Callback not working as intended? (addTimeChangeCallback)

[Mariano Merchante]

Hey guys! I'm new around here.

I'm currently trying to calculate some things when time changes, so I tried using the following method:

MCallbackId MDGMessage::addTimeChangeCallback

(

MMessage::MTimeFunction

func, void * clientData = NULL, MStatus * ReturnStatus = NULL)

However, it seems that the callback is called without the expected clientData, but with an MTime given instead. 

Am I doing something wrong?

Snippet: 

import maya.OpenMaya as OpenMaya

def onTimeChangedCallback(*args):
print "addTimeChangeCallback:" + str(list(args))
    
def addNodeAddedCallback(*args):
print "addNodeAddedCallback:" + str(list(args))

def addForceUpdateCallback(*args):
print "addForceUpdateCallback:" + str(list(args))

OpenMaya.MDGMessage.addTimeChangeCallback(onTimeChangedCallback, "testStringTimeChanged")
OpenMaya.MDGMessage.addForceUpdateCallback(addForceUpdateCallback, "testStringForceUpdate")
OpenMaya.MDGMessage.addNodeAddedCallback(addNodeAddedCallback, "dependNode", "testStringAddNode")

The output, when moving the time slider:

addTimeChangeCallback:[<maya.OpenMaya.MTime; proxy of <Swig Object of type 'MTime *' at 0x00000000355106C0> >, <maya.OpenMaya.MTime; proxy of <Swig Object of type 'MTime *' at 0x00000000355106C0> >]
addForceUpdateCallback:[<maya.OpenMaya.MTime; proxy of <Swig Object of type 'MTime *' at 0x00000000355106C0> >, <maya.OpenMaya.MTime; proxy of <Swig Object of type 'MTime *' at 0x00000000355106C0> >]

And when adding any node, just to be sure...

polyCube -w 1 -h 1 -d 1 -sx 1 -sy 1 -sz 1 -ax 0 1 0 -cuv 4 -ch 1; objectMoveCommand;

addNodeAddedCallback:[<maya.OpenMaya.MObject; proxy of <Swig Object of type 'MObject *' at 0x00000000355106C0> >, 'testStringAddNode']

addNodeAddedCallback:[<maya.OpenMaya.MObject; proxy of <Swig Object of type 'MObject *' at 0x0000000035524360> >, 'testStringAddNode']

addNodeAddedCallback:[<maya.OpenMaya.MObject; proxy of <Swig Object of type 'MObject *' at 0x0000000035524360> >, 'testStringAddNode']

This means that the addNodeAddedCallback is working correctly, receiving a test string, while the other two callbacks are just receiving MTime two times.

Is this a bug, or am I doing something wrong here?

Thanks!

[Justin Israel]

Seems like a bug. Maybe they are returning the MTime pointer twice instead of the data pointer for the second arg. File a bug?

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[Mariano Merchante]

Yeah, I was thinking the same thing. Thanks for the quick response!

For anyone looking for a workaround: because the callback is independent of any object, you can set up a callback wrapper that tracks additional clientData through a map or similar.

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[Mahmoodreza Aarabi]

Hello guys
i know that this thread is old, but recently i was searching about one problem and i see this in group.

i do this in another way, but i have different problem that i will say.
i did this:

def do_something(*args, **kwargs):
    print "hello"

idx = OpenMaya.MEventMessage.addEventCallback("timeChanged", get_sec)

this snippet works well, but problem is that i want to get all callbacks of the current scene and remove it.
i know that the code is something like this:

OpenMaya.MMessage.removeCallback(idx)

but, finding the idx from the current scene is a problem now.

i can’t run this codes in one step, maybe i want to run the second code after a while, for example, after closing the scene again.

any idea?

thanks

​

[Marcus Ottosson]

You can temporarily store it somewhere global, such as in any of your own modules.

import my_module

# Add
my_module.idx = OpenMaya.MEventMessage.addEventCallback("timeChanged", get_sec)

# Remove
OpenMaya.MEventMessage.removeEventCallback(my_module.idx)

​

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[Mahmoodreza Aarabi]

thanks marcus

this is when i run a module in maya and in a function in it i want to remove it,
but maybe i saved the scene with this callback

restart maya and want to remove it.

what is the solution?

make sense?

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Bests,

madoodia

[Mahmoodreza Aarabi]

i mean the callback will stick to the scene or not?

i think custom callbacks does not stick to the scene.

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Bests,

madoodia

[Marcus Ottosson]

They do not, you will have to re-add it for each session.

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[Mahmoodreza Aarabi]

i think so

but removing it in the current session does not work.

i mean when i create a callback i have to find it in all callbacks and then remove it when i want.

make sense?

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Bests,

madoodia

[Mahmoodreza Aarabi]

there is any way to find all custom callbacks in a scene?

--

Bests,

madoodia

[Cesar Saez]

You don't even need an external module to save your ids in memory :)

---

from maya import OpenMaya


# setup
if not globals().get("my_callbacks"):  # this avoid overriding the ids on re-run
    my_callbacks = dict()

def addCallback(func):
    idx = OpenMaya.MEventMessage.addEventCallback("timeChanged", func)
    my_callbacks[idx] = func
    return idx

def clearCallbacks():
    for idx in my_callbacks.keys():
        OpenMaya.MEventMessage.removeCallback(idx)
    my_callbacks.clear()

# usage

def do_something(*args, **kwargs):
    print "hello"

addCallback(do_something)
addCallback(do_something)
addCallback(do_something)

print my_callbacks  # {id: func}
clearCallbacks()
print my_callbacks  # empty

[Mahmoodreza Aarabi]

Hey Cesar
nice idea

in recent hours i found a way in one module that is like your idea but with list:

callbacks = []

def do_something():
    print "anything"

def main():
    global callbacks
    idx = OpenMaya.MEventMessage.addEventCallback("timeChanged", get_sec)
    callbacks.append(idx)

def remove_callbacks():
    for call in callbacks:
        OpenMaya.MMessage.removeCallback(call)

it works fine for me

thanks man
thanks to marcus

​

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Bests,

madoodia