.NET/Java PDF, Tiff, Barcode SDK Library

This web service will provide a web method that makes a call to the Yahoo iFinance server on your behalf, takes the CSV that is returned from it, and serializes it as a DataTable. It is designed to be consumed by a .NET-based client, so using a DataTable object works nicely. If you want to expose a web service that is easily interoperable with other platforms, you should serialize the returned data using straight XML that can be parsed on the client side. Here is the code for the web method: [WebMethod] public DataTable GetFullPriceHistory(string strTicker, int nDays) { WebClient client = new WebClient(); StringBuilder strURI = new StringBuilder("http://ichart.finance.yahoo.com/table.csv s="); strURI.Append(strTicker);

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running Windows, but for many applications that s a reasonable assumption. Assuming clients are running Windows, the main downside of this kind of application is that it s hard to control deployment compared to a web application. With web applications, you only have to update an application on the server, and all your clients will be using the new version the next time they request a new page.

Let s see how the application icon is set. Unix binaries don t know about the concept resources of icons. Instead, a desktop entry file is used to describe each application. These files have the file name extension of desktop and are usually stored in $XDG_DATA_DIRS/ applications or /usr/share/applications. An example file is shown in Listing 15-2. Listing 15-2. An example desktop file for the myapplication project [Desktop Entry] Type=Application Name=My Application Exec=myapplication %F MimeType=image/x-mydata; Icon=/install/path/myicon.png In the listing, the line reading [Desktop Entry] tells you that what follows is an entry for a desktop entry. Next is Type, which tells you that the entry will describe an application. According to Name, the application is called My Application. The Exec line tells the desktop what command to issue to start the application; in this case, it is myapplication. The %F part tells the desktop where to list the file names if a user starts the application by trying to open one or

Out-of-browser Internet applications could well blur this distinction. Both Silverlight and Flash make it possible for Internet applications to have parts that are installed on the user s machine and run like normal applications outside the web browser. So the considerations in this section could apply if that s the sort of web application you re building.

To update a classic Windows application, you need to somehow get a new version of the program onto the end users machines. Since it s rarely practical to install a new version on every single user s machine simultaneously, you need to handle the possibility of having several different versions of the client software all trying to talk to your server. The extent to which this can cause problems will depend on how much control you have over the client computers.

Some applications are deployed in tightly controlled environments. For example, suppose you re writing a line-of-business application in WPF that will only ever be deployed to machines owned by your business. If your IT department has an iron grip on the company s computers, you might be able to exert considerable control over what versions of your application are out there. Network administrators could forcibly upgrade users to the latest version. So new versions might overlap with old versions for only a day or so. You could even go further and arrange for your application to check for updates and refuse to continue running when a newer version is available. This is a happy situation for a developer, because it makes it much easier to introduce changes to your server. Chances are that at some point you ll want to add new services to support new features in your application. You might also want to modify existing services, which is usually more problematic than completely new features if you re using WCF, it s not easy to modify the way an existing service works without breaking that service for older clients. It s possible, but it s hard, and it s often easier to run multiple versions of the service simultaneously during the transition period. The nice thing about having sufficient control to remove old versions of the application is that you can know when you ve reached the end of a transition period and can shut down the older version of the service. This won t be the case if you can t force that sort of change on the client.