Experimental Physics and
Industrial Control System

Kate Feng <[email protected]> · Thu, 06 Dec 2007 13:51:48 -0500

Andrew Johnson wrote:
Kate Feng wrote:
MEDM version 3.03 :
When I defined only three states for a  mbbo record,
the following warning message will pop up whenever  CA is
connected.
menuUpdateValueCb: Got state 3.
 Only have strings for 3 states (starting at 0).
 Kate:Mset_formatmode


Your record has three state strings for states #0, 1 and 2, but the
VAL field is set to 3 which does not correspond to a valid state.
Either you need to define a fourth state string, or change the record
so it is never set to the value 3. This is not a bug in MEDM.


At this point, I do not have time to trace down all the source
code b/c I am in the middle of urgent task.  However, I think there
is a bug either in EPICS base (more likely) or in MEDM because my
S/W set the VAL field to be 2 at init_mbbo_record().  It was never
set to 3 at my part of software. However,
apparently, either EPICS base or MEDM set it to be 3.
When I get a chance , I will look at the mbbo record of the EPICS base.
Regards,
Kate

A minor patch stops the warining message:
diff -c -u medmMenu.c.orig medmMenu.c

--- medmMenu.c.orig Tue Jun 10 12:13:27 2003
+++ medmMenu.c Thu Nov 29 07:24:48 2007
@@ -510,7 +510,7 @@
        XmNnumChildren,&numChildren,
        NULL);
      i = (int) pr->value;
-      if((i >=0) && (i < (int) numChildren)) {
+      if((i >=0) && (i <= (int) numChildren)) {


This change would add an off-by-one bug to MEDM, which we will not do.
As the warning message states, there are only three defined states for
this record starting at state number 0. With your fix in place, try
putting the integer value 4 into that MBBO record and you'll get the
same problem, showing that you haven't fixed what you think you have.
- Andrew



Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System