maya python 定时器多线程问题

在maya实现一下python定时器线程控制

不过简单的可行，建立物体等操作会有崩溃问题发生

并报出 r6025 pure virtual function call或者'Cannot convert data of type string[] to type string

然后就崩溃了

但是平常的移动之类没什么问题

可以用来刷新一些东西

另外这种方法不会阻塞maya的主线程，也就是说你可以一边操作一边看

以下代码操作注意有可能会导致maya崩溃

import threading as thd
import time
import maya.cmds as cmds

global aaa
aaa = 1
def fn():
global aaa
aaa += 1
cmds.polySphere(n='mySphere'+str(aaa),sx=1, sy=1, r=1)
cmds.select( clear=True )
thd.Timer(1,fn).start()

fn()

上面的就会崩溃

下面的就不会，估计是创建的问题（需要新建一个叫sphere的物体）

import threading as thd
import time
import maya.cmds as cmds

global aaa
aaa = 1
def fn():
global aaa
aaa += 1
cmds.setAttr( 'sphere.translateX', aaa )
cmds.select( clear=True )
thd.Timer(1,fn).start()

fn()

然后下面是可以使用的定时器，但是关闭后无法重开

from threading import Timer,Thread,Event
import time

class myTimer():

def __init__(self,t,hFunction):
self.t=t
self.hFunction = hFunction
self.thread = Timer(self.t,self.handle_function)

def handle_function(self):
self.hFunction()
self.thread = Timer(self.t,self.handle_function)
self.thread.start()

def start(self):
self.thread.start()

def cancel(self):
self.thread.cancel()

def printer():
print time.time()

t = myTimer(1,printer)
def defaultButtonPush(*args):
print 'shenmifangke.'
def defaultButtonPush2(*args):
t.start()
def defaultButtonPush3(*args):
t.cancel()
cmds.window( width=150 )
cmds.columnLayout( adjustableColumn=True )
cmds.button( label='test', command=defaultButtonPush )
cmds.button( label='开启',  command=defaultButtonPush2)
cmds.button( label='关闭',  command=defaultButtonPush3 )
cmds.showWindow()

后来网上查到这个是可以使用的，这个在cancel后可以重开

from threading import Timer
import time

class InfiniteTimer():
"""A Timer class that does not stop, unless you want it to."""

def __init__(self, seconds, target):
self._should_continue = False
self.is_running = False
self.seconds = seconds
self.target = target
self.thread = None

def _handle_target(self):
self.is_running = True
self.target()
self.is_running = False
self._start_timer()

def _start_timer(self):
if self._should_continue: # Code could have been running when cancel was called.
self.thread = Timer(self.seconds, self._handle_target)
self.thread.start()

def start(self):
if not self._should_continue and not self.is_running:
self._should_continue = True
self._start_timer()
else:
print("Timer already started or running, please wait if you're restarting.")

def cancel(self):
if self.thread is not None:
self._should_continue = False # Just in case thread is running and cancel fails.
self.thread.cancel()
else:
print("Timer never started or failed to initialize.")

def tick():
cmds.polySphere(r=True)
print('shenmifangke')

# Example Usage
t = InfiniteTimer(1.5, tick)
t.start()

但是测试后发现很容易崩溃
这是什么原因呢

import threading
import time
import maya.utils as utils

def example(interval, ):
global run_timer = True
def your_function_goes_here():
cmds.polySphere(r=True)

while run_timer:
time.sleep(interval)
utils.executeDeferred(your_function_goes_here)
# always use executeDeferred or evalDeferredInMainThreadWithResult if you're running a thread in Maya!

t = threading.Thread(None, target = example, args = (1,) )
t.start()


然后又找到了上面的代码，完全不会崩溃
原因就是

executeDeferred

作者代码里也写到了

这个就是在建立物体后没有延迟和maya产生的冲突使得maya崩溃了

然后上面代码当然能进行改造了

参考网址
https://stackoverflow.com/questions/12435211/python-threading-timer-repeat-function-every-n-seconds https://stackoverflow.com/questions/21164697/how-to-execute-a-maya-mel-procedure-at-regular-intervals http://download.autodesk.com/global/docs/maya2012/zh_cn/index.html?url=files/Python_Python_in_Maya.htm,topicNumber=d28e683677