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Q214427: FIX: "Prompt To Save Changes" Setting Crashes VB IDE Upon Saving

Article: Q214427
Product(s): Microsoft Visual Basic for Windows
Version(s): WINDOWS:6.0
Operating System(s): 
Keyword(s): kbservicepack kbVBp600bug kbIDEProject kbGrpDSVB kbVS600sp3fix
Last Modified: 11-JAN-2001

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The information in this article applies to:

- Microsoft Visual Basic Learning Edition for Windows, version 6.0 
- Microsoft Visual Basic Professional Edition for Windows, version 6.0 
- Microsoft Visual Basic Enterprise Edition for Windows, version 6.0 
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SYMPTOMS
========

When you enable the "Prompt to Save Changes" setting in a Visual Basic IDE and
open a project and site a TextBox with its DataFormat property set to a value
other than default, the Visual Basic IDE crashes upon saving the project files
when the application is started from the Sub Main of a module.

STATUS
======

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

This bug was corrected in Visual Studio 6.0 Service Pack 3.

For more information about Visual Studio service packs, please see the following
articles in the Microsoft Knowledge Base:

Q194022 INFO: Visual Studio 6.0 Service Packs, What, Where, Why

Q194295 HOWTO: Tell That Visual Studio 6.0 Service Packs Are Installed

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

Steps to Reproduce Behavior
---------------------------

1. Create a new Standard EXE project in Visual Basic. Form1 is created by
  default.

2. Place a TextBox on Form1. Set Text1's DataFormat property to anything other
  than the default (Number, for instance), and then click Apply.

3. From the Project menu, add a Standard module to the project and paste the
  following code into Module1:

  Public Sub Main()
     Form1.Show
  End Sub

4. On the Tools menu, click Options. Select the Environment tab and make sure
  that Prompt to Save Changes is selected.

5. On the Project menu, click Project1 Properties. Set the Startup object as Sub
  Main.

6. Press the F5 key to run the project. Visual Basic will prompt you to save the
  files (frm, bas, and vbp). Accept the defaults and click OK. Once the save is
  completed, Visual Basic will crash with an error message and the IDE is shut
  down. The exact error message may differ, but should be similar to the
  following:

  VB6.EXE - Application Error
  The Instruction at "0x001a09b2" referenced memory at "0x00000000". The memory
  could not be "read"

Additional query words:

======================================================================
Keywords          : kbservicepack kbVBp600bug kbIDEProject kbGrpDSVB kbVS600sp3fix 
Technology        : kbVBSearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB600Search kbVBA600 kbVB600
Version           : WINDOWS:6.0
Issue type        : kbbug
Solution Type     : kbfix

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