Knowledge Base

You get a MIDL2039 warning when you compile an .idl file with IFontDisp or IPictureDisp as parameters

Article ID: 196830

Article Last Modified on 5/26/2005

Microsoft ActiveX Template Library 2.1, when used with:
- Microsoft Visual C++ 5.0 Enterprise Edition
- Microsoft Visual C++ 6.0 Enterprise Edition
- Microsoft Visual C++ 5.0 Professional Edition
- Microsoft Visual C++ 6.0 Professional Edition
- Microsoft Visual C++ 6.0 Standard Edition
Microsoft ActiveX Template Library 3.0, when used with:
- Microsoft Visual C++ 5.0 Enterprise Edition
- Microsoft Visual C++ 6.0 Enterprise Edition
- Microsoft Visual C++ 5.0 Professional Edition
- Microsoft Visual C++ 6.0 Professional Edition
- Microsoft Visual C++ 6.0 Standard Edition

This article was previously published under Q196830

SYMPTOMS

When you compile an .idl file with IFontDisp or IPictureDisp as parameters of methods in Visual C++ 5.0 or Visual C++ 6.0, you get a MIDL2039 warning.

CAUSE

This is due to a bug in Ocidl.idl source. You must add the dual attribute to the interface declarations for IFontDisp and IPictureDisp.

RESOLUTION

To prevent the warning, add the dual attribute to the IFontDisp and IPictureDisp interface declarations in Ocidl.idl, as in the following example:

   [
      object,
      dual,
      uuid(BEF6E003-A874-101A-8BBA-00AA00300CAB),
      pointer_default(unique)
   ]

   interface IFontDisp : IDispatch
   {
      typedef IFontDisp * LPFONTDISP;
   }

   [
      object,
      dual,
      uuid(7BF80981-BF32-101A-8BBB-00AA00300CAB),
      pointer_default(unique)
   ]

   interface IPictureDisp : IDispatch
   {
      typedef IPictureDisp * LPPICTUREDISP;
   }

STATUS

Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the "Applies to" section.

This problem was corrected in Microsoft Visual C++ .NET.

MORE INFORMATION

Steps to Reproduce Behavior

Create a new ATL COM AppWizard Project with DLL as the Server Type.
Insert a new ATL Control using the ATL Object Wizard, and add the Font stock property by selecting it from the Stock Properties tab of the wizard.
Build the .idl file generated by the wizard.

You should receive the following warnings:

warning MIDL2039 : interface does not conform to [oleautomation]
attribute

Keywords: kberrmsg kbtshoot kbbug kbfix kbnoupdate kbidl kbautomation KB196830