garyshort.org

…and, as usual, the guys at the National Oceanic & Atmospheric Administration have their eye on what’s going on. They provide several feeds detailing the hurricane situation. You can find them here.

I’ve written a little web page that makes use of the feed, just to show you how to consume it. The code’s below and is fairly self explanatory.

protected void Page_Load(object sender, EventArgs e)
{
    //GS - Remove any content already written to the buffer
    Response.Clear();

    //GS - Write the html header
    Response.ContentType = "text/html";

    //GS - Open the RSS feed
    XPathDocument xpd = null;
    try
    {
        xpd = 
            new XPathDocument(@"http://www.nhc.noaa.gov/index-at.xml");
    }
    catch (XmlException xe)
    {
        Response.Write("The following xml error occurred: " + xe.Message);
        Response.End();
    }

    //GS - Create a navigator
    XPathNavigator xpn = xpd.CreateNavigator();

    //GS - Get the URL to the logo of NOAA
    try
    {
        XPathNavigator Node = 
            xpn.SelectSingleNode(@"/rss/channel/image/url");

        //GS - Write the image
        Response.Write("<img src='" + Node.InnerXml + "' /><p />");

        //GS - Get the title
        Node = xpn.SelectSingleNode(@"/rss/channel/title");

        //GS - Write the out the title
        Response.Write("<h1>" + Node.InnerXml + "</h1>");

        //GS - Get the subtitle
        Node = xpn.SelectSingleNode(@"/rss/channel/description");

        //GS - Write out the subtitle
        Response.Write("<h2>" + Node.InnerXml + "</h2>");

        //GS - Get all the items
        XPathNodeIterator xpni = xpn.Select(@"/rss/channel/item");

        //GS - Start an unordered list
        Response.Write("<ul>");

        //GS - Add each item to the list
        string title = "";
        string url = "";
        while (xpni.MoveNext())
        {
            if (xpni.Current.MoveToFirstChild())
            {
                title = xpni.Current.InnerXml;

                if (xpni.Current.MoveToNext())
                {
                    url = xpni.Current.InnerXml;
                }
            }

            Response.Write("<li><a href='" + url + "'>" +
                title + "</a></li>");
        }
    
	//GS - Close the unordered list
	Response.Write("</ul>");

	//GS - We're done. Flush and close the buffer.
	Response.End();
    }
    catch (XPathException xpe)
    {
        Response.Write("The following XPathException occurred: " + 
            xpe.Message);
        Response.End();
    }
}

Tags: Hurricanes, RSS, C#

Print | posted on Monday, June 12, 2006 2:06 PM