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

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Punit Gandhi
Punit Gandhi 2015-4-14
评论： Nishant Kumar 2015-5-1
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.

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采纳的回答

Jan
Jan 2015-4-14
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
  1 个评论
Punit Gandhi
Punit Gandhi 2015-4-15
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)

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