Can't get data from Yahoo weather.

charleswho

I wanna get 7-day weather forcast data from Yahoo weather. I tried a thousand times but it simply does' t work. I cannot even make it with the following code. Could somebody help me with that? I appreciate it so much. I am using Processing 3.2.1 and windows 10.

                void setup(){
                  XML xml = loadXML("https:"+"//query.yahooapis.com/v1/public/yql?q=select%20*%20from%20weather.forecast%20where%20woeid%3D4177");

                 XML yweather = xml.getChild("channel/item/yweather:condition");

                  int weatherCondition = yweather.getInt("code");

                  // Print the results
                  println(weatherCondition);

                }

I tried example code from processing.org and it did work.

                // The following short XML file called "mammals.xml" is parsed 
                // in the code below. It must be in the project's "data" folder.
                //
                // <?xml version="1.0"?>
                // <mammals>
                //   <animal id="0" species="Capra hircus">Goat</animal>
                //   <animal id="1" species="Panthera pardus">Leopard</animal>
                //   <animal id="2" species="Equus zebra">Zebra</animal>
                // </mammals>

                XML xml;

                void setup() {
                  xml = loadXML("mammals.xml");
                  XML[] children = xml.getChildren("animal");

                  for (int i = 0; i < children.length; i++) {
                    int id = children[i].getInt("id");
                    String coloring = children[i].getString("species");
                    String name = children[i].getContent();
                    println(id + ", " + coloring + ", " + name);
                  }
                }

                // Sketch prints:
                // 0, Capra hircus, Goat
                // 1, Panthera pardus, Leopard
                // 2, Equus zebra, Zebra

And then I saved the weather data as xml file and load it in Processing. It still says Null Pointer Exception. Also I tried Yahoo Weather Library from com.onformative.yahooweather. But it doen' t have 7-day forcast. Thanks for your help!

koogs

Edit post, highlight code, press ctrl-o

Andreas_Ref

Perhaps check out https://github.com/processing/processing/files/231534/XMLYahooWeather3.zip

koogs

if you just hit the link in a bowser...

https://query.yahooapis.com/v1/public/yql?q=select * from weather.forecast where woeid=4177

you'll see the returned xml looks like

<?xml version="1.0" encoding="UTF-8"?>
<query xmlns:yahoo="..." yahoo:count="1" yahoo:created="2016-08-31T09:35:56Z" yahoo:lang="en-US">
  <results>
    <channel>
      ,,,
      <item>
        ...
        <yweather:condition ... code="33"... />

there's an extra 'results' in there. so you want

XML yweather = xml.getChild("results/channel/item/yweather:condition");

and not

XML yweather = xml.getChild("channel/item/yweather:condition");

charleswho

Thanks!