[英]Fixing Threads in PySide2
I have programmed an application using PySide2 with some 800 lines of code and now when I want to show a variable in the progress bar it crashes after a short while without any warning.我使用 PySide2 编写了一个包含 800 行代码的应用程序,现在当我想在进度条中显示一个变量时,它会在短时间内崩溃而没有任何警告。 Silently.默默。 Just now it dawned on me that my whole approach to this GUI building is probably incorrect.刚才我突然意识到我对这个 GUI 构建的整个方法可能是不正确的。 Can this code be saved somehow so that it can via signals set this progress bar from inside the thread without the application crashing?能否以某种方式保存此代码,以便它可以通过信号从线程内部设置此进度条,而不会导致应用程序崩溃?
EDIT: this minimal code works and crashes but needs a small ui file.编辑:这个最小的代码可以工作并崩溃,但需要一个小的 ui 文件。 Just copy the second code below in a notepad and save it as "test_minim.ui".只需在记事本中复制下面的第二个代码并将其保存为“test_minim.ui”。 It crashes maybe after a minute with no warning.它可能在没有警告的情况下在一分钟后崩溃。
import time
import os
import sys
import tempfile
import pkgutil
import numpy as np
import threading
from PySide2.QtUiTools import QUiLoader
from PySide2.QtWidgets import QApplication, QPushButton, QLineEdit, QProgressBar
from PySide2.QtCore import QFile, QObject, QThread
from PySide2.QtGui import qApp
class MyMainWindow(QObject):
def __init__(self, ui_file, parent=None):
super(MyMainWindow, self).__init__(parent)
self.my_package_name = "test_minim"
self.window = self.load_ui("test_minim.ui")
self.startButton = self.window.findChild(QPushButton, 'startButton')
self.startButton.clicked.connect(self.start)
self.stopButton = self.window.findChild(QPushButton, 'stopButton')
self.stopButton.clicked.connect(self.stop)
self.colCentral = self.window.findChild(QProgressBar, 'colCentral')
self.newLSF = False
self.LSF = 0
self.run = False
def load_ui(self, filename):
# We might run from a PYZ file, but QUiLoader requires a plain file,
# so extract it to a temporary file.
temp = tempfile.NamedTemporaryFile(delete=False)
temp.write(pkgutil.get_data(self.my_package_name, filename))
temp.close()
ui_file = QFile(temp.name)
ui = QUiLoader().load(ui_file)
ui_file.close()
ui_file.remove()
return ui
def show(self):
print("Showing...")
self.window.show()
def start(self):
self.run = True
calculateLSFThread = threading.Thread(None, self.calculateLSF)
displayThread = threading.Thread(None, self.displayBar)
calculateLSFThread.start()
displayThread.start()
def calculateLSF(self):
while self.run:
time.sleep(0.3)
#some processing goes here
#takes a while to compute
self.LSF = 50 + int(80*(np.random.rand(1)-0.5))
self.newLSF = True
def displayBar(self):
while self.run == True:
if not self.newLSF:
time.sleep(0.01)
else:
self.colCentral.setValue(self.LSF)
self.newLSF = False
def stop(self):
self.run = False
def start_gui():
app = QApplication.instance()
if not app:
# Instanciate QApplication singleton if it doesn't exist. It might
# already exist, for instance starting application again in Spyder
# in the same IPython shell
app = QApplication(sys.argv)
main_window = MyMainWindow("prime_gui.ui")
main_window.show()
return app.exec_()
if __name__ == '__main__':
start_gui()
Here the ui file opened for notepad.这里为记事本打开了 ui 文件。 Needs to be saved as "test_minim.ui".需要保存为“test_minim.ui”。
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>289</width>
<height>531</height>
</rect>
</property>
<property name="windowTitle">
<string>MainWindow</string>
</property>
<property name="windowOpacity">
<double>1.000000000000000</double>
</property>
<property name="layoutDirection">
<enum>Qt::LeftToRight</enum>
</property>
<property name="animated">
<bool>false</bool>
</property>
<property name="tabShape">
<enum>QTabWidget::Rounded</enum>
</property>
<property name="dockOptions">
<set>QMainWindow::AllowTabbedDocks</set>
</property>
<widget class="QWidget" name="centralwidget">
<widget class="QPushButton" name="startButton">
<property name="geometry">
<rect>
<x>20</x>
<y>40</y>
<width>71</width>
<height>23</height>
</rect>
</property>
<property name="autoFillBackground">
<bool>false</bool>
</property>
<property name="text">
<string>Start </string>
</property>
<property name="checkable">
<bool>false</bool>
</property>
</widget>
<widget class="QPushButton" name="stopButton">
<property name="enabled">
<bool>true</bool>
</property>
<property name="geometry">
<rect>
<x>160</x>
<y>40</y>
<width>71</width>
<height>23</height>
</rect>
</property>
<property name="text">
<string>Stop</string>
</property>
</widget>
<widget class="QGroupBox" name="groupBoxMTF">
<property name="geometry">
<rect>
<x>40</x>
<y>90</y>
<width>192</width>
<height>301</height>
</rect>
</property>
<property name="title">
<string>LTF</string>
</property>
<layout class="QGridLayout" name="gridLayout_3">
<item row="0" column="0" colspan="2">
<layout class="QGridLayout" name="layoutDisplayMTF">
<item row="0" column="0">
<widget class="QProgressBar" name="colCentral">
<property name="maximum">
<number>100</number>
</property>
<property name="value">
<number>0</number>
</property>
<property name="textVisible">
<bool>true</bool>
</property>
<property name="orientation">
<enum>Qt::Vertical</enum>
</property>
<property name="invertedAppearance">
<bool>false</bool>
</property>
<property name="textDirection">
<enum>QProgressBar::TopToBottom</enum>
</property>
</widget>
</item>
</layout>
</item>
</layout>
</widget>
</widget>
<widget class="QMenuBar" name="menubar">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>289</width>
<height>21</height>
</rect>
</property>
</widget>
<widget class="QStatusBar" name="statusbar"/>
</widget>
<resources/>
<connections/>
</ui>
Kind regards亲切的问候
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