#!/usr/bin/env python
#############################################################################
##
## Copyright (C) 2010 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
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## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
## $QT_END_LICENSE$
##
#############################################################################
from PyQt4 import QtCore, QtGui, QtNetwork
class Client(QtGui.QDialog):
def __init__(self, parent=None):
super(Client, self).__init__(parent)
self.blockSize = 0
self.currentFortune = ''
hostLabel = QtGui.QLabel("&Server name:")
portLabel = QtGui.QLabel("S&erver port:")
self.hostLineEdit = QtGui.QLineEdit('Localhost')
self.portLineEdit = QtGui.QLineEdit()
self.portLineEdit.setValidator(QtGui.QIntValidator(1, 65535, self))
hostLabel.setBuddy(self.hostLineEdit)
portLabel.setBuddy(self.portLineEdit)
self.statusLabel = QtGui.QLabel("This examples requires that you run "
"the Fortune Server example as well.")
self.getFortuneButton = QtGui.QPushButton("Get Fortune")
self.getFortuneButton.setDefault(True)
self.getFortuneButton.setEnabled(False)
quitButton = QtGui.QPushButton("Quit")
buttonBox = QtGui.QDialogButtonBox()
buttonBox.addButton(self.getFortuneButton,
QtGui.QDialogButtonBox.ActionRole)
buttonBox.addButton(quitButton, QtGui.QDialogButtonBox.RejectRole)
self.tcpSocket = QtNetwork.QTcpSocket(self)
self.hostLineEdit.textChanged.connect(self.enableGetFortuneButton)
self.portLineEdit.textChanged.connect(self.enableGetFortuneButton)
self.getFortuneButton.clicked.connect(self.requestNewFortune)
quitButton.clicked.connect(self.close)
self.tcpSocket.readyRead.connect(self.readFortune)
self.tcpSocket.error.connect(self.displayError)
mainLayout = QtGui.QGridLayout()
mainLayout.addWidget(hostLabel, 0, 0)
mainLayout.addWidget(self.hostLineEdit, 0, 1)
mainLayout.addWidget(portLabel, 1, 0)
mainLayout.addWidget(self.portLineEdit, 1, 1)
mainLayout.addWidget(self.statusLabel, 2, 0, 1, 2)
mainLayout.addWidget(buttonBox, 3, 0, 1, 2)
self.setLayout(mainLayout)
self.setWindowTitle("Fortune Client")
self.portLineEdit.setFocus()
def requestNewFortune(self):
self.getFortuneButton.setEnabled(False)
self.blockSize = 0
self.tcpSocket.abort()
self.tcpSocket.connectToHost(self.hostLineEdit.text(),
int(self.portLineEdit.text()))
def readFortune(self):
instr = QtCore.QDataStream(self.tcpSocket)
instr.setVersion(QtCore.QDataStream.Qt_4_0)
if self.blockSize == 0:
if self.tcpSocket.bytesAvailable() < 2:
return
self.blockSize = instr.readUInt16()
if self.tcpSocket.bytesAvailable() < self.blockSize:
return
nextFortune = instr.readString()
try:
# Python v3.
nextFortune = str(nextFortune, encoding='ascii')
except TypeError:
# Python v2.
pass
if nextFortune == self.currentFortune:
QtCore.QTimer.singleShot(0, self.requestNewFortune)
return
self.currentFortune = nextFortune
self.statusLabel.setText(self.currentFortune)
self.getFortuneButton.setEnabled(True)
def displayError(self, socketError):
if socketError == QtNetwork.QAbstractSocket.RemoteHostClosedError:
pass
elif socketError == QtNetwork.QAbstractSocket.HostNotFoundError:
QtGui.QMessageBox.information(self, "Fortune Client",
"The host was not found. Please check the host name and "
"port settings.")
elif socketError == QtNetwork.QAbstractSocket.ConnectionRefusedError:
QtGui.QMessageBox.information(self, "Fortune Client",
"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.")
else:
QtGui.QMessageBox.information(self, "Fortune Client",
"The following error occurred: %s." % self.tcpSocket.errorString())
self.getFortuneButton.setEnabled(True)
def enableGetFortuneButton(self):
self.getFortuneButton.setEnabled(bool(self.hostLineEdit.text() and
self.portLineEdit.text()))
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
client = Client()
client.show()
sys.exit(client.exec_())
