Re: [foxboro] FoxDraw Alias Question
- From: "Johnson, Alex" <alexander.johnson@xxxxxxxxxxxxxxxxxxxxxx>
- To: "foxboro@xxxxxxxxxxxxx" <foxboro@xxxxxxxxxxxxx>
- Date: Fri, 10 Oct 2014 13:06:49 -0500
You might try:
== {GRP}. .
If {GRP} resolves to an empty sting then dot (.) equals dot (.)
Make sense?
AJ
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Alex Johnson | Schneider Electric | Invensys | United States | System
Architect, Next Generation Systems
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-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Coon, Richard M
Sent: Friday, October 10, 2014 12:53 PM
To: 'foxboro@xxxxxxxxxxxxx'
Subject: [foxboro] FoxDraw Alias Question
I have developed a graphics library using FoxDraw aliasing but I have an issue
that I need some help with.
I have 2 alias named {GRP} and {TRD} that the user resolves using the filename
of the group display {GRP} or Trend display {TRD} that they want to open when
the user hits the GROUP or TREND button on the overlay. The problem is that
this doesn't work unless I resolve it with something so I use 'NULL' and check
for 'NULL' in the script i.e.
== {GRP} NULL .....
Is there any script command that can check for 'nothing' rather than having to
resolve to 'NULL'? Or is there any way to pre-define the alias to 'NULL'?
Thanks in advance,
Richard Coon
Application Engineer
*richard.m.coon@xxxxxxxxxxxxxx<mailto:richard.m.coon@xxxxxxxxxxxxxx>
ExxonMobil
BES / Beaumont Area Engineering Specialists Beaumont Polyethylene Plant (BPEP)
Beaumont, TX 77713
'(409) 860-2214 Office
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