PyQt, QThread communication, update QLineEdit filed

Question

I have a piece of code that is running, communication between two threads and status. I have faced with problem how to update QLineEdit field based on emitted value. So far, it works fine with commented lines, but it's not what I am looking for... How to modify show_process function to do the job...some help will be more than welcome?

import sys, time
from PyQt4 import QtGui, QtCore

class Window(QtGui.QMainWindow):
    def __init__(self):
        super(Window, self).__init__()
        self.setGeometry(50, 50, 500, 200)
        self.setWindowTitle("TEST APP!")
        self.home()

    def Label(self, name, width, length, fontSize) :
        label_name = QtGui.QLabel(name, self)
        label_name.move(width,length)
        label_font = label_name.font() 
        label_font.setPointSize(fontSize)
        label_name.setFont(label_font)

    def Field(self, TrueFalse, width, length, startText) :
        field_name = QtGui.QLineEdit(self)
        field_name.setDisabled(TrueFalse)
        field_name.move(width, length)
        field_name.setAlignment(QtCore.Qt.AlignCenter)
        field_name.setText(startText)

    def home(self):
        self.Label('TEST1', 10, 60, 10)
        self.Label('TEST2', 10, 120, 10)
        self.Field(True, 130, 60, 'Ready') # first one
        self.Field(True, 130, 120, 'Ready') # second one

        self.start = QtGui.QPushButton("start", self)
        self.start.clicked.connect(self.startPressed)
        self.start.move(260, 20)
        self.stop = QtGui.QPushButton("Stop", self)
        self.stop.clicked.connect(self.stopPressed)
        self.stop.move(380, 20)

        self.show()

    def startPressed(self): 
        self.get_thread_start = Start_Process('239.200.10.1', 50010)
        self.stop.clicked.connect(self.get_thread_start.terminate)
        self.start.setDisabled(True)
        self.get_thread_start.updated.connect(self.show_process)

        self.get_thread_start.start()

    def stopPressed(self):
        self.start.setDisabled(False)
        self.get_thread_start.running = False

    def show_process(self, data):
        if str(data) == '1' :
            #self.textbox1.setText(str(data))
            pass
        elif str(data) == '0' :
            #self.textbox2.setText(str(data))
            pass

class Start_Process(QtCore.QThread):
    updated = QtCore.pyqtSignal(int)
    running = True

    def __init__(self, mcstaddr, mcstport):
        QtCore.QThread.__init__(self)
        self.counter = 0
        self.array = [1,0,1,0,1,0,1,0,1]

    def run(self):

        while self.running:
            for i in self.array :
                self.updated.emit(i)
                time.sleep(0.5)

def main():
    app = QtGui.QApplication(sys.argv)
    GUI = Window()
    GUI.show()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

Answer 1

A simple way to access the widget is to create a container, in this case we choose a dictionary:

self.field_dict = {}

Then we add in the Field() method we add the QLineEdits to the dictionary.

def Field(self, TrueFalse, width, length, startText, key) :
    field_name = QtGui.QLineEdit(self)
    ...
    self.field_dict[key] = field_name

Then we can get the QLineEdit through the key.

def show_process(self, key, data):
    self.field_dict[key].setText(data)

Complete Example:

import sys, time
from PyQt4 import QtGui, QtCore

class Window(QtGui.QMainWindow):
    def __init__(self):
        super(Window, self).__init__()
        self.setGeometry(50, 50, 500, 200)
        self.setWindowTitle("TEST APP!")
        self.field_dict = {}
        self.home()



    def Label(self, name, width, length, fontSize) :
        label_name = QtGui.QLabel(name, self)
        label_name.move(width,length)
        label_font = label_name.font() 
        label_font.setPointSize(fontSize)
        label_name.setFont(label_font)

    def Field(self, TrueFalse, width, length, startText, key) :
        field_name = QtGui.QLineEdit(self)
        field_name.setDisabled(TrueFalse)
        field_name.move(width, length)
        field_name.setAlignment(QtCore.Qt.AlignCenter)
        field_name.setText(startText)
        self.field_dict[key] = field_name

    def home(self):
        self.Label('TEST1', 10, 60, 10)
        self.Label('TEST2', 10, 120, 10)
        self.Field(True, 130, 60, 'Ready', 0) # first one
        self.Field(True, 130, 120, 'Ready', 1) # second one

        self.start = QtGui.QPushButton("start", self)
        self.start.clicked.connect(self.startPressed)
        self.start.move(260, 20)
        self.stop = QtGui.QPushButton("Stop", self)
        self.stop.clicked.connect(self.stopPressed)
        self.stop.move(380, 20)

        self.show()

    def startPressed(self): 
        self.get_thread_start = Start_Process('239.200.10.1', 50010)
        self.stop.clicked.connect(self.get_thread_start.terminate)
        self.start.setDisabled(True)
        self.get_thread_start.updated.connect(self.show_process)

        self.get_thread_start.start()

    def stopPressed(self):
        self.start.setDisabled(False)
        self.get_thread_start.running = False

    def show_process(self, key, data):
        self.field_dict[key].setText(data)

class Start_Process(QtCore.QThread):
    updated = QtCore.pyqtSignal(int, str)
    running = True

    def __init__(self, mcstaddr, mcstport):
        QtCore.QThread.__init__(self)
        self.counter = 0
        self.array = [1,0,1,0,1,0,1,0,1]

    def run(self):

        while self.running:
            for i in self.array :
                self.updated.emit(i, str(self.counter))
                time.sleep(0.5)
                self.counter += 1

def main():
    app = QtGui.QApplication(sys.argv)
    GUI = Window()
    GUI.show()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()