Experimental Physics and
Industrial Control System

Dirk Zimoch via Tech-talk <[email protected]> · Fri, 15 Feb 2019 11:09:14 +0100

The | in the regexp needs to be escaped:

in "%#/[.0-9]+\|//%f";

in "%#/\|[.0-9E+-]+//%f";

Without the escape it means "a number or an empty string". The empty

string matches always and is replaced by an empty string, not changing

the string at all and advancing by 0 bytes. Looking for the next match

starts the endless loop.

Need to fix that.

But otherwise it works. I got the two arrays.

If you want to do further processing on the arrays, be aware that the

"I/O Intr" record gets the value before the active one. So by the time

the active record processes its FLNK or triggers any monitors, the "I/O

Intr" record has already the corresponding value.

Dirk

On 15.02.19 10:58, Dirk Zimoch via Tech-talk wrote:

I tested it and it hung up my ioc. Seems I have a bug in regsub.

On 15.02.19 09:55, Dirk Zimoch via Tech-talk wrote:

Unfortunately StreamDevice cannot easily parse such interlaced arrays

at the moment.

Maybe the following works:

For the values:
Separator=",";
in "%#/[.0-9]+|//%f";

For the Timestamps:
Separator=",";
in "%#/|[.0-9E+-]+//%f";

%#/regexp/subs/ is the regular expression pre-processor, here removing

the "other" array from the input. Performance may be not so good and

scales like O(n²) with the array length because of all the copying

involved.

One of the records should be active having the 'out' command that

produces the reply. The other should be "I/O Intr" reading the time

stamps passively.

Not tested. Hope it works.
Dirk

On 14.02.19 18:35, Joao Afonso via Tech-talk wrote:

Hello,

I have a string returned by a device, representing an array where

each element is a pair <time, value>:

- each pair is separated by "|": <timestamp>|<value>
- each element of the array separated by ","
- all values are floats

- the timestamp increment may not be linear (that is why it needs to

be recorded)

Example
0.1000|0.1230000E+00,0.2000|0.4560000E+00,0.3000|0.7890000E+00, [...]

Is it possible to parse this using stream device (into two waveform

records)?

Or do I have to use something more powerful such as asynDriver?

I have seen several examples, but only with using simple type

elements, not like this.

As a followup, is it possible to do the inverse, merging two waveform

records into a string?

Thank you in advance,
Joao
CERN TE-EPC-CCS

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System