事件循环已经在运行 [英] The event loop is already running
问题描述
我有以下 5 个文件:
I have the following 5 files:
gui.py
# -*- coding: utf-8 -*-
from PyQt4 import QtCore, QtGui
try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
def _fromUtf8(s):
return s
try:
_encoding = QtGui.QApplication.UnicodeUTF8
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig)
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName(_fromUtf8("MainWindow"))
MainWindow.resize(385, 365)
sizePolicy = QtGui.QSizePolicy(QtGui.QSizePolicy.Preferred, QtGui.QSizePolicy.Preferred)
sizePolicy.setHorizontalStretch(0)
sizePolicy.setVerticalStretch(0)
sizePolicy.setHeightForWidth(MainWindow.sizePolicy().hasHeightForWidth())
MainWindow.setSizePolicy(sizePolicy)
MainWindow.setMinimumSize(QtCore.QSize(385, 365))
MainWindow.setMaximumSize(QtCore.QSize(385, 365))
self.centralwidget = QtGui.QWidget(MainWindow)
self.centralwidget.setEnabled(True)
self.centralwidget.setMinimumSize(QtCore.QSize(385, 318))
self.centralwidget.setMaximumSize(QtCore.QSize(385, 318))
self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
self.verticalLayout = QtGui.QVBoxLayout(self.centralwidget)
self.verticalLayout.setSizeConstraint(QtGui.QLayout.SetDefaultConstraint)
self.verticalLayout.setObjectName(_fromUtf8("verticalLayout"))
self.textEdit = QtGui.QTextEdit(self.centralwidget)
self.textEdit.setObjectName(_fromUtf8("textEdit"))
self.verticalLayout.addWidget(self.textEdit)
self.pushButton_1 = QtGui.QPushButton(self.centralwidget)
self.pushButton_1.setObjectName(_fromUtf8("pushButton_1"))
self.verticalLayout.addWidget(self.pushButton_1)
self.pushButton_2 = QtGui.QPushButton(self.centralwidget)
self.pushButton_2.setObjectName(_fromUtf8("pushButton_2"))
self.verticalLayout.addWidget(self.pushButton_2)
self.pushButton_3 = QtGui.QPushButton(self.centralwidget)
self.pushButton_3.setObjectName(_fromUtf8("pushButton_3"))
self.verticalLayout.addWidget(self.pushButton_3)
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtGui.QMenuBar(MainWindow)
self.menubar.setEnabled(False)
self.menubar.setGeometry(QtCore.QRect(0, 0, 385, 24))
self.menubar.setObjectName(_fromUtf8("menubar"))
MainWindow.setMenuBar(self.menubar)
self.statusbar = QtGui.QStatusBar(MainWindow)
self.statusbar.setEnabled(False)
self.statusbar.setObjectName(_fromUtf8("statusbar"))
MainWindow.setStatusBar(self.statusbar)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow", None))
self.pushButton_1.setText(_translate("MainWindow", "Start a thread", None))
self.pushButton_2.setText(_translate("MainWindow", "Toggle Timer", None))
self.pushButton_3.setText(_translate("MainWindow", "Exit", None))
函数.py
import variables, logging
def initialize():
variables.lock.acquire()
try:
pass
finally:
variables.lock.release()
def refreshgui():
import start
if variables.threadcounter != 0:
start.myapp.ui.textEdit.setText(variables.globalstring + ' with ' + str(variables.threadcounter) + ' running threads' + '\nCounter: ' + str(variables.counter) + ' seconds')
else:
start.myapp.ui.textEdit.setText('String not submitted' + ' with ' + str(variables.threadcounter) + ' running threads' + '\nCounter: ' + str(variables.counter) + ' seconds')
variables.counter += 1
threadhandler.py
threadhandler.py
import variables, functions, threading
def variablesinitialize():
t = threading.Thread(name='Variables initialize', target=variables.initialize)
t.start()
t.join()
def functionsinitialize():
t = threading.Thread(name='Functions initialize', target=functions.initialize)
t.start()
t.join()
变量.py
import logging, threading
def initialize():
global globalstring, counter, threadcounter, lock
lock = threading.Lock()
lock.acquire()
try:
logging.basicConfig(level=logging.INFO, format='%(asctime)s (%(threadName)-2s) %(message)s', datefmt='%d/%m/%Y %H:%M:%S')
globalstring = 'No Success'
counter = 0
threadcounter = 0
finally:
lock.release()
和 start.py
# -*- coding: utf-8 -*-
import sys
from PyQt4 import QtCore, QtGui
from gui import Ui_MainWindow
import threadhandler, functions
class StartQT4(QtGui.QMainWindow):
def __init__(self, parent=None):
QtGui.QWidget.__init__(self, parent)
self.ui = Ui_MainWindow()
self.ui.setupUi(self)
QtCore.QObject.connect(self.ui.pushButton_1,QtCore.SIGNAL("clicked()"), exit)
QtCore.QObject.connect(self.ui.pushButton_2,QtCore.SIGNAL("clicked()"), exit)
QtCore.QObject.connect(self.ui.pushButton_3,QtCore.SIGNAL("clicked()"), exit)
app = QtGui.QApplication(sys.argv)
myapp = StartQT4()
myapp.show()
threadhandler.variablesinitialize()
threadhandler.functionsinitialize()
timer = QtCore.QTimer()
timer.timeout.connect(functions.refreshgui)
timer.start(1000)
sys.exit(app.exec_())
<小时>
执行 start.py 后,我收到消息:QCoreApplication:exec:事件循环已经在运行"
我发现,它与计时器有关
I figured out, that it has something to do with the timer
timer = QtCore.QTimer()
timer.timeout.connect(functions.refreshgui)
timer.start(1000)
出start.py和函数
def refreshgui():
import start
if variables.threadcounter != 0:
start.myapp.ui.textEdit.setText(variables.globalstring + ' with ' + str(variables.threadcounter) + ' running threads' + '\nCounter: ' + str(variables.counter) + ' seconds')
else:
start.myapp.ui.textEdit.setText('String not submitted' + ' with ' + str(variables.threadcounter) + ' running threads' + '\nCounter: ' + str(variables.counter) + ' seconds')
variables.counter += 1
出functions.py
有人可以向我解释问题是什么吗?我不知道代码有什么问题...
Could someone explain to me what the problem is? I don't know what's wrong with the code...
推荐答案
我认为问题出在你的 start.py 文件上.您有一个重新导入 start.py 的函数 refreshgui
I think the problem is with your start.py file. You have a function refreshgui which re imports start.py
import 将运行文件中代码的每一部分.通常将主要功能包装在 ''if __name__ == '__main__' 中:以防止代码在导入时运行.
import will run every part of the code in the file. It is customary to wrap the main functionality in an ''if __name__ == '__main__': to prevent code from being run on import.
每当您有多个 QApplication 或 QCoreApplication 时,就会出现错误.
The error you are getting happens everytime you have more than one QApplication or QCoreApplication.
if __name__ == '__main__': # only executes the below code if it python has run it as the main
app = QtGui.QApplication(sys.argv) # before this was getting called twice
myapp = StartQT4()
myapp.show()
threadhandler.variablesinitialize()
threadhandler.functionsinitialize()
timer = QtCore.QTimer()
timer.timeout.connect(functions.refreshgui) # I believe this re-imports start.py which calls all of this code again.
timer.start(1000)
sys.exit(app.exec_())
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