有没有办法从 PyQt5 中的 QThread 返回数据类

Question

我正在尝试使用 PyQt5 更新 QThread 中的数据类，但我似乎无法弄清楚如何从线程返回更新后的类。 我尝试过finished = pyqtSignal(dataclass)、finished = pyqtSignal(class)、finished = pyqtSignal(<class>) 等，但它们似乎都不起作用。

以下是一段应可重现的精简代码。

import sys
from dataclasses import dataclass

from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *

@dataclass
class info():
    fname : str = "8888"
    lname : str = "8888"

class testThread(QObject):
    finished = pyqtSignal()

    def __init__(self, data):
        super().__init__()

        self.data = data
        print(data)

    def run(self):
        print("Update dataclass")

        self.data.fname = "Bob"
        self.data.lname = "Alob"

        self.finished.emit(self.data)


class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        self.data = info()

        self.setWindowTitle("My App")
        self.resize(200, 200)

        self.lblOne = QLabel("Old Text", self)
        self.lblOne.move(40, 20)
        self.lblOne.resize(100,100)

        self.lblTwo = QLabel("Old Text", self)
        self.lblTwo.move(40, 40)
        self.lblTwo.resize(100,100)

        self.btn = QPushButton("Update Labels", self)
        self.btn.move(40, 100)
        self.btn.clicked.connect(self.runThread)

    def runThread(self):
        self.thread = QThread()
        self.worker = testThread(self.data)
        self.worker.moveToThread(self.thread)
        self.thread.started.connect(self.worker.run)
        self.worker.finished.connect(self.thread.quit)
        self.worker.finished.connect(self.worker.deleteLater)
        self.thread.finished.connect(self.thread.deleteLater)
        self.thread.start()

        self.thread.finished.connect(lambda: self.evt_onFinished(data))

    def evt_onFinished(self):
        "Update the labels with the information from the returned/updated dataclass"""

if __name__ == "__main__":
    app = QApplication(sys.argv)
    mnuMain = MainWindow()
    mnuMain.show()
    sys.exit(app.exec_())

是否可以从 PyQt5 中的 QThread 返回数据类？

Answer 1

数据类与任何类一样，因此您必须使用类的名称。另一方面，您连接的是 QThread 的完成信号而不是工作线程。

import sys
from dataclasses import dataclass


from PyQt5.QtCore import pyqtSignal, QObject, QThread
from PyQt5.QtWidgets import QApplication, QLabel, QMainWindow, QPushButton


@dataclass
class Info:
    fname: str = "8888"
    lname: str = "8888"


class testThread(QObject):
    finished = pyqtSignal(Info)

    def __init__(self, data):
        super().__init__()

        self.data = data
        print(data)

    def run(self):
        print("Update dataclass")
        self.data.fname = "Bob"
        self.data.lname = "Alob"
        self.finished.emit(self.data)


class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        self.setWindowTitle("My App")
        self.resize(200, 200)

        self.lblOne = QLabel("Old Text", self)
        self.lblOne.move(40, 20)
        self.lblOne.resize(100, 100)

        self.lblTwo = QLabel("Old Text", self)
        self.lblTwo.move(40, 40)
        self.lblTwo.resize(100, 100)

        self.btn = QPushButton("Update Labels", self)
        self.btn.move(40, 100)
        self.btn.clicked.connect(self.runThread)

    def runThread(self):
        data = Info()
        self.thread = QThread()
        self.worker = testThread(data)
        self.worker.moveToThread(self.thread)
        self.thread.started.connect(self.worker.run)
        self.worker.finished.connect(self.evt_onFinished)
        self.worker.finished.connect(self.thread.quit)
        self.worker.finished.connect(self.worker.deleteLater)
        self.thread.finished.connect(self.thread.deleteLater)
        self.thread.start()

    def evt_onFinished(self, data):
        self.lblOne.setText(data.fname)
        self.lblTwo.setText(data.lname)


if __name__ == "__main__":
    app = QApplication(sys.argv)
    mnuMain = MainWindow()
    mnuMain.show()
    sys.exit(app.exec_())