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/* Use LastModified To see the date on which a website was last modified, enter its URI on the command line For example, if you call this program LastModifiedDemo, then to see the date of last modification for HerbSchildtcom enter LastModifiedDemo http://wwwHerbSchildtcom */ using System; using SystemNet; class LastModifiedDemo { static void Main(string[] args) { if(argsLength != 1) { ConsoleWriteLine("Usage: LastModifiedDemo <uri>"); return ; } HttpWebRequest req = (HttpWebRequest) WebRequestCreate(args[0]); HttpWebResponse resp = (HttpWebResponse) reqGetResponse(); ConsoleWriteLine("Last modified: " + respLastModified); respClose(); } }

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729 5

To show how easy WebRequest and WebReponse make Internet programming, a skeletal web crawler called MiniCrawler will be developed A web crawler is a program that moves from link to link to link Search engines use web crawlers to catalog content MiniCrawler is, of course, far less sophisticated than those used by search engines It starts at the URI that you specify and then reads the content at that address, looking for a link If a link is found, it then asks if you want to go to that link, search for another link on the existing page, or quit Although this scheme is quite simple, it does provide an interesting example of accessing the Internet using C# MiniCrawler has several limitations First, only absolute links that are specified using the href= http hypertext command are found Relative links are not used Second, there is no way to go back to an earlier link Third, it displays only the links and no surrounding content Despite these limitations, the skeleton is fully functional, and you will have no trouble enhancing MiniCrawler to perform other tasks In fact, adding features to MiniCrawler is a good way to learn more about the networking classes and networking in general Here is the entire code for MiniCrawler:

/* MiniCrawler: A skeletal Web crawler Usage: To start crawling, specify a starting URI on the command line For example, to start at McGraw-Hillcom use this command line: MiniCrawler http://McGraw-Hillcom */ using System; using SystemNet; using SystemIO; class MiniCrawler { // Find a link in a content string static string FindLink(string htmlstr, ref int startloc) { int i; int start, end; string uri = null; i = htmlstrIndexOf("href=\"http", startloc, StringComparisonOrdinalIgnoreCase); if(i != -1) { start = htmlstrIndexOf('"', i) + 1;

Part II:

end = htmlstrIndexOf('"', start); uri = htmlstrSubstring(start, end-start); startloc = end; } return uri; } static void Main(string[] args) { string link = null; string str; string answer; int curloc; // holds current location in response if(argsLength != 1) { ConsoleWriteLine("Usage: MiniCrawler <uri>"); return ; } string uristr = args[0]; // holds current URI HttpWebResponse resp = null; try { do { ConsoleWriteLine("Linking to " + uristr); // Create a WebRequest to the specified URI HttpWebRequest req = (HttpWebRequest) WebRequestCreate(uristr); uristr = