FIX: Application Error in Locals Window with Specific Variables

MORE INFORMATION

Steps to Reproduce Behavior

1. 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
   							

2. Switch to the debugger by pressing ALT+Tab.
3. Scroll down in the Locals Window to the last item by clicking on the down arrow in the Locals Window scroll bar.
4. 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