Experimental Physics and
Industrial Control System

Zimoch Dirk via Tech-talk <tech-talk at aps.anl.gov> · Fri, 13 Oct 2023 12:53:43 +0000

Hi Gerrit,

If you do not set your InTerminator to the normal line terminator for this
protocol (i.e. inside the { } ), then the 'in' command will read all the lines
(terminated by readTimeout). If there is a "special" terminator after reply
(e.g. 2 newlines) even better: Set InTerminator accordingly.

Now you can parse for your unique identifier with a regex search.
ExtraInput=ignore;
in "%/unique identifier[^\n]*/";

This should give you the matching line (as a string).

or
in "%.1/unique identifier/([\n]*)";
should give you everything after the the identifier.

To read a number after the identifier:
in "%*/unique identifier/%f)";

Or several numbers:
in "%*/unique identifier/%(\$1:rec1)f,%(\$1:rec1)f,%f";

%/regex/ searches the a match (skipping everything before) and returns the
match. %.n/regex/ returns the match for the n-th () in the regex.
%*/regex/ skips the match (returns nothing) and lets you continue parsing for
data right after the match.

Give example data for more details (so that I do not have to guess).

Dirk

On Fri, 2023-10-13 at 14:15 +0200, Gerrit Kühn via Tech-talk wrote:
> Hello,
> 
> I have a couple of devices on a bus. I can get a list of the devices and
> their properties using an enumeration call. I am interested in some of
> these properties and the answer line for a particular device would be easy
> to parse with streamdevice. However, the answer for the whole bus consists
> of several of these lines while I am only looking for one (and I know how
> it starts, containing an unique device identifier).
> Is there some way to do this with streamdevice or to I need a different
> approach? I cannot use the recommended solution from the "Tips&Tricks"
> section of the manual and use multiple IN-statements as I do neither know
> how many of these there will be, nor the number of the one I am looking
> for.
> 
> 
> cu
>   Gerrit

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System