49 UDP

Hard

Cangjie also supports UDP transmision protocol. For more information see the official docs

Set the server port. Function to create UDP server

Initilize UDP socket

Bind the socket to our IP.

Read the data transmited, we also accquire information about who sent use the messages.

Run the server asynchronously

Bind the socket to our IP. Send messages to the IP address (local host) on the specified port.

UDP.cj

import std.socket.*
import std.time.*
import std.sync.*

let SERVER_PORT: UInt16 = 8080

func runUdpServer() {
    try (serverSocket = UdpSocket(bindAt: SERVER_PORT)) {
        serverSocket.bind()

        let buf = Array<Byte>(3, item: 0)
        let (clientAddr, count) = serverSocket.receiveFrom(buf)
        let sender = clientAddr.hostAddress
        println("Server receive ${count} bytes: ${buf} from ${sender}")
    }
}

main() {
    let future = spawn {
        runUdpServer()
    }

    sleep(Duration.second)

    try (udpSocket = UdpSocket(bindAt: 0)) {
        udpSocket.sendTimeout = Duration.second * 2
        udpSocket.bind()
        udpSocket.sendTo(
            SocketAddress("127.0.0.1", SERVER_PORT),
            Array<Byte>([1, 2, 69])
        )
    }

    future.get()
}