This is my first real shot at dealing with attrs and plugs in the
API. I'm trying to do something pretty simple: If an attr is type
string, query and print the value. I have this working with just
about every other attr type, but string is causing the code to crash
\exit with no errors or warnings.
In the below example, I've created a simple poly plane (with only 4
verts). I then walk it's plug hierarchy for the uvSet attr. After
I've collected all the plugs & child plugs, I loop over them seeing if
they're of type string, and if so, get their value.
However, I'm failing terribly. As mentioned, whenever I comment out
either of the two "methods" I've come up with below, the code quits
running on that loop with no errors or warnings. try\except doesn't
help. What am I missing people? ;)
#------------------
import maya.OpenMaya as om
attr = 'uvSet'
node = "pPlaneShape1"
# Get an MObject by string name:
selList = om.MSelectionList()
selList.add(node)
mObject = om.MObject()
selList.getDependNode(0, mObject)
# Get a plug based on the attribute name:
mFnDependencyNode = om.MFnDependencyNode(mObject)
rootPlug = mFnDependencyNode.findPlug(attr)
plugs = [rootPlug]
# get the MPlug for the compound attribute
for plug in plugs:
if plug.isCompound():
for i in range(plug.numChildren()):
plugs.append(plug.child(i))
# Now query values:
for plug in plugs:
attr = plug.attribute() # MObject
if attr.hasFn(om.MFn.kTypedAttribute):
attrFn = om.MFnTypedAttribute(attr)
attrType = attrFn.attrType()
if attrType == om.MFnData.kString:
val = 'I wish I knew'
# Method A:
#stringData = om.MFnStringData(plug.asMObject())
#val = stringData.string()
# Method B:
#val = plug.asString()
print plug.name(), val
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