W przypadku, jeśli ktoś chce uruchomić @ekhumoro rozwiązanie python3 tam trzeba zrobić kilka korekt do operacji łańcuchowych, będę dzielić się moją kopię gdzie pracował Pythona 3.
import sys
from PyQt4 import QtGui, QtCore, QtNetwork
class SingleApplication(QtGui.QApplication):
def __init__(self, argv, key):
QtGui.QApplication.__init__(self, argv)
self._memory = QtCore.QSharedMemory(self)
self._memory.setKey(key)
if self._memory.attach():
self._running = True
else:
self._running = False
if not self._memory.create(1):
raise RuntimeError(self._memory.errorString())
def isRunning(self):
return self._running
class SingleApplicationWithMessaging(SingleApplication):
def __init__(self, argv, key):
SingleApplication.__init__(self, argv, key)
self._key = key
self._timeout = 1000
self._server = QtNetwork.QLocalServer(self)
if not self.isRunning():
self._server.newConnection.connect(self.handleMessage)
self._server.listen(self._key)
def handleMessage(self):
socket = self._server.nextPendingConnection()
if socket.waitForReadyRead(self._timeout):
self.emit(QtCore.SIGNAL('messageAvailable'), bytes(socket.readAll().data()).decode('utf-8'))
socket.disconnectFromServer()
else:
QtCore.qDebug(socket.errorString())
def sendMessage(self, message):
if self.isRunning():
socket = QtNetwork.QLocalSocket(self)
socket.connectToServer(self._key, QtCore.QIODevice.WriteOnly)
if not socket.waitForConnected(self._timeout):
print(socket.errorString())
return False
socket.write(str(message).encode('utf-8'))
if not socket.waitForBytesWritten(self._timeout):
print(socket.errorString())
return False
socket.disconnectFromServer()
return True
return False
class Window(QtGui.QWidget):
def __init__(self):
QtGui.QWidget.__init__(self)
self.edit = QtGui.QLineEdit(self)
self.edit.setMinimumWidth(300)
layout = QtGui.QVBoxLayout(self)
layout.addWidget(self.edit)
def handleMessage(self, message):
self.edit.setText(message)
if __name__ == '__main__':
key = 'foobar'
# if parameter no. 1 was set then we'll use messaging between app instances
if len(sys.argv) > 1:
app = SingleApplicationWithMessaging(sys.argv, key)
if app.isRunning():
msg = ''
# checking if custom message was passed as cli argument
if len(sys.argv) > 2:
msg = sys.argv[2]
else:
msg = 'APP ALREADY RUNNING'
app.sendMessage(msg)
print("app is already running, sent following message: \n\"{0}\"".format(msg))
sys.exit(1)
else:
app = SingleApplication(sys.argv, key)
if app.isRunning():
print('app is already running, no message has been sent')
sys.exit(1)
window = Window()
app.connect(app, QtCore.SIGNAL('messageAvailable'), window.handleMessage)
window.show()
sys.exit(app.exec_())
Przykład cli połączeń, przy założeniu, że nazwa skrypt jest "SingleInstanceApp.py":
python SingleInstanceApp.py 1
python SingleInstanceApp.py 1 "test"
python SingleInstanceApp.py 1 "foo bar baz"
python SingleInstanceApp.py 1 "utf8 test FOO ßÄÖÜ ßäöü łąćźżóń ŁĄĆŹŻÓŃ etc"
(i tu jest wywołanie wihout pierwszego parametru, więc po prostu wiadomość nie zostanie wysłana)
python SingleInstanceApp.py
Mam nadzieję, że to pomoże komuś.
Prawdopodobnie duplikat http://stackoverflow.com/questions/5006547/qt-best-practice-for-a-single-instance-app-protection –