How to reiterate the function automatically if my code stops working because my internet disconnected

Hello,

I want to get weather data from a URL given below:

 xdom = xmlread('http://api.openweathermap.org/data/2.5/forecast?   q=Texel,NL&mode=xml&APPID=f3e1e8697d3d20e5d91f193ef02e4846')

Now my whole code is running properly, but due to bad internet connection my code stopped. To safeguard my whole code that it doesn't happen again, I want to develop a code which will help in reiterating the code after every 30 seconds until the internet connection is restored. Can someone help me with the same.

[Nishant Kumar]

use this function with try catch.

Answer 1

[Jan]

How does this code stop? With an error message? Then TRY-CATCH is a direct solution:

success = false;
while ~success
  try
     xdom    = xmlread('...');
     success = true;
  catch ME
     disp('Failed:');
     disp(ME.message);
     pause(30);
  end
end

[Punit Gandhi]

Hey Jan,

Thanks for the code. It works perfectly. It shows me this error when internet connection is not working.

>> isnet Failed: Java exception occurred: java.net.UnknownHostException: api.openweathermap.org

at java.net.PlainSocketImpl.connect(Unknown Source)

at java.net.SocksSocketImpl.connect(Unknown Source)

at java.net.Socket.connect(Unknown Source)

at java.net.Socket.connect(Unknown Source)

at sun.net.NetworkClient.doConnect(Unknown Source)

at sun.net.www.http.HttpClient.openServer(Unknown Source)

at sun.net.www.http.HttpClient.openServer(Unknown Source)

at sun.net.www.http.HttpClient.<init>(Unknown Source)

at sun.net.www.http.HttpClient.New(Unknown Source)

at sun.net.www.http.HttpClient.New(Unknown Source)

at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source)

at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)

at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source)

at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)

at org.apache.xerces.impl.XMLEntityManager.setupCurrentEntity(Unknown Source)

at org.apache.xerces.impl.XMLVersionDetector.determineDocVersion(Unknown Source)

at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)

at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)

at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)

at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)

at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)

at javax.xml.parsers.DocumentBuilder.parse(Unknown Source)