When you compile an Interface Definition Language (.idl)
file which imports the Msxml2.idl file, you may receive several error messages
regarding the redefinition of XML interfaces:
D:\Program
Files\Microsoft Visual Studio\VC98\INCLUDE\msxml.idl(50) : error MIDL2003 :
redefinition : XMLELEMTYPE_ELEMENT
D:\Program Files\Microsoft Visual
Studio\VC98\INCLUDE\msxml.idl(51) : error MIDL2003 : redefinition :
XMLELEMTYPE_TEXT
D:\Program Files\Microsoft Visual
Studio\VC98\INCLUDE\msxml.idl(52) : error MIDL2003 : redefinition :
XMLELEMTYPE_COMMENT
One of the other files that your .idl file imports, such as
Ocild.idl, implicitly imports the Msxml.idl file, which causes duplication and
results in the redefinition errors.
The Msxml2.idl file that ships with the Microsoft XML
(MSXML) 3.0 Service Pack 1 Software Development Kit (SDK) resolves the problem
when it is used with the Msxml.idl file that shipped with Visual C++ 6.0 (dated
April 1998). To avoid the error, you just need to add the
IMPORTED_MSXML macro as an option with the Microsoft Interface Definition
Language (MIDL) compiler; for example:
midl /D IMPORTED_MSXML test.idl
NOTE: The fix in MSXML 3.0 SP1 does not resolve the redefinition
problem that exists for the Msxml.idl that comes with the Windows Platform SDK
that is dated February 2000.
You also need to have the MIDL Compiler
version 5.03.0280. If you do not have it, you will receive the following error
message:
midl\oleaut32.dll : error MIDL2020 : error
generating type library : AddImplType failed : IXMLDOMDocument
You
can download the latest Platform SDK from the following Microsoft Web site:
To set up the Platform SDK, select
Custom installation, then open the
Tools section and select
Platform SDK Tools. After you install this, MSDEV uses the new version of MIDL.
Microsoft
has confirmed that this is a problem in the Microsoft products that are listed
at the beginning of this article.
This bug was corrected in Microsoft XML 3.0 Service Pack 1 SDK.
For additional information on other fixes included in Microsoft
XML 3.0 Service Pack 1, click the article number below to view the article in
the Microsoft Knowledge Base:
292935Â
(http://kbalertz.com/Feedback.aspx?kbNumber=292935/EN-US/
)
INFO: List of Issues Fixed in Microsoft XML 3.0 Service Pack 1
For the latest information and downloads of MSXML,
refer to the following MSDN Web site at:
To reproduce this problem, add the following code to your
.idl file and then compile it using the MIDL compiler:
import "msxml2.idl";
import "oaidl.idl";
import "ocidl.idl";