BUG: LOOKUP() Function with SET RELATION Causes Crash

• Microsoft FoxPro for MS-DOS, versions 2.5, 2.5a, 2.5b, 2.6

SYMPTOMS

In the Extended (32-bit) version of FoxPro for MS-DOS (FOXPROX.EXE), using the LOOKUP() function with a SET RELATION command may cause the system to terminate abnormally. In the Standard (16-bit) version of FoxPro for MS-DOS (FOXPRO.EXE), the above commands may cause an "Internal Consistency Error."

CAUSE

This problem arises while using LOOKUP() on a related table.

RESOLUTION

To work around this problem, do one of the following:

• Use a SEEK routine to move the record pointer to the desired record, then retrieve the contents of a specified field in the record.

  -or-

• Release the relation before using the LOOKUP() function with either SET RELATION OFF TO <table name> or SET RELATION TO.

STATUS

Microsoft has confirmed this to be a problem in FoxPro versions 2.5, 2.5a, 2.5b, and 2.6 for MS-DOS. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

Steps to Reproduce Problem

WARNING: Close all files and save your data before completing the following procedure.

The following program will generate the error message:

   CREATE TABLE city (fc_number n(10), name c(10))
   INSERT INTO city VALUES(1,"Toledo")
   INDEX ON fc_number TAG fc_number

   SELECT 0
   CREATE TABLE person (pe_number n(10), fc_number n(10))
   INSERT INTO person VALUES (1,1)
   SET RELATION TO fc_number INTO city

   ? LOOKUP(city.name,1,person.pe_number)