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Q193016: PRB: Error Compiling VB5 Project Using LPVOID in Type Library

Article: Q193016
Product(s): Microsoft Visual Basic for Windows
Version(s): WINDOWS:6.0
Operating System(s): 
Keyword(s): kbGrpDSVB
Last Modified: 11-JAN-2001

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The information in this article applies to:

- Microsoft Visual Basic Learning Edition for Windows, version 6.0 
- Microsoft Visual Basic Professional Edition for Windows, version 6.0 
- Microsoft Visual Basic Enterprise Edition for Windows, version 6.0 
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SYMPTOMS
========

While compiling a Visual Basic 5.0 project in Visual Basic 6.0, if the Visual
Basic 5.0 project uses a type library that has a function that returns a LPVOID
or a structure that contains a LPVOID field, the following error occurs:

  Compile Error : Variable uses an Automation type not supported in Visual
  Basic

CAUSE
=====

LPVOID is a Typedef to "void *." Visual Basic 6.0 is changed to explicitly
prohibit the use of pointers in structures and as function return values.

RESOLUTION
==========

Avoid using LPVOID as a field in a structure or as a return value in the type
library. Instead, change them to type LONG respectively.

NOTE: Do not change the Typedef for LPVOID to LONG, because that would change the
meaning of LPVOID in function parameters where it is valid and desirable.

STATUS
======

This behavior is by design.

Additional query words: kbdss kbDSupport kbVBp kbVBp600 kbCompiler

======================================================================
Keywords          : kbGrpDSVB 
Technology        : kbVBSearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB600Search kbVBA600 kbVB600
Version           : WINDOWS:6.0
Issue type        : kbprb

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