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Note Hexadecimal representation is often used when working with bits because there is a more direct correlation between the hex representation of a number and its bit pattern than with the decimal representation.

The next number indicates that the server is deliberately advancing times by 9125 ms to compensate for transmission delays in the Internet That s all you need to do to use a service with sockets construct a suitably configured socket, call Connect, and then read data If the service you re using expects to be sent data, you can also write data into the NetworkStream Obviously, you need to be prepared for errors the Connect method will throw an exception if it is unable to connect to the service, and you should also be prepared to get errors anytime you try to read or write data with a socket; even if you connect successfully, parts of the network may later fail, severing the connection to the service Again, NET indicates this by throwing exceptions.

We ve looked at only half of the story so far what if you wanted to write a program that implements a service like the daytime service You can do this with the Socket class too, but it s a little more involved..

To implement a TCP-based service, we need to make sure our program is ready to receive requests when they come in. If a computer receives an incoming TCP connection request for some port number and no programs are currently listening for connections on that port number, it will simply reject the request. So the first thing we need to do is create a socket that listens for incoming connections (see Example 13-25).

Both the $addHandlers and $clearHandlers shortcuts were discussed in section 23 Next, you find the event handlers D, which you use to set the state of the element based on the event that it raised Each event handler calls the _setCssClass method, which takes care of switching the element s CSS class based on the event raised Finally, a relevant portion of the code is used to declare the client properties E, which are needed if you want to take advantage of the $create method to configure a new instance of the client behavior Let s take time to copy the code for the client behavior to a JavaScript file and then reference it in an ASPNET page through the ScriptManager control This should be the easiest part if you read the previous chapters of the book Listing 8.

using (Socket daytimeListener = new Socket( AddressFamily.InterNetworkV6, SocketType.Stream, ProtocolType.Tcp)) {

To create a word with the appropriate bit flags, declare a variable of the enum type, and use the bitwise OR operator to set the required bits. For example, the following code sets three of the four options: Enum type Flag word Bit flags ORed together CardDeckSettings ops = CardDeckSettings.SingleDeck | CardDeckSettings.FancyNumbers | CardDeckSettings.Animation ; To determine whether a particular bit is set, use the bitwise AND operator with the flag word and the bit flag. For example, the following code checks to see whether the SingleDeck bit flag is set. The AND operation is performed, and the result is compared to the value of the SingleDeck bit flag. UseSingleDeck = (ops & CardDeckSettings.SingleDeck) == CardDeckSettings.SingleDeck; Flag word Bit flag

daytimeListener.SetSocketOption( SocketOptionLevel.IPv6, (SocketOptionName) 27, 0); IPEndPoint daytimeEndpoint = new IPEndPoint(IPAddress.IPv6Any, 13); daytimeListener.Bind(daytimeEndpoint); daytimeListener.Listen(20); ...

As with the client side, we create a Socket object, once again specifying the address family, socket type, and protocol. (In this particular example, the lifetime we require for the Socket happens to be the same as the lifetime of our Main method, so a using statement is an appropriate way to manage the socket s disposal.) Whereas with the client we could just use whichever IP address type came back from Dns.GetHostEntry, when we write a server we need to state which sort of address we want to listen on. Example 13-25 chooses the InterNetworkV6 family to enable the use of IPv6. If you want to support just IPv4 you can specify InterNetwork. In fact, this example supports both kinds of address the call to SetSocketOption after the constructor puts this socket into dual mode, meaning that it s able to accept connections through either IPv4 or IPv6. (The magic number 27 that appears in the call corresponds to a value defined by the Windows SDK that doesn t currently have an equivalent entry in the SocketOption Name enumeration. So unfortunately, this is just a magic incantation that you need to know in order to enable a socket to accept incoming connections on either IP version.)

Dual-mode sockets are supported only on Windows Vista or later versions of Windows. If you want to accept incoming connections on both IPv4 and IPv6 on earlier versions of Windows, you ll need to create two sockets and listen for connections on both.

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