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This chapter discusses how to build connected applications using Microsoft Silverlight. Silverlight offers a number of data connectivity application programming interfaces (APIs), and you get a good look at how to use them to connect to a hosted service and retrieve its data. You start with the simplest means of connection in Silverlight, the WebClient class, and then delve into how to override the simple functionality using the HttpWebRequest and HttpWebRespose classes. In addition, you examine connecting to existing Web and Windows Communication Foundation (WCF) services using proxies generated by Microsoft Visual Studio. Finally, in addition to these technologies you look into what it takes to allow for crossdomain access in your Silverlight application using the cross-domain policy files. To be able to connect to a service, you need a service to connect to, so each technology discussion also involves looking at building a live service that handles your requests and dispatches data back to you.

internal sealed class PipeClient { // Each client object performs asynchronous operations on this pipe private readonly NamedPipeClientStream m_pipe; public PipeClient(String serverName, String message) { m_pipe = new NamedPipeClientStream(serverName, "Echo", PipeDirection.InOut, PipeOptions.Asynchronous | PipeOptions.WriteThrough); m_pipe.Connect(); // Must Connect before setting ReadMode m_pipe.ReadMode = PipeTransmissionMode.Message; // Asynchronously send data to the server Byte[] output = Encoding.UTF8.GetBytes(message); m_pipe.BeginWrite(output, 0, output.Length, WriteDone, null); } private void WriteDone(IAsyncResult result) { // The data was sent to the server m_pipe.EndWrite(result);

There's still a chance that you will get fewer rows than the number you requested, but you're guaranteed not to get more. By specifying a higher value in the TABLESAMPLE clause, you increase the likelihood of getting the number of rows you are after. If you need to get repeatable results, use a clause called REPEATABLE which was designed for this purpose, providing it with the same seed in all invocations. For example, running the following query multiple times will yield the same result, provided that the data in the table has not changed: SELECT * FROM dbo.Orders TABLESAMPLE (1000 ROWS) REPEATABLE(42);

Qt uses the QAbstractItemModel to encapsulate the full flexibility of a tree of tables; normally, a QAbstractListModel or QAbstractTableModel suffices, hiding the complexity of the tree unless you really need it In most cases, you don t even need to create your own model; instead you can use a QStringListModel for a one-dimensional list of QStrings, or a QStandardItemModel for one- or two-dimensional array, as well as data structured in a hierarchy The two-dimensional nature of the QTableModel is strongly reminiscent of a SQL database s tables, and it almost immediately comes to mind when you have data organized in rows with different facets of the data in each column It shouldn t, however in a Qt table model, each cell in the table is independent of every other cell Think of a Qt table like a financial spreadsheet (not a well-formatted list!).

InitializeExpenseData( expenseData ) ComputeMarketingExpense( expenseData ) ComputeSalesExpense( expenseData ) ComputeTravelExpense( expenseData ) ComputePersonnelExpense( expenseData ) DisplayExpenseSummary( expenseData )

Instead, if you have a list of items with different data per item say, a list of location names with latitudes and longitudes each location is a single item in a list To provide access to different facets of a single item, Qt provides roles A role is a constant in an enumeration, and models return different data depending on the role you pass when you interrogate the model Qt defines several roles by default defined by the Qt::ItemDataRole enumeration, including: Qt::DisplayRole, indicating the primary visible facet of a datum Qt::DecorationRole, indicating a decoration (such as an icon) for a datum Qt::EditRole, indicating the primary editable facet of a datum Qt::SizeHintRole, indicating the desired size of the item for display layout purposes (this is the size the layout will try to accommodate, rather than the actual object s size).

Qt::CheckStateRole, indicating whether the item is marked in some way (say, a list item bearing a check mark) So, for example, the QListView uses the Qt::DisplayRole to indicate to the model what data is requested for display for each item You can define your own roles, too, if you need to represent different kinds of data and find the Qt roles limiting in the kind of data being represented; just be sure that your first role has a value greater than Qt::UserRole When you set or get data from a model, you do so using a QModelIndex that indicates which datum you re interacting with as well as Qt s QVariant class The QVariant class is a type-safe wrapper for most C++ and all Qt value types, including integers, floatingpoint numbers, and strings.

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