Microsoft KB Archive/158500

= Updated DAO SDK Required for Visual C++ 4.2 =

Article ID: 158500

Article Last Modified on 8/9/2004

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APPLIES TO


 * Microsoft Visual C++ 4.2 Enterprise Edition
 * Microsoft Visual C++ 4.2 Professional Edition

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This article was previously published under Q158500



SUMMARY
The incorrect version of the DAO SDK was shipped with Visual C++ 4.2. This can cause run-time errors during execution of programs built with the DAO SDK. In addition, a number of corrections were made with the Visual C++ 4.2b patch. An updated version of the DAO SDK has been provided, recompiled using Visual C++ 4.2b.

The following files are available for download from the Microsoft Download Center:

Dbdao42.exe

For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to Obtain Microsoft Support Files from Online Services

Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to prevent any unauthorized changes to the file.

NOTE: Use the -d option when running Dbdao42.exe to decompress the file and recreate the proper directory structure.



MORE INFORMATION
In order to manage the heap properly, the DAO SDK must be recompiled to link with MFC42.DLL. The most common symptom is a failure to use CString properly during run time, which causes assertions at various locations within DBGHEAP.CPP.

In order not to break applications built using Visual C++ 4.0 and 4.1, the DAO SDK dynamic link library (DLL) has been renamed. The table below shows the 4.2 names and their 4.0/4.1 equivalents:

4.0 / 4.1 Version 4.2 Equivalent Does:
dbdao3.dll ddao3.dll ANSI / Release dbdao3.lib ddao3.lib " / " dbdao3d.dll ddao3d.dll ANSI / Debug dbdao3d.lib ddao3d.lib " / " dbdao3d.pdb ddao3d.pdb " / " dbdao3u.dll ddao3u.dll UNICODE / Release dbdao3u.lib ddao3u.lib " / " dbdao3ud.dll ddao3ud.dll UNICODE / Debug dbdao3ud.lib ddao3ud.lib " / " dbdao3ud.pdb ddao3ud.pdb " / "

You will want to copy the Visual C++ version 4.2 compatible files into the same locations as their 4.0/4.1 equivalents.

For any projects built with Visual C++ 4.2, you will want to link to the 4.2 version of the DAO SDK lib files. Because the updated DAO SDK files were built using the 4.2b patch, it is also recommended (but not fully required) that you apply the Visual C++ 4.2b patch.

Finally, in order to distribute your DAO 3.0-based application, you will want to acquire the latest DAO 3.0 components, as described in the article Q160554 mentioned in the REFERENCES section below.

