DOCUMENT:Q232778  11-FEB-2002  [visualc]
TITLE   :FIX: MIDL Gives Warning MIDL2039 When Decimal Parameter Is Used
PRODUCT :Microsoft C Compiler
PROD/VER::5.0,6.0
OPER/SYS:
KEYWORDS:kbCompiler kbCOMt kbVC500bug kbVC600bug kbNoUpdate

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The information in this article applies to:

 - Microsoft Visual C++, 32-bit Enterprise Edition, versions 5.0, 6.0 
 - Microsoft Visual C++, 32-bit Professional Edition, versions 5.0, 6.0 
 - Microsoft Visual C++, 32-bit Learning Edition, version 6.0 
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SYMPTOMS
========

When you compile an .idl file with decimal as the type of parameter for a
method, you get an MIDL2039 warning. But it is documented that the decimal is a
valid type for a parameter (for example, search the MSDN Library Index for
"oleautomation").

STATUS
======

Microsoft has confirmed this to be a bug in the Microsoft products listed at the
beginning of this article.

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

MORE INFORMATION
================

Steps to Reproduce the Behavior
-------------------------------

1. Copy the following code into a new file and save it as an .idl file.

   import "oaidl.idl";
   import "ocidl.idl";
   [
   	object,
   	uuid(DE4C1D8D-C007-11D2-B978-00AA00C0018D),
   	dual,
   	helpstring("IFoo1 Interface"),
   	pointer_default(unique)
   ]
   interface IFoo1 : IDispatch
   {
   };

   [
   	uuid(DE4C1D80-C007-11D2-B978-00AA00C0018D),
   	version(1.0),
   	helpstring("huh 1.0 Type Library")
   ]
   library HUHLib
   {
   	importlib("stdole2.tlb");

   	[
   		uuid(DE4C1D8F-C007-11D2-B978-00AA00C0018D),
   		hidden,
   		helpstring("_IFoo1Events Interface")
   	]
   	dispinterface _IFoo1Events
   	{
   		properties:
   		methods:
   		[id(1), helpstring("method MIDL2039")] HRESULT MIDL2039([in] Decimal d);
   	};

   	[
   		uuid(DE4C1D8E-C007-11D2-B978-00AA00C0018D),
   		helpstring("Foo1 Class")
   	]
   	coclass Foo1 {

   		[default] interface IFoo1;
   		[default, source] dispinterface _IFoo1Events;
   	};
   };

2. Now compile it with Microsoft Interface Definition Language (MIDL) and see
   the warning:

   huh.idl(38) : warning MIDL2039 : interface does not conform to 
   [oleautomation] attribute :   [ Parameter 'd' of Procedure 'MIDL2039' ( 
   Dispinterface '_IFoo1Events' ) ]

Additional query words:

======================================================================
Keywords          : kbCompiler kbCOMt kbVC500bug kbVC600bug kbNoUpdate 
Technology        : kbVCsearch kbAudDeveloper kbVC500 kbVC600 kbVC32bitSearch kbVC500Search
Version           : :5.0,6.0
Issue type        : kbbug
Solution Type     : kbfix

=============================================================================

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