【问题】
源码：
class Windows(QtGui.QWidget):
# Creates a widget containing:
# - a QLineEdit (status_widget)
# - a button, connected to on_run_clicked
def on_run_clicked(self):
def update(text):
self.widget.setText(text)
threading.Thread(target=run, args=(update, )).start()
但是如果将 QLineEdit换成QTextEdit，并使用了append方法就会得到以下错误：
QObject::connect: Cannot queue arguments of type ‘QTextCursor‘
(Make sure ‘QTextCursor‘ is registered using qRegisterMetaType().)
【解决】
我们不能通过线程来修改UI，较为安全的修改用户界面的方式是向UI窗口发送信号(signal)，较为简单的方式是使用 Qt threading
class MyThread(QtCore.QThread):
updated = QtCore.pyqtSignal(str)
def run( self ):
# do some functionality
for i in range(10000):
self.updated.emit(str(i))
class Windows(QtGui.QWidget):
def __init__( self, parent = None ):
super(Windows, self).__init__(parent)
self._thread = MyThread(self)
self._thread.updated.connect(self.updateText)
# create a line edit and a button
self._button.clicked.connect(self._thread.start)
def updateText( self, text ):
self.widget.setText(text)PyQt-QObject::connect: Cannot queue arguments...报错
原文：https://www.cnblogs.com/yeu4h3uh2/p/14088263.html