Client

Example Python program Client.py This program creates a PyQt GUI Python version 3.x or newer. To check the Python version use:

python --version

Modules

• import socket
• import sys
• import time
• from PyQt5 import QtCore, QtGui, QtWidgets
• from PyQt5.QtCore import QThread
• from klient_gui import Ui_MainWindow

Classes

• class MyForm(QtWidgets.QMainWindow):
• class Polaczenie(QtCore.QThread):

Methods

• def init(self, parent=None):
• def updateLCD(self):
• def start_linczik(self, b):
• def init(self, parent):
• def run(self):
• def event_dispatcher(self, a, b):

Code

Example Python PyQt program :

import socket
import sys
import time

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import QThread

from klient_gui import Ui_MainWindow


class MyForm(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        QtWidgets.QWidget.__init__(self, parent)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)
        # Pelen ekran
        # self.showFullScreen()
        self.showMaximized()
        self.timer = QtCore.QTimer(self)
        self.polaczenie = Polaczenie(self)
        self.polaczenie.start()
        #self.start_linczik(20)

    @QtCore.pyqtSlot()
    def updateLCD(self):
        # Update the lcd
        self.start_time -= 1
        if self.start_time >= 0:
            self.ui.lcdNumber.display("%d:%02d" % (self.start_time / 60, self.start_time % 60))
        else:
            self.timer.stop()

    @QtCore.pyqtSlot(int)
    def start_linczik(self, b):
        self.start_time = b
        self.ui.lcdNumber.display("%d:%02d" % (self.start_time / 60, self.start_time % 60))
        self.timer.start(1000)
        self.timer.timeout.connect(self.updateLCD)

class Polaczenie(QtCore.QThread):
    sig = QtCore.pyqtSignal(str,str)
    def __init__(self, parent):
        super(Polaczenie, self).__init__(parent)
        self.sig.connect(self.event_dispatcher)

    def run(self):
        server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        ip = "127.0.0.1"
        port = 1234
        adress = (ip, port)
        server.bind(adress)
        server.listen(1)

        while True:
            print("Start listenint on ", ip, " on ", port)
            (client, addr) = server.accept()
            print("Got connection from ", addr[0], ":", addr[1])
            data = client.recv(1024)
            data = data.decode()
            print("Recived ", data, " from the client")
            print("Processin data")
            indeks_srednik = data.index(";")
            instrukcja = data[:indeks_srednik]
            try:
                string = data[indeks_srednik+1:]
            except Exception as e:
                print(e)
            try:
                print(instrukcja)
                print(string)
                if instrukcja == "zamknij":
                    # Zamykanie aplikacji przy pomocy serwera
                    server.close()
                    sys.exit(0)
                elif instrukcja == "czas_set":
                    self.sig.emit("czas_set", string)
            except Exception as e:
                print(e)

    def event_dispatcher(self, a, b):
        # funkcja dispatchujaca eventy
        if a == "czas_set":
            print("licznik start")
            print(a)
            print(b)
            b=int(b)
            #MyForm().start_linczik(b)
            QtCore.QMetaObject.invokeMethod(self.parent(), "start_linczik", 
                QtCore.Qt.QueuedConnection,  QtCore.Q_ARG(int, b))


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    myapp = MyForm()
    myapp.show()
    sys.exit(app.exec_())

Useful Links

• Articles: https://python-commandments.org/
• PyQt: https://pythonpyqt.com/
• Tutorial: https://pythonprogramminglanguage.com/