC420fix ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - The Microsoft Foundation Classes (MFC), included with: - *EDITOR Please do not choose this product*Microsoft Visual C++ 32-bit Edition* use 241, 265, 225, versions 4.0, 4.1 ------------------------------------------------------------------------------- SYMPTOMS ======== The MFC DAO classes provide warning messages to the debug output window when appropriate. This tracing can be turned off by disabling the database tracing by using the Tracer utility. However, two possible problems exist: - An MFC AppWizard-generated DAO application may display the following TRACE message in the Output Window of the debugger: Warning: call Close before destructing Recordset This message can safely be ignored. The destructor for the CDaoRecordset class will clean up properly. - A bug in the debug tracing will incorrectly display the offending module and line of code for _UNICODE builds. There are some TRACE calls in Daocore.cpp in the AfxDaoCheck and AfxDaoTrace functions, which incorrectly use a %s specifier with ANSI strings. This doesn't work in a _UNICODE build, so you are likely to get random characters. These calls should use %hs to force ANSI. As a workaround, rebuild the debug versions of the MFC libraries to use %hs instead of %s. The release versions of the MFC libraries are unaffected by this because TRACE calls are eliminated from release builds. The information is located in the Readme for Microsoft Visual C++. STATUS ====== Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug has been fixed in Visual C++ version 4.2. Additional query words: kbVC400bug ====================================================================== Keywords : kbDAOsearch kbDatabase kbMFC kbVC kbVC420fix Technology : kbAudDeveloper kbMFC Version : winnt: Issue type : kbbug Solution Type : kbfix ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.