PRB: Erroneous Error When Repeatedly Opening Database

• Microsoft Visual FoxPro for Windows, version 6.0

SYMPTOMS

If you open a database located on a server numerous times from multiple Visual FoxPro 6.0 executables, then the following error randomly appears:

This file is incompatible with the current version of Visual FoxPro. Run 30UPDATE.PRG to update the file to the current version.

RESOLUTION

Use any ON ERROR procedure, such as the one in the code example in the MORE INFORMATION section below, to trap for the spurious error.

MORE INFORMATION

This behavior does not occur in Visual FoxPro 5.0x.

Steps to Reproduce Behavior

1. Set up a server machine and a client machine. Install Visual FoxPro 6.0 on the client machine.



2. On the client machine, create a project and build an executable containing the following code:

   
      CLEAR
      ON ERROR DO Errorhandler WITH ERROR(), MESSAGE()
      KEY=0
      OPENED=0
      errored=0
      DO WHILE KEY=0
         OPEN DATA k:\robert SHARED
         OPENED=OPENED+1
         @1,1 SAY "Opened:" + STR(OPENED)
         @2,1 SAY "Errored:" + STR(errored)
         CLOSE DATA
         KEY=INKEY(1)
      ENDDO
      QUIT
   
      PROCEDURE Errorhandler (nError,  messx)
      errored=errored+1
      @3,1 SAY nError
      @4,1 SAY messx
      RETRY
      ENDPROC 




3. From the client machine, use Windows Explorer and map a drive K that points to a shared folder on the server machine.



4. Create a database on the K drive using Visual FoxPro 6.0. This database does not need to contain any tables.



5. Go to the client machine and start at least four instances of the Visual FoxPro executable created in step 2 using Windows Explorer. You many need to start more instances to recreate the problem.

Additional query words: kbDSupport KBDSE

Keywords : kbDatabase kbVFp600 KbDBFDBC
Version : WINDOWS:6.0
Platform : WINDOWS
Issue type : kbprb