我正在不同的线程（由threading.Thread创建）中运行单独的类方法。我想检查用户是否成功登录。
如果用户未登录，我想提示一个消息框
QtWidgets.QMessageBox.critical(
None,
"Wrong Credentials",
"The login credentials provided in settings are wrong. Kindly edit them and restart the application"
)
错误
QObject::setParent: Cannot set parent, new parent is in a different thread
QBackingStore::endPaint() called with active painter; did you forget to destroy it or call QPainter::end() on it?
Segmentation fault (core dumped)
代码
"""
include all related imports
"""
# Code for Ui_Dialog is not important
class Application(Ui_Dialog):
def __init__(self, Dialog):
self.completer = QtWidgets.QCompleter(["days", "weeks", "months"],
Dialog)
self.recent_profiles: List[Dict[str, Union[str, WebElement]]] = []
self.parent = Dialog
Dialog.setWindowFlags(QtCore.Qt.WindowCloseButtonHint
| QtCore.Qt.WindowMinimizeButtonHint)
qtRectangle = Dialog.frameGeometry()
centerPoint = QtWidgets.QDesktopWidget().availableGeometry().center()
qtRectangle.moveCenter(centerPoint)
Dialog.move(qtRectangle.topLeft())
self.setupUi(Dialog)
self.retranslateUi(Dialog)
self.db = self.__load_db()
Thread(
target=self.__run_auto,
args=(
self.db["auto"],
self.db["email"],
self.db["password"],
)
).start()
def __run_auto(self, auto, email, password):
if not auto["predicate"] or not auto["lim"] or not auto["template"]:
QtWidgets.QMessageBox.critical("Error", "Auto recent sender is not configured") # the problem occurs here
else:
options = Options()
options.headless = False
driver: WebDriver = WebDriver()
driver.get("https://example.com/user/login")
user: WebElement = driver.find_element_by_xpath('//*[@id="username"]')
pasw: WebElement = driver.find_element_by_xpath('//*[@id="password"]')
login: WebElement = driver.find_element_by_xpath(
'/html/body/div[1]/main/div/form/div[3]/button')
user.send_keys(email)
pasw.send_keys(password)
login.click()
SUCCESS = False
try:
WebDriverWait(driver, 2).until(
EC.presence_of_element_located(
(By.XPATH,
"/html/body/div[1]/main/div/form/div[2]/div/a")))
except (NoSuchElementException, TimeoutException):
SUCCESS = True
pass
if not SUCCESS:
# the problem occurs here
QtWidgets.QMessageBox.critical(
None,
"Wrong Credentials",
"The login credentials provided in settings are wrong. Kindly edit them and restart the application"
)
driver.quit()
pass
def __load_db(self):
with open("/home/jarvis/config.json") as file:
return json.loads(file.read())
此外，如果您能告诉我如何将父线程对象传递给子线程，我将不胜感激。
您不得从另一个线程修改或创建GUI元素，而必须使用信号发送信息。另一方面，请勿从Ui_Dialog继承，因为它只是用于填充窗口小部件的类，而是必须从适当的窗口小部件继承，因此当您使用pyqtSlot装饰器时，可以确保在pyqtSlot装饰器中调用该方法。 GUI线程。
class Ui_Dialog(object):
def setupUi(self, Dialog):
# ...
def retranslateUi(self, Dialog):
# ...
class DriverWorker(QtCore.QObject):
messageChanged = QtCore.pyqtSignal(str, str)
def start(self, *args, **kwargs):
threading.Thread(
target=self.__run_auto, args=args, kwargs=kwargs, daemon=True
).start()
def __run_auto(self, auto, email, password):
if not auto["predicate"] or not auto["lim"] or not auto["template"]:
self.messageChanged.emit(
"Error", "Auto recent sender is not configured"
) # the problem occurs here
else:
options = Options()
options.headless = False
driver: WebDriver = WebDriver()
driver.get("https://example.com/user/login")
user: WebElement = driver.find_element_by_xpath('//*[@id="username"]')
pasw: WebElement = driver.find_element_by_xpath('//*[@id="password"]')
login: WebElement = driver.find_element_by_xpath(
"/html/body/div[1]/main/div/form/div[3]/button"
)
user.send_keys(email)
pasw.send_keys(password)
login.click()
SUCCESS = False
try:
WebDriverWait(driver, 2).until(
EC.presence_of_element_located(
(By.XPATH, "/html/body/div[1]/main/div/form/div[2]/div/a")
)
)
except (NoSuchElementException, TimeoutException):
SUCCESS = True
pass
if not SUCCESS:
# the problem occurs here
self.messageChanged.emit(
"Wrong Credentials",
"The login credentials provided in settings are wrong. Kindly edit them and restart the application",
)
driver.quit()
class Dialog(QtWidgets.QDialog, Ui_Dialog):
def __init__(self, parent=None):
super(Dialog, self).__init__(parent)
self.setupUi(self)
self.setWindowFlags(
QtCore.Qt.WindowCloseButtonHint | QtCore.Qt.WindowMinimizeButtonHint
)
qtRectangle = self.frameGeometry()
centerPoint = QtWidgets.QDesktopWidget().availableGeometry().center()
qtRectangle.moveCenter(centerPoint)
self.move(qtRectangle.topLeft())
self.db = self.__load_db()
self.worker = DriverWorker()
self.worker.start(self.db["auto"], self.db["email"], self.db["password"])
self.worker.messageChanged.connect(self.on_message_changed)
@QtCore.pyqtSlot(str, str)
def on_message_changed(self, title, description):
QtWidgets.QMessageBox.critical(None, title, description)
def __load_db(self):
with open("/home/jarvis/config.json") as file:
return json.loads(file.read())
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = Dialog()
w.show()
sys.exit(app.exec_())