QObject：无法为不同线程中的父级创建子级。 PyQt5
[英]QObject: Cannot create children for a parent that is in a different thread. PyQt5
问题描述
When I try to change the text of a text browser which is inside a scroll area I get this PyQt5 threading error:
当我尝试更改滚动区域内的文本浏览器的文本时，出现此 PyQt5 线程错误：
QObject: Cannot create children for a parent that is in a different thread.
(Parent is QTextDocument(0x212e3bb1f50), parent's thread is QThread(0x212e171e220), current thread is QThread(0x212e41dc7e0)
I assume it is because of the scroll area and that I don't have access to it from the thread I am trying to change this from and it works if I put the same bit of code...我认为这是因为滚动区域，我无法从我试图更改它的线程访问它，如果我输入相同的代码，它就可以工作......
filepath = "..."
with open(filepath, "r") as f:
contents = f.read()
#print(contents)
self.log_1.setText(contents)
(and yes I am aware that the filepath is "...", used for file security.)...inside the thread that the scrollarea is created inside it works completely fine. （是的，我知道文件路径是“...”，用于文件安全性。）...在创建滚动区域的线程内部完全可以正常工作。
The only thing I don't know is how to fix this.我唯一不知道的是如何解决这个问题。 I think you might be able to inherit the thread to the scroll area in someway, idk.我认为您可能能够以某种方式将线程继承到滚动区域，idk。
My code, but simplified:我的代码，但简化了：
from PyQt5 import QtCore, QtGui, QtWidgets
from mcstatus import MinecraftServer
import threading
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(1379, 523)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setObjectName("centralwidget")
self.scrollArea_1 = QtWidgets.QScrollArea(self.S1)
self.scrollArea_1.setGeometry(QtCore.QRect(0, 20, 981, 341))
self.scrollArea_1.setWidgetResizable(True)
self.scrollArea_1.setObjectName("scrollArea_1")
self.scrollAreaWidgetContents_1 = QtWidgets.QWidget()
self.scrollAreaWidgetContents_1.setGeometry(QtCore.QRect(0, 0, 979, 339))
self.scrollAreaWidgetContents_1.setObjectName("scrollAreaWidgetContents_1")
self.log_1 = QtWidgets.QTextBrowser(self.scrollAreaWidgetContents_1)
self.log_1.setGeometry(QtCore.QRect(0, 0, 981, 341))
self.log_1.setMinimumSize(QtCore.QSize(981, 341))
self.log_1.viewport().setProperty("cursor",
QtGui.QCursor(QtCore.Qt.IBeamCursor))
self.log_1.setObjectName("log_1")
self.scrollArea_1.setWidget(self.scrollAreaWidgetContents_1)
def update1(self, MainWindow):
threading.Timer(0.2, self.update1, {MainWindow: MainWindow}).start()
ip = "..."
port = 25565 #Server 1
server = MinecraftServer(ip, port)
try:
filepath = "..."
with open(filepath, "r") as f:
contents = f.read()
#print(contents)
self.log_1.setText(contents)
except IOError as e:
self.StatusL_1.setText(self.translate("MainWindow", "<html><head/><body><p><span style=\" font-size:18pt;\">Status: Off</span></p></body></html>"))
else:
self.StatusL_1.setText(self.translate("MainWindow", "<html><head/><body><p><span style=\" font-size:18pt;\">Status: On</span></p></body></html>"))
1 个解决方案
解决方案1
1 已采纳 2020-05-16 20:36:44
You should not directly modify the GUI from another thread, one way to modify the GUI indirectly from another thread is to use the Qt signals:您不应该直接从另一个线程修改 GUI，从另一个线程间接修改 GUI 的一种方法是使用 Qt 信号：
import threading
from PyQt5 import QtCore, QtGui, QtWidgets
from mcstatus import MinecraftServer
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
# ...
class Worker(QtCore.QObject):
logged = QtCore.pyqtSignal(str)
statusChanged = QtCore.pyqtSignal(bool)
def start(self):
threading.Timer(0.2, self._execute, daemon=True).start()
def _execute(self):
threading.Timer(0.2, self._execute, daemon=True).start()
ip = "..."
port = 25565 # Server 1
server = MinecraftServer(ip, port)
try:
filepath = "..."
with open(filepath, "r") as f:
contents = f.read()
self.logged.emit(contents)
except IOError as e:
self.statusChanged.emit(False)
else:
self.statusChanged.emit(True)
class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
def __init__(self, parent=None):
super().__init__(parent)
self.setupUi(self)
self.worker = Worker()
self.worker.logged.connect(self.log_1.setText)
self.worker.statusChanged.connect(self.on_status_changed)
self.worker.start()
@QtCore.pyqtSlot(bool)
def on_status_changed(self, status):
text = '<html><head/><body><p><span style=" font-size:18pt;">Status: {}</span></p></body></html>'.format(
"On" if status else "Off"
)
self.StatusL_1.setText(text)
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = MainWindow()
w.show()
sys.exit(app.exec_())
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.