PRB: Conflict with EOF When Using #import with ADO

Last reviewed: January 30, 1998
Article ID: Q166112

The information in this article applies to:

ActiveX Data Objects (ADO) included with: - Microsoft Visual C++, 32-bit Editions, versions 4.2, 5.0

SYMPTOMS

With #import, it is possible to generate classes that encapsulate the typelib of database API's, such as ActiveX Data Objects (ADO), within a windows application. For example:

   // Excerpt from Stdafx.h
   #include <afxwin.h>         // MFC core and standard components
   ...
   #import "C:\Program Files\Common Files\System\ADO\Msado10.dll"

When doing so, you may receive the following errors from the #import for ADO on the Recordset.EOF property:

   error C2629: unexpected 'short ('
   error C2238: unexpected token(s) preceding ';'

NOTE: The same error occurs with ADO version 1.5 using Msado15.dll.

CAUSE

Within an application that uses STDIO.H, IOS.H or STREAMB.H (including AFXWIN.H ), EOF has already been defined as a constant (-1). #import then attempts to define the EOF property for ADO's Recordset or RDO's Resultset objects, and generates the C2629/C2238 errors on this line of generated code in the MSADO10.TLH file:

   VARIANT_BOOL EOF;

This line is attempting to define a variable, but EOF has already defined it as -1. As a result, this line of code parses to:

   short -1;

This does not compile because -1 is not a valid variable name.

RESOLUTION

To correct this, you can use the rename attribute of #import as shown below:

   #import "C:\Program Files\Common Files\System\ADO\msado10.dll" \
           rename( "EOF", "A_EOF" )

Rename changes the name of any "EOF" string that #import finds in the specified typelib to a new value.

NOTE: When you use ADO version 1.5, replace Msado10.dll with Msado15.dll.

Keywords          : kbprg adoengall adoengdb adovc MfcDatabase
Version           : 5.0
Platform          : NT WINDOWS
Issue type        : kbprb

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Last reviewed: January 30, 1998
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