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I have define my protobuf message that is serialize in CPP and send to Python program thank to a wrapper. On CPP side, the protobuf message is generate as std::string

Here is how I generate in cpp my message:

  ....
  std::string data = results.SerializeAsString();
  return data;

In Python, I just connect my CPP wrapper and I try to get the string message. With a common message, the communication between CPP and Python works properly but with the protobuf serialized message, I get that error:

'utf-8' codec can't decode byte 0xff in position 13: invalid start byte

Is there a way to encore in CPP the string message to be readable in Python?

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    Protobuf uses UTF-8 encoding to pass strings. So if your string contains 0xff and it is not BOM in front of it it is invalid UTF-8 encoding. So sender side had to use string which is not UTF-8 encoded. You should show code which writes some string value into class generated protobuf. Commented Jan 23, 2024 at 15:34
  • Just to clarify std::string data = results.SerializeAsString(); is not related to your problem. Commented Jan 23, 2024 at 15:42
  • You need to show the python code. More specifically, why are you trying to decode binary data as utf8? Commented Jan 24, 2024 at 9:21
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