FIX: SQL-SELECT into Array Causes Illegal Operation (171272)

SYMPTOMS

Using a SQL-SELECT statement to populate an array from a FoxPro 2x table containing deleted records with DELETED set on causes the operating system to close Visual FoxPro 5.0.

When running under Windows 95, the following error appears:

This program has performed an illegal operation and will be shut down.

In Windows NT 4.0, the following error appears:

An application error has occurred and an application error log is being generated.
VFP.exe
Exception: access violation <error number>, Address: <memory address>.

In both cases, the operating system then closes Visual FoxPro.

RESOLUTION

Do not issue a SET DELETED ON command and simply rewrite the SQL-SELECT statement, as in the following example:

   SELECT * FROM ZTEST INTO ARRAY Zjunk WHERE DELETED()=.F.

-or-

   SELECT * FROM ZTEST INTO ARRAY Zjunk WHERE !DELETED()

Also, the results of the SQL-SELECT statement could be directed to a destination other than to an array.

STATUS

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 5.0a and does not occur in Visual FoxPro 3.x.

MORE INFORMATION

Steps to Reproduce Behavior

Run the following code in a program file or line by line from the Visual FoxPro Command window: CLEAR SET SAFETY OFF USE HOME()+"samples\data\customer.dbf" EXCLUSIVE COPY TO HOME()+"Ztest.dbf" TYPE FOX2X SET SAFETY ON CLOSE ALL USE HOME()+"Ztest.dbf" DELETE ALL FOR RECNO() < 10 USE SET DELETED ON SELECT * FROM HOME()+"Ztest" INTO ARRAY Zjunk ? ALEN(zjunk) USE