pyqt example broadcastreceiver (snippet)

Python pyqt (gui) example 'broadcastreceiver'

broadcastreceiver

Python pyqt example: broadcastreceiver

#!/usr/bin/env python


#############################################################################
##
## Copyright (C) 2013 Riverbank Computing Limited.
## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
## All rights reserved.
##
## This file is part of the examples of PyQt.
##
## $QT_BEGIN_LICENSE:BSD$
## You may use this file under the terms of the BSD license as follows:
##
## "Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are
## met:
##   * Redistributions of source code must retain the above copyright
##     notice, this list of conditions and the following disclaimer.
##   * Redistributions in binary form must reproduce the above copyright
##     notice, this list of conditions and the following disclaimer in
##     the documentation and/or other materials provided with the
##     distribution.
##   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
##     the names of its contributors may be used to endorse or promote
##     products derived from this software without specific prior written
##     permission.
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
## $QT_END_LICENSE$
##
#############################################################################


from PyQt5.QtWidgets import (QApplication, QDialog, QHBoxLayout, QLabel,
        QPushButton, QVBoxLayout)
from PyQt5.QtNetwork import QUdpSocket


class Receiver(QDialog):
    def __init__(self, parent=None):
        super(Receiver, self).__init__(parent)

        self.statusLabel = QLabel("Listening for broadcasted messages")
        quitButton = QPushButton("&Quit")

        self.udpSocket = QUdpSocket(self)
        self.udpSocket.bind(45454)

        self.udpSocket.readyRead.connect(self.processPendingDatagrams)
        quitButton.clicked.connect(self.close)

        buttonLayout = QHBoxLayout()
        buttonLayout.addStretch(1)
        buttonLayout.addWidget(quitButton)
        buttonLayout.addStretch(1)

        mainLayout = QVBoxLayout()
        mainLayout.addWidget(self.statusLabel)
        mainLayout.addLayout(buttonLayout)
        self.setLayout(mainLayout)

        self.setWindowTitle("Broadcast Receiver")

    def processPendingDatagrams(self):
        while self.udpSocket.hasPendingDatagrams():
            datagram, host, port = self.udpSocket.readDatagram(self.udpSocket.pendingDatagramSize())

            try:
                # Python v3.
                datagram = str(datagram, encoding='ascii')
            except TypeError:
                # Python v2.
                pass

            self.statusLabel.setText("Received datagram: \"%s\"" % datagram)


if __name__ == '__main__':

    import sys

    app = QApplication(sys.argv)
    receiver = Receiver()
    receiver.show()
    sys.exit(receiver.exec_())

Useful links

• Learn PyQt: https://pythonbasics.org/pyqt-hello-world/
• Install PyQt: https://pythonbasics.org/install-pyqt/