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So a UDP client has to choose a schedule on which it will send duplicate requests if it waits a reasonable period of time without getting a response. Of course, it might wind up wasting the server s time by doing this, because the first reply might be about to arrive and the second copy of the request might cause the server to perform needless duplicate work. But at some point the client must decide to re-send, or it risks waiting forever. So rather than letting the operating system leave it forever paused in the recv() call, this client first does a settimeout() on the socket. This informs the system that the client is unwilling to stay stuck waiting inside a socket operation for more than delay seconds, and wants the call interrupted with a socket.timeout exception once a call has waited for that long. A call that waits for a network operation to complete, by the way, is said to block the caller, and the term blocking is used to describe a call like recv() that can make the client wait until new data arrives. When we get to 6 and discuss server architecture, the distinction between blocking and non-blocking network calls will loom very large! This particular client starts with a modest tenth-of-a-second wait. For my home network, where ping times are usually a few dozen milliseconds, this will rarely cause the client to send a duplicate request simply because the reply is delayed in getting back.

display or summary for the user to click into, pulling message parts and attachments down from the server on demand. The client can also set flags on each message some of which are also meaningful to the server and can delete messages by setting the \Delete flag and then performing an expunge operation. Finally, IMAP offers sophisticated search functionality, again so that common user operations can be supported without requiring the e-mail data to be downloaded to the local machine.

The output of this code is the following: Field : Field : Method: Method: Method: Method: Method: Method: Field1 Field2 Method1 Method2 GetType ToString Equals GetHashCode

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With consumer video recording technology reaching millions, more and users are sharing, categorizing, and commenting on videos uploaded to online services, just like they do with photos. Google s YouTube YouTube is a vast repository of videos about every imaginable topic. You can use YouTube s API to integrate online videos into your web site: Available at: http://www.youtube.com/dev Yahoo Video Search The Video Search service allows you to search the Internet for video clips: Available at: http://developer.yahoo.com/search/video/V1/videoSearch.html API used: REST Data format: XML

If you have never read it, then you should brew some of your favorite coffee, sit down, and treat yourself to reading Neal Stephenson's essay In the Beginning Was the Command Line. You can download a copy from his web site, in the form appropriately enough of a raw text file: http://www.cryptonomicon.com/beginning.html. The command line is the topic of this chapter: how you can access it over the network, together with enough discussion about its typical behavior to get you through any frustrations you might encounter while trying to use it. Happily enough, this old-fashioned idea of sending simple textual commands to another computer will, for many readers, be one of the most relevant topics of this book. The main network protocol that we will discuss SSH, the Secure Shell seems to be used everywhere to configure and maintain machines of all kinds. When you get a new account at a web hosting company like WebFaction and have used their fancy control panel to set up your domain names and list of web applications, the command line is then your primary means of actually installing and running the code behind your web sites. Virtual or physical servers from companies like Linode, Slicehost, and Rackspace are almost always administered through SSH connections. If you build a cloud of dynamically allocated servers using an API-based virtual hosting service like Amazon AWS, you will find that Amazon gives you access to your new host by asking you for an SSH key and installing it so that you can log in to your new instance immediately and without a password.

The typeof operator is also called by the GetType method, which is available for every object of every type. For example, the following code retrieves the name of the type of the object: class SomeClass { ... } class Program { static void Main() { SomeClass s = new SomeClass(); Console.WriteLine("Type s: {0}", s.GetType().Name); } } This code produces the following output:

It is as if, once early computers became able to receive text commands and return text output in response, they reached a kind of pinnacle of usefulness that has never yet been improved upon. Language is the most powerful means humans have for expressing and building meaning, and no amount of pointing, clicking, or dragging with a mouse has ever expressed even a fraction of the nuance that can be communicated when we type even in the cramped and exacting language of the Unix shell.

What are Statements Expression Statements Flow-of-Control Statements The if Statement The if...else Statement The switch Statement The while Loop The do Loop The for Loop Jump Statements The break Statement The continue Statement Labeled Statements The goto Statement The using Statement Other Statements

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