Kotlin 客户端从 Linux python3 套接字服务器发送和接收图像

Question

I'm trying to send and receive Image with Socket connect However, the string between the client and the server can be exchanged, but it does not proceed from exchanging images.

This is My Kotlin Client code

class MainActivity : AppCompatActivity() {
lateinit var binding: ActivityMainBinding


override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    binding = ActivityMainBinding.inflate(layoutInflater)
    setContentView(binding.root)

    Client().start()

}



class Client : Thread()
{
    var readImage = ReadImage()
    override fun run(){
        try{
            var socket = Socket("35.216.104.58",3000)
            var input = socket.getInputStream()
            var dis = DataInputStream(input)

            var output = socket.getOutputStream()
            var dos = DataOutputStream(output)
            var data  = getImageByte(readImage.setImage(0))
            dos.write(data)

            dos.close()
            output.close()
            socket.close()



        }catch (e: Exception){
            e.printStackTrace()
        }


    }

  }
}

and this is My Python3 Code

import socket
import cv2

ip = ''
port = 3000

server_socket = socket.socket(socket.AF_INET)
server_socket.bind((ip,port))
server_socket.listen(1)

print('Waiting Client...')

client_socket, addr = server_socket.accept()
print('Connet Client!!')

data = client_socket.recv(1024)
encoded_img = np.fromstring(data,dtype = np.uint8)
image = cv2.imdecode(encoded_img,cv2.IMREAD_COLOR)

How can I send and receive images between clients and servers?

Answer 1

Note that you are not sending any data, just creating a connection.

You can refer to this example of how to send data from kotlin: How to send and receive strings through TCP connection using kotlin

And this example of how to receive data in python: https://docs.python.org/3/library/socket.html#example