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#!/usr/bin/env python
#############################################################################
##
## Copyright (C) 2013 Riverbank Computing Limited
## Copyright (C) 2010 Hans-Peter Jansen <hpj@urpla.net>.
## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
## All rights reserved.
##
## This file is part of the examples of PyQt.
##
## $QT_BEGIN_LICENSE:LGPL$
## Commercial Usage
## Licensees holding valid Qt Commercial licenses may use this file in
## accordance with the Qt Commercial License Agreement provided with the
## Software or, alternatively, in accordance with the terms contained in
## a written agreement between you and Nokia.
##
## GNU Lesser General Public License Usage
## Alternatively, this file may be used under the terms of the GNU Lesser
## General Public License version 2.1 as published by the Free Software
## Foundation and appearing in the file LICENSE.LGPL included in the
## packaging of this file. Please review the following information to
## ensure the GNU Lesser General Public License version 2.1 requirements
## will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
##
## In addition, as a special exception, Nokia gives you certain additional
## rights. These rights are described in the Nokia Qt LGPL Exception
## version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
##
## GNU General Public License Usage
## Alternatively, this file may be used under the terms of the GNU
## General Public License version 3.0 as published by the Free Software
## Foundation and appearing in the file LICENSE.GPL included in the
## packaging of this file. Please review the following information to
## ensure the GNU General Public License version 3.0 requirements will be
## met: http://www.gnu.org/copyleft/gpl.html.
##
## If you have questions regarding the use of this file, please contact
## Nokia at qt-info@nokia.com.
## $QT_END_LICENSE$
##
#############################################################################
from PyQt5.QtCore import QDataStream, QTimer
from PyQt5.QtWidgets import (QApplication, QDialog, QDialogButtonBox,
QGridLayout, QLabel, QLineEdit, QMessageBox, QPushButton)
from PyQt5.QtNetwork import QLocalSocket
class Client(QDialog):
def __init__(self, parent=None):
super(Client, self).__init__(parent)
self.blockSize = 0
self.currentFortune = None
hostLabel = QLabel("&Server name:")
self.hostLineEdit = QLineEdit("fortune")
hostLabel.setBuddy(self.hostLineEdit)
self.statusLabel = QLabel(
"This examples requires that you run the Fortune Server "
"example as well.")
self.statusLabel.setWordWrap(True)
self.getFortuneButton = QPushButton("Get Fortune")
self.getFortuneButton.setDefault(True)
quitButton = QPushButton("Quit")
buttonBox = QDialogButtonBox()
buttonBox.addButton(self.getFortuneButton, QDialogButtonBox.ActionRole)
buttonBox.addButton(quitButton, QDialogButtonBox.RejectRole)
self.socket = QLocalSocket()
self.hostLineEdit.textChanged.connect(self.enableGetFortuneButton)
self.getFortuneButton.clicked.connect(self.requestNewFortune)
quitButton.clicked.connect(self.close)
self.socket.readyRead.connect(self.readFortune)
self.socket.error.connect(self.displayError)
mainLayout = QGridLayout()
mainLayout.addWidget(hostLabel, 0, 0)
mainLayout.addWidget(self.hostLineEdit, 0, 1)
mainLayout.addWidget(self.statusLabel, 2, 0, 1, 2)
mainLayout.addWidget(buttonBox, 3, 0, 1, 2)
self.setLayout(mainLayout)
self.setWindowTitle("Fortune Client")
self.hostLineEdit.setFocus()
def requestNewFortune(self):
self.getFortuneButton.setEnabled(False)
self.blockSize = 0
self.socket.abort()
self.socket.connectToServer(self.hostLineEdit.text())
def readFortune(self):
ins = QDataStream(self.socket)
ins.setVersion(QDataStream.Qt_4_0)
if self.blockSize == 0:
if self.socket.bytesAvailable() < 2:
return
self.blockSize = ins.readUInt16()
if ins.atEnd():
return
nextFortune = ins.readQString()
if nextFortune == self.currentFortune:
QTimer.singleShot(0, self.requestNewFortune)
return
self.currentFortune = nextFortune
self.statusLabel.setText(self.currentFortune)
self.getFortuneButton.setEnabled(True)
def displayError(self, socketError):
errors = {
QLocalSocket.ServerNotFoundError:
"The host was not found. Please check the host name and port "
"settings.",
QLocalSocket.ConnectionRefusedError:
"The connection was refused by the peer. Make sure the "
"fortune server is running, and check that the host name and "
"port settings are correct.",
QLocalSocket.PeerClosedError:
None,
}
msg = errors.get(socketError,
"The following error occurred: %s." % self.socket.errorString())
if msg is not None:
QMessageBox.information(self, "Fortune Client", msg)
self.getFortuneButton.setEnabled(True)
def enableGetFortuneButton(self):
self.getFortuneButton.setEnabled(self.hostLineEdit.text() != "")
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
client = Client()
client.show()
sys.exit(app.exec_())
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