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you ll see how you can have two machines communicate through the Transmission Control Protocol (TCP) using the System.Net.Sockets.TcpClient class. The Sys tem.Net.Sockets namespace also contains the UdpClient class (for working with the User Datagram Protocol, or UDP) and the Socket class (for working directly with socket services). I won t cover these classes here, but you can find several examples in the MSDN documentation. You can have two applications on the same or different machines communicate through TCP. This protocol ensures that data is either correctly received or an excep tion is thrown, and for this reason it is the preferred protocol when you can t afford to lose data. You can apply these techniques to programs running on the same LAN or the same machine as a simple alternative to other communication techniques, such as remoting. The TCP protocol assumes you have a server application that listens to requests com ing from clients. Writing the client application is simpler, so I ll begin there. The client code must instantiate a TcpClient object that references the server application by means of the server application s URL and port number. (The port number should be in the range of 1024 to 65535.) Next, the client invokes the TcpClient.GetStream method to retrieve the NetworkStream object that can be used to send and receive data from the server. It s obvious that the client and the server application must agree on the port number as well as the format of the data being sent over the wire. In the following example, I ll use the simple rule that the client sends and receives a string terminated with a CR-LF character so that I can perform the actual write and read operations by means of the StreamWriter and StreamReader objects:

Dim tcpCli As New TcpClient( localhost", 2048)

Dim sw As New StreamWriter(ns)

4

sw.WriteLine(txtSendData.Text)

The font can be loaded in the LoadContent method:

sw.Flush() This is VERY important!

Dim sr As New StreamReader(ns)

Dim result As String = sr.ReadLine()

Console.WriteLine(result)

7. Select Books are our business, make it bold, and then right-align it. 8. In the middle section of the page, select Lucerne Publishing, increase its size to 16

sr.Close()

protected override void LoadContent() { // Create a new SpriteBatch, which can be used to draw textures. spriteBatch = new SpriteBatch(GraphicsDevice); font = Content.Load<SpriteFont>("SpriteFont1"); }

sw.Close()

ns.Close()

The server application must create a TcpListener object that listens to a given port and accepts incoming requests from clients. The AcceptTcpClient method waits until a con nection is made and returns the TcpClient object that represents the client making the

Part VII:

points, and then change its color to purple (Followed Hyperlink).

At this point, you might be experiencing d j vu or at least think you ve seen this code before. The pattern is the same as when you loaded your images, and even the name of the method is the same. However, this time you re using the generic Load method to fetch a SpriteFont rather than a Texture2D element. There is some strong programming magic at work here, but fortunately you don t need to worry about this at the moment; all you need to know is that the Load method gets whatever type it is asked to fetch. Later, you ll create some games that contain textures, fonts, and sounds, and for each type, the Load method behaves in an appropriate manner.

request. The GetStream method of this TcpClient object returns a NetworkStream that the server application can use to read data from clients and send them a result.

Dim listening As Boolean = False Sub ListenToClients() Listen to port 2048. Dim localhostAddress As IPAddress = IPAddress.Loopback Dim tcpList As New TcpListener(localhostAddress, 2048) tcpList.Start() listening = True Do Wait for the next client to make a request. Dim tcpCli As TcpClient = tcpList.AcceptTcpClient() Read data sent by the client (a CR-LF separated string in this case). Dim ns As NetworkStream = tcpCli.GetStream Dim sr As New StreamReader(ns) Dim receivedData As String = sr.ReadLine() Process the data (just convert to upper case in this demo).

A better way to anticipate the effect of inheritance is to pretend that all the nonover ridden routines in the base class have been pasted inside the derived class. So if they reference another property or method, they call the version of the member that s defined in the derived class not the original one defined in the base class. However, sometimes you want a piece of code in the base class to use the nonoverrid den version of the properties and methods it references. Let s use another example to clarify this concept. Let s say that a person can vote only if he or she is 18 years old, so the Person3 class contains this code:

Class Person3 Public BirthDate As Date Age is defined as the number of whole years passed from BirthDate. Overridable ReadOnly Property Age() As Integer Get

Zoom level to 100%. Then click to the left of Lucerne, and press G+F to insert a line break. Select all the text in the text box, increase the font size to 12 points, and make the text bold. Finally, change the Zoom level to Whole Page. to 14 points. Then click a blank area of the page to see the results.