在PyQt5中，在弹出QMessageBox后，新父级处于不同的q线程中。
在PyQt5中，在弹出QMessageBox后，新父级处于不同的q线程中。
提问于 2018-11-10 11:55:31
这是PyQt5代码。我要倒数5秒，每1秒更新一次。然后应用程序将弹出QMessageBox。
但由于QMessageBox的原因，它将在单击QObject::setParent: Cannot set parent, new parent is in a different thread按钮后关闭，
详细代码如下：
from PyQt5 import QtCore, QtGui, QtWidgets
import sys, time
from _thread import *
class ThreadClass(QtCore.QThread):
# Create the signal
sig = QtCore.pyqtSignal(int)
def __init__(self, mw, parent=None):
self.mw = mw
self.mbox = QtWidgets.QMessageBox()
super().__init__(parent)
self.sig.connect(self.showtime)
def showtime(self, t):
self.mw.label.setText(str(t))
def run(self):
for t in range(5):
self.sig.emit(t)
time.sleep(1)
self.mbox.about(QtWidgets.QMainWindow(), "Title", "Finished")
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(253, 181)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setObjectName("centralwidget")
self.pushButton = QtWidgets.QPushButton(self.centralwidget)
self.pushButton.setGeometry(QtCore.QRect(90, 100, 75, 23))
self.pushButton.setObjectName("pushButton")
self.label = QtWidgets.QLabel(self.centralwidget)
self.label.setGeometry(QtCore.QRect(20, 20, 211, 16))
self.label.setObjectName("label")
self.tc = ThreadClass(self)
self.pushButton.clicked.connect(lambda: self.tc.start())
#self.pushButton.clicked.connect(lambda: start_new_thread(showtime, (self.label, )))
MainWindow.setCentralWidget(self.centralwidget)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
self.pushButton.setText("Show")
self.label.setText("Time")
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
ex = Ui_MainWindow()
w = QtWidgets.QMainWindow()
ex.setupUi(w)
w.show()
sys.exit(app.exec_())在QMessageBox上点击按钮和下面的错误信息之后，App将关闭。
QBasicTimer::stop: Failed. Possibly trying to stop from a different thread
QBasicTimer::stop: Failed. Possibly trying to stop from a different thread
QBasicTimer::stop: Failed. Possibly trying to stop from a different thread
QBasicTimer::stop: Failed. Possibly trying to stop from a different thread
QObject::setParent: Cannot set parent, new parent is in a different thread
QObject::setParent: Cannot set parent, new parent is in a different thread回答 1
Stack Overflow用户
回答已采纳
发布于 2018-11-10 12:26:10
试一试：
import sys #, time
from PyQt5 import QtCore, QtGui, QtWidgets
from _thread import *
class ThreadClass(QtCore.QThread):
# Create the signal
sig = QtCore.pyqtSignal(int)
finish = QtCore.pyqtSignal() # +++
def __init__(self, mw, parent=None):
# self.mw = mw
# self.mbox = QtWidgets.QMessageBox()
super().__init__(parent)
# self.sig.connect(self.showtime)
# def showtime(self, t):
# self.mw.label.setText(str(t))
def run(self):
for t in range(5):
self.sig.emit(t)
#time.sleep(1)
QtCore.QThread.msleep(1000)
self.finish.emit() # +++
# self.mbox.about(QtWidgets.QMainWindow(), "Title", "Finished")
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(253, 181)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setObjectName("centralwidget")
self.pushButton = QtWidgets.QPushButton(self.centralwidget)
self.pushButton.setGeometry(QtCore.QRect(90, 100, 75, 23))
self.pushButton.setObjectName("pushButton")
self.label = QtWidgets.QLabel(self.centralwidget)
self.label.setGeometry(QtCore.QRect(20, 20, 211, 16))
self.label.setObjectName("label")
self.tc = ThreadClass(self)
self.pushButton.clicked.connect(lambda: self.tc.start())
#self.pushButton.clicked.connect(lambda: start_new_thread(showtime, (self.label, )))
self.tc.sig.connect(self.showtime) # +++
self.tc.finish.connect(self.finishTime) # +++
MainWindow.setCentralWidget(self.centralwidget)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
self.pushButton.setText("Show")
self.label.setText("Time")
# +++
def showtime(self, t):
self.label.setText(str(t))
# +++
def finishTime(self):
self.mbox = QtWidgets.QMessageBox()
self.mbox.about(QtWidgets.QMainWindow(), "Title", "Finished")
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
w = QtWidgets.QMainWindow()
ex = Ui_MainWindow()
ex.setupUi(w)
w.show()
sys.exit(app.exec_())
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/53238682
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