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The System.Net.Sockets namespace defines the Socket class, which makes the socket features of the underlying operating system available from .NET. We use a Socket when we want to open a TCP connection to a remote service:

Socket daytimeSocket = new Socket( serverIp.AddressFamily, SocketType.Stream, ProtocolType.Tcp);

Socket implements IDisposable, so you will need to call Dispose at some point. And while we would normally write a using statement to handle that, that s somewhat unusual with sockets, because they often have a longer lifetime than any particular method. There isn t one right way to handle this, because the right moment to dispose a socket will depend on the way in which your application uses the socket. The next few examples therefore don t show disposal, because we are illustrating aspects of the API that will be the same no matter how you are using sockets. But be aware that you will always need to find a suitable place to call Dispose.

The Socket constructor needs three pieces of information. It needs to know the address family we will use to identify the server (e.g., IPv4 or IPv6). It also needs to know what style of communication we re expecting we re asking for stream-like communication. (Some protocols support some other styles of communication, but with TCP you always specify Stream here.) Finally, we specify the specific protocol we d like to use TCP in this case.

Value assigned 11--explicitly set 12--one more than the previous one 13--one more than the previous one 14--one more than the previous one 4--explicitly set 5--one more than the previous one 14--Ace is defined above

If this constructor seems more complex than necessary, it s because sockets aren t just for TCP/IP. The underlying Windows socket API (WinSock) was introduced before TCP/IP had become the dominant protocol, so it supports numerous protocols. Windows even supports custom providers that add socket support for new protocols.

Note that we don t specify where we re connecting to yet. That information doesn t go in the constructor because not all sockets work the same way some protocols support transmission patterns other than simple point-to-point connections. So the Socket class requires that we first say what sort of socket we want before going on to say what we re trying to communicate with. We supply that information when we connect to the service:

if (this._currentCssClass) { Sys.UI.DomElement.addCssClass(this._element, this._currentCssClass); } }, get_hoverCssClass : function() { return this._hoverCssClass; }, set_hoverCssClass : function(value) { this._hoverCssClass = value; }, get_focusCssClass : function() { return this._focusCssClass; }, set_focusCssClass : function(value) { this._focusCssClass = value; } } Samples.FormattingBehavior.registerClass( 'Samples.FormattingBehavior', Sys.UI.Behavior);

daytimeSocket.Connect(serverIp, 13);

Remember, port 13 is the port number allocated by IANA for the daytime service. We re going to retrieve the time of day as text from this service, so we declare a variable to hold the result:

Programmers have long used the different bits in a single word as a compact way to represent a set of on/off flags for options. Enums offer a convenient way to implement this. The general steps are the following: 1. Determine how many bit flags you need, and choose an unsigned integral type with enough bits to hold them. 2. Determine what each bit represents, and declare an enum of the chosen integral type, with members representing each bit. 3. Use the bitwise OR operator to set the appropriate bits in a word holding the bit flags. 4. Unpack the bit flags by using the bitwise AND operator. For example, the following code shows the enum declaration representing the options for a card deck in a card game. The underlying type, uint, is more than sufficient to hold the four bit flags needed. Notice the following about the code: The members have names that represent the options and are set to the value representing the value of a particular bit. Decorating the enum with the Flags attribute is not actually necessary, but gives some additional convenience, which I will discuss shortly. [Flags] enum CardDeckSettings : uint { SingleDeck = 0x01, LargePictures = 0x02, FancyNumbers = 0x04, Animation = 0x08 }

string data;

Sockets represent all data as bytes. (Or more precisely, octets, which are 8-bit bytes. Back in the old days, some computers used other byte sizes, and you occasionally come across evidence of this for example, some parts of the Internet email system guarantee to transfer 8-bit bytes, and may truncate your data to seven bits per byte.) The Daytime Protocol specification says that the service will return text using the ASCII encoding, so we need something that can convert a stream of bytes containing ASCII into a .NET string. Example 13-23 does this.

using (Stream timeServiceStream = new NetworkStream(daytimeSocket, true)) using (StreamReader timeServiceReader = new StreamReader(timeServiceStream, Encoding.ASCII)) { data = timeServiceReader.ReadToEnd(); }

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