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 [PyQt] enviremont refresh
#1
Hello,

I'm very new to python and pyqt5 ....
I've a thread running some code that changes the background color of some labels (+/- 1 second interval); after a few time the color change stops and only if I resize the main window they start again.
Does anybody faced a problem like this ? I did not print the code as it is a bit long ...
Thanks
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#2
Show your code, can't help much without
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#3
Hello, here it is (the application makes a connection to a siemens plc and reads some data
thanks for your help

--main code ---

import sys, time
from PyQt5.QtWidgets import QApplication
from utils import config
from ui import appWindow
from threading import Thread


def main():
    app=QApplication(sys.argv)
    app.aboutToQuit.connect(myExit)	
    cfg = config()
    cfg.log('application starts')
    if not cfg.configFile():
        myExit()
    window = appWindow()
    window.setupFonts()
    window.show()

    t = Thread(target=window.work, args=(cfg.plcIp,))
    t.start()
    sys.exit(app.exec_())

def myExit():
    print ('closing ...')
    try:
        appWindow.stopComms = True
    except:
        pass
    time.sleep (3)

if __name__ == "__main__":
    main()
-- file ui.py --- I suspect the problem is here.
from PyQt5.QtWidgets import QWidget
from design import Ui_Form
from PyQt5.QtGui import QFont
from PyQt5 import QtCore
from S7talk import *
import time, os, sys


class appWindow(QWidget, Ui_Form):
	stopComms = False

	def __init__(self):
		super().__init__()
		self.setupUi(self)
		self.setWindowTitle('Monitor')

	def setupFonts(self):
		try:
			self.setStyleSheet('background-color:black')    # window background color

			font1=QFont('Arial', 20, QFont.Light)
			font2=QFont('Arial', 50, QFont.Light)
			font3=QFont('Arial', 70, QFont.Light)
			font4=QFont('Arial', 80, QFont.Light)

			self.lblTagOk.setFont(font3)
			self.lblTagNok.setFont(font3)
			self.lblTagTempoMedio.setFont(font3)
			self.lblTagOk.setStyleSheet('color:white')
			self.lblTagNok.setStyleSheet('color:white')
			self.lblTagTempoMedio.setStyleSheet('color:white')

			self.lblOk.setFont(font4)
			self.lblNok.setFont(font4)
			self.lblTempoMedio.setFont(font4)
			self.lblInfo.setFont(font1)
			self.lblOk.setStyleSheet('color:green')
			self.lblNok.setStyleSheet('color:red')
			self.lblTempoMedio.setStyleSheet('color:blue')
			self.lblInfo.setStyleSheet('color:white')

			self.lblTagTempoMedio.setText("T.Med:")

			self.setWindowFlags(QtCore.Qt.Window | QtCore.Qt.WindowTitleHint | QtCore.Qt.CustomizeWindowHint | QtCore.Qt.WindowCloseButtonHint)
		except:
			print ('error:' + sys.exc_info()[0])

	def work(self, ip):
		statusOK = 255
		statusShutdown = 1
		statusRestart = 2
		statusReconnect = 0
		plc = S7ToPy()
		self.ip = ip

		try:
			if plc.connectToS7(self.ip):
				doWork = True
			else:
				doWork = False
		except:
			doWork = False

		plc.status = statusOK

		while not appWindow.stopComms:
			try:
				self.lblInfo.setText('')
				time.sleep(0.3)
				if not doWork:  # or plc.status == statusReconnect:
					try:
						if plc.connectToS7(self.ip):
							doWork = True
						else:
							if plc.s7IsConnected(): plc.pcClient.disconnect()
							self.errorComms('PLC Connection FAILED')
							print('PLC Connection FAILED')
							doWork = False
					except:
						if plc.s7IsConnected(): plc.pcClient.disconnect()
						self.errorComms('PLC Connection FAILED')
						print('PLC Connection FAILED')
						doWork = False
				# caso esteja tudo bem
				if doWork:
					if plc.readFromS7():
						if plc.status == statusShutdown:
							os.system('sudo halt')
							print('halt')
							break
						if plc.status == statusRestart:
							os.system('sudo reboot')
							print('reboot')
							break

