Experimental Physics and
Industrial Control System

Noboru Yamamoto <[email protected]> · Tue, 17 Jun 1997 09:16:44 +0900

Dear Tim,

Tim Mooney wrote:
>Noboru, regarding...
>
>>  Enclosed is a sample python program which displays windows on X-terminal.
>> Each window has a slider and a label which are both connected to EPICS channel.
>> 
>>  I also enclosed ca.py which implements EPICS channel class in python. ca.py
>> uses _ca module which are written in C. Python can retuns any value, includig
>> list called tuple in Python, as a return value of get().
>> Development status is quite preliminary but(or because of it) I appriciate
>> your comments.
>
>What _ca module are you talking about?  Have you compiled libca.a into
>Python, or created a shareable copy "ca.so" and linked it at run time
>with Python, or is _ca something entirely different?
>
>Tim Mooney

"_ca.c" defines wrapper functions to access some of EPICS CA functions
in libca.a  "_ca.c" defines a Python module "_ca", which includes 
functions such as search, get,put, pendIo. Python module ca.py uses 
these functions to access EPICS channels. 
Currently libca.a is statistically linked with Python, however,
it should be possible to use a runtime linking on the system which 
allow dynamic binding (just a guess).

====================================================
ca.py : defines channel class, uses _ca module.

_ca.c : implements _ca modude. exports search, get, put, pendIo funtions and
others. These functions eventually call libca.a functions such as
ca_search_and_connect().
====================================================

Regards,

Noboru 

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System