How to add item to StringVectorParameter in python

[Dawei Sun]

Hello, 

We are developing tools using cortex, we created a few Ops which has StringVectorParamenter, I know we can add an item using the "Add Item" button in the UI, but we need add items in python or C++, how do we add items using script to StringVectorParameter?

thanks

[Andrew Kaufman]

You need to set the value of the entire parameter at once:

value = p.getValue()
value.append( "new string" )
# setValue isn't strictly necessary in this case, because value above is actually a pointer to the data still being held by the parameter, so you've already edited it in place.
p.setValue( value )

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[Dawei Sun]

I tried this, 

            fnPH = IECoreMaya.FnParameterisedHolder(self.node[0])

            curves = cmds.getAttr("%s.parm_curve"%self.node[0])

            

            with fnPH.parameterModificationContext():

                curve_parm = fnPH.getParameterised()[0].parameters()["curve"]

                print repr(curve_parm.getValue())

                v = curve_parm.getValue()

                v.append(shape_c[0])

                curve_parm.setValue(v)

when I use with fnPH.parameterModificationContext(): maya crashes immediately, if I do not use with fnPH.parameterModificationContext(): the UI does not update and maya crashes when I refresh the Op.  

[Andrew Kaufman]

I'm assuming curve_parm is a StringVectorParameter, but is it possible that shape_c[0] isn't actually a string? Maybe its unicode instead and that's causing issues?

Andrew

[Dawei Sun]

curve_parm is StringVectorParameter,

and I change the code to:

            print repr(shape_c[0])  # unicode

            v.append(str(shape_c[0])) # convert to string before append to vlaue

still crash maya.

[John Haddon]

Could you set the MAYA_DEBUG_ENABLE_CRASH_REPORTING environment variable to 1, and then send us the stack trace you get when Maya crashes?

Cheers...

John

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From: cort...@googlegroups.com [cort...@googlegroups.com] on behalf of Dawei Sun [sundawe...@gmail.com]
Sent: Wednesday, December 10, 2014 1:12 PM
To: cort...@googlegroups.com
Cc: sundawe...@gmail.com; Andrew Kaufman
Subject: Re: [cortex] How to add item to StringVectorParameter in python

[Dawei Sun]

We found out why it is crashing, it is not the cortex code, it is our custom procedure that connect to the curveOp result.  thanks for all the help.