Sending image data between C++ and Python websockets

[KoFilip]

Hi Group

I want to send image data between C++ and Python websockets. I use in both cases QtWebSockets and protobuf. My message looks like that: 

message Image {

  bytes data = 1;

  int32 width = 2;

  int32 height = 3;

  int32 channels = 4;

}

In the C++ side I use the following code to create the stream:

byteArray.resize(proto_image.ByteSize()); ret = proto_image.SerializeToArray(byteArray.data(), byteArray.size());

and use the sendBinaryMessage of the websockets to send the message.

In the Python side I use the following out of QtPy5: 

def processBinaryMessage(self, message):
  image = projectname_pb2.Image()
  image.ParseFromString(message)

which works fine. If I print image.width I get the correct width. However I am not sure how to further process the image data image.data, for example to put it into a np.array or show it with matplotlib. Any Hints? 

Thank you for your help

Best