How to send answer back to client with QTcpServer?

Igor86

Hi all!

I am using QTcpServer to set up a tcp server.. so far so good, I can connect, send messages to the server and the server prints them just fine. Now I am trying to send an answer back to the server but it crashes. I am not able to figure out what I am doing wrong...

def on_readyRead(self):
    msg = self.socket.readAll()
    print(type(msg), msg.count())
    print("Client Message:", msg)  #<--------- this line is executed properly....
    self.reply()

def reply(self):
    cmd = "this is an answer.. :) "
    ucmd = unicode(cmd, "utf-8")
    self.socket.write(ucmd)
    self.socket.flush()

any help appreciated.. thank you!

JonB

@Igor86
What exactly do you mean by "crashes", what output do you see, and where from your code does it "crash"?

Igor86

@JonB it crashes with the windows messagebox that the application is not responding..

if i run it in debug mode I get this before it stops:

Client Message: b'123456,aaa'
Traceback (most recent call last):
File "C:/yolov5/CrateVision/main.py", line 185, in on_readyRead
self.reply()
File "C:/yolov5/CrateVision/main.py", line 197, in reply
ucmd = unicode(cmd, "utf-8")
TypeError: decoding str is not supported

Process finished with exit code 1

JonB

@Igor86 said in How to send answer back to client with QTcpServer?:

ucmd = unicode(cmd, "utf-8")
TypeError: decoding str is not supported

So the error message already tells you what the issue is. This is a Python issue, nothing to do with Qt.