有没有办法在PyQt5中从QThread返回数据类
有没有办法在PyQt5中从QThread返回数据类
提问于 2021-11-03 13:06:35
我正在尝试使用PyQt5更新QThread中的数据类，但是我似乎不知道如何从线程返回更新后的类。我试过finished = pyqtSignal(dataclass)，finished = pyqtSignal(class)，finished = pyqtSignal(<class>)等，但它们似乎都不起作用。
下面是一段精简的代码，应该是可重现的。
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_())在PyQt5中从QThread返回数据类是可能的吗？
回答 1
Stack Overflow用户
回答已采纳
发布于 2021-11-03 15:01:45
数据类类似于任何类，因此必须使用类的名称。另一方面，您连接的是QThread的finished信号，而不是worker。
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_())页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/69825378
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