Microsoft KB Archive/177703

= FIX: Access Violation with Public Enums in UserControl =

Article ID: 177703

Article Last Modified on 11/5/2003

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APPLIES TO


 * Microsoft Visual Basic 5.0 Professional Edition
 * Microsoft Visual Basic 5.0 Enterprise Edition

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This article was previously published under Q177703



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. This bug has been fixed in Visual Basic 6.0.



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

 Create a new ActiveX control project. Add another UserControl to the project so you have UserControl1 and UserControl2. Place UserControl2 inside UserControl1.  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

 Close the design windows of UserControl1 and UserControl2.</li> Add a Standard EXE project so that you have a project group. Form1 is created by default.</li> Add UserControl1 to Form1.</li> Optional: Save the project group.</li> Exit Visual Basic to close the project group.

In Windows 2000, you receive the following error:

The instruction at "0x0fb20cc8" referenced memory at "0x00000010". The memory could not be read.

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

Access Violation in VB5.exe at 0x0fb25f69

In Windows 95, Windows 98, or Windows Me, you receive the following error:

VB5 caused an invalid page fault in module VBA5.DLL

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Additional query words: IPF GPF crash

Keywords: kbbug kbfix kbvbp600fix kbctrlcreate kbcontrol KB177703

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