FIX: Trim Format on GET Field Causes Nonterminating Loop

The information in this article applies to:

• Microsoft FoxPro for MS-DOS, version 2.0

SYMPTOMS

When you are attempting to append a record to a database, a trim format applied to a GET field in a screen will cause nonterminating looping to occur, when the trim format is used in conjunction with a VALID clause that returns false when the field is empty. This behavior occurs both when the GETs are memory variables as well as database fields.

RESOLUTION

This looping will not occur if the Trim picture clause is not used or if the VALID clause is not used.

STATUS

Microsoft has confirmed this to be a problem in FoxPro 2.0 for MS-DOS. This problem was corrected in FoxPro 2.5 for MS-DOS.

MORE INFORMATION

Steps to Reproduce Problem

1. Create a database with one field.

2. Create a quick screen using the Screen Builder.

3. Double-click the GET field. Choose the Format button.

4. Select the Trim check box. Choose OK.

   The format will now contain @T.

5. Select the VALID clause check box for the GET field. Place the following code in the VALID clause.

         IF EMPTY(fieldname)
           RETURN .F.
         ENDIF
   
   

6. On the screen, place a push button that appends a record.

7. Save and generate the screen program (.SPR).

8. In the Command window, type:

         DO <screen name>.spr