PYQT5开启多个线程和窗口，多线程与多窗口的交互

PYQT5（python）开启多个线程和窗口，多线程与多窗口的交互

每点击一次按钮,弹出一个对话框(子窗口),同时开启一个子线程来执行任务并更新对话框内容,关闭对话框则关闭对应子线程

1. 建立一个简单的主界面和一个自定义对话框

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(327, 303)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.gridLayout = QtWidgets.QGridLayout(self.centralwidget)
        self.gridLayout.setObjectName("gridLayout")
        spacerItem = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.gridLayout.addItem(spacerItem, 0, 0, 1, 1)
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setObjectName("pushButton")
        self.gridLayout.addWidget(self.pushButton, 0, 1, 1, 1)
        spacerItem1 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.gridLayout.addItem(spacerItem1, 0, 2, 1, 1)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 327, 23))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        self.pushButton.clicked.connect(MainWindow.open_dialog)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "多线程弹窗"))


class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName("Dialog")
        Dialog.resize(369, 128)
        self.gridLayout = QtWidgets.QGridLayout(Dialog)
        self.gridLayout.setObjectName("gridLayout")
        self.buttonBox = QtWidgets.QDialogButtonBox(Dialog)
        self.buttonBox.setOrientation(QtCore.Qt.Horizontal)
        self.buttonBox.setStandardButtons(QtWidgets.QDialogButtonBox.Cancel|QtWidgets.QDialogButtonBox.Ok)
        self.buttonBox.setObjectName("buttonBox")
        self.gridLayout.addWidget(self.buttonBox, 1, 0, 1, 1)
        self.progressBar = QtWidgets.QProgressBar(Dialog)
        self.progressBar.setProperty("value", 24)
        self.progressBar.setObjectName("progressBar")
        self.gridLayout.addWidget(self.progressBar, 0, 0, 1, 1)

        self.retranslateUi(Dialog)
        self.buttonBox.accepted.connect(Dialog.accept)
        self.buttonBox.rejected.connect(Dialog.reject)
        QtCore.QMetaObject.connectSlotsByName(Dialog)

    def retranslateUi(self, Dialog):
        _translate = QtCore.QCoreApplication.translate
        Dialog.setWindowTitle(_translate("Dialog", "Dialog"))

2. 每点击一次按钮,打开一个弹窗

class DialogWindow(QDialog, Ui_Dialog):
    def __init__(self, parent=None):
        super(DialogWindow, self).__init__(parent)
        self.setupUi(self)


class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.setupUi(self)

    def open_dialog(self):
        dialog = DialogWindow(self)
        dialog.show()


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

3. 打开弹窗的同时,打开一个子线程,更新对话框中的进度条

在子线程定义信号,关联对话框更新进度条的槽函数

class DialogWindow(QDialog, Ui_Dialog):
    def __init__(self, parent=None):
        super(DialogWindow, self).__init__(parent)
        self.setupUi(self)

    def update_progressbar(self, p_int):
        self.progressBar.setValue(p_int)  # 更新进度条


class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.setupUi(self)
        self.count = 0

    def open_dialog(self):
        dialog = DialogWindow(self)
        dialog.show()
        self.thread = RunThread(self.count)
        self.count += 1
        self.thread.update_pb.connect(dialog.update_progressbar)  # 关联
        self.thread.start()


class RunThread(QThread):
    update_pb = pyqtSignal(int)  # 定义更新进度条的信号

    def __init__(self, count):
        super().__init__()
        self.count = count

    def run(self):
        for i in range(100):
            print('thread%s' % self.count, i, QThread().currentThreadId())
            self.update_pb.emit(i)
            time.sleep(1)
        pass


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

4. 关闭对话框,则关闭对应子线程

在对话框中添加自定义信号,并重写关闭事件,在关闭窗口时发送关闭子线程的信号

class DialogWindow(QDialog, Ui_Dialog):
    stop_thread = pyqtSignal()  # 定义关闭子线程的信号

    def __init__(self, parent=None):
        super(DialogWindow, self).__init__(parent)
        self.setupUi(self)

    def update_progressbar(self, p_int):
        self.progressBar.setValue(p_int)

    def closeEvent(self, event):
        self.stop_thread.emit()
        pass


class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.setupUi(self)
        self.count = 0

    def open_dialog(self):
        dialog = DialogWindow(self)
        dialog.show()
        self.thread = RunThread(self.count)
        self.count += 1
        self.thread.update_pb.connect(dialog.update_progressbar)
        dialog.stop_thread.connect(self.thread.terminate)
        self.thread.start()


class RunThread(QThread):
    update_pb = pyqtSignal(int)

    def __init__(self, count):
        super().__init__()
        self.count = count

    def run(self):
        for i in range(1, 101):
            print('thread_%s' % self.count, i, QThread().currentThreadId())
            self.update_pb.emit(i)
            time.sleep(1)
        pass


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

5. 使用线程池QThreadPool管理子线程

使用QThreadPool, 线程需要继承QRunnable,而QRunnable只是namespace,没有继承QT的信号机制,
所以需要另外继承QObject来使用信号,我这里直接在线程中使用封装的信号向外部传递信息

class DialogWindow(QDialog, Ui_Dialog):
    stop_thread = pyqtSignal()  # 定义关闭子线程的信号

    def __init__(self, parent=None):
        super(DialogWindow, self).__init__(parent)
        self.setupUi(self)

    def update_progressbar(self, p_int):
        self.progressBar.setValue(p_int)

    def closeEvent(self, event):
        self.stop_thread.emit()
        pass


class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.setupUi(self)
        self.count = 0
        self.pool = QThreadPool()
        self.pool.globalInstance()
        self.pool.setMaxThreadCount(10)  # 设置最大线程数

    def open_dialog(self):
        dialog = DialogWindow(self)
        dialog.show()
        thread = RunThread(self.count)
        self.count += 1
        thread.signal.update_pb.connect(dialog.update_progressbar)
        # dialog.stop_thread.connect(thread.stop)
        # self.thread.start()
        self.pool.start(thread)  # 线程池分配一个线程运行该任务


class Signal(QObject):
    update_pb = pyqtSignal(int)


class RunThread(QRunnable):
    def __init__(self, count):
        super().__init__()
        self.count = count
        self.signal = Signal()  # 信号

    def run(self):
        for i in range(1, 101):
            print('thread_%s' % self.count, i, QThread().currentThreadId())
            self.signal.update_pb.emit(i)
            time.sleep(1)


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

QThreadPool没有释放正在运行的线程的方法