Re: How to define a global variable and global array in python script for a widget of Control system studio (CS

[Anton Derbenev <aaderbenev@gmail.com>]

Zhefu,

as Kay pointed out, the documentation describes some common use-cases for PVs in scripts. If the PV approach works for you, however, you might consider implementing the desired logic in your IOC instead. It is easily done on database level (e.g. with calc record). In this case you won't have to deal with OPI scripts.

Anton.

On Mon, Oct 30, 2017 at 8:49 AM, Kasemir, Kay <kasemirk@ornl.gov> wrote:

Hi:

​

This is how you read:

> data="">)

This is _not_ how you write, since you obviously can't assign anything to the number returned by getDouble():

> PVUtil.getDouble(pvs[1])=data
> 
> However, the error occurs:
> SyntaxError:("can't assign to function call", ('<script>',3,0, 'PVUtil.getDouble(pvs[0])=value\n'))

This is how you would write:

pvs[1].setValue(data)

If you want to use scripts, it might be a good idea to study the example scripts in BOY Examples/scripts, where "setValue" is used a couple of times.

Or read the online help:

CSS Applications, Displays, BOY, Script, Access PV, "2. Write PV Value" introduces PV.setValue.

-Kay