DOCUMENT:Q141950  03-AUG-2000  [foxpro]
TITLE   :FIX: GP Fault When Change RecordSource of a Column in a Grid
PRODUCT :Microsoft FoxPro
PROD/VER:WINDOWS:3.0
OPER/SYS:
KEYWORDS:kbVBp300bug kbvfp600 kbvfp600fix

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

 - Microsoft Visual FoxPro for Windows, version 3.0 
-------------------------------------------------------------------------------

SYMPTOMS
========

A general protection (GP) fault occurs when you change the RecordSource property
of a column in a grid.

CAUSE
=====

The GP fault may be caused by opening a table in area 256 or greater. For
example:

USE TEST IN SELECT(1)

This uses the last available work area, usually 32767.

STATUS
======

Microsoft has confirmed this to be a problem in the Microsoft products listed at
the beginning of this article. This has been corrected in Visual FoxPro 6.0.

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

Steps to Reproduce Behavior

1. Create a free table called Test with two fields named First and Last. Make
   both fields Character(10). Enter a couple of rows of sample data.

2. Create a blank form.

3. Add a grid to your form and change its ColumnCount property to 1.

4. Add a command button to your form, and place the following code in its Click
   event: THISFORM.Grid1.Column1.ControlSource = "last"

5. Add the following code to the Init event of your form: USE TEST IN 256
   THISFORM.Grid1.RecordSource = "test"

6. Run the form, and click the command button.

The GP fault occurs with details similar to the following information:

   VFP caused an invalid page fault in
   module KERNEL32.DLL at 0137:bff858c0.
   Registers:
   EAX=7fd89e61 CS=0137 EIP=bff858c0 EFLGS=00010202
   EBX=009dfe28 SS=013f ESP=008e0000 EBP=008e03bc
   ECX=00000000 DS=013f ESI=815958c0 FS=3be7
   EDX=c001ebf0 ES=013f EDI=815a8f08 GS=0000
   Bytes at CS:EIP:
   55 a1 78 c2 fb bf 8b ec 83 ec 70 8b 08 53 56 89
   Stack dump:
   ffecbad7 008e0030 008e0014 0000000e
   00000004 c0000005 00000000 00000000
   7fd89e61 00000002 00000000 7fd89e61
   0001001f 00000000 00000000 00000000

Additional query words: VFoxWin akz

======================================================================
Keywords          : kbVBp300bug kbvfp600 kbvfp600fix 
Technology        : kbVFPsearch kbAudDeveloper kbVFP300
Version           : WINDOWS:3.0
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.

Copyright Microsoft Corporation 2000.