flutter dart 에서 hexString 을 byte 로 변환 (소켓한번만연결)

목적 : flutter 에서 hexString 을 byte 로 변환하여 접속된 소켓으로 보내려고 한다.

javascript 에서는 hexString 을 Uint8Array 로 변환한다. (arrayBuffer)

# inutString
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

hex package install

 $ flutter pub add hex

pubspec.yaml   hex: ^0.2.0 추가됨

dependencies:
  flutter:
    sdk: flutter
 
 
  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.2
  hex: ^0.2.0

 

:: chatGPT ::

 

현재 mymq 연결하여 응답까지 받아오는것 까지 했음

전체소스 

import 'dart:io';
import 'dart:typed_data';
import 'package:hex/hex.dart';
 
void main() async {
  // const String host = "220.72.212.";  // php server
  // const int port = 25003;
 
  const String host = "13.125.57.";  // mymq
  const int port = 9001;
 
 
  // connect to the socket server
  final socket = await Socket.connect(host, port);
  print('Connected to: ${socket.remoteAddress.address}:${socket.remotePort}');
 
  // listen for responses from the server
  socket.listen(
 
    // handle data from the server
    (Uint8List data) {
      //final serverResponse = String.fromCharCodes(data);
      //print('Server: $serverResponse');
      String hexString = HEX.encode(data);
      print(hexString);
    },
 
    // handle errors
    onError: (error) {
      print(error);
      socket.destroy();
    },
 
    // handle server ending connection
    onDone: () {
      print('Server left.');
      socket.destroy();
    },
  );
 
 
  // send bytes
  const String hexString = "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";
  List<int> bytes = HEX.decode(hexString);
  print(bytes);
  socket.add(bytes);
 
  // send String
  // await sendMessage(socket, "hellow world");
 
}
/*
 
Future<void> sendMessage(Socket socket, String message) async {
  print('Client: $message');
 
  */
/**
   * write : 문자열
   * add : 바이트
   *//*
 
  // socket.write(message);
  socket.add(message as List<int>);
  await Future.delayed(Duration(seconds: 2));
}*/

:: 응답 ::

 

앞으로 개발해야 될 사항 

• flutter socket 연결후 데이타 계속 보내기 mymq 연결후 데이터 응답받음
• 소켓연결하고 웹뷰연결하여 소켓접속하여 응답받는 소스 샘플

 

https://pub.dev/packages/hex/install

 

hex | Dart Package