FIX: RISC: CByte Doesn't Fail on Negative Values on Native Exe

ID: Q171575

The information in this article applies to:

Microsoft Visual Basic Enterprise Edition for Windows, version 5.0
Microsoft Visual Studio, Enterprise Edition 97

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 bug in the Microsoft products listed at the beginning of this article. This bug has been corrected in the RISC version of Visual Studio 97 Service Pack 2.

For more information on the Visual Studio 97 Service Pack 2, please see the following 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 PCode 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 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 : kbVBp500 kbVS97sp2fix kbGrpVBDB kbvbp500sp2fix
Version : WINDOWS:5.0,97
Platform : WINDOWS
Issue type : kbbug