在阅读了有关应如何使用QThread的扩展讨论并通过子类覆盖它的run方法之后,我使用了一个Worker对象来使用QThread,这是不合适的方法.但是,在我打算使用的方法中,我需要传递一个附加的函数参数,该参数在线程启动以及使用moveToThread将工作程序推入线程时不可用.该信息(参数)在按下按钮时可用,并传达有关要移动的对象的信息.

在我的代码的完整版中,有3个单独的控制器,用于3个单独的对象,您可以在下面找到一个最小的工作示例,以说明我尝试传递参数的内容.该代码也可以在pastebin上使用,并且感兴趣的行号是10-28、46-50和133-135.

到目前为止,我已经尝试在连接到worker中实际函数的行中使用lambda构造函数.那行是self.thread.started.connect(self.obj.moveLeftIncrement)然后尝试使用插槽,但是我不太了解它们.此外,尽管使用了QThread,但有时GUI仍挂起,并且在程序退出后仍会出现错误,其中之一如下：

Process finished with exit code -1073740791 (0xC0000409)

我的问题如下：

>如何在运行时传递参数和/或使用插槽？
>如何防止退出时出现程序错误？
>为什么不推荐使用子类化QThread在这种情况下直接起作用？

from PySide2.QtCore import *
from PySide2.QtWidgets import *
from PySide2.QtGui import *
import sys
import time

class Worker(QObject):
    finished = Signal(int)

    @Slot(str)
    def moveLeftIncrement(self,controller_name):
        # controller_name = "Controller 1"
        print("Controller name is ",controller_name)
        if controller_name == "Controller 1":
            print("Starting controller 1")
            time.sleep(2)
            print("Finishing sleep")
        elif controller_name == "Controller 2":
            print("Starting controller 2")
            time.sleep(2)
            print("Finishing sleep")
        elif controller_name == "Controller 3":
            print("Starting controller 3")
            time.sleep(2)
            print("Finishing sleep")
        else:
            raise Exception("No such controller found!")
        self.finished.emit(0)


class Window(QWidget):
    """ Inherits from QWidget """
    def closeEvent(self,*args,**kwargs):
        print("\nClosing")

    def __init__(self):
        super().__init__()
        self.CONTINUOUS_MOVE_SWITCH = False
        self.title = 'Control Controllers'
        self.left = 10
        self.top = 10
        self.width = 320
        self.height = 100
        self.AxesMapping = [0,1,2,3]
        self.initUI()
        self.thread = QThread()
        self.obj = Worker()
        self.obj.moveToThread(self.thread)
        self.thread.started.connect(self.obj.moveLeftIncrement)
        self.obj.finished.connect(self.thread.quit)

    def initUI(self):
        """ Initializes the GUI either using the grid layout or the absolute position layout"""
        self.setWindowTitle(self.title)
        self.setGeometry(self.left,self.top,self.width,self.height)
        Comp1 = self.createGridLayout("Controller 2")
        windowLayout = QGridLayout()

        windowLayout.addWidget(Comp1,0)
        self.setLayout(windowLayout)
        self.show()

    def createGridLayout(self,controller):
        """Creates a grid layout for the buttons"""
        Box_size = QSize(640,440)
        HGroupBox = QGroupBox(controller)
        layout = QGridLayout()
        layout.addWidget(self.createButton("left",controller),1)
        layout.addWidget(self.createButton("right",3)
        layout.addWidget(self.createButton("forward",2)
        layout.addWidget(self.createButton("backward",3,2)
        HGroupBox.setLayout(layout)
        HGroupBox.setFixedSize(Box_size)
        return HGroupBox

    def createButton(self,name,controller):
        """Creates a button with the specified size"""
        button_size = QSize(100,40)
        icon_size = 40
        button = QPushButton()
        button.Name = name
        button.Controller = controller
        button.Moving = 0
        button.clicked.connect(lambda: self.buttonPresssed(button))
        button.setFixedSize(button_size)
        return button

    def moveLeftIncrement(self,controller,button):
        if controller == "Controller 1":
            time.sleep(2)
        elif controller == "Controller 2":
            time.sleep(2)
        elif controller == "Controller 3":
            time.sleep(2)
        else:
            raise Exception("No such controller found!")

    def moveRightIncrement(self,button):
        if controller == "Controller 1":
            time.sleep(2)
        elif controller == "Controller 2":
            time.sleep(2)
        elif controller == "Controller 3":
            time.sleep(2)
        else:
            raise Exception("No such controller found!")

    def moveForwardIncrement(self,button):
        if controller == "Controller 1":
            time.sleep(2)
        elif controller == "Controller 2":
            time.sleep(2)
        elif controller == "Controller 3":
            time.sleep(2)
        else:
            raise Exception("No such controller found!")

    def moveBackwardIncrement(self,button):
        if controller == "Controller 1":
            time.sleep(2)
        elif controller == "Controller 2":
            time.sleep(2)
        elif controller == "Controller 3":
            time.sleep(2)
        else:
            raise Exception("No such controller found!")

    def buttonPresssed(self,button):
        name = button.Name
        if hasattr(button,'Controller'):
            controller = button.Controller
            print("The controller selected is",controller)
        if name == 'left':
            self.thread.start()
        elif name == 'right':
            print("Moved controller right for a single step")
            self.moveRightIncrement(controller,button)
        elif name == 'forward':
            self.moveForwardIncrement(controller,button)
            print("Moved controller forward for a single step")
        elif name == 'backward':
            self.moveBackwardIncrement(controller,button)
            print("Moved controller backward for a single step")
        elif name == "up":
            print("Moving controller up for a single step")
            self.moveUpIncrement(controller,button)
        elif name == "down":
            print("Moving controller down for a single step")
            self.moveDownIncrement(controller,button)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Window()
    sys.exit(app.exec_())