Just building a custom force node and one of the things I'm trying to do is
patch in some dynamic PP variables that should be wrapped up with the
.cvar.MPxFieldNode_mInputPPData reference. I can quite happily list all the
PP attrib names that are being picked up but I'm having some (okay, a lot)
of trouble trying to leverage the checkArrayExist method.
Don't suppose anyone has any suggestions on where else to hunt around in?
If there's a devkit example I've missed (I'm reading heavily off
dynExprField right now) or similar, would love to be pointed at it. Noting
of course, if this isn't strictly possible/sane/there's a better way, then
happy to be pointed in that direction too, not picky, more curious at this
stage.
Here's the relevant code fragment (it's embedded in the compute() of a
custom field deriving from MPxFieldNode ):
aInputPPData = OpenMayaMPx.cvar.MPxFieldNode_mInputPPData
mhInputPPData = block.inputArrayValue(aInputPPData)
mhInputPPData.jumpToElement(plugIndex)
hInputPPData = mhInputPPData.inputValue()
dInputPPData = hInputPPData.data()
inputPPData = OpenMaya.MFnArrayAttrsData(dInputPPData)
# okay, this is fine, I'll get the list of names
sys.stderr.write(inputPPData.list())
# the docs say if i'm trying to use enum types, I should be using a pointer
# to a short int.. okay. I can understand that. I think.
msu = OpenMaya.MScriptUtil(OpenMaya.MFnArrayAttrsData.kVectorArray)
fieldexists = inputPPData.checkArrayExist("fish",msu.asShortPtr())
With the error being:
# Traceback (most recent call last):
# File
"C:/Users/tanantish/Documents/maya/2012-x64/plugins/simpleField2.py", line
149, in compute
# fieldexists = inputPPData.checkArrayExist("fish",msu.asShortPtr())
# File
"c:\buildforge\Maya_2012_Win64_Build\build\wrk\optim\runTime\Python\Lib\site-packages\maya\OpenMaya.py",
line 3859, in checkArrayExist
# TypeError: in method 'MFnArrayAttrsData_checkArrayExist', argument 3 of
type 'MFnArrayAttrsData::Type &' //
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