尝试跟随 https://flutter.dev/docs/cookbook/networking/web-sockets
一个简约的flutter程序，试图向我的服务器发送消息:
import 'package:flutter/material.dart';
import 'package:web_socket_channel/web_socket_channel.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
void sendMessage(String message){
final channel = WebSocketChannel.connect(
Uri.parse('ws://192.1XX.XX.XX:5000'),);
channel.sink.add(message);
return;}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
Text('Dor'),
TextButton(onPressed: (){
sendMessage('Message text should go here');
}, child: Text('PressMe'))
],
),
),
);
}
}
但是，这不会向我的服务器发送任何内容。没有错误消息，因此调试具有挑战性...... 服务器正在工作，因为以下客户端代码确实将数据发送到我的服务器:
<html>
<head>
<title>Chat Room</title>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/4.3.2/socket.io.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
</head>
<body>
<script type="text/javascript">
$(document).ready(function() {
var socket = io.connect('ws://192.XXX.XX.XX:5000');
socket.on('connect', function() {
socket.send('User has connected!');
});
socket.on('message', function(msg) {
$("#messages").append('<li>'+msg+'</li>');
console.log('Received message');
});
$('#sendbutton').on('click', function() {
socket.send($('#myMessage').val());
$('#myMessage').val('');
});
});
</script>
<ul id="messages"></ul>
<input type="text" id="myMessage">
<button id="sendbutton">Send</button>
</body>
</html>
但为了以防万一您需要它，这是我的服务器的代码:
from flask import Flask
from flask_socketio import SocketIO, send
app = Flask(__name__)
app.config['SECRET_KEY'] = 'mysecret'
socketio = SocketIO(app, cors_allowed_origins='*')
@app.route('/hello')
def say_hello():
return 'HTTP is working!'
@socketio.on('message')
def handleMessage(msg):
print('Message: ' + msg)
send(msg, broadcast=True)
if __name__ == '__main__':
socketio.run(app,host='0.0.0.0',port=5000)
最佳答案
您的服务器实现 Socket.IO协议(protocol)，与 WebSocket 不同。如果您的 flutter 应用程序打算连接到 Socket.IO 服务器，则应使用 Socket.IO 客户端。
关于Flutter 的 web_socket_channel 静默失败，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/69616633/