在运行PyQt5 GUI显示其他窗口后，为什么会出现RuntimeError：QPlainTextEdit类型的包装C / C ++对象已被删除的原因

问题描述

我试图让用户从GUI中选择要执行的过程。没有GUI部分，我可以执行这些过程，并且它们都同时出现在可以独立运行的单独窗口上。现在，我希望用户从GUI中选择首先运行哪个过程，以避免同时打开多个窗口。当我选择第二个按钮时程序正常执行时，出现以下错误消息： RuntimeError：QPlainTextEdit类型的包装C / C ++对象已被删除 。我已经解决了这个问题，并尝试了所提出的建议，但没有成功。在从 [https://stackoverflow.com/questions/63302430/call-different-window-classes-into-a-main-window-in-pqt5-python]，我试图尽量减少代码。尽管使用了某些特定的程序包，但这些程序包不负责观察到的错误，任何人都应该能够运行此代码。 Mainwindow类已经在使用Qt来显示窗口，但是当独立使用时，我没有任何错误。该错误是Ui_MainWindow（object）类所固有的，我也尝试使用项目列表进行相同的问题。选择“运行2”过程时，每次按“队列”时都会出现此错误。

import logging
log = logging.getLogger(__name__)
log.addHandler(logging.NullHandler())
import sys
import random
import pandas as pd
from pymeasure.log import console_log
from pymeasure.display.Qt import QtGui
from PyQt5 import QtCore,QtGui,QtWidgets
from pymeasure.display.windows import ManagedWindow
from pymeasure.experiment import Procedure,Results
from pymeasure.experiment import IntegerParameter,FloatParameter,Parameter
import tempfile

# this class uses the Pymeasure package to run and display experiments here it s just generating a random number. the iterations 
#number being the input parameter on the window and one can queue several runs
# execute is the method generating the random number and Mainwindow is the dipsplay and the queue of the runs. the data are
# save in a temp file

class RandomProcedure_1(Procedure):

    iterations = IntegerParameter('Loop Iterations',default=10)

    DATA_COLUMNS = ['Iteration','Random Number']
    #
    def startup(self):
        log.info("Setting the time of the random number generator")
        random.seed(self.seed)

    def execute(self):
        log.info("Starting the loop of %d iterations" % self.iterations)
        for i in range(self.iterations):
            data = {
                'Iteration': i,'Random Number': random.randint(1,50)
            }
            self.emit('results',data)
            log.debug("Emitting results: %s" % data)
            if self.should_stop():
                log.warning("Caught the stop flag in the procedure")
                break

class MainWindow_1(ManagedWindow):
# this define the window where the random number vs iteration plot is displayed
    def __init__(self):
            super(MainWindow_1,self).__init__(
                procedure_class=RandomProcedure_1,inputs=['iterations'],displays=['iterations'],x_axis='Iteration',y_axis='Random Number',)
            self.setWindowTitle('RandomProcedure_1')

    def queue(self,*,procedure=None):
        if procedure is None:
            procedure = self.make_procedure()
        filename = tempfile.mktemp()
        log.info("Constructing the Results with a data file: %s" % filename)
        results = Results(procedure,filename)
        experiment = self.new_experiment(results)
        self.manager.queue(experiment)

# the GUI with 2 pushbuttons for each procedure (here the same duplicated for simplicity)
# i also tried with a list of item but the same error occurs
class Ui_MainWindow(object):
    def setupUi(self,MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800,600)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(110,160,112,34))
        self.pushButton.setObjectName("EXP1")
        self.pushButton.clicked.connect(self.startProcedure_1)
        self.pushButton_2 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_2.setGeometry(QtCore.QRect(580,170,34))
        self.pushButton_2.setObjectName("EXP2")
        self.pushButton_2.clicked.connect(self.startProcedure_1)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0,800,21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def startProcedure_1(self):
        self.window = MainWindow_1()
        self.window.show()

    def retranslateUi(self,MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow","Procedures"))
        self.pushButton.setText(_translate("MainWindow","Run 1"))
        self.pushButton_2.setText(_translate("MainWindow","Run 2"))

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

解决方法

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