pyqt 多线程出现问题

复制代码
import time

from PyQt5.Qt import *


class WorkThread(QThread):
    finished=pyqtSignal()
    def __init__(self):
        super(WorkThread, self).__init__()
        self.is_running = None

    def run(self):
        print('running')
        self.is_running = True
        while self.is_running:
            print('working....')
            time.sleep(1)
            self.finished.emit()

    def stop(self):
        self.is_running = False



class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.resize(600,500)
        self.work = WorkThread()
        self.work.setParent(self)
        self.work.destroyed.connect(lambda :print('thread is destoryed'))

        self.btn = QPushButton("start")
        self.btn2 = QPushButton("stop")

        layout = QVBoxLayout()
        layout.addWidget(self.btn)
        layout.addWidget(self.btn2)

        central_widget = QWidget()
        central_widget.setLayout(layout)

        self.setCentralWidget(central_widget)

        #slots
        self.btn.clicked.connect(self.start_thread)
        self.btn2.clicked.connect(self.stop_thread)

    def start_thread(self):
        self.work.start()

    def stop_thread(self):
        self.work.stop()

    def closeEvent(self, event) -> None:
        self.work.stop()

在运行时关闭窗口时会出错的原因是,当关闭窗口时,工作线程仍然在运行,并且在调用`self.work.stop()`时,工作线程已经被销毁,但是在`stop()`方法中仍然尝试设置`self.is_running`为False,这会导致AttributeError。

为了解决这个问题,你可以在关闭窗口时先停止工作线程,然后再关闭窗口。你可以在`closeEvent`方法中添加一个判断,如果工作线程正在运行,则先停止工作线程,然后再关闭窗口。代码如下:

```python

def closeEvent(self, event):

if self.work.isRunning():

self.work.stop()

self.work.wait() # 等待工作线程结束

event.accept()

```

这样,当关闭窗口时,会先停止工作线程并等待其结束,然后再关闭窗口,避免了出错的情况。

正确代码如下:

复制代码
import time

from PyQt5.Qt import *


class WorkThread(QThread):

    def __init__(self):
        super(WorkThread, self).__init__()
        self.is_running = None

    def run(self):
        print('running')
        self.is_running = True
        while self.is_running:
            print('working....')
            time.sleep(1)
          

    def stop(self):
        self.is_running = False



class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.resize(600,500)
        self.work = WorkThread()
        self.work.setParent(self)
        self.work.destroyed.connect(lambda :print('thread is destoryed'))

        self.btn = QPushButton("start")
        self.btn2 = QPushButton("stop")

        layout = QVBoxLayout()
        layout.addWidget(self.btn)
        layout.addWidget(self.btn2)

        central_widget = QWidget()
        central_widget.setLayout(layout)

        self.setCentralWidget(central_widget)

        #slots
        self.btn.clicked.connect(self.start_thread)
        self.btn2.clicked.connect(self.stop_thread)

    def start_thread(self):
        self.work.start()

    def stop_thread(self):
        self.work.stop()

    def closeEvent(self, event) -> None:
        if self.work.isRunning():
            self.work.stop()
            self.work.wait()
            event.accept()

import time

from PyQt5.Qt import *
import time

qum_1 = QMutex()
class Thread_1(QThread):

    def __init__(self):
        super(Thread_1, self).__init__()

    def run(self):
        qum_1.lock()
        values=[1,2,3,4,5]
        for i in values:
            print(i)
            time.sleep(0.5)
        qum_1.unlock()


class Thread_2(QThread):
    _signal = pyqtSignal()

    def __init__(self):
        super(Thread_2, self).__init__()

    def run(self):
        values = ["a","b","c","d","e"]
        for i in values:
            print(i)
            time.sleep(1)
        self._signal.emit()






class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("的学习")
        self.resize(500,500)
        self.setup_ui()

        self.t=Thread_1()
        self.t2=Thread_2()
        self.t2._signal.connect(lambda :self.btn2.setEnabled(True))


    def setup_ui(self):

        self.btn = QPushButton('btn1',self)
        self.btn.move(10,20)
        self.btn.clicked.connect(self.btn_click)

        self.btn2 = QPushButton('btn2',self)
        self.btn.move(10,80)
        self.btn2.clicked.connect(self.btn2_click)


    def btn_click(self):
        self.t.start()

    def btn2_click(self):
        self.btn2.setEnabled(False)
        self.t2.start()





if __name__ == '__main__':
    import sys
    app=QApplication(sys.argv)

    win=Window()
    win.show()
    sys.exit(app.exec_())
相关推荐
qianbo_insist11 分钟前
c++ python 共享内存
开发语言·c++·python
今天背单词了吗98026 分钟前
算法学习笔记:8.Bellman-Ford 算法——从原理到实战,涵盖 LeetCode 与考研 408 例题
java·开发语言·后端·算法·最短路径问题
CoderPractice32 分钟前
C#控制台小项目-飞行棋
开发语言·c#·小游戏·飞行棋
Coding小公仔40 分钟前
LeetCode 151. 反转字符串中的单词
开发语言·c++·算法
程序猿阿伟41 分钟前
《声音的变形记:Web Audio API的实时特效法则》
开发语言·前端·php
凌览44 分钟前
有了 25k Star 的MediaCrawler爬虫库加持,三分钟搞定某红书、某音等平台爬取!
前端·后端·python
这里有鱼汤1 小时前
给你的DeepSeek装上实时行情,让他帮你炒股
后端·python·mcp
Humbunklung1 小时前
Rust方法语法:赋予结构体行为的力量
开发语言·后端·rust
萧曵 丶1 小时前
Rust 内存结构:深入解析
开发语言·后端·rust