1#!/usr/bin/env python
2
3
4#############################################################################
5##
6## Copyright (C) 2013 Riverbank Computing Limited.
7## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
8## All rights reserved.
9##
10## This file is part of the examples of PyQt.
11##
12## $QT_BEGIN_LICENSE:BSD$
13## You may use this file under the terms of the BSD license as follows:
14##
15## "Redistribution and use in source and binary forms, with or without
16## modification, are permitted provided that the following conditions are
17## met:
18##   * Redistributions of source code must retain the above copyright
19##     notice, this list of conditions and the following disclaimer.
20##   * Redistributions in binary form must reproduce the above copyright
21##     notice, this list of conditions and the following disclaimer in
22##     the documentation and/or other materials provided with the
23##     distribution.
24##   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
25##     the names of its contributors may be used to endorse or promote
26##     products derived from this software without specific prior written
27##     permission.
28##
29## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
32## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
33## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
34## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
35## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
39## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
40## $QT_END_LICENSE$
41##
42#############################################################################
43
44
45from PyQt5.QtWidgets import (QApplication, QDialog, QHBoxLayout, QLabel,
46        QPushButton, QVBoxLayout)
47from PyQt5.QtNetwork import QUdpSocket
48
49
50class Receiver(QDialog):
51    def __init__(self, parent=None):
52        super(Receiver, self).__init__(parent)
53
54        self.statusLabel = QLabel("Listening for broadcasted messages")
55        quitButton = QPushButton("&Quit")
56
57        self.udpSocket = QUdpSocket(self)
58        self.udpSocket.bind(45454)
59
60        self.udpSocket.readyRead.connect(self.processPendingDatagrams)
61        quitButton.clicked.connect(self.close)
62
63        buttonLayout = QHBoxLayout()
64        buttonLayout.addStretch(1)
65        buttonLayout.addWidget(quitButton)
66        buttonLayout.addStretch(1)
67
68        mainLayout = QVBoxLayout()
69        mainLayout.addWidget(self.statusLabel)
70        mainLayout.addLayout(buttonLayout)
71        self.setLayout(mainLayout)
72
73        self.setWindowTitle("Broadcast Receiver")
74
75    def processPendingDatagrams(self):
76        while self.udpSocket.hasPendingDatagrams():
77            datagram, host, port = self.udpSocket.readDatagram(self.udpSocket.pendingDatagramSize())
78
79            try:
80                # Python v3.
81                datagram = str(datagram, encoding='ascii')
82            except TypeError:
83                # Python v2.
84                pass
85
86            self.statusLabel.setText("Received datagram: \"%s\"" % datagram)
87
88
89if __name__ == '__main__':
90
91    import sys
92
93    app = QApplication(sys.argv)
94    receiver = Receiver()
95    receiver.show()
96    sys.exit(receiver.exec_())
97