Experimental Physics and
Industrial Control System

Hi,

I'm attempting to use an asub  to read an array of
strings from a waveform record with Epics 3.14.11
The strings are written to the waveform with a 'caput -a'  e.g.

caput -a test:evt:WF6:ETA 4 "alas" "poor" "yorik" "Iknewhimhoratio"

Old : test:evt:WF6:ETA 10
New : test:evt:WF6:ETA 10 alas poor yorik Iknewhimhoratio

NORD and VAL of the waveform record are linked to INPB and
INPC of the asub, respectively.
The forward link of the waveform triggers the asub to process
and the subroutine tries to read an array of strings like so ...

 void loadETA(aSubRecord * asub)
 {
   int etaLen = *(short*)(asub->b);
   char** etaIn = (char**)(asub->c);

   for (int i = 0; i < etaLen; ++i)

The IOC terminates with a SEGV when the subroutine runs.
A call to    printf("%s\n", (char*)(asub->c));
prints the first string in the array, whereas I would have expected
asub->c to hold the address of the first string in the array.

I've been able to read an array of doubles from the waveform
with a subroutine similar to the above, but I'm stuck with the
strings.  Perhaps I'm doing something obviously wrong ?

Any help greatly appreciated.

Thanks-In-Advance,

--
Regards, Simon.

*================================================================*
|                                                     |       +  |
|  Simon Hoyle                                        |     +  + |
|  Software Engineer                                   \===O  +  |
|  CSIRO ATNF Parkes Observatory                       /[] | +   |
|  P.O. Box 276                 Ph. (02) 6861 1700    |HHH\|     |
|  Parkes  NSW  2870            FAX (02) 6861 1730    |OHO| \__  |
|  AUSTRALIA                  [email protected]    |HHH|      |
|                                                   """""""""""" |
*================================================================*

Replies:

Re: Reading an array of strings from a Waveform record Andrew Johnson

Navigate by Date:

Prev: Re: EPICS database comparison John Faucett

Next: Re: Any News on EPICS 3.14.11 with vxWorks 6.7 Ernest L. Williams Jr.

Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  <2009>  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 

Navigate by Thread:

Prev: Re: EPICS database comparison John Faucett

Next: Re: Reading an array of strings from a Waveform record Andrew Johnson

Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  <2009>  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024