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Encoder QR-Code in Java Now that we have chosen our technique, let s move on to developing the example.

Now that we have chosen our technique, let s move on to developing the example.
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Generating newsfeeds with C#
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8.5.1 Implementing the File Depot in C#
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As in the Java version of this example, we need a File Depot. In the .NET version, the depot interface is defined in IDepot.cs and the implementation is in FileDepot.cs. Below is the IDepot interface:
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using System; using System.Collections; namespace BlogApps_08 { public interface IDepot { ICollection getFiles(); DateTime getLastUpdateTime(); void update(); } }
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The implementation of the IDepot interface is not central to the topic at hand, so we won t discuss it here. Full source code is included in the examples directory that accompanies this chapter. With our File Depot in place, we can look at how to generate a newsfeed.
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8.5.2 Generating the File Depot newsfeed in C#
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To support both static and dynamic newsfeed generation, we ll create a newsfeed writer class called DepotRSSWriter. The writer does not depend on the ASP NET environment, so it may be used to generate static newsfeeds outside of . that environment, or dynamic newsfeeds from within an ASP.NET page. We will illustrate that in a moment, but first let s take a closer look at the source code for DepotRSSWriter, which is shown in listing 8.3.
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Listing 8.3 DepotRSSWriter.cs
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using using using using using System; System.IO; System.Xml; System.Text; System.Collections;
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namespace BlogApps_08 { public class DepotRSSWriter { private IDepot m_Depot = null; public DepotRSSWriter(IDepot depot) { m_Depot = depot; } public void write(XmlTextWriter writer, string baseURL) {
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writer.Formatting = Formatting.Indented; writer.Indentation = 4;
D E F
writer.WriteStartDocument(); writer.WriteStartElement("rss"); writer.WriteAttributeString("version", "2.0"); writer.WriteStartElement("channel"); writer.WriteElementString("lastBuildDate", m_Depot.getLastUpdateTime().ToString("r")); writer.WriteElementString("title", "File Depot Newsfeed"); writer.WriteElementString("description", "Newly uploaded files in the File Depot"); writer.WriteElementString("link", baseURL); ICollection items = m_Depot.getFiles(); foreach(FileInfo fileInfo in m_Depot.getFiles()) {
String url = baseURL + fileInfo.Name; writer.WriteStartElement("item"); writer.WriteElementString("title", fileInfo.Name); writer.WriteElementString("link", url); writer.WriteElementString("description", "Click <a href='"+url+"'>" + fileInfo.Name + "</a> to download the file"); writer.WriteElementString("pubDate", fileInfo.LastWriteTime.ToString("r")); writer.WriteEndElement(); } writer.WriteEndElement(); writer.WriteEndElement(); }
static void Main(string[] args) { System.Console.WriteLine("File Depot Newsfeed RSS Writer"); if (args.Length != 3) { System.Console.WriteLine( "USAGE: DepotRSSWriter [depotDir] [depotUrl] [file]"); return; } string depotDir = args[0]; string outputPath = args[2];
IDepot depot = new FileDepot(depotDir); DepotRSSWriter depotWriter = new DepotRSSWriter(depot); FileStream stream = new FileStream(outputPath, FileMode.Create); XmlTextWriter writer = new XmlTextWriter(stream, Encoding.UTF8);
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string baseURL = args[1]; depotWriter.write(writer, baseURL); } } }
Let s discuss the code in detail. First, we define the DepotRSSWriter class and its constructor b. To create a DepotRSSWriter, you must provide a File Depot object that implements the IDepot interface. Next, we define the write() method C, which accepts two arguments. These are the XmlTextWriter to which the RSS newsfeed is to be written and the base URL to be used in the generated newsfeed. Inside the write() method, we set up pretty printing D and start generating the newsfeed by writing out the root <rss> element using the writer s WriteStartElement() method and the element s version attribute using WriteAttributeString() E. Inside the <rss> element, we write the <channel> element and its children F. We call the depot to get the value for the <lastBuildDate> element, use the base URL for the <link> element, and make up some appropriate values for the title and description. To create the <item> elements inside the <channel> element, we use a foreach loop to iterate through the FileInfo objects from the depot s collection G. Inside the loop, we write out the <item> element for the current file H. We form the link for the file by appending the filename to the base URL, and we also use the filename as the item s title. The item description includes HTML, but we do not need to escape the angle brackets because the XmlTextWriter will do that for us I. Finally, we use the writer s WriteEndElement() method to end the elements we started J. The write() method can be called from an ASP.NET web application, but we also want to be able to call it from the command line, so we define a standard C# Main() method 1) . The user must pass in the three command-line parameters below, and if she does not do so, we print out a usage message to help her along 1!.
depotDir The full path to the directory in which the File Depot files exist depotUrl The base URL where the File Depot is made available on the Web file The filename of the newsfeed file to be generated
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