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#!/usr/bin/env python
############################################################################
#
# Copyright (C) 2004-2005 Trolltech AS. All rights reserved.
#
# This file is part of the example classes of the Qt Toolkit.
#
# This file may be used under the terms of the GNU General Public
# License version 2.0 as published by the Free Software Foundation
# and appearing in the file LICENSE.GPL included in the packaging of
# self file. Please review the following information to ensure GNU
# General Public Licensing requirements will be met:
# http://www.trolltech.com/products/qt/opensource.html
#
# If you are unsure which license is appropriate for your use, please
# review the following information:
# http://www.trolltech.com/products/qt/licensing.html or contact the
# sales department at sales@trolltech.com.
#
# This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
# WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
#
############################################################################
from PyQt4 import QtCore, QtGui, QtNetwork
class FortuneThread(QtCore.QThread):
newFortune = QtCore.pyqtSignal(str)
error = QtCore.pyqtSignal(int, str)
def __init__(self, parent=None):
super(FortuneThread, self).__init__(parent)
self.quit = False
self.hostName = ''
self.cond = QtCore.QWaitCondition()
self.mutex = QtCore.QMutex()
self.port = 0
def __del__(self):
self.mutex.lock()
self.quit = True
self.cond.wakeOne()
self.mutex.unlock()
self.wait()
def requestNewFortune(self, hostname, port):
locker = QtCore.QMutexLocker(self.mutex)
self.hostName = hostname
self.port = port
if not self.isRunning():
self.start()
else:
self.cond.wakeOne()
def run(self):
self.mutex.lock()
serverName = self.hostName
serverPort = self.port
self.mutex.unlock()
while not self.quit:
Timeout = 5 * 1000
socket = QtNetwork.QTcpSocket()
socket.connectToHost(serverName, serverPort)
if not socket.waitForConnected(Timeout):
self.error.emit(socket.error(), socket.errorString())
return
while socket.bytesAvailable() < 2:
if not socket.waitForReadyRead(Timeout):
self.error.emit(socket.error(), socket.errorString())
return
instr = QtCore.QDataStream(socket)
instr.setVersion(QtCore.QDataStream.Qt_4_0)
blockSize = instr.readUInt16()
while socket.bytesAvailable() < blockSize:
if not socket.waitForReadyRead(Timeout):
self.error.emit(socket.error(), socket.errorString())
return
self.mutex.lock()
fortune = instr.readString()
try:
# Python v3.
fortune = str(fortune, encoding='ascii')
except TypeError:
# Python v2.
pass
self.newFortune.emit(fortune)
self.cond.wait(self.mutex)
serverName = self.hostName
serverPort = self.port
self.mutex.unlock()
class BlockingClient(QtGui.QDialog):
def __init__(self, parent=None):
super(BlockingClient, self).__init__(parent)
self.thread = FortuneThread()
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 example 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.hostLineEdit.textChanged.connect(self.enableGetFortuneButton)
self.portLineEdit.textChanged.connect(self.enableGetFortuneButton)
self.getFortuneButton.clicked.connect(self.requestNewFortune)
quitButton.clicked.connect(self.close)
self.thread.newFortune.connect(self.showFortune)
self.thread.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("Blocking Fortune Client")
self.portLineEdit.setFocus()
def requestNewFortune(self):
self.getFortuneButton.setEnabled(False)
self.thread.requestNewFortune(self.hostLineEdit.text(),
int(self.portLineEdit.text()))
def showFortune(self, nextFortune):
if nextFortune == self.currentFortune:
self.requestNewFortune()
return
self.currentFortune = nextFortune
self.statusLabel.setText(self.currentFortune)
self.getFortuneButton.setEnabled(True)
def displayError(self, socketError, message):
if socketError == QtNetwork.QAbstractSocket.HostNotFoundError:
QtGui.QMessageBox.information(self, "Blocking Fortune Client",
"The host was not found. Please check the host and port "
"settings.")
elif socketError == QtNetwork.QAbstractSocket.ConnectionRefusedError:
QtGui.QMessageBox.information(self, "Blocking 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, "Blocking Fortune Client",
"The following error occurred: %s." % message)
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 = BlockingClient()
client.show()
sys.exit(client.exec_())
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