Bad file descriptor when using Pyside

Question

My code is:

class Receiver(QWidget): def __init__(self): self.s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) #Create button QToolTip.setFont(QFont('Time New Roman',10)) super(Example, self).__init__() ... self.btnConnect.clicked.connect(self.connectserver) self.btnConnect.clicked.connect(self.disconnect) self.btnLeft.clicked.connect(self.turnleft) self.btnRight.clicked.connect(self.turnright) def connectserver(self): self.s.connect((TCP_IP, TCP_PORT)) length = recvall(conn,16) stringData = recvall(s, int(length)) while True: data = numpy.fromstring(stringData, dtype='uint8') decimg=cv2.imdecode(data,1) cv2.imshow('Client',decimg) cv2.waitKey(10) def disconnect(self): self.s.close() def turnleft(self): self.s.send("left") def turnright(self): self.s.send("right") 

First, click the "Connect" button. It worked, but when I click "Turn left" or "Turn right", I received an error message:

 Traceback (most recent call last): File "D:\NEW\GUI.py", line 69, in turnright self.s.send("right") File "C:\Python27\lib\socket.py", line 170, in _dummy raise error(EBADF, 'Bad file descriptor') socket.error: [Errno 9] Bad file descriptor 

Answer 1

You have connected btnConnect to connectserver and disconnect , therefore, by clicking on it, it will connect and immediately disconnect the socket.

If you try to send data to a private socket, this will result in a bad file descriptor error.