Question

我试图运行＆＃39; checkServer＆＃39;以5秒的间隔。但是服务器很好＆＃39;只运行一次。重复这个功能需要做些什么？

import 'dart:io';
import 'dart:uri';
import 'dart:isolate';

checkServer() {
  HttpClient client = new HttpClient();
  HttpClientConnection connection = client.getUrl(...);

  connection.onResponse = (res) {
    ...
    print('server is fine');
    //client.shutdown();
  };

  connection.onError = ...;
}

main() {
  new Timer.repeating(5000, checkServer());
}

Answer 1

您必须为void callback(Timer timer)构造函数提供Timer.repeating作为第二个参数。

使用以下代码，将每5秒调用checkServer。

checkServer(Timer t) {
  // your code
}

main() {
  // schedule calls every 5 sec (first call in 5 sec)
  new Timer.repeating(5000, checkServer);

  // first call without waiting 5 sec
  checkServer(null);
}

飞镖服务器每隔一段时间检查

1 个答案: