KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q129981: FIX: Custom Form Property Set to () Causes Infinite Loop

Article: Q129981
Product(s): Microsoft FoxPro
Version(s): WINDOWS:3.0,3.0b
Operating System(s): 
Keyword(s): kbvfp kbvfp300bBUG kbvfp500fixkbbuglist kbfixlist
Last Modified: 24-MAR-2000

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft Visual FoxPro for Windows, versions 3.0, 3.0b 
-------------------------------------------------------------------------------

SYMPTOMS
========

When a form is run with a DO FORM command, it appear to enter an infinite loop,
and you cannot release it. When the same form is modified with a MODIFY FORM
command, a Syntax Error is displayed. It is not possible to open the form.

CAUSE
=====

The value of a custom property has been incorrectly set to (); that is, the
value starts and ends with a parenthesis.

WORKAROUND
==========

You can manually open the form (SCX table) by using a USE command. Browse the
SCX table, and edit the Properties memo field to remove the property that is
causing the error. Then close the SCX table, and compile the form by using the
COMPILE FORM <name> command. Once the cause of the error has been removed,
you can edit the form with a MODIFY FORM command.

NOTE: manually editing the SCX table should be performed as a last resort. Use
extreme caution when deleting data from the SCX table.

If you must set a default value of () for the property, place quotation marks
around the the expression in the property sheet.

STATUS
======

Microsoft has confirmed this to be a problem in the Microsoft products listed at
the beginning of this article. This problem has been fixed in Visual FoxPro 5.0
for Windows.

When you attempt to modify the form in Visual FoxPro 5.0, the "Syntax Error"
message appears. However, the form opens.

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

Steps to Reproduce Problem
--------------------------

1. Create a form.

2. Add a new property.

3. Change the property value to ().

4. Save and close the form.

5. Type "MODIFY FORM <form>" (without the quotation marks) to edit the
  form.

Additional query words: evaluate

======================================================================
Keywords          : kbvfp kbvfp300bBUG kbvfp500fix kbbuglist kbfixlist
Technology        : kbVFPsearch kbAudDeveloper kbVFP300 kbVFP300b
Version           : WINDOWS:3.0,3.0b
Issue type        : kbbug
Solution Type     : kbfix

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

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.