Microsoft KB Archive/171522

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Knowledge Base

FIX: Enums in Public Procedures Cause Binary Compatibility Error

Article ID: 171522

Article Last Modified on 12/10/2003


  • Microsoft Visual Basic 5.0 Control Creation Edition
  • Microsoft Visual Basic 5.0 Learning Edition
  • Microsoft Visual Basic 5.0 Professional Edition
  • Microsoft Visual Basic 5.0 Enterprise Edition

This article was previously published under Q171522


Using Enums as parameters/arguments in class module methods may result in binary compatibility errors.


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

170365 : 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:

171554 : INFO: Visual Basic 5.0 Fixes in Visual Studio 97 Service Pack 2


If you use Enum statements in class modules, they may cause adverse behavior to your application when compiling and running if compatibility is set to "Binary Compatibility." This seems to occur most frequently when enums are used as parameters within a class's Method declaration in an ActiveX control or DLL. Adverse behavior in your program may include "type mismatches" between arguments and parameters even though they are correct. Compiler problems include Visual Basic thinking the compatibility has been broken when it hasn't, and linker errors during compilation.

To reproduce a compiling error (linker error):

  1. Create a new ActiveX Control.
  2. Add a new Class Module, and paste in the following code:

          Property Let Name(Effect As Stooge)
                   Msgbox "You Changed The Name"
          End Property
  3. Add the following to the Control's General Declarations section:

          Public Enum Stooge
          End Enum
  4. Compile the Control.
  5. Under Project -> Project Properties -> Components, change the compatibility to "Binary Compatibility."
  6. Recompile the Control. You will get the following error message from the linker:

    "Unexpected error in code generator or linker - View error messages?"

Additional query words: kbDSupport

Keywords: kbbug kbfix kbvbp500sp2fix kbvs97sp2fix KB171522