BUG: LOCATE NEXT n or LOCATE REST Fail If Started from BOF

• Microsoft Visual FoxPro for Windows, versions 3.0, 3.0b, 5.0, 5.0a, 6.0
• Microsoft FoxPro for Windows, version 2.6a

SYMPTOMS

When the LOCATE REST or LOCATE NEXT n commands are used at the beginning of a file (BOF), and if the first record matches the FOR condition, the FOUND() function returns .F., and the record pointer cannot be moved off the BOF.

WORKAROUND

Do not use the LOCATE REST or the LOCATE NEXT n commands when at BOF.

STATUS

Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article.

MORE INFORMATION

Steps to Reproduce Behavior

1. Run the following code from a program (.prg) file:

   
     * Start of code example
      *
      CLEAR
      CREATE TABLE test (field1 c(40))
      INSERT INTO test VALUES ('test 1')
      INSERT INTO test VALUES ('test 2')
      GO TOP
      SKIP -1                         && Moves to BOF
      ? 'BOF() after SKIP -1:', BOF()
      LOCATE REST FOR !EMPTY(field1)
      ? 'FOUND():', FOUND()           && Incorrectly returns .F.
      ? 'RECNO():' + STR(RECNO(),2)   && Returns 1 even if BOF() = .T.
      ? 'BOF():', BOF()               && Should return .F. - should have gone
                                      && to record 1
      GO TOP
      ? 'BOF() after GO TOP:', BOF()
      LOCATE REST FOR !EMPTY(field1)
      ? 'FOUND():', FOUND()           && Correctly returns .T.
      ? 'RECNO():' + STR(RECNO(),2)   && Returns 1
      ? 'BOF():', BOF()               && Returns .F. as expected
      *
      * End of code example 




2. The first FOUND() function returns .F., although for the first record, field1 is not Empty. The BOF() function returns .T., though the record pointer should have been moved by the LOCATE() function.

• The LOCATE NEXT n command behaves the same way as the LOCATE REST command. The LOCATE RECORD, LOCATE ALL, and LOCATE commands with no scope clause work properly.



• If the first record does not satisfy the FOR condition, as long as another record matches the FOR condition, the record pointer is moved and the FOUND() and the BOF() functions are updated correctly.



• If no record satisfies the FOR condition, both the BOF() and the EOF() functions return .T.

Additional query words: kbvfp300 kbvfp300b kbvfp500 kbvfp500a kbvfp600

Keywords : kbprg kbVFp kbVFp500abug buglist3.00 FoxWin FxprgTable kbvfp260abug
Version : WINDOWS:2.6a,3.0,3.0b,5.0,5.0a,6.0
Platform : WINDOWS
Issue type : kbbug