PRB: Error Compiling VB5 Project Using LPVOID in Type Library

• Microsoft Visual Basic Learning, Professional, and Enterprise Editions for Windows, version 6.0

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 : kbGrpVB
Version : WINDOWS:6.0
Platform : WINDOWS
Issue type : kbprb