FIX: Report Variables Return Incorrect Values

ID: Q107555

2.50 2.50a WINDOWS kbprg kbfixlist kbbuglist

The information in this article applies to:

SYMPTOMS

Report variables initialized through a user-defined function (UDF) in a self-referential fashion (for example, memvar = memvar + 1) return improper values.

STATUS

Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article. This problem was corrected in FoxPro 2.5b for Windows.

MORE INFORMATION

Steps to Reproduce Problem

1. From the Command window or a program, execute the following code. It 

   will create two sample tables and indexes, populate them with data, and
   set up a one-to-many relationship.

      ***Start sample code***
      CLOSE DATABASES
      SET SAFETY OFF
      CREATE TABLE parent (id_num C(3))
      INSERT INTO parent (id_num) VALUES ('001')

      SELECT 0
      CREATE TABLE child (id_num C(3) ,chld_total N(4,2))
      INDEX ON id_num TAG id_num
      FOR i=1 TO 5
         INSERT INTO child (id_num, chld_total) VALUES ('001',i)
      NEXT

      SELECT parent
      SET ORDER TO TAG id_num OF child.cdx IN child
      SET RELATION TO id_num INTO child ADDITIVE
      SET SKIP TO child
      SET SAFETY ON
      ***End sample code***
2. Create a report with the parent.id_num and child.chld_total fields in 
   the Detail band.
3. Create a data grouping based on parent.id_num.

4. Create a report variable with these properties: 

      Name: memvar
      Value to store: memvar
      Initial value: memvar + child.chld_total
      Release after report: Checked
      Reset: parent.id_num
      Calculate: Nothing
5. Create a Summary band and place a field in it based on memvar.

6. Save the report and the environment and name the report SELF_REF.FRX. 

   NOTE: Saving the environment doesn't affect the behavior of the report.
7. Issue the following commands in the Command window: 

     GO TOP
     REPORT FORM self_ref.frx PREVIEW ENVIRONMENT
Note the value in the Summary band--it is 3 when it should be 1.

Additional reference words: FoxWin 2.50 2.50a buglist2.50a fixlist2.50b KBCategory: kbprg kbfixlist kbbuglist KBSubcategory: FxprgGeneral 

Keywords          : FxprgGeneral kbbuglist kbfixlist
Version           : 2.50 2.50a
Platform          : WINDOWS
Solution Type     : kbfix

Last Reviewed: October 16, 1997