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#!/usr/bin/env python
"""PyQt4 port of the network/fortuneclient example from Qt v4.x"""
import sys
from PyQt4 import QtCore, QtGui, QtNetwork
class Client(QtGui.QDialog):
def __init__(self, parent=None):
QtGui.QDialog.__init__(self, parent)
self.hostLabel = QtGui.QLabel(self.tr("&Server name:"))
self.portLabel = QtGui.QLabel(self.tr("S&erver port:"))
self.hostLineEdit = QtGui.QLineEdit("Localhost")
self.portLineEdit = QtGui.QLineEdit()
self.portLineEdit.setValidator(QtGui.QIntValidator(1, 65535, self))
self.hostLabel.setBuddy(self.hostLineEdit)
self.portLabel.setBuddy(self.portLineEdit)
self.statusLabel = QtGui.QLabel(self.tr("This examples requires that you run "
"the Fortune Server example as well."))
self.getFortuneButton = QtGui.QPushButton(self.tr("Get Fortune"))
self.getFortuneButton.setDefault(True)
self.getFortuneButton.setEnabled(False)
self.quitButton = QtGui.QPushButton(self.tr("Quit"))
self.timerId = -1
self.blockSize = 0
self.currentFortune = QtCore.QString()
self.tcpSocket = QtNetwork.QTcpSocket(self)
self.connect(self.hostLineEdit, QtCore.SIGNAL("textChanged(const QString &)"), self.enableGetFortuneButton)
self.connect(self.portLineEdit, QtCore.SIGNAL("textChanged(const QString &)"), self.enableGetFortuneButton)
self.connect(self.getFortuneButton, QtCore.SIGNAL("clicked()"), self.requestNewFortune)
self.connect(self.quitButton, QtCore.SIGNAL("clicked()"), self, QtCore.SLOT("close()"))
self.connect(self.tcpSocket, QtCore.SIGNAL("readyRead()"), self.readFortune)
self.connect(self.tcpSocket, QtCore.SIGNAL("error(QAbstractSocket::SocketError)"), self.displayError)
buttonLayout = QtGui.QHBoxLayout()
buttonLayout.addStretch(1)
buttonLayout.addWidget(self.getFortuneButton)
buttonLayout.addWidget(self.quitButton)
mainLayout = QtGui.QGridLayout()
mainLayout.addWidget(self.hostLabel, 0, 0)
mainLayout.addWidget(self.hostLineEdit, 0, 1)
mainLayout.addWidget(self.portLabel, 1, 0)
mainLayout.addWidget(self.portLineEdit, 1, 1)
mainLayout.addWidget(self.statusLabel, 2, 0, 1, 2)
mainLayout.addLayout(buttonLayout, 3, 0, 1, 2)
self.setLayout(mainLayout)
self.setWindowTitle(self.tr("Fortune Client"))
self.portLineEdit.setFocus()
def requestNewFortune(self):
self.getFortuneButton.setEnabled(False)
self.blockSize = 0
self.tcpSocket.abort()
self.tcpSocket.connectToHost(self.hostLineEdit.text(), self.portLineEdit.text().toInt()[0])
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 = QtCore.QString()
instr >> nextFortune
if nextFortune == self.currentFortune:
self.timerId = self.startTimer(10)
return
self.currentFortune = nextFortune
self.statusLabel.setText(self.currentFortune)
self.getFortuneButton.setEnabled(True)
def timerEvent(self, event):
if event.timerId() == self.timerId:
self.killTimer(self.timerId)
self.timerId = -1
self.requestNewFortune()
def displayError(self, socketError):
if socketError == QtNetwork.QAbstractSocket.RemoteHostClosedError:
pass
elif socketError == QtNetwork.QAbstractSocket.HostNotFoundError:
QtGui.QMessageBox.information(self, self.tr("Fortune Client"), self.tr(
"The host was not found. Please check the "
"host name and port settings."))
elif socketError == QtNetwork.QAbstractSocket.ConnectionRefusedError:
QtGui.QMessageBox.information(self, self.tr("Fortune Client"), self.tr(
"The connection was refused by the peer. "
"Make sure the fortune server is running,\n"
"and check that the host name and port "
"settings are correct."))
else:
QtGui.QMessageBox.information(self, self.tr("Fortune Client"),
self.tr("The following error occurred: %1.")
.arg(self.tcpSocket.errorString()))
self.getFortuneButton.setEnabled(True)
def enableGetFortuneButton(self):
self.getFortuneButton.setEnabled(not self.hostLineEdit.text().isEmpty() and
not self.portLineEdit.text().isEmpty())
if __name__ == '__main__':
app = QtGui.QApplication(sys.argv)
client = Client()
sys.exit(client.exec_())
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