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PYQT5開啟多個線程和窗口,多線程與多窗口的交互實例

更新時間：2019年12月13日 15:20:19 作者：liqkjm

今天小編就為大家分享一篇PYQT5開啟多個線程和窗口,多線程與多窗口的交互實例，具有很好的參考價值，希望對大家有所幫助。一起跟隨小編過來看看吧

每點(diǎn)擊一次按鈕,彈出一個對話框(子窗口),同時開啟一個子線程來執(zhí)行任務(wù)并更新對話框內(nèi)容,關(guān)閉對話框則關(guān)閉對應(yīng)子線程

1. 建立一個簡單的主界面和一個自定義對話框

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", "多線程彈窗"))


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. 每點(diǎn)擊一次按鈕,打開一個彈窗

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. 打開彈窗的同時,打開一個子線程,更新對話框中的進(jìn)度條

在子線程定義信號,關(guān)聯(lián)對話框更新進(jìn)度條的槽函數(shù)

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) # 更新進(jìn)度條


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) # 關(guān)聯(lián)
  self.thread.start()


class RunThread(QThread):
 update_pb = pyqtSignal(int) # 定義更新進(jìn)度條的信號

 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. 關(guān)閉對話框,則關(guān)閉對應(yīng)子線程

在對話框中添加自定義信號,并重寫關(guān)閉事件,在關(guān)閉窗口時發(fā)送關(guān)閉子線程的信號

class DialogWindow(QDialog, Ui_Dialog):
 stop_thread = pyqtSignal() # 定義關(guān)閉子線程的信號

 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. 使用線程池QThreadPool管理子線程

使用QThreadPool, 線程需要繼承QRunnable,而QRunnable只是namespace,沒有繼承QT的信號機(jī)制,

所以需要另外繼承QObject來使用信號,我這里直接在線程中使用封裝的信號向外部傳遞信息

class DialogWindow(QDialog, Ui_Dialog):
 stop_thread = pyqtSignal() # 定義關(guān)閉子線程的信號

 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) # 設(shè)置最大線程數(shù)

 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) # 線程池分配一個線程運(yùn)行該任務(wù)


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


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

 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沒有釋放正在運(yùn)行的線程的方法

以上這篇PYQT5開啟多個線程和窗口,多線程與多窗口的交互實例就是小編分享給大家的全部內(nèi)容了，希望能給大家一個參考，也希望大家多多支持腳本之家。

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