Python Addcallbackattribute Help (plus Mstring)

[roomie]

Sorry about the double post, this was supposed to be a reply!!!!!

I guess im having issues with python calling my CB method, doesnt seem to want to do it. It's adding the attributeChangedCallback, but isnt actually firing off my CB method when an attribute has changed. If you have any knowledge on how to do this in python that would be great, I appear to be messing it up somewhere. Also in Python, there is no destructor, so I can I clear my callBackId's when my node is destroyed?

Also 1 more thing...sorry to ask this hear instead of the python forum, but I have a node with a kString attribute, it returns a MString, even though python has no support for MString....how can I extract my data out of the MString into a normal string? I seem to be having issues with that! Thanks!!!!!

tony

[roomie]

CODE

def postConstructor(self):
    thisNode = self.thisMObject()
    cID = OpenMaya.MNodeMessage.addAttributeChangedCallback(thisNode,attrChangedCB,None)
    callBackIDList.append(cID)
    cID = OpenMaya.MNodeMessage.addNodeDestroyedCallback(thisNode,nodeCleanUpCB,None)
    callBackIDList.append(cID)

#callBack procs
def attrChangedCB(msg,srcPlug,destPlug,clientData):
    print msg
    if msg == OpenMaya.MNodeMessage.kConnectionMade:
        pNode = OpenMaya.MFnDependencyNode(srcPlug.node())

def nodeCleanUpCB(clientData):
    OpenMaya.MDGMessage.removeCallbacks(callBackIDList)

my postConsctructor method is in my node class, and the CB live outside...no matter what I try these callbacks are registering but not firing off....any ideas guys? Ive tried almost everything I can think of.

tony

[c_porz]

Hi Tony,
have you been successful with setting up your "addAttributeChangedCallback" function? I'm trying the same at the moment (Maya Python Api) and I had no luck so far.
I have no idea where and how Maya generates the MNodeMessage in order to store it in "msg"
And how do I tell Maya, which node-attributes it should monitor? Currently I have no other nodes connected to it. However, I have added several typed-attributes (Strings) to my node. Using the compute function I can generate an output if a node is connected to the output-attribute.
I have to admit, that I'm new to the Maya Api and C++. I have more knowledge about Python and therefore the Maya Api help is a bit hard to understand/ translate to Python for me.
Thanks in advance for any help and insights in this matter!
-Cornelius

[codebox]
def postConstructor(self): #in my node-class
thisNode = self.thisMObject()
msg = ???
cID = OpenMaya.MNodeMessage.addAttributeChangedCallback(thisNode, attrChangedCB(msg))
print cID #Testing

def attrChangedCB(msg): #outside of my class
print msg #for test purposes
if msg == OpenMaya.MNodeMessage.kAttributeSet:
print "Test"[/codebox]