Python 中发出的信号导致退出代码 139

Question

我正在尝试制作函数，它将 8 个值传递给使用 QtDesigner 制作的 window 应用程序中的进度条。那就是有一个函数可以实际生成这个值。我想每秒执行一次以获得这些值并更新显示值的进度条。

我结合了有关使用 Python 制作图形应用程序和制作具有动态更新进度条的应用程序的教程：

Python Qt 开发：https://www.youtube.com/watch?v=eD91nE8q8Nk
带线程的 PyQt 进度条：https://www.youtube.com/watch?v=ivcxZSHL7jM

问题是值传递正确，但是在发送信号时，整个应用程序崩溃并显示消息：

Process finished with exit code 139 (interrupted by signal 11: SIGSEGV)

这是我的代码：

生成值的模块 (probkowanie.py):

import time
from random import randint
import threading

def getSignals():
    time.sleep(1)
    signals = (randint(0, 100), randint(0, 100), randint(0, 100), randint(0, 100), randint(0, 100), randint(0, 100), randint(0, 100), randint(0, 100), )
    return signals

这是主要程序代码：

#!/usr/bin/env python
# -*- coding: utf-8 -*-

from PySide.QtCore import *
from PySide.QtGui import *
from PyQt4 import QtCore
import sys
import time

import signalPreview # window library
import probkowanie # values generating library

class MainDialog(QDialog, signalPreview.Ui_mainDialog):

    def __init__(self, parent=None):
        super(MainDialog, self).__init__(parent)
        self.setupUi(self)
        self.threadclass = ThreadClass()
        self.threadclass.start()
        self.connect(self.threadclass, QtCore.SIGNAL('MYO_SIGNALS'), self.updateProgressBars)

    def updateProgressBars(self, signals):
        self.progressBar.setValue(signals[0])

class ThreadClass(QtCore.QThread):
    def __init__(self, parent = None):
        super(ThreadClass, self).__init__(parent)

    def run(self):
        while 1:
            signals = probkowanie.getSignals()
            self.emit(QtCore.SIGNAL('MYO_SIGNALS'), 5) # this line causes crash
            print signals # it works correctly

app = QApplication(sys.argv)
form = MainDialog()
form.show()
app.exec_()

我觉得可能是库混用造成的。我使用 PySide 的 QtCore，尽管第 2 号教程是基于 PyQt4 的。我的决定是因为 1 号教程基于 PySide。我尝试更改：

from PySide import QtCore

至

from PyQt4 import QtCore

但是我又遇到了一堆错误，我不知道该怎么办：

Traceback (most recent call last):
   File "/usr/lib/pycharm/helpers/pydev/pydevd.py", line 1580, in <module>
        globals = debugger.run(setup['file'], None, None, is_module)
   File "/usr/lib/pycharm/helpers/pydev/pydevd.py", line 964, in run
        pydev_imports.execfile(file, globals, locals)  # execute the script
   File "/mnt/Grubas/Projekty/Biomed/MYO/myo.py", line 36, in <module>
        form = MainDialog()
   File "/mnt/Grubas/Projekty/Biomed/MYO/myo.py", line 20, in __init__
        self.connect(self.threadclass, QtCore.SIGNAL('MYO_SIGNALS'), self.updateProgressBars)
   TypeError: 'PySide.QtCore.QObject.connect' called with wrong argument types:
   PySide.QtCore.QObject.connect(ThreadClass, str, instancemethod)
   Supported signatures:
   PySide.QtCore.QObject.connect(PySide.QtCore.QObject, str, callable, PySide.QtCore.Qt.ConnectionType = Qt.AutoConnection)
   PySide.QtCore.QObject.connect(PySide.QtCore.QObject, PySide.QtCore.QMetaMethod, PySide.QtCore.QObject, PySide.QtCore.QMetaMethod, PySide.QtCore.Qt.ConnectionType = Qt.AutoConnection)
   PySide.QtCore.QObject.connect(PySide.QtCore.QObject, str, PySide.QtCore.QObject, str, PySide.QtCore.Qt.ConnectionType = Qt.AutoConnection)
   PySide.QtCore.QObject.connect(PySide.QtCore.QObject, str, str, PySide.QtCore.Qt.ConnectionType = Qt.AutoConnection)   PySide.QtCore.QObject.connect(str, callable, PySide.QtCore.Qt.ConnectionType = Qt.AutoConnection)
   PySide.QtCore.QObject.connect(str, PySide.QtCore.QObject, str, PySide.QtCore.Qt.ConnectionType = Qt.AutoConnection)

@编辑在提供由@ekhumoro 脚本提出的更改后不会崩溃，但现在我收到另一个错误：

QObject::connect: Cannot queue arguments of type 'object' (Make sure 'object' is registered using qRegisterMetaType().)

我试图自己寻找解决方案，但没有找到我需要的确切代码。我还尝试将信号类型从（对象）转换为（元组）或（列表），但它会导致另一个错误：

TypeError: Unknown type used to call meta function (that may be a signal): tuple

我找到的大多数解决方案都是基于 PyQT 的。有没有一种简单的方法可以为 PySide 重写它？这是一个解决方案示例，它似乎是正确的，但使用 PyQT 制作：

Answer 1

您认为混合 PySide 和 PyQt 会导致问题是正确的，因此您需要删除其中一个。但是，崩溃本身可能是由 PySide 中的错误引起的。这里有一个类似问题的 SO 问题：

所以你还需要改变你定义和发射的方式MYO_SIGNALS。

以下是您的脚本的固定版本（更改的行已注释）：

# from PySide.QtCore import *
# from PySide.QtGui import *
# from PyQt4 import QtCore
from PyQt4.QtCore import *
from PyQt4.QtGui import *
import sys
import time

import signalPreview # window library
import probkowanie # values generating library

class MainDialog(QDialog):

    def __init__(self, parent=None):
        super(MainDialog, self).__init__(parent)
        self.setupUi(self)
        self.threadclass = ThreadClass()
        self.threadclass.start()
        # self.connect(self.threadclass, QtCore.SIGNAL('MYO_SIGNALS'), self.updateProgressBars)
        self.connect(self.threadclass, SIGNAL('MYO_SIGNALS'), self.updateProgressBars)

    def updateProgressBars(self, signals):
        self.progressBar.setValue(signals[0])

# class ThreadClass(QtCore.QThread):
class ThreadClass(QThread):
    def __init__(self, parent = None):
        super(ThreadClass, self).__init__(parent)

    def run(self):
        while 1:
            signals = probkowanie.getSignals()
            # self.emit(QtCore.SIGNAL('MYO_SIGNALS'), 5) # this line causes crash
            self.emit(SIGNAL('MYO_SIGNALS'), signals)
            print signals # it works correctly

app = QApplication(sys.argv)
form = MainDialog()
form.show()
app.exec_()

Python 中发出的信号导致退出代码 139

Signal emitting in Python causes exit code 139

python

multithreading

pyside

signals-slots

qthread