BUG: Access Violation with Public Enums in UserControl

• Microsoft Visual Basic Professional and Enterprise Editions for Windows, version 5.0

SYMPTOMS

When exiting a Visual Basic 5.0 ActiveX Control project in the design environment, an Access Violation error occurs and Visual Basic is terminated.

CAUSE

This problem can occur when declaring Public Enum in the UserControl module when running Visual Studio 97 Service Pack 2 (SP2.)

RESOLUTION

Move the Public Enums to a standard (.bas) module instead of the UserControl module.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. We are researching this bug and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

Steps to Reproduce Behavior

NOTE: To reproduce the problem, you must have Visual Studio 97 Service Pack 2 installed.

1. Create a new ActiveX control project.

2. Add another UserControl to the project so you have UserControl1 and UserControl2.

3. Place UserControl2 inside UserControl1.

4. Add the following code to UserControl1:

         Option Explicit
   

         Public Enum BorderStyle_Type
            None = 1
            FixedSingle = 2
         End Enum
   
         Public Enum Appearance_Type
            Flat = 1
            ThreeDimensional = 2
         End Enum
   
   

5. Close the design windows of UserControl1 and UserControl2.

6. Add a Standard EXE project so that you have a project group. Form1 is created by default.

7. Add UserControl1 to Form1.

8. Optional: Save the project group.

9. Exit Visual Basic to close the project group.

   In Windows NT 4.0, Service Pack 3 you receive the following error:

         Access Violation in VB5.exe at 0x0fb25f69
   

   In Windows 95, you receive the following error:

         VB5 caused an invalid page fault in module VBA5.DLL