英文:
Flutter - How can I interrupt when I receive UDP data?
问题
我想在从UDP接收到数据时执行某种函数，但我不知道应该如何在不挂起主代码、创建监听循环或创建定时器的情况下等待数据。请问我该如何做？
英文:
I would like to execute some kind of function when I receive some data from UDP but I dont know exactly how I should I wait for the data whitout suspending the main code or creating a loop for listening or creating a timer. How can I do it, please?
答案1
得分: 0
要在Flutter应用程序中中断或处理传入的UDP数据，您可以使用dart:io库创建一个UDP套接字并监听数据。以下是如何实现的逐步指南：
- 导入必要的库：
import 'dart:io';
import 'dart:convert';
- 创建一个UDP套接字并将其绑定到特定端口：
RawDatagramSocket socket = await RawDatagramSocket.bind(InternetAddress.anyIPv4, 12345);
在此示例中，套接字绑定到任何可用的IPv4地址上的端口12345。您可以将端口号更改为所需的值。
- 在套接字上监听传入数据：
socket.listen((RawSocketEvent event) {
if (event == RawSocketEvent.read) {
Datagram datagram = socket.receive();
if (datagram != null) {
String message = utf8.decode(datagram.data);
// 处理接收到的消息
print('Received message: $message');
}
}
});
socket.listen()方法用于监听套接字上的事件。在这种情况下，我们对RawSocketEvent.read事件感兴趣，该事件在有数据可读时发生。当接收到数据时，我们使用socket.receive()来获取数据，使用UTF-8编码将其解码为字符串，并根据需要处理它。
- 要停止监听并关闭套接字，请使用close()方法：
socket.close();
当您不再需要监听传入UDP数据时应执行此操作。
请确保在您的代码中适当处理错误和异常。
通过这些步骤，您可以通过创建UDP套接字并在其上监听事件来中断或处理Flutter应用程序中传入的UDP数据。
英文:
To interrupt or handle incoming UDP data in a Flutter application, you can use the dart:io library to create a UDP socket and listen for data. Here's a step-by-step guide on how to achieve this:
- Import the necessary libraries:
import 'dart:io';
import 'dart:convert';
- Create a UDP socket and bind it to a specific port:
RawDatagramSocket socket = await RawDatagramSocket.bind(InternetAddress.anyIPv4, 12345);
In this example, the socket is bound to port 12345 on any available IPv4 address. You can change the port number to your desired value.
- Listen for incoming data on the socket:
socket.listen((RawSocketEvent event) {
if (event == RawSocketEvent.read) {
Datagram datagram = socket.receive();
if (datagram != null) {
String message = utf8.decode(datagram.data);
// Handle the received message
print('Received message: $message');
}
}
});
The socket.listen() method is used to listen for events on the socket. In this case, we're interested in the RawSocketEvent.read event, which occurs when data is available to read. When data is received, we retrieve it using socket.receive(), decode it to a string using UTF-8 encoding, and handle it as needed.
- To stop listening and close the socket, use the close() method:
socket.close();
This should be done when you no longer need to listen for incoming UDP data.
Remember to handle errors and exceptions appropriately in your code.
With these steps, you can interrupt or handle incoming UDP data in your Flutter application by creating a UDP socket and listening for events on it.
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