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Q246596: Cannot Use VBScript Classes with Application or Session Scope

Article: Q246596
Product(s): Internet Information Server
Version(s): winnt:5.0
Operating System(s): 
Keyword(s): kbOSWin2000
Last Modified: 13-MAY-2002

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The information in this article applies to:

- Microsoft Internet Information Services version 5.0 
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SYMPTOMS
========

The VBScript 5.0 engine allows the creation of user defined classes, similar to
the Visual Basic classes.

When you attempt to assign a class as an Application variable, the following
error message occurs:

  Error Type:
  Application object, ASP 0197 (0x80004005)
  Disallowed object use
  Cannot add object with apartment model behavior to the application intrinsic
  object.
  /<path>/<file.ext>, line <nn>

In addition, when you assign a class to a Session variable, the following error
message occurs when you attempt to use the class:

  Error Type:
  Microsoft VBScript runtime (0x800A01B6)
  Object doesn't support this property or method: <class variable>
  /<path>/<file.ext>, line <nn>

CAUSE
=====

This behavior is by design. There are specific threading issues that prevent
this functionality from being exposed at the Application or Session level.

RESOLUTION
==========

Only use VBScript classes with page-level scope.

WORKAROUND
==========

To work around this issue, use Include files to store VBScript classes. To do
this perform the following steps:

1. Save the following ASP code as Convert.inc in a folder with at least Script
  access:

  <%
  Class Convert
  	Function Celsius(F)
  		Celsius = ((F-32)*5)/9
  	End Function
  	Function Fahrenheit(C)
  		Fahrenheit = ((C*9)/5)+32
  	End Function
  End Class
  %>

2. Save the following ASP code as Convert.asp in the same folder as the above
  file:

  <% @LANGUAGE="VBSCRIPT" %>
  <!--#include file="class.inc"-->
  <% Set MyConvert = New Convert %>
  <html>
  <body>
  <pre>32F = <%=MyConvert.Celsius(32)%>C</pre>
  <pre>32C = <%=MyConvert.Fahrenheit(32)%>F</pre>
  </body>
  </html>

3. When you browse the Convert.asp page, the following should be returned:

  

  32F = 0C
  32C = 89.6F

Note: The above example does not preserve class state between pages. In other
words, if any variables are created in the class, they will be destroyed when
the page goes out of scope.

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

For more information on Microsoft Scripting Technologies, please see the
Microsoft Developer Network (MSDN) Web site at the following URL:

  http://msdn.microsoft.com/scripting/

Note: Microsoft provides programming examples for illustration only, without
warranty either expressed or implied, including, but not limited to, the implied
warranties of merchantability and/or fitness for a particular purpose. This
article assumes that you are familiar with the programming language being
demonstrated and the tools used to create and debug procedures. Microsoft
support professionals can help explain the functionality of a particular
procedure, but they will not modify these examples to provide added
functionality or construct procedures to meet your specific needs. If you have
limited programming experience, you may want to contact a Microsoft Certified
Partner or the Microsoft fee-based consulting line at (800) 936-5200. For more
information about Microsoft Certified Partners, please visit the following
Microsoft Web site:

  http://www.microsoft.com/partner/referral/

For more information about the support options that are available and about how
to contact Microsoft, visit the following Microsoft Web site:

  http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

Additional query words:

======================================================================
Keywords          : kbOSWin2000 
Technology        : kbiisSearch kbiis500
Version           : winnt:5.0
Issue type        : kbprb
Solution Type     : kbpending

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

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