Q141950: FIX: GP Fault When Change RecordSource of a Column in a Grid

Article: Q141950
Product(s): Microsoft FoxPro
Version(s): WINDOWS:3.0
Operating System(s): 
Keyword(s): kbVBp300bug kbvfp600 kbvfp600fix
Last Modified: 03-AUG-2000

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The information in this article applies to:

- Microsoft Visual FoxPro for Windows, version 3.0 
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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

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Keywords          : kbVBp300bug kbvfp600 kbvfp600fix 
Technology        : kbVFPsearch kbAudDeveloper kbVFP300
Version           : WINDOWS:3.0
Issue type        : kbbug
Solution Type     : kbfix

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