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Re: [sumo-user] struct.error: unpack requires a buffer of 4 bytes
  • From: Michael Behrisch <oss@xxxxxxxxxxx>
  • Date: Thu, 24 Jan 2019 22:00:28 +0100
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Hi,
could you try, whether the error occurs more often when you add another
client? Also can you check whether replacing _socket.send by
_socket.sendall in traci.connection._sendExact helps?

Best regards,
Michael

Am 15.01.19 um 09:07 schrieb ratzenmeier@xxxxxx:
> Hi all,
>  
> since I'm using threading and multiclients in SUMO with TraCI, I get
> "sometimes" the following problem:
>  
> Exception in thread TraciThread:
> Traceback (most recent call last):
>   File "C:\Program Files (x86)\Microsoft Visual
> Studio\Shared\Python36_64\lib\threading.py", line 916, in _bootstrap_inner
>     self.run()
>   File "C:\Program Files (x86)\Microsoft Visual
> Studio\Shared\Python36_64\lib\threading.py", line 864, in run
>     self._target(*self._args, **self._kwargs)
>   File "D:\Repos\xy\abc\communication_traci_to_server.py", line 21, in
> runCommunication
>     self.connection2.simulationStep()
>   File
> "C:\Users\blub\PycharmProjects\abc\lib\site-packages\traci\connection.py",
> line 323, in simulationStep
>     result = self._sendExact()
>   File
> "C:\Users\blub\PycharmProjects\abc\lib\site-packages\traci\connection.py",
> line 102, in _sendExact
>     err = result.readString()
>   File
> "C:\Users\blub\PycharmProjects\abc\lib\site-packages\traci\storage.py",
> line 62, in readString
>     length = self.read("!i")[0]
>   File
> "C:\Users\blub\PycharmProjects\abc\lib\site-packages\traci\storage.py",
> line 37, in read
>     return struct.unpack(format, self._content[oldPos:self._pos])
> struct.error: unpack requires a buffer of 4 bytes
>  
> So, there are three threads: starting the main connection of sumo(client
> 1), starting client 2 an starting a http server.
> I'm also working with a queue to communicate between the client and the
> http server.
>  
> I'm only seeing, that something in the .simulationStep() of client 2 is
> wrong.
>  
> Any help or suggestions?
>  
> Thanks and greetings!
> 
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