在Maya中正确使用PySide QThread以避免硬崩溃 [英] Proper PySide QThread use in Maya to avoid hard crash
问题描述
我正在尝试使用QThreads在Maya中更新自定义工具基于Qt的UI.我有一个线程，该线程可以执行任意方法，并通过发出的信号返回结果，然后使用该信号来更新我的UI.这是我自定义的QThread类:
I'm attempting to use QThreads to update my custom tool's Qt-based UI inside of Maya. I have a thread that executes arbitrary methods and returns the result via an emitted signal, which I then use to update my UI. Here's my custom QThread class:
from PySide import QtCore
class Thread(QtCore.QThread):
result = QtCore.Signal(object)
def __init__(self, parent, method, **kwargs):
super(Thread, self).__init__(parent)
self.parent = parent
self.method = method
self.kwargs = kwargs
def run(self):
result = self.method(**self.kwargs)
self.result.emit(result)
我传递给线程的方法是从网址获取序列化数据的基本请求，例如:
The methods I'm passing to the thread are basic requests for getting serialized data from a web address, for example:
import requests
def request_method(address):
request = requests.get(address)
return request.json()
这是我在自定义工具中使用线程动态更新UI的方式:
And here is how I use the thread in my custom tool to dynamically update my UI:
...
thread = Thread(parent=self, method=request_method, address='http://www.example.com/')
thread.result.connect(self._slot_result)
thread.start()
def _slot_result(self, result):
# Use the resulting data to update some UI element:
self.label.setText(result)
...
此工作流程可在其他DCC(例如Nuke)中使用，但由于某些原因，它有时会导致Maya崩溃并不一致.没有错误信息，没有日志，只是严重的崩溃.
This workflow works in other DCCs like Nuke, but for some reason it causes Maya to sometimes crash inconsistently. No error message, no log, just a hard crash.
这使我认为我的QThread工作流程设计显然不适合Maya.有什么想法可以最好地避免在使用QThreads时使Maya崩溃，以及什么可能导致此特定问题?
This makes me think that my QThread workflow design is obviously not Maya-friendly. Any ideas how best to avoid crashing Maya when using QThreads and what may be causing this particular issue?
推荐答案
我们工作室的一位工程师发现了一些与使用Python线程和PyQt/PySide有关的错误.请参考:
One of the engineers at our studio discovered a few bugs related to the use of Python threads and PyQt/PySide. Please refer to:
- [PySide 1.x] https://bugreports.qt.io/browse/PYSIDE -810
- [PySide 2.x] https://bugreports.qt.io/browse/PYSIDE -813
- [PySide 1.x] https://bugreports.qt.io/browse/PYSIDE-810
- [PySide 2.x] https://bugreports.qt.io/browse/PYSIDE-813
记者的笔记:
尽管QObject是可重入的，但GUI类(尤其是QWidget及其所有子类)不是可重入的.只能在主线程中使用它们.
Although QObject is reentrant, the GUI classes, notably QWidget and all its subclasses, are not reentrant. They can only be used from the main thread.
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