在Flutter应用中使用Socket?
我创建了Flutter应用。我需要将我的应用程序连接到本地网络套接字服务。如下所示,我可以使用telnet
Connect,发送数据和从服务器接收数据。我使用Flutter
web_socket插件和示例。我可以连接到服务器并发送数据,但是我无法捕获(或获取数据,它什么也没显示。)数据。在Flutter的Google网上论坛中,有人建议我使用流而不是StreamBuilder。
To send data I use; Q101:_:49785:_:ABCDEAnd receive data I get; 1:_:2:_:119351:_:NİYAZİ TOROS
当我使用此示例(https://flutter.io/cookbook/networking/web-
sockets/)时,我的套接字服务出现错误:
Q: 28.06.2018 08:53:57->GET / HTTP/1.1A: 28.06.2018 08:53:57 ->:1:_:1:_:FAIL1
Last login: Tue Jun 26 15:01:44 on ttys000Niyazis-MBP:~ niyazitoros$ telnet
telnet> telnet 192.168.1.22 1024
Trying 192.168.1.22...
Connected to 192.168.1.22.
Escape character is '^]'.
Q101:_:49785:_:*************
1:_:2:_:119351:_:NİYAZİ TOROS
基于@Richard Heap的建议:
import 'dart:async';import 'dart:convert';
import 'dart:io';
void connect(InternetAddress clientAddress, int port) {
Future.wait([RawDatagramSocket.bind(InternetAddress.anyIPv4, 0)]).then(
(values) {
RawDatagramSocket _socket = values[0];
_socket.listen((RawSocketEvent e) {
print(e);
switch (e) {
case RawSocketEvent.read:
Datagram dg = _socket.receive();
if (dg != null) {
dg.data.forEach((x) => print(x));
}
_socket.writeEventsEnabled = true;
break;
case RawSocketEvent.write:
_socket.send(
new Utf8Codec().encode('Hello from client'), clientAddress, port);
break;
case RawSocketEvent.closed:
print('Client disconnected.');
}
});
});
}
main(List<String> arguments) {
print("Connecting to server..");
var address = new InternetAddress('192.168.1.22');
int port = 1024;
connect(address, port);
}
我得到这个:
/Users/niyazitoros/flutter/bin/cache/dart-sdk/bin/dart --enable-asserts --enable-vm-service:59683 /Users/niyazitoros/IdeaProjects/github/untitled/bin/main.dartObservatory listening on http://127.0.0.1:59683/
Connecting to the server.
RawSocketEvent.write
回答:
正如attdona所说,
您的服务器不会使用websocket协议,但是会公开一个纯TCP套接字。
所以你需要一个TCP套接字,并有一个伟大的教程Sockets
和ServerSockets
,你可以找到这里。
这是一个片段:
import 'dart:io';import 'dart:async';
Socket socket;
void main() {
Socket.connect("localhost", 4567).then((Socket sock) {
socket = sock;
socket.listen(dataHandler,
onError: errorHandler,
onDone: doneHandler,
cancelOnError: false);
}).catchError((AsyncError e) {
print("Unable to connect: $e");
});
//Connect standard in to the socket
stdin.listen((data) => socket.write(new String.fromCharCodes(data).trim() + '\n'));
}
void dataHandler(data){
print(new String.fromCharCodes(data).trim());
}
void errorHandler(error, StackTrace trace){
print(error);
}
void doneHandler(){
socket.destroy();
}
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