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
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After extracting the project (by running ADOVC1.exe), open the project with Visual C++. Change "DefaultDir=C:\\test;" in the connection string to the directory where the files are, or move the Authors.mdb file to the "C:\test" directory. There is also a connection string to the Pubs database if you have SQL Server 6.5 or 7.0.
The CREATEiNSTANCE macro is used to create the ADO Connection and Recordset objects. If the creation fails, the macro throws a _com_error exception, which is caught in the catch statement that wraps the code body.
If ADO is not installed in the default directory, you must change the #import statement to reflect its actual location.
It is not necessary to use the absolute path for the ADO .dll file. You can add the path to Visual Studio IDE from the Tools menu under Options. Click the Directory tab and add the path to the Library files list, which allows you to use the statement:
You can read about the #import directive in the Visual C++ programmer's guide.
Although the sample program is only one page long, it covers all the basics of ADO from C++, without negelecting error handling.
For additional information, please see the following articles in the Microsoft Knowledge Base:
182389 FILE: Adovcbm.exe ADO 1.5 with #import and Getrows/Bookmarks
184968 FILE: Adovcsp.exe Demonstrates Using Stored Procedures with ADO
186387 SAMPLE: Ado2atl.exe Returns ADO Interfaces from COM
181733 FILE: Adovcbtd.exe #import Using UpdateBatch and CancelBatch