Experimental Physics and
Industrial Control System

"Szalata, Zenon M." <[email protected]> · Tue, 4 Aug 2009 21:56:59 -0700

Below is my message that I sent out a few days ago.  I did some more investigating and I am confused by what I found.
1. I have created a short ASCII coded string:
   "Line 0\n Line 1\n Line 2"
2. I used genSub to create this string.  It is in VALA field which is
   of type "CHAR" and length 100.
3. using caget I verify that the string in VALA is as it was created.
4. In EDM, I verify that pv->get_string() returns a string of characters,
   where each '\n' character is replaced with "(0A)" string.

So, it appears that this conversion is done probably in epicsPv .
I wonder why is it done this way?  What is the gain? 

Thanks,
Zen

-----Original Message-----
From: Szalata, Zenon M. 
Sent: Saturday, August 01, 2009 10:05 PM
To: [email protected]
Subject: EDM: Text Monitor Widget

I have an ASCII coded string which contains new line characters.  Effectively, the null terminated string contains a small number of "lines".  This string is formatted in genSub record and the output field in which the string is held is of type "CHAR" and of length n characters, long enough to hold the string.

When I display this string in an EDM Text Monitor widget, the new line characters are displayed as (0A) and the text that follows is not displayed on next line.  I was hoping that the new line character imbedded in a string would have the expected behavior.  In fact, Text Monitor, Text Update, and Text Control, all do the same thing with the new line character.

Is there a way in EDM to display such a string effectively as printf would?

I know that I could break up the string into separate lines of text, one per EPICS record, but that would end up with a lot of extra record and much extra work.  Besides, it would be difficult to handle a variable number of lines of text...

Thanks in advance,
Zen

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System