Pyqt-qobject::connect:cannot Queue arguments ... Error

Problem

Source:

Class Windows (Qtgui.qwidget): # Creates a widget containing: #-a Qlineedit (status_widget) #-a button, Connec Ted to On_run_clicked def on_run_clicked (self): def update (text): self.widget.setText (text) th Reading. Thread (Target=run, args= (update,)). Start ()

But if you change Qlineedit to Qtextedit, and you use the Append method, you get the following error:

Qobject::connect:cannot queue arguments of type ' qtextcursor '

(Make sure ' qtextcursor ' is registered using Qregistermetatype ().)

Solution

We cannot modify the UI through threads, and the more secure way to modify the user interface is to send a signal to the UI window (signal), and the simpler way is to use 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 ... Error