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225 lines
8.1 KiB
Python
225 lines
8.1 KiB
Python
#!/usr/bin/env python
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#############################################################################
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##
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## Copyright (C) 2013 Riverbank Computing Limited.
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## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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## All rights reserved.
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##
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## This file is part of the examples of PyQt.
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##
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## $QT_BEGIN_LICENSE:BSD$
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## You may use this file under the terms of the BSD license as follows:
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##
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## "Redistribution and use in source and binary forms, with or without
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## modification, are permitted provided that the following conditions are
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## met:
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## * Redistributions of source code must retain the above copyright
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## notice, this list of conditions and the following disclaimer.
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## * Redistributions in binary form must reproduce the above copyright
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## notice, this list of conditions and the following disclaimer in
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## the documentation and/or other materials provided with the
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## distribution.
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## * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
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## the names of its contributors may be used to endorse or promote
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## products derived from this software without specific prior written
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## permission.
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##
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## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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## $QT_END_LICENSE$
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##
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#############################################################################
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from PyQt5.QtCore import (pyqtSignal, QDataStream, QMutex, QMutexLocker,
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QThread, QWaitCondition)
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from PyQt5.QtGui import QIntValidator
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from PyQt5.QtWidgets import (QApplication, QDialogButtonBox, QGridLayout,
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QLabel, QLineEdit, QMessageBox, QPushButton, QWidget)
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from PyQt5.QtNetwork import (QAbstractSocket, QHostAddress, QNetworkInterface,
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QTcpSocket)
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class FortuneThread(QThread):
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newFortune = pyqtSignal(str)
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error = pyqtSignal(int, str)
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def __init__(self, parent=None):
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super(FortuneThread, self).__init__(parent)
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self.quit = False
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self.hostName = ''
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self.cond = QWaitCondition()
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self.mutex = QMutex()
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self.port = 0
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def __del__(self):
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self.mutex.lock()
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self.quit = True
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self.cond.wakeOne()
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self.mutex.unlock()
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self.wait()
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def requestNewFortune(self, hostname, port):
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locker = QMutexLocker(self.mutex)
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self.hostName = hostname
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self.port = port
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if not self.isRunning():
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self.start()
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else:
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self.cond.wakeOne()
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def run(self):
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self.mutex.lock()
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serverName = self.hostName
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serverPort = self.port
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self.mutex.unlock()
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while not self.quit:
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Timeout = 5 * 1000
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socket = QTcpSocket()
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socket.connectToHost(serverName, serverPort)
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if not socket.waitForConnected(Timeout):
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self.error.emit(socket.error(), socket.errorString())
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return
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while socket.bytesAvailable() < 2:
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if not socket.waitForReadyRead(Timeout):
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self.error.emit(socket.error(), socket.errorString())
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return
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instr = QDataStream(socket)
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instr.setVersion(QDataStream.Qt_4_0)
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blockSize = instr.readUInt16()
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while socket.bytesAvailable() < blockSize:
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if not socket.waitForReadyRead(Timeout):
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self.error.emit(socket.error(), socket.errorString())
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return
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self.mutex.lock()
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fortune = instr.readQString()
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self.newFortune.emit(fortune)
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self.cond.wait(self.mutex)
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serverName = self.hostName
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serverPort = self.port
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self.mutex.unlock()
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class BlockingClient(QWidget):
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def __init__(self, parent=None):
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super(BlockingClient, self).__init__(parent)
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self.thread = FortuneThread()
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self.currentFortune = ''
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hostLabel = QLabel("&Server name:")
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portLabel = QLabel("S&erver port:")
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for ipAddress in QNetworkInterface.allAddresses():
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if ipAddress != QHostAddress.LocalHost and ipAddress.toIPv4Address() != 0:
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break
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else:
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ipAddress = QHostAddress(QHostAddress.LocalHost)
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ipAddress = ipAddress.toString()
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self.hostLineEdit = QLineEdit(ipAddress)
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self.portLineEdit = QLineEdit()
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self.portLineEdit.setValidator(QIntValidator(1, 65535, self))
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hostLabel.setBuddy(self.hostLineEdit)
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portLabel.setBuddy(self.portLineEdit)
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self.statusLabel = QLabel(
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"This example requires that you run the Fortune Server example as well.")
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self.statusLabel.setWordWrap(True)
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self.getFortuneButton = QPushButton("Get Fortune")
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self.getFortuneButton.setDefault(True)
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self.getFortuneButton.setEnabled(False)
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quitButton = QPushButton("Quit")
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buttonBox = QDialogButtonBox()
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buttonBox.addButton(self.getFortuneButton, QDialogButtonBox.ActionRole)
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buttonBox.addButton(quitButton, QDialogButtonBox.RejectRole)
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self.getFortuneButton.clicked.connect(self.requestNewFortune)
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quitButton.clicked.connect(self.close)
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self.hostLineEdit.textChanged.connect(self.enableGetFortuneButton)
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self.portLineEdit.textChanged.connect(self.enableGetFortuneButton)
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self.thread.newFortune.connect(self.showFortune)
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self.thread.error.connect(self.displayError)
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mainLayout = QGridLayout()
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mainLayout.addWidget(hostLabel, 0, 0)
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mainLayout.addWidget(self.hostLineEdit, 0, 1)
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mainLayout.addWidget(portLabel, 1, 0)
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mainLayout.addWidget(self.portLineEdit, 1, 1)
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mainLayout.addWidget(self.statusLabel, 2, 0, 1, 2)
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mainLayout.addWidget(buttonBox, 3, 0, 1, 2)
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self.setLayout(mainLayout)
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self.setWindowTitle("Blocking Fortune Client")
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self.portLineEdit.setFocus()
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def requestNewFortune(self):
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self.getFortuneButton.setEnabled(False)
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self.thread.requestNewFortune(self.hostLineEdit.text(),
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int(self.portLineEdit.text()))
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def showFortune(self, nextFortune):
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if nextFortune == self.currentFortune:
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self.requestNewFortune()
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return
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self.currentFortune = nextFortune
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self.statusLabel.setText(self.currentFortune)
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self.getFortuneButton.setEnabled(True)
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def displayError(self, socketError, message):
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if socketError == QAbstractSocket.HostNotFoundError:
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QMessageBox.information(self, "Blocking Fortune Client",
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"The host was not found. Please check the host and port "
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"settings.")
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elif socketError == QAbstractSocket.ConnectionRefusedError:
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QMessageBox.information(self, "Blocking Fortune Client",
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"The connection was refused by the peer. Make sure the "
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"fortune server is running, and check that the host name "
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"and port settings are correct.")
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else:
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QMessageBox.information(self, "Blocking Fortune Client",
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"The following error occurred: %s." % message)
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self.getFortuneButton.setEnabled(True)
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def enableGetFortuneButton(self):
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self.getFortuneButton.setEnabled(self.hostLineEdit.text() != '' and
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self.portLineEdit.text() != '')
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if __name__ == '__main__':
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import sys
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app = QApplication(sys.argv)
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client = BlockingClient()
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client.show()
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sys.exit(app.exec_())
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