barcode printing using c#.net Networking Through the Internet Using SystemNet in C#

Generate QR in C# Networking Through the Internet Using SystemNet

Networking Through the Internet Using SystemNet
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The first part of the output is shown here (Of course, over time this content will differ from that shown here)
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<html> <head> <title>Home - The McGraw-Hill Companies</title> <meta name="keywords" content="McGraw-Hill Companies,McGraw-Hill, McGraw Hill, Aviation Week, BusinessWeek, Standard and Poor s, Standard & Poor s,CTB/McGrawHill,Glencoe/McGraw-Hill,The Grow Network/McGraw-Hill,Macmillan/McGraw-Hill, McGraw-Hill Contemporary,McGraw-Hill Digital Learning,McGraw-Hill Professional Development,SRA/McGraw
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PART II
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Press Enter -Hill,Wright Group/McGraw-Hill,McGraw-Hill Higher Education,McGraw-Hill/Irwin, McGraw-Hill/Primis Custom Publishing,McGraw-Hill/Ryerson,Tata/McGraw-Hill, McGraw-Hill Interamericana,Open University Press, Healthcare Information Group, Platts, McGraw-Hill Construction, Information & Media Services" /> <meta name="description" content="The McGraw-Hill Companies Corporate Website" /> <meta http-equiv Press Enter
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This is part of the hypertext associated with the McGraw-Hillcom website Because the program simply displays the content character-by-character, it is not formatted as it would be by a browser; it is displayed in its raw form Let s examine this program line-by-line First, notice the SystemNet namespace is used As explained, this is the namespace that contains the networking classes Also notice that SystemIO is included This namespace is needed because the information from the website is read using a Stream object The program begins by creating a WebRequest object that contains the desired URI Notice that the Create( ) method, rather than a constructor, is used for this purpose Create( ) is a static member of WebRequest Even though WebRequest is an abstract class, it is still possible to call a static method of that class Create( ) returns a WebRequest object that has the proper protocol plugged in, based on the protocol prefix of the URI In this case, the protocol is HTTP Thus, Create( ) returns an HttpWebRequest object Of course, its return value must still be cast to HttpWebRequest when it is assigned to the HttpWebRequest reference called req At this point, the request has been created, but not yet sent to the specified URI To send the request, the program calls GetResponse( ) on the WebRequest object After the request has been sent, GetResponse( ) waits for a response Once a response has been received, GetResponse( ) returns a WebResponse object that encapsulates the response This object is assigned to resp Since, in this case, the response uses the HTTP protocol, the result is cast to HttpWebResponse Among other things, the response contains a stream that can be used to read data from the URI Next, an input stream is obtained by calling GetResponseStream( ) on resp This is a standard Stream object, having all of the attributes and features of any other input stream A reference to the stream is assigned to istrm Using istrm, the data at the specified URI can be read in the same way that a file is read
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Part II:
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Exploring the C# Library
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Next, the program reads the data from McGraw-Hillcom and displays it on the screen Because there is a lot of information, the display pauses every 400 characters and waits for you to press enter This way the first part of the information won t simply scroll off the screen Notice that the characters are read using ReadByte( ) Recall that this method returns the next byte from the input stream as an int, which must be cast to char It returns 1 when the end of the stream has been reached Finally, the response is closed by calling Close( ) on resp Closing the response stream automatically closes the input stream, too It is important to close the response between each request If you don t, it is possible to exhaust the network resources and prevent the next connection Before leaving this example, one other important point needs to be made: It was not actually necessary to use an HttpWebRequest or HttpWebResponse object to display the hypertext received from the server Because the preceding program did not use any HTTPspecific features, the standard methods defined by WebRequest and WebResponse were sufficient to handle this task Thus, the calls to Create( ) and GetResponse( ) could have been written like this:
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// First, create a WebRequest to a URI WebRequest req = WebRequestCreate("http://wwwMcGraw-Hillcom"); // Next, send that request and return the response WebResponse resp = reqGetResponse();
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In cases in which you don t need to employ a cast to a specific type of protocol implementation, it is better to use WebRequest and WebResponse because it allows protocols to be changed with no impact on your code However, since all of the examples in this chapter will be using HTTP, and a few will be using HTTP-specific features, the programs will use HttpWebRequest and HttpWebResponse
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