PYQT5开启多个线程和窗口,多线程与多窗口的交互实例
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
fromPyQt5importQtCore,QtGui,QtWidgets
classUi_MainWindow(object):
defsetupUi(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)
defretranslateUi(self,MainWindow):
_translate=QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow","MainWindow"))
self.pushButton.setText(_translate("MainWindow","多线程弹窗"))
classUi_Dialog(object):
defsetupUi(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)
defretranslateUi(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
classDialogWindow(QDialog,Ui_Dialog): def__init__(self,parent=None): super(DialogWindow,self).__init__(parent) self.setupUi(self) classMainWindow(QtWidgets.QMainWindow,Ui_MainWindow): def__init__(self,parent=None): super(MainWindow,self).__init__(parent) self.setupUi(self) defopen_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
classDialogWindow(QDialog,Ui_Dialog):
def__init__(self,parent=None):
super(DialogWindow,self).__init__(parent)
self.setupUi(self)
defupdate_progressbar(self,p_int):
self.progressBar.setValue(p_int)#更新进度条
classMainWindow(QtWidgets.QMainWindow,Ui_MainWindow):
def__init__(self,parent=None):
super(MainWindow,self).__init__(parent)
self.setupUi(self)
self.count=0
defopen_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()
classRunThread(QThread):
update_pb=pyqtSignal(int)#定义更新进度条的信号
def__init__(self,count):
super().__init__()
self.count=count
defrun(self):
foriinrange(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
classDialogWindow(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)
defupdate_progressbar(self,p_int):
self.progressBar.setValue(p_int)
defcloseEvent(self,event):
self.stop_thread.emit()
pass
classMainWindow(QtWidgets.QMainWindow,Ui_MainWindow):
def__init__(self,parent=None):
super(MainWindow,self).__init__(parent)
self.setupUi(self)
self.count=0
defopen_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()
classRunThread(QThread):
update_pb=pyqtSignal(int)
def__init__(self,count):
super().__init__()
self.count=count
defrun(self):
foriinrange(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
classDialogWindow(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)
defupdate_progressbar(self,p_int):
self.progressBar.setValue(p_int)
defcloseEvent(self,event):
self.stop_thread.emit()
pass
classMainWindow(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
defopen_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
classSignal(QObject):
update_pb=pyqtSignal(int)
classRunThread(QRunnable):
def__init__(self,count):
super().__init__()
self.count=count
self.signal=Signal()#信号
defrun(self):
foriinrange(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
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