mirror of
https://github.com/pyqt/examples.git
synced 2025-08-23 01:57:10 +00:00
54f8b69baa
The commits since then moved many files into the src/ subdirectory. This would have broken existing links on the internet. To solve this, we leave the master branch as-is and make such breaking changes on a different branch.
225 lines
8.1 KiB
Python
225 lines
8.1 KiB
Python
#!/usr/bin/env python
|
|
|
|
|
|
#############################################################################
|
|
##
|
|
## Copyright (C) 2013 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
|
|
## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
|
|
## $QT_END_LICENSE$
|
|
##
|
|
#############################################################################
|
|
|
|
|
|
from PyQt5.QtCore import (pyqtSignal, QDataStream, QMutex, QMutexLocker,
|
|
QThread, QWaitCondition)
|
|
from PyQt5.QtGui import QIntValidator
|
|
from PyQt5.QtWidgets import (QApplication, QDialogButtonBox, QGridLayout,
|
|
QLabel, QLineEdit, QMessageBox, QPushButton, QWidget)
|
|
from PyQt5.QtNetwork import (QAbstractSocket, QHostAddress, QNetworkInterface,
|
|
QTcpSocket)
|
|
|
|
|
|
class FortuneThread(QThread):
|
|
newFortune = pyqtSignal(str)
|
|
|
|
error = pyqtSignal(int, str)
|
|
|
|
def __init__(self, parent=None):
|
|
super(FortuneThread, self).__init__(parent)
|
|
|
|
self.quit = False
|
|
self.hostName = ''
|
|
self.cond = QWaitCondition()
|
|
self.mutex = 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 = 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 = 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 = QDataStream(socket)
|
|
instr.setVersion(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.readQString()
|
|
self.newFortune.emit(fortune)
|
|
|
|
self.cond.wait(self.mutex)
|
|
serverName = self.hostName
|
|
serverPort = self.port
|
|
self.mutex.unlock()
|
|
|
|
|
|
class BlockingClient(QWidget):
|
|
def __init__(self, parent=None):
|
|
super(BlockingClient, self).__init__(parent)
|
|
|
|
self.thread = FortuneThread()
|
|
self.currentFortune = ''
|
|
|
|
hostLabel = QLabel("&Server name:")
|
|
portLabel = QLabel("S&erver port:")
|
|
|
|
for ipAddress in QNetworkInterface.allAddresses():
|
|
if ipAddress != QHostAddress.LocalHost and ipAddress.toIPv4Address() != 0:
|
|
break
|
|
else:
|
|
ipAddress = QHostAddress(QHostAddress.LocalHost)
|
|
|
|
ipAddress = ipAddress.toString()
|
|
|
|
self.hostLineEdit = QLineEdit(ipAddress)
|
|
self.portLineEdit = QLineEdit()
|
|
self.portLineEdit.setValidator(QIntValidator(1, 65535, self))
|
|
|
|
hostLabel.setBuddy(self.hostLineEdit)
|
|
portLabel.setBuddy(self.portLineEdit)
|
|
|
|
self.statusLabel = QLabel(
|
|
"This example requires that you run the Fortune Server example as well.")
|
|
self.statusLabel.setWordWrap(True)
|
|
|
|
self.getFortuneButton = QPushButton("Get Fortune")
|
|
self.getFortuneButton.setDefault(True)
|
|
self.getFortuneButton.setEnabled(False)
|
|
|
|
quitButton = QPushButton("Quit")
|
|
|
|
buttonBox = QDialogButtonBox()
|
|
buttonBox.addButton(self.getFortuneButton, QDialogButtonBox.ActionRole)
|
|
buttonBox.addButton(quitButton, QDialogButtonBox.RejectRole)
|
|
|
|
self.getFortuneButton.clicked.connect(self.requestNewFortune)
|
|
quitButton.clicked.connect(self.close)
|
|
self.hostLineEdit.textChanged.connect(self.enableGetFortuneButton)
|
|
self.portLineEdit.textChanged.connect(self.enableGetFortuneButton)
|
|
self.thread.newFortune.connect(self.showFortune)
|
|
self.thread.error.connect(self.displayError)
|
|
|
|
mainLayout = 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 == QAbstractSocket.HostNotFoundError:
|
|
QMessageBox.information(self, "Blocking Fortune Client",
|
|
"The host was not found. Please check the host and port "
|
|
"settings.")
|
|
elif socketError == QAbstractSocket.ConnectionRefusedError:
|
|
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:
|
|
QMessageBox.information(self, "Blocking Fortune Client",
|
|
"The following error occurred: %s." % message)
|
|
|
|
self.getFortuneButton.setEnabled(True)
|
|
|
|
def enableGetFortuneButton(self):
|
|
self.getFortuneButton.setEnabled(self.hostLineEdit.text() != '' and
|
|
self.portLineEdit.text() != '')
|
|
|
|
|
|
if __name__ == '__main__':
|
|
|
|
import sys
|
|
|
|
app = QApplication(sys.argv)
|
|
client = BlockingClient()
|
|
client.show()
|
|
sys.exit(app.exec_())
|