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Thread: PyQt5 QSerialPort QSocketNotifier: Invalid socket specified

  1. #1
    Join Date
    Jul 2016
    Qt products
    Unix/X11 Windows

    Default PyQt5 QSerialPort QSocketNotifier: Invalid socket specified

    I had a code on PyQt4 and I was working with pyserial, like this:

    Qt Code:
    1. import serial
    2. global ser
    4. def setting_COMPort():
    5. global ser
    6. ser = serial.Serial(
    7. port='/dev/ttyAMA0',
    8. baudrate = 115200,
    9. parity=serial.PARITY_NONE,
    10. stopbits=serial.STOPBITS_ONE,
    11. bytesize=serial.EIGHTBITS,
    12. timeout=1)
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    and when I wanted to send something to serial port I did just:

    Qt Code:
    1. ser.write(":010600000044b5\r\n")
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    Easy, simple and worked stable and perfect. But I needed some function which were unavaliable in serial, so I changed to PyQt5 and QSerialPort. Now my code have this Gestalt:

    Qt Code:
    1. from PyQt5.QtSerialPort import QSerialPort
    2. from PyQt5 import QtCore
    4. def setting_COMPort(ser): # ser is an object of QSerialPort
    5. ser.setBaudRate(QSerialPort.Baud115200)
    6. ser.setParity(QSerialPort.NoParity)
    7. ser.setOpenMode(QSerialPort.ReadWrite)
    8. ser.setStopBits(QSerialPort.OneStop)
    9. ser.setDataBits(QSerialPort.Data8)
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    but sending data to serial seems not to be so easy on this way. So now with the power of PyQt5 I am doing it like this in function:

    Qt Code:
    1. # ser is the same object of QSerialPort
    2. s=":010600000044b5\r\n"
    3. data_to_send=QtCore.QByteAray(s)
    4. ser.write(data_to_send)
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    But I am getting the error QSocketNotifier: Invalid socket specified

    There are some tries to find a solution on the web, but nothing real.

    So what am I doing incorrect, why this way to send a string through QSerialPort does not work?
    Last edited by Blitzor DDD; 16th August 2017 at 12:23.

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