[英]Cannot get a QAbstractListModel subclass working on PySide2 without a hack
[英]PySide2 : cannot close a QMessageBox without quitting the APP
这是一个小代码,我有一个线程连接到 ftp 服务器并显示消息框。 我不明白为什么只要关闭msgBoxWait
对话框,应用程序就会崩溃(在 FTP 线程之前终止)。
我想这是因为它是最后一个显示的窗口,但是,添加 QEventLoop 并不能解决它。 你能帮助我吗 ?
# coding: utf-8
import sys
import random
from PySide2 import QtCore, QtWidgets, QtGui
class Logic():
def __init__(self):
self.msgBoxWait = QtWidgets.QMessageBox()
self.ftpThread = FtpThread()
self.isConnected = False
self.loop = QtCore.QEventLoop()
def run(self):
self.ftpThread.sigIsConnected.connect(self.ftpConnected, QtCore.Qt.QueuedConnection)
self.ftpThread.finished.connect(self.ftpFinished, QtCore.Qt.QueuedConnection)
self.ftpThread.sigError.connect(self.ftpError, QtCore.Qt.QueuedConnection)
self.ftpThread.start()
QtCore.QTimer.singleShot(200, self.showWaitMsgBox)
self.loop.exec_()
def showWaitMsgBox(self):
self.msgBoxWait.setWindowTitle("Waiting")
self.msgBoxWait.setText("""Waiting for ftp connection""")
if not self.isConnected:
self.msgBoxWait.exec()
def ftpConnected(self):
print("connected")
self.isConnected = True
self.msgBoxWait.close() # <- crash here or when I click on the close button
def ftpFinished(self):
print("finished")
self.ftpThread = None
self.loop.quit()
def ftpError(self, title, message):
QtWidgets.QMessageBox.critical(None, title, message)
class FtpThread(QtCore.QThread):
sigIsConnected = QtCore.Signal()
sigError = QtCore.Signal(str, str)
def run(self):
QtCore.QThread.sleep(2)
self.sigIsConnected.emit()
QtCore.QThread.sleep(1)
self.sigError.emit("error", "An error appened")
QtCore.QThread.sleep(3)
if __name__ == "__main__":
app = QtWidgets.QApplication([])
logic = Logic()
QtCore.QTimer.singleShot(0, logic.run)
sys.exit(app.exec_())
默认情况下,Qt 被配置为如果最后一个窗口关闭,应用程序将结束,因为这通常是预期的行为,但这不是您的情况,因为有时即使没有打开的窗口,您也需要继续运行。 解决方案是将quitOnLastWindowClosed
属性设置为 False:
# coding: utf-8
import sys
import random
from PySide2 import QtCore, QtWidgets, QtGui
class Logic:
def __init__(self):
self.msgBoxWait = QtWidgets.QMessageBox()
self.ftpThread = FtpThread()
self.isConnected = False
def run(self):
self.ftpThread.sigIsConnected.connect(
self.ftpConnected, QtCore.Qt.QueuedConnection
)
self.ftpThread.finished.connect(self.ftpFinished, QtCore.Qt.QueuedConnection)
self.ftpThread.sigError.connect(self.ftpError, QtCore.Qt.QueuedConnection)
self.ftpThread.start()
QtCore.QTimer.singleShot(200, self.showWaitMsgBox)
def showWaitMsgBox(self):
self.msgBoxWait.setWindowTitle("Waiting")
self.msgBoxWait.setText("""Waiting for ftp connection""")
if not self.isConnected:
self.msgBoxWait.exec()
def ftpConnected(self):
print("connected")
self.isConnected = True
self.msgBoxWait.close()
def ftpFinished(self):
print("finished")
self.ftpThread = None
# QtCore.QCoreApplication.quit() should be used # to close the entire application if necessary QtCore.QCoreApplication.quit()
def ftpError(self, title, message):
QtWidgets.QMessageBox.critical(None, title, message)
class FtpThread(QtCore.QThread):
sigIsConnected = QtCore.Signal()
sigError = QtCore.Signal(str, str)
def run(self):
QtCore.QThread.sleep(2)
self.sigIsConnected.emit()
QtCore.QThread.sleep(1)
self.sigError.emit("error", "An error appened")
QtCore.QThread.sleep(3)
if __name__ == "__main__":
app = QtWidgets.QApplication([])
app.setQuitOnLastWindowClosed(False)
logic = Logic()
QtCore.QTimer.singleShot(0, logic.run)
sys.exit(app.exec_())
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