.NET/Java PDF, Tiff, Barcode SDK Library

The first step in choosing the right networking API is to decide on the nature of the communication your application requires. There are many different styles of distributed applications. Perhaps you are building a public-facing web service designed to be used by a diverse range of clients. Conversely, you might be writing client code that uses someone else s web service. Or maybe you re writing software that runs at both ends of the connection, but even then there are some important questions. Are you connecting a user interface to a service in a tightly controlled environment where you can easily deploy updates to the client and the server at the same time Or perhaps you have very little control over client updates maybe you re selling software to thousands of customers whose own computers will connect back to your service, and you expect to have many different versions of the client program out there at any one time. Maybe it doesn t even make sense to talk about clients and servers you might be creating a peer-to-peer system. Or maybe your system is much simpler than that, and has just two computers talking to each other.

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The variations are endless, so no single approach can work well for all systems. The next few sections will look at some common scenarios, and discuss the pros and cons of the various networking options .NET offers. Even within a specific scenario there will often be more than one way to make things work. There are no hard-and-fast rules, because each project has different requirements. So this section won t tell you what to do it ll just describe the issues you ll need to consider. Ultimately, only you can decide on the right solution for your system. We ll start with a very common web-based scenario.

The price history pane on the page renders the 100-day price history (the closing price for the stock over the past 100 days) in a simple text table. You can see it in Figure 11-9.

Web user interfaces have been getting smarter lately A few years ago, most of a web application s logic would live on the server, with client-side code in the web browser typically doing little more than making buttons light up and menus fly out in response to the mouse But now, we expect more from our web user interfaces Whether you use AJAX (Asynchronous JavaScript and XML), or a RIA (Rich Internet Application) technology such as Silverlight or Flash, web applications often communicate constantly with the web server, and not just when navigating between pages If you re writing the server-side parts of this sort of application in C#, you will typically use ASPNET to provide a web user interface.

But what should you use for programmatic communication the messages that flow between the web UI and the server once a page is already loaded WCF is a flexible choice here, because as Figure 13-1 illustrates, you can make a single set of remote services accessible to many common browser-based user interface technologies A WCF service can be configured to communicate in several different ways simultaneously You could use JSON (JavaScript Object Notation), which is widely used in AJAX-based user interfaces because it s is a convenient message format for JavaScript client code Or you could use XML-based web services Note that using WCF on the server does not require WCF on the client These services could be used by clients written in other technologies such as Java, as long as they also support the same web service standards as WCF.

The application icon on Windows is represented by a Windows resource (not to be confused with Qt resources), so you have to create a Windows resource file and add it to the Qt project file. First you need to create an icon with the ico file format. There are many tools for creating these files (examples include the Gimp and the icon editor in Visual Studio, but searching the Internet shows numerous alternatives). After you create an icon, you need to create the Windows resource file, which is a file with the file extension rc. The file should consist of the following line. IDI_ICON1 ICON DISCARDABLE "filename.ico" Replace filename.ico with your icon. To add the resource file to your project file, simply add a line reading RC_FILE += filename.rc, where filename.rc is your Windows resource file. There is no need to prefix this line with a win32 scope because it is ignored on the platforms where it does not apply.

Looking specifically at the case where your web application uses C# code on the client side, this would mean using either Silverlight or WPF (You can put WPF in a web page by writing an XBAP a Xaml Browser Application This will work only if the end user has WPF installed) If you re using C# on both the client and the server, the most straightforward choice is likely to be WCF on both ends What if your server isn t running NET, but you still want to use NET on the web client There are some restrictions on WCF in this scenario Silverlight s version of WCF is much more limited than the version in the full NET Framework whereas the full version can be configured to use all manner of different protocols, Silverlight s WCF supports just two options.

There s the so-called basic profile for web services, in which only a narrow set of features is available, and there s a binary protocol unique to WCF,.