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<== Date ==> <== Thread ==>
Subject: Python EPICS interface (pyepics 3.1.1) double waveform record ( NLEM = 65535 ) record handling exception
From: Ritesh Sugandhi <[email protected]>
To: [email protected]
Date: Tue, 12 Apr 2011 17:29:33 +0200
Dear sir,


My Enviorment is 
----------------------

pyepics-3.1.1,
python 3.2
Linux kernal  2.6.18-194 ; 64 bit

Context: Testing pyepics library

Problem:
I am using supplied database (test/pydebug.db) and I am not able to use the double wave form record of 64k elements. while double wave form record of 2k elements works fine.

Any suggestion are welcome.

Best regards

---- EPICS shell------------------

epics> dbpr Py:double64k 2
ACKS: NO_ALARM      ACKT: YES           APST: Always        ASG:                
BKPT: 00            BUSY: 0             DESC: long double waveform              
DISA: 0             DISP: 0             DISS: NO_ALARM      DISV: 1             
DTYP: Soft Channel  EGU:                EVNT: 0             FLNK:CONSTANT 0     
FTVL: DOUBLE        HOPR: 0             INP:CONSTANT        LCNT: 0             
LOPR: 0             MPST: Always        NAME: Py:double64k  NELM: 65536         
NORD: 0             NSEV: NO_ALARM      NSTA: NO_ALARM      PACT: 0             
PHAS: 0             PINI: NO            PREC: 0             PRIO: LOW           
PUTF: 0             RARM: 0             RPRO: 0             SCAN: Passive       
SDIS:CONSTANT       SEVR: INVALID       SIML:CONSTANT       SIMM: NO            
SIMS: NO_ALARM      SIOL:CONSTANT       STAT: UDF           TIME: <undefined>   
TPRO: 0             TSE: 0              TSEL:CONSTANT       UDF: 1              
VAL: (nil)          

------------- Python shell -----------------------------

>>> pv1=PV('Py:double64k')
Traceback (most recent call last):
  File "_ctypes/callbacks.c", line 259, in 'calling callback function'
  File "/home/ITER/sugandr/Desktop/epics-python/Python-3.2/lib/python3.2/site-packages/epics/ca.py", line 391, in _onGetEvent
>>>     value = dbr.cast_args(args).contents
ValueError: NULL pointer access
Replies:
Re: Python EPICS interface (pyepics 3.1.1) double waveform record ( NLEM = 65535 ) record handling exception Matt Newville
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