Python上Qt中的QThread

我雇用 QThread 在阅读了关于如何使用QThread的扩展讨论之后使用worker对象,并通过子类化覆盖其run方法,这不是合适的方法。但是,在我打算使用的方法中,我需要传递一个在启动线程时不可用的附加函数参数,并使用 moveToThread . 此信息(参数)在按下按钮时可用,并传达移动对象的信息。

在我的代码的完整版本中,有三个单独的控制器用于三个单独的对象,您可以在下面找到一个最小的工作示例,演示我试图传递的参数。该代码也可在 pastebin 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。这就是路线 self.thread.started.connect(self.obj.moveLeftIncrement) 然后尝试使用 槽 ,但我不太了解他们。此外,尽管使用QThread,GUI有时会挂起,并且在程序退出后会出现错误,其中一个错误如下:

我的问题如下:

1. 如何在运行时传递参数和/或使用插槽?
2. 如何防止退出时出现程序错误?
3. 为什么子类化QThread在这种情况下直接起作用,尽管不建议这样做?

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, 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), 2, 1)
        layout.addWidget(self.createButton("right", controller), 2, 3)
        layout.addWidget(self.createButton("forward", controller), 1, 2)
        layout.addWidget(self.createButton("backward", controller), 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, 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 moveForwardIncrement(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 moveBackwardIncrement(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 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_())