.NET/Java PDF, Tiff, Barcode SDK Library

To test the UDP server and client, start and stop both applications independently of each other. You will then see that the clients and server are truly independent. As soon as a server starts broadcasting, the clients will start receiving. As soon as a client is started, it also starts receiving. Neither cares whether the other is active. Although the client is pretty straightforward, as is the server, it can be helpful to end the images so that each client would know when it has received the full image. When looking at the whole, the protocol is what is important. Right now, you can broadcast only one image at a time (perhaps a unique image identifier value should have been prepended to each datagram so that several images could be broadcast at once). By sending a checksum for the entire image at the end of each datagram, the clients would be sure that they had the right image when they saw the whole (or could discard the datagrams with incorrect checksums). It is also important to consider what happens if a network connection is closed and later reopened. How does this affect the data received by the clients and, more importantly, how do the clients present this to the users Because the UDP protocol doesn t guarantee any data to arrive, or which data, or in which order, it is important to consider these limitations when designing the contents of the datagrams.

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}

Once the update is complete, the extended price information appears, as shown in Figure 11-7.

}; return customers;

EmailAddress = "orlando0@hotmail.com"}, new Customer { FirstName = "Keith", LastName = "Harris", EmailAddress = "keith0@hotmail.com" }, new Customer { FirstName = "Donna", LastName = "Carreras", EmailAddress = "donna0@hotmail.com" }, new Customer { FirstName = "Janet", LastName = "Gates", EmailAddress = "janet1@hotmail.com" }, new Customer { FirstName = "Lucy", LastName = "Harrington", EmailAddress = "lucy0@hotmail.com" }

We re not really doing anything special here this LINQ query is just relying on plain old LINQ to Objects the same techniques we already saw in 8. But this is only half the story. LINQ to XML is not just about creating XML. It also supports reading XML. Being able to create XML documents to store data to be processed or exchanged is great, but it would not be of much use if you could not find information in them easily. LINQ to XML lets you use the standard LINQ operators to search for information in XML documents.

Summary

We ll need an example document to search through. Here s the document from Example 12-3, reproduced here for convenience:

<Customers> <Customer FirstName="Orlando" LastName="Gee"> <EmailAddress>orlando0@hotmail.com</EmailAddress> </Customer> <Customer FirstName="Keith" LastName="Harris"> <EmailAddress>keith0@hotmail.com</EmailAddress> </Customer> <Customer FirstName="Donna" LastName="Carreras"> <EmailAddress>donna0@hotmail.com</EmailAddress> </Customer> <Customer FirstName="Janet" LastName="Gates"> <EmailAddress>janet1@hotmail.com</EmailAddress> </Customer> <Customer FirstName="Lucy" LastName="Harrington"> <EmailAddress>lucy0@hotmail.com</EmailAddress> </Customer> </Customers>

using using using using System; System.Collections.Generic; System.Linq; System.Xml.Linq;

When using the networking module of Qt, you can choose the level on which you want to control the operations If you need to only fetch files or make requests that can be handled via FTP or HTTP use the QHttp and QFtp classes These classes take care of many details and pro, vide you with high-level operations For instance, QHttp offers setHost and get QFtp provides you with connectToHost, login, get, and put When using the classes, you can listen to the done signal and then react to the Boolean argument If it is true, an error has occurred; otherwise, all is well If an error has occurred, you get a text to present to your users from errorString.

namespace Programming_CSharp { public class Customer { public string FirstName { get; set; } public string LastName { get; set; } public string EmailAddress { get; set; } } public class Tester { private static XDocument CreateCustomerListXml() { List<Customer> customers = CreateCustomerList(); var customerXml = new XDocument(new XElement("Customers", from customer in customers select new XElement("Customer", new XAttribute("FirstName", customer.FirstName), new XAttribute("LastName", customer.LastName), new XElement("EmailAddress", customer.EmailAddress) ))); } return customerXml;

The extended price information includes the bid and ask prices. These are, respectively, the current price that is being bid on the stock by prospective buyers and the one that is being asked for by sellers. When you make a purchase at the current market price, it will usually be between these two values, provided you are buying a large amount of shares in the stock. It also provides the opening price for the day, as well as the year s high and low. As you can see in Figure 11-7, Microsoft stock was quoted at 26.93, but pressure is moving it downward (the ask price and the bid price are both lower than this); however, it is up on its opening price of 26.80. Now let s take a look at the code that implements this. Figure 11-8 shows the ASP .NET web form that contains the server-side controls used to implement this functionality.

private static List<Customer> CreateCustomerList() { List<Customer> customers = new List<Customer> { new Customer {FirstName = "Douglas", LastName = "Adams", EmailAddress = "dAdams@foo.com"}, new Customer {FirstName = "Richard", LastName = "Dawkins", EmailAddress = "rDawkins@foo.com"}, new Customer {FirstName = "Kenji", LastName = "Yoshino", EmailAddress = "kYoshino@foo.com"}, new Customer {FirstName = "Ian", LastName = "McEwan", EmailAddress = "iMcEwan@foo.com"}, new Customer {FirstName = "Neal", LastName = "Stephenson", EmailAddress = "nStephenson@foo.com"}, new Customer {FirstName = "Randy",

}