Experimental Physics and
Industrial Control System

Mark Rivers <[email protected]> · Tue, 22 Mar 2016 03:32:15 +0000

The EPICS Application Developer's Guide says the following: (Version 3.14.12.5 Page 97)

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6.3.2 Unquoted Strings

In the summary section, some values are shown as quoted strings and some unquoted. The actual rule is that any string
consisting of only the following characters does not have to be quoted unless it contains one of the above keywords:

     a-z A-Z 0-9 _ - : . [ ] < > ;

These are also the legal characters for process variable names. Thus in many cases quotes are not needed
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Note that it lists the legal characters for process variable names, and they do not include a space.

I would not use a space in a process variable name for this reason.  Even if it works in some applications today, it could break in the future.

Mark

________________________________________
From: [email protected] [[email protected]] on behalf of 梁雅翔 [[email protected]]
Sent: Monday, March 21, 2016 10:13 PM
To: tech-talk
Subject: caget pv with a space

Hi everyone,

   I have a small question.
   I have a pv named "Encode distance". It has a space in it, when I use the caget command.
   I got the Encode value and distance value.
   How I could do get the only value of the Encode distance ?

Regards,
Liang yx

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System