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Article ID: 197193 - Last Review: October 16, 2002 - Revision: 1.1
FIX: Application Error in Locals Window with Specific Variables
This article was previously published under Q197193
When you do the following:
- Run a program that uses several variables consisting of single alpha
character names.
- Release a form.
- Scroll the Debugger Locals window to look at some of the variable
values.
Windows displays an application error message, and Visual FoxPro is
terminated.
The message displayed depends on the operating system:
- Under Windows NT, an error message similar to the following appears:
An application error has occurred and an application error log is
being generated.
vfp.exe
Exception: access violation (0xc0000005), Address 0x0043e8db
- Under Windows 9x, an error message similar to the following appears:
This program has performed an illegal operation and will be shut
down. If the problem persists, contact the program vendor.
VFP caused an invalid page fault in module VFP.EXE at 0137:0044940e.
Microsoft has confirmed this to be a bug in the Microsoft products listed
at the beginning of this article. This bug has been corrected in Visual
FoxPro 6.0.
Steps to Reproduce Behavior
- Run the following code from a program (.prg) file:
SET STEP ON
CLEAR DEBUGGER
STORE .t. to a,b,c,d,e,f,g,h
KEYBOARD "{enter}"
TheForm=CreateObject("aForm")
TheForm.show
READ events
RETURN
DEFINE class aForm as form
ADD object aButton as commandbutton
PROCEDURE aButton.click
thisform.release
ENDPROC
ENDDEFINE
- Switch to the debugger by pressing ALT+Tab.
- Scroll down in the Locals Window to the last item by clicking on the
down arrow in the Locals Window scroll bar.
- The Locals window scroll bar must be visible for this behavior to occur.
If you do not see the error, you can make the Locals window shorter by
resizing it with the mouse, and repeating the steps.
RESULT: You will receive an application error that will vary depending on
the operating system. See the SYMPTOMS section above for details. The
addresses may vary depending on operating system version or Visual FoxPro 5
build number.
This only happens with these specific variable names. If you modify the
STORE command in the program above to read as follows, the behavior does
not occur:
STORE .t. to aa,bb,cc,dd,ee,ff,gg,hh
As a rule, it is a good idea to avoid the letters "A" through "N",
uppercase or lowercase, for variable, field, or table names. Visual FoxPro
uses these as default alias names for tables when tables are opened and
their names are already in use.
Example:
USE table1
USE table1 AGAIN IN 0
The second table1 will be used under the alias A.
This error does not occur if you do not scroll in the Locals window.
(c) Microsoft Corporation 1998, All Rights Reserved. Contributions by Jim
Saunders, Microsoft Corporation
APPLIES TO
- Microsoft Visual FoxPro 5.0 Standard Edition
- Microsoft Visual FoxPro 5.0a
| kbbug kbfix kbmisctools kbvfp600fix kbxbase KB197193 |
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