how to receive binary package?

[evehaxor]

Hello, How do I interpret binary packages using the socket.io module?

python-engineio 3.14.2
python-socketio 4.6.0

[miguelgrinberg]

Binary messages are passed on to handlers in the same way as regular JSON messages. Are you familiar with the Socket.IO protocol?

[evehaxor]

Binary messages are passed on to handlers in the same way as regular JSON messages. Are you familiar with the Socket.IO protocol?

I'm learning, can you give me an example?

[miguelgrinberg]

@evehaxor there is no difference between binary and non-binary data. Just use a bytes object for your binary packets. You can send just a binary payload, or you can combine JSON with binary, both work.

[evehaxor]

I don't know how to interpret binary messages in python

@sio.on('s_balance/list')
def message(data):
    print(data)

it works

but how do I do binary messages? thanks for listening

[miguelgrinberg]

There are no changes to your code for binary data. The data argument would be of type bytes if the other side sends a binary payload.

[fcy197778770]

Binary messages are passed on to handlers in the same way as regular JSON messages. Are you familiar with the Socket.IO protocol?

Emitting event "message" [/stock]
Sending packet MESSAGE data 51-/stock,["message",{"_placeholder":true,"num":0}]
Sending packet MESSAGE data

hi，what does {"_placeholder":true,"num":0} mean？？
I don't understand，

sio.emit(event='trdCmd', data=b'\x08\x05\x10h*\x1b\x12\x0860000011\x1a\x06123456J\x071.7.7.7', namespace="/stock")

this is mye code and i can't Received anything

[miguelgrinberg]

@fcy197778770 the placeholder is where the binary data goes. This data is sent in a follow up package. Read the socket.io protocol documentation if you are interested in the internals.

[fcy197778770]

@fcy197778770 the placeholder is where the binary data goes. This data is sent in a follow up package. Read the socket.io protocol documentation if you are interested in the internals.

@miguelgrinberg Hi, I checked the log，I did send sessages and the server received a message.
but It looks like a mess。

the ERROR line is the message i send.
It should be b'\x08\xba\xd0\xe7\x04\x10h*\x1c\x12\t880331110\x1a\x06123456J\x071.7.7.7:!27e9c10d246e63971a6680f2eba6a8fb5'

[miguelgrinberg]

@fcy197778770 This is not a log that comes from this package, so I don't know how to interpret it. Please create a small server and client application that I can use to reproduce the problem here.