						# atualiza os resultados
						self.lblOk.setText(str(plc.valueOk))
						self.lblNok.setText(str(plc.valueNok))
						self.lblTempoMedio.setText(str(plc.valueTempoMedio))

						bits = int(plc._semafores)
						self.setWindowTitle(str(bits) + ' --- ' + str(plc.valueOk))

						if bits == 1:
							self.lblSemaforeVerde.setVisible(True)
							self.lblSemaforeAmarelo.setVisible(False)
							self.lblSemaforeVermelho.setVisible(False)
						elif bits == 2:
							self.lblSemaforeVerde.setVisible(False)
							self.lblSemaforeAmarelo.setVisible(True)
							self.lblSemaforeVermelho.setVisible(False)
						elif bits == 4:
							self.lblSemaforeVerde.setVisible(False)
							self.lblSemaforeAmarelo.setVisible(False)
							self.lblSemaforeVermelho.setVisible(True)
						else:
							self.lblSemaforeVerde.setVisible(False)
							self.lblSemaforeAmarelo.setVisible(False)
							self.lblSemaforeVermelho.setVisible(False)

						self.lblInfo.setText('PLC Connection OK')
						self.lblInfo.setStyleSheet("color:green")
					else:
						if plc.s7IsConnected(): plc.pcClient.disconnect()
						self.errorComms('Error reading PLC')
						print('Error reading PLC')
						if plc.s7IsConnected(): plc.pcClient.disconnect()
						doWork = False
				else:
					time.sleep(0.3)
				time.sleep(0.3)
			except:
				print ('error:' + sys.exc_info()[0])

	def errorComms(self, msg):
		self.lblInfo.setText(msg)
		self.lblInfo.setStyleSheet('color:red')
		time.sleep(1)
-- utils.py
import sys, os
from pathlib import Path
import datetime

class config:
    def __init__(self):
        self._plcIpAddress = ''

    """ properties """
    @property
    def plcIp(self):
        return self._plcIpAddress

    @plcIp.setter
    def plcIp(self, value):
        self._plcIpAddress = value

    """ writes in the log file """
    def log (self, text):
        pathname = os.path.dirname(sys.argv[0])
        my_file = Path(pathname + "/log.txt")
        now = datetime.datetime.now()
        strText = now.strftime("%Y-%m-%d %H:%M:%S") + " ->  " + text + "\n"
        try:
            if my_file.exists():
                size = my_file.stat().st_size
                if size > 32000:
                    my_file.open('w').write(strText)
                else:
                    my_file.open('a').write(strText)
            else:
                my_file.write_text(strText)
        except:
            ex = str(sys.exc_info()[0])

    """ application quits """
    def bye(self):
        self.log ('quiting')

    """ read configuration file """
    def configFile(self):
        pathname = os.path.dirname(sys.argv[0])
        my_file = Path(pathname + "/config.txt")
        try:
            if not my_file.exists():
                return False

            txt = my_file.read_text()
            lines = txt.splitlines()
            self.plcIp = lines[0]
            if len(self.plcIp.split('.')) != 4:
                self.log ("error -> wrong ip address" + '\n')
                return False
            return True
        except:
            ex = str(sys.exc_info()[0])
            return False
-- S7talk.py

"""comms with plc
/*
 * int16 - OK -> bytes 0 e 1
 * int16 - NOK -> bytes 2 e 3
 * int16 - Semafores -> bytes 4 e 5
 * int32 - Tempo medio -> bytes 6, 7, 8 e 9
 * byte - status -> byte 10
 * 			255 - tudo ok
 * 			0 - shutdown me
 */
"""
from snap7 import client
from struct import unpack


class S7ToPy:
    def __init__(self):
        self._ok = 0
        self._nok = 0
        self._tempo = 0
        self._st = 0
        self._semafores = 0

        self._bytesToRead = 11

        self.pcClient = client.Client()

