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Q172256: FIX: RISC: CByte Doesn’t Fail on Negative Values in Native Exe

Article: Q172256
Product(s): Microsoft Visual Basic for Windows
Version(s): WINDOWS:5.0,97
Operating System(s): 
Keyword(s): kbVBp500bug kbVS97sp2fix kbvbp500sp2fix
Last Modified: 18-JUN-2001

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The information in this article applies to:

- Microsoft Visual Basic Enterprise Edition for Windows, version 5.0 
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SYMPTOMS
========

In a native executable, passing a negative value to the CByte function does not
generate an error. It should cause an Overflow error.

STATUS
======

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

This bug has been fixed in Visual Studio 97 Service Pack 2.

For additional information on the Visual Studio 97 Service Pack 2, click the
article number below to view the article in the Microsoft Knowledge Base:

  Q170365 INFO: Visual Studio 97 Service Packs - What, Where, and Why

For a list of the Visual Basic 5.0 bugs that were fixed in the Visual Studio 97
Service Pack 2, please see the following article in the Microsoft Knowledge
Base:

  Q171554 INFO: Visual Basic 5.0 Fixes in Visual Studio 97 Service Pack 2

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

This problem does not occur in the IDE or in P-Code executables. This problem
does not occur in the Intel version of the product regardless of how the
application is compiled. Once the RISC version of Visual Studio 97 Service Pack
2 is installed, code such as:

  Dim b as Byte b = CByte(-2)

correctly results in an Overflow error regardless of how the application is
compiled.

Additional query words:

======================================================================
Keywords          : kbVBp500bug kbVS97sp2fix kbvbp500sp2fix 
Technology        : kbVBSearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB500Search kbVB500
Version           : WINDOWS:5.0,97
Issue type        : kbbug
Solution Type     : kbfix

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