.NET/ASP.NET/C#/VB.NET PDF Document SDK

This generates the whole of the XML document in a single statement. So the work that took 25 lines of code in Example 12-1 comes down to just seven. Example 12-6 shows the whole example, with its much simplified Main method.

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Use a for loop to add the red, green, and blue values for each pixel to the stream. You use the pixel method to get the QRgb value for each pixel of the QImage. You then use the qRed, qGreen, and qBlue functions to get the individual red, green, and blue parts of the QRgb value. When the values for all the pixels of the given line have been added to the stream, you re ready to broadcast the entire QByteArray buffer using the QUdpSocket object. You do this with the writeDatagram method, which tries to send the entire given byte array as a datagram to the given address and port. The code shown in Listing 14-33 uses QHostAddress::Broadcast as host address and port 9988, so the data will be sent to port 9988 on all clients in the same subnet as the server. Listing 14-33. Broadcasting a single line void Sender::broadcastLine() { QByteArray buffer( 6+3*image->width(), 0 ); QDataStream stream( &buffer, QIODevice::WriteOnly ); stream.setVersion( QDataStream::Qt_4_0 ); stream << (quint16)image->width() << (quint16)image->height(); quint16 y = qrand() % image->height(); stream << y; for( int x=0; x<image->width(); ++x ) { QRgb rgb = image->pixel( x, y );

This will present a dialog box in which you specify the WSDL of the service you are referencing (see Figure 11-4). When you enter a valid WSDL here, the description pane will update with the supported functions on the web service, as well as the services that are available to this WSDL (multiple services can be published to a single WSDL). In the Web Reference Name field, you should enter a friendly name, because this is the name that will be generated for the proxy that talks to the web service on your behalf. The Company Information web service is used in the application to present the name of the company as well as the current price information (see Figure 11-5). Additionally, when the button to the right of the current price is clicked, some extended stock price information appears. This demonstrates a partial update of the page. When running it, you will see that this segment updates without incurring a full-page refresh and associated blink. It also provides a status that the application is loading while the asynchronous update is taking place (see Figure 11-6).

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

namespace Programming_CSharp { // Simple customer class public class Customer { // Same as in Example 12-1 } // Main program public class Tester { static void Main() { 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) ))); Console.WriteLine(customerXml.ToString()); Console.Read();

}

stream << (quint8)qRed( rgb ) << (quint8)qGreen( rgb ) << (quint8)qBlue( rgb ); } socket->writeDatagram( buffer, QHostAddress::Broadcast, 9988 ); } The Sender class is used from the main function shown in Listing 14-34. The Sender object is created and then a dialog box is shown using QMessageBox::information. While the dialog is open, the QTimer in the Sender object triggers broadcasts. As soon as the user closes the dialog, the main function ends, the Sender object is destroyed along with the QTimer, and the broadcasting stops. This provides a good way to create a server that is easy to turn off. Listing 14-34. The main function of the broadcaster int main( int argc, char **argv ) { QApplication app( argc, argv ); Sender sender; QMessageBox::information( 0, "Info", "Broadcasting image" ); return 0; }

// Create a customer list with sample data private static List<Customer> CreateCustomerList() { List<Customer> customers = new List<Customer> { new Customer { FirstName = "Orlando", LastName = "Gee",

}

}