在python中的另一个类中调用类函数

问题描述

我最近开始学习 Python + PyQt5。请帮助我理解如何在python中的另一个类中调用类函数。

我有以下代码

from PyQt5 import QtGui,QtWidgets,QtCore,uic
from PyQt5.Qt import *

class mywindow(QtWidgets.QMainWindow):
    def __init__(self):
        super().__init__()
        QtWidgets.QMainWindow.__init__(self)
        self.ui = uic.loadUi('test.ui',self)
        self.resize(820,300)
        self.setFixedSize(self.size())
        self.pushButton.clicked.connect(self.getValue)
        self.thread = {}
        self.pushButtonStart.clicked.connect(self.start_worker_1)
        self.pushButtonStop.clicked.connect(self.stop_worker_1)

    def getValue(self):
        self.value = self.spinBox.value()
        i = 1
        while i <= self.value:
            os.system('test1.py')
            i += 1
        else:
            print('End,i =',i)

    def start_worker_1(self):
        self.thread[1] = ThreadClass(parent=None,index=1)
        self.thread[1].start()
        self.pushButtonStart.setEnabled(False)
        self.pushButtonStop.setEnabled(True)

    def stop_worker_1(self):
        self.thread[1].stop()
        self.pushButtonStart.setEnabled(True)
        self.pushButtonStop.setEnabled(False)

class ThreadClass(QtCore.QThread):
    any_signal = QtCore.pyqtSignal(int)

    def __init__(self,parent=None,index=0):
        super(ThreadClass,self).__init__(parent)
        self.index = index
        self.is_running = True


    def run(self):
        print('Start...',self.index)
        a = mywindow()
        a.getValue()

    def stop(self):
        self.is_running = False
        print('Stop...',self.index)
        self.terminate()


if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    application = mywindow()
    application.show()

    sys.exit(app.exec())

我需要按照 spinBox 中指定的次数执行 test.py 文件

Start... 1
End,i = 1

如果我在 while i <= 4: 时这样做，那么它会起作用。但是如果我从 SpinBox 传递 self.value 就不起作用。 我做错了什么？

解决方法

您不必要地使您的应用程序复杂化，此外您还遇到了在每个线程中创建窗口对象的错误，这是不合逻辑的，而且禁止在另一个线程中创建小部件。

在这种情况下，最好使用 QProcess 和信号来了解脚本何时完成执行。

注意：由于没有提供 .ui，所以我将展示一个简单的例子：

test.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>180</width>
    <height>98</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <layout class="QHBoxLayout" name="horizontalLayout">
    <item>
     <widget class="QSpinBox" name="spinBox"/>
    </item>
    <item>
     <widget class="QPushButton" name="pushButton">
      <property name="text">
       <string>Start</string>
      </property>
     </widget>
    </item>
   </layout>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>180</width>
     <height>28</height>
    </rect>
   </property>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <resources/>
 <connections/>
</ui>

ma​​in.py

import os
import sys
from functools import cached_property
from pathlib import Path

from PyQt5 import QtGui,QtWidgets,QtCore,uic

CURRENT_DIRECTORY = Path(__file__).resolve().parent


class MainWindow(QtWidgets.QMainWindow):
    def __init__(self):
        super().__init__()
        self.ui = uic.loadUi(os.fspath(CURRENT_DIRECTORY / "test.ui"),self)

        self.ui.pushButton.clicked.connect(self.handle_clicked)

    @cached_property
    def manager(self):
        return Manager()

    def handle_clicked(self):
        number_of_processes = self.ui.spinBox.value()
        script = os.fspath(CURRENT_DIRECTORY / "test1.py")
        for i in range(number_of_processes):
            self.manager.execute(script,dict(i=i))


class Manager(QtCore.QObject):
    @cached_property
    def processes(self):
        return list()

    def execute(self,script,metadata=None):
        process = QtCore.QProcess()
        process.setProperty("metadata",metadata or dict())
        process.finished.connect(self.handle_finished)
        process.setProgram(sys.executable)
        process.setArguments([script])
        process.start()
        self.processes.append(process)

    def handle_finished(self):
        process = self.sender()
        self.processes.remove(process)
        metadata = process.property("metadata")
        print(f"{metadata} finished")


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)

    w = MainWindow()
    w.show()

    sys.exit(app.exec())