Sender always is null(Invalid Signal signature: textMessageReceived(str))

tham

OS : win10 64bits
python : 3.7.3(anaconda)
install by pip : pip install PySide2(PySide2 5.12.2)
llvm: libclang-release_70-based-windows-mingw_64\libclang

I am trying to find out the sender(find out which QWebSocket send the message), but it always tell me the sender is None, try to follow the suggestion in this post, use different way to connect signal and slot, but it always give me error message "Invalid Signal signature: textMessageReceived(str)".

Minimum codes to reproduce:

import sys

from PySide2.QtCore import Slot, SIGNAL
from PySide2.QtNetwork import QHostAddress
from PySide2.QtWidgets import QApplication, QPushButton
from PySide2.QtWebSockets import QWebSocketServer, QWebSocket


class Worker(QPushButton):

    def __init__(self):
        super(Worker, self).__init__()

        self.clicked.connect(self.run)
        self.__server = QWebSocketServer("sss", QWebSocketServer.NonSecureMode)
        if self.__server.listen(QHostAddress.AnyIPv4, 1234):
            print("server listening")
            self.__server.newConnection.connect(self.__clientConnected)
        self.__socket = QWebSocket()
        print("socket open")
        self.__socket.open("ws://localhost:1234")

    def __connect(self):
        self.__socket.open("ws//127.0.0.1:1234")

    def __clientConnected(self):
        print("client connected sender:", self.sender())  # this sender is not null
        clientConnected = self.__server.nextPendingConnection()

        # connect by this solutoin, the sender always is null
        clientConnected.textMessageReceived.connect(self.__textMessageReceived)

        # connect by SIGNAL always tell me Invalid Signal signature: textMessageReceived(str)
        clientConnected.connect(clientConnected, SIGNAL("textMessageReceived(str)"), self.__textMessageReceived)

    @Slot()
    def run(self):
        print("run sender:", self.sender())  # this sender is not null
        self.__socket.sendTextMessage("send message")

    @Slot(str)
    def __textMessageReceived(self, msg):  # this sender always is null
        print("text message sender:", self.sender())


if __name__ == "__main__":
    app = QApplication(sys.argv)

    worker = Worker()
    worker.setText("click me")
    worker.resize(640, 480)
    worker.show()

    sys.exit(app.exec_())

I try to import QString, but cannot do it
Do anyone know how to solve it?Thanks

Kent-Dorfman

I think you are trying to be too slick, implementing network code under a pushbutton. Separate out the functionality into different objects and communicate between them when necessary.

tham

@Kent-Dorfman Thanks, this is just a minimum example to show the issues, do you know how could I solve the issue of "Sender is None"? Thanks

klyjm

Remove the @Slot(), I had the same question, and I remove the @Slot(), everything is ok.