Microsoft KB Archive/143408

= FIX: Assertion Failure After Using CDaoWorkspace::Create =

Article ID: 143408

Article Last Modified on 11/18/2003

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APPLIES TO


 * Microsoft Visual C++ 4.0 Standard Edition
 * Microsoft Visual C++ 4.1 Subscription
 * Microsoft Foundation Class Library 4.2

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This article was previously published under Q143408



SYMPTOMS
Using a CDaoWorkspace object after calling the CDaoWorkspace::Create function may cause an assertion failure in Daocore.cpp line 651 inside the CDaoWorkspace::Open function.



CAUSE
When a newly created CDaoWorkspace object is used for the first time, the CDaoWorkspace::Open function is called. This function should only be called to retrieve either a named workspace or the default workspace from the workspaces collection.

MFC relies on the value of the m_bOpen member variable to determine if the workspace object's Open function needs to be called. This member variable is set to TRUE only inside the Open and Append member functions.



RESOLUTION
Call CDaoWorkspace::Append before using a newly created workspace object.



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++, 32-bit Edition, version 4.2.



Sample Code
CDaoWorkspace wsp; wsp.Create(_T("NewWorkspace"), _T("admin"), _T("")); // Call Append to set the m_bOpen flag. // This will also append the workspace to the engine's workspaces // collection wsp.Append;

CDaoDatabase db(&wsp); db.Open(_T("c:\\path\\to\\mdbfile.mdb"), FALSE, FALSE, NULL); ...

Additional query words: kbVC400bug 4.00 4.10 vcfixlist420

Keywords: kbbug kbfix kbdatabase KB143408

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