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Q241481: BUG: Internal Protection Fault When Using Format Function

Article: Q241481
Product(s): Microsoft Visual Basic for Windows
Version(s): WINDOWS:6.0
Operating System(s): 
Keyword(s): kberrmsg kbVBp kbVBp600 kbGrpDSVB kbDSupport
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
========

If you use the Format function to format a numeric character sequence, and
include a format sequence that includes a numeric value to be used in the Null
section of the format, you may get this error:

  The instruction at "0x65396ac3" referenced memory at "0x00000028". The memory
  could not be "read"

NOTE: The exact memory locations may vary from system to system.

RESOLUTION
==========

To work around this problem, you need to escape all of the characters in the
fourth section of the numeric format. For example, instead of:

  format$(Null,"#,##0.00;;;0.00")

you should do:

  format$(Null,"#,##0.00;;;\0\.\0\0")

STATUS
======

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

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

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

1. Start a new Standard EXE project. Form1 is created by default.

2. Add a Command Button to the form. It is Command1.

3. Add the following code to the form:

  Private Sub Command1_Click()
       Msgbox format$(Null,"#,##0.00;;;0.00")
  End Sub

4. Run the Code. When you press Command1, you should get an error that says:

  The instruction at "0x65396ac3" referenced memory at "0x00000028". The memory
  could not be "read".

  NOTE: The exact memory locations may vary from system to system.

REFERENCES
==========

Numeric formats are covered in the Visual Basic Documentation under the section:
"Different Formats for Different Numeric Values (Format Function)"

Additional query words:

======================================================================
Keywords          : kberrmsg kbVBp kbVBp600 kbGrpDSVB kbDSupport 
Technology        : kbVBSearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB600Search kbVBA600 kbVB600
Version           : WINDOWS:6.0
Issue type        : kbbug
Solution Type     : kbpending

=============================================================================

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