Passing parameter to a pyqt thread when started

Question

Is there any way we can pass a parameter to QThread when the thread is started (.start) ?

I found an example of using pyqt thread in stackoverflow, but I was wondering h

Answer 1

You can not pass argument to run but you can pass argument to it's constructor like this:

class TaskThread(QtCore.QThread):
    notifyProgress = QtCore.pyqtSignal(int)
    def __init__(self, myvar, parent=None):
        QThread.__init__(self, parent)
        self.myvar = myvar
    def run(self):
        #use self.myvar in your run 
        for i in range(101):
            self.notifyProgress.emit(i)
            time.sleep(0.1)

and in the MyCustomWidget class:

class MyCustomWidget(QtGui.QWidget):

    def __init__(self, parent=None):
        super(MyCustomWidget, self).__init__(parent)
        layout = QtGui.QVBoxLayout(self)       

        self.progressBar = QtGui.QProgressBar(self)
        self.progressBar.setRange(0,100)
        button = QtGui.QPushButton("Start", self)
        layout.addWidget(self.progressBar)
        layout.addWidget(button)

        button.clicked.connect(self.onStart)
        ##############################################################
        #and pass your argumetn to it's constructor here
        self.myLongTask = TaskThread(myvar=myargument)
        ##############################################################
        self.myLongTask.notifyProgress.connect(self.onProgress)


    def onStart(self):
        self.myLongTask.start()

    def onProgress(self, i):
        self.progressBar.setValue(i)