    """ properties """
    @property
    def valueOk(self):
        return self._ok

    @valueOk.setter
    def valueOk(self, value):
        self._ok = value

    @property
    def valueNok(self):
        return self._nok

    @valueNok.setter
    def valueNok(self, value):
        self._nok = value

    @property
    def valueTempoMedio(self):
        return self._tempo

    @valueTempoMedio.setter
    def valueTempoMedio(self, value):
        self._tempo = value

    @property
    def valueSemafores(self):
        return self._semafores

    @valueSemafores.setter
    def valueSemafores(self, value):
        self._semafores = value

    @property
    def status(self):
        return self._st

    @status.setter
    def status(self, value):
        self._st = value

    def s7IsConnected(self):
        return self.pcClient.get_connected()
        
    def connectToS7 (self, ip):
        try:
            self.pcClient.connect(ip,0,1)
            if self.pcClient.get_connected():
                return True
            else:
                return False
        except: return False

    def readFromS7(self):
        buf = []
        try:
            buf = self.pcClient.db_read(100,0,self._bytesToRead)
            self.valueOk = buf[0] * 256
            self.valueOk += buf[1]
            #print (buf)

            self.valueNok = buf [2] * 256
            self.valueNok += buf[3]

            self.valueSemafores = buf[4] * 256
            self.valueSemafores += buf[5]

            hexbytes = buf[6:10]
            floatValue = (unpack(">f", hexbytes))[0] # big endian
            floatValue = round(floatValue,1)
            self.valueTempoMedio = str(floatValue)
            self.valueTempoMedio = self.valueTempoMedio.replace('.', ',') + ' (s)'

            self.status = buf[10]

            return True
        except:
            return False
--design.py

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'design.ui'
#
# Created by: PyQt5 UI code generator 5.5.1
#
# WARNING! All changes made in this file will be lost!

from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(909, 571)
        self.verticalLayout_4 = QtWidgets.QVBoxLayout(Form)
        self.verticalLayout_4.setObjectName("verticalLayout_4")
        self.horizontalLayout_4 = QtWidgets.QHBoxLayout()
        self.horizontalLayout_4.setObjectName("horizontalLayout_4")
        self.verticalLayout_2 = QtWidgets.QVBoxLayout()
        self.verticalLayout_2.setObjectName("verticalLayout_2")
        self.horizontalLayout = QtWidgets.QHBoxLayout()
        self.horizontalLayout.setObjectName("horizontalLayout")
        self.lblTagOk = QtWidgets.QLabel(Form)
        self.lblTagOk.setObjectName("lblTagOk")
        self.horizontalLayout.addWidget(self.lblTagOk)
        self.lblOk = QtWidgets.QLabel(Form)
        self.lblOk.setAlignment(QtCore.Qt.AlignCenter)
        self.lblOk.setObjectName("lblOk")
        self.horizontalLayout.addWidget(self.lblOk)
        self.verticalLayout_2.addLayout(self.horizontalLayout)
        self.horizontalLayout_2 = QtWidgets.QHBoxLayout()
        self.horizontalLayout_2.setObjectName("horizontalLayout_2")
        self.lblTagNok = QtWidgets.QLabel(Form)
        self.lblTagNok.setObjectName("lblTagNok")
        self.horizontalLayout_2.addWidget(self.lblTagNok)
        self.lblNok = QtWidgets.QLabel(Form)
        self.lblNok.setAlignment(QtCore.Qt.AlignCenter)
        self.lblNok.setObjectName("lblNok")
        self.horizontalLayout_2.addWidget(self.lblNok)
        self.verticalLayout_2.addLayout(self.horizontalLayout_2)
        self.horizontalLayout_3 = QtWidgets.QHBoxLayout()
        self.horizontalLayout_3.setObjectName("horizontalLayout_3")
        self.lblTagTempoMedio = QtWidgets.QLabel(Form)
        self.lblTagTempoMedio.setObjectName("lblTagTempoMedio")
        self.horizontalLayout_3.addWidget(self.lblTagTempoMedio)
        self.lblTempoMedio = QtWidgets.QLabel(Form)
        self.lblTempoMedio.setAlignment(QtCore.Qt.AlignCenter)
        self.lblTempoMedio.setObjectName("lblTempoMedio")
        self.horizontalLayout_3.addWidget(self.lblTempoMedio)
        self.verticalLayout_2.addLayout(self.horizontalLayout_3)
        self.horizontalLayout_4.addLayout(self.verticalLayout_2)
        self.verticalLayout_3 = QtWidgets.QVBoxLayout()
        self.verticalLayout_3.setSizeConstraint(QtWidgets.QLayout.SetDefaultConstraint)
        self.verticalLayout_3.setObjectName("verticalLayout_3")
        self.lblSemaforeVermelho = QtWidgets.QLabel(Form)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Preferred)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.lblSemaforeVermelho.sizePolicy().hasHeightForWidth())
        self.lblSemaforeVermelho.setSizePolicy(sizePolicy)
        self.lblSemaforeVermelho.setStyleSheet("border-color: rgb(0, 0, 0);\n"
"border-width: 3px;        \n"
"border-style: solid;\n"
"border-radius: 40px;\n"
"margin:20px;\n"
"padding:30px;\n"
"background-color: red;\n"
"")
        self.lblSemaforeVermelho.setObjectName("lblSemaforeVermelho")
        self.verticalLayout_3.addWidget(self.lblSemaforeVermelho)
        self.lblSemaforeAmarelo = QtWidgets.QLabel(Form)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Preferred)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.lblSemaforeAmarelo.sizePolicy().hasHeightForWidth())
        self.lblSemaforeAmarelo.setSizePolicy(sizePolicy)
        self.lblSemaforeAmarelo.setStyleSheet("border-color: rgb(0, 0, 0);\n"
"border-width: 3px;        \n"
"border-style: solid;\n"
"border-radius: 40px;\n"
"margin:20px;\n"
"padding:30px;\n"
"background-color: yellow;\n"
"")
        self.lblSemaforeAmarelo.setObjectName("lblSemaforeAmarelo")
        self.verticalLayout_3.addWidget(self.lblSemaforeAmarelo)
        self.lblSemaforeVerde = QtWidgets.QLabel(Form)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Preferred)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.lblSemaforeVerde.sizePolicy().hasHeightForWidth())
        self.lblSemaforeVerde.setSizePolicy(sizePolicy)
        self.lblSemaforeVerde.setStyleSheet("border-color: rgb(0, 0, 0);\n"
"border-width: 3px;        \n"
"border-style: solid;\n"
"border-radius: 40px;\n"
"margin:20px;\n"
"padding:30px;"
"background-color: green;")
        self.lblSemaforeVerde.setObjectName("lblSemaforeVerde")
        self.verticalLayout_3.addWidget(self.lblSemaforeVerde)
        self.horizontalLayout_4.addLayout(self.verticalLayout_3)
        self.verticalLayout_4.addLayout(self.horizontalLayout_4)
        spacerItem = QtWidgets.QSpacerItem(20, 40, QtWidgets.QSizePolicy.Minimum, QtWidgets.QSizePolicy.Expanding)
        self.verticalLayout_4.addItem(spacerItem)
        self.horizontalLayout_5 = QtWidgets.QHBoxLayout()
        self.horizontalLayout_5.setObjectName("horizontalLayout_5")
        self.lblInfo = QtWidgets.QLabel(Form)
        self.lblInfo.setStyleSheet("")
        self.lblInfo.setText("")
        self.lblInfo.setObjectName("lblInfo")
        self.horizontalLayout_5.addWidget(self.lblInfo)
        self.verticalLayout_4.addLayout(self.horizontalLayout_5)

        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Form"))
        self.lblTagOk.setText(_translate("Form", "OK:"))
        self.lblOk.setText(_translate("Form", "000"))
        self.lblTagNok.setText(_translate("Form", "NOT:"))
        self.lblNok.setText(_translate("Form", "000"))
        self.lblTagTempoMedio.setText(_translate("Form", "T. MED:"))
        self.lblTempoMedio.setText(_translate("Form", "000"))
        self.lblSemaforeVermelho.setText(_translate("Form", "Sinalizador"))
        self.lblSemaforeAmarelo.setText(_translate("Form", "Sinalizador"))
        self.lblSemaforeVerde.setText(_translate("Form", "Sinalizador"))
--
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