Updated DAO SDK Required for Visual C++ 4.2

ID: Q158500

The information in this article applies to:

Microsoft Visual C++, 32-bit Editions, version 4.2
Microsoft Visual C++, 32-bit Enterprise Edition, version 4.2

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. Click the file names below to download the files:

Dbdao42.exe

For more information about how to download files from the Microsoft Download Center, please visit the Download Center at the following Web address

http://www.microsoft.com/downloads/search.asp

and then click How to use the Microsoft Download Center.

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.

REFERENCES

For more information, please see the following articles in the Microsoft Knowledge Base:


   ARTICLE-ID: <LINK TYPE="ARTICLE" VALUE="Q160554">Q160554</LINK>


   TITLE     : PATCH: Updated DAO Redistributable Components


   ARTICLE-ID: <LINK TYPE="ARTICLE" VALUE="Q156934">Q156934</LINK>


   TITLE     : PATCH: Visual C++ 4.2b Patch


   ARTICLE-ID: <LINK TYPE="ARTICLE" VALUE="Q151426">Q151426</LINK>


   TITLE     : How to Create a DAO Setup that Installs Jet IISAM Files

Additional query words:

Keywords : kbfile kbprg kbDAO
Version :
Platform : NT WINDOWS
Issue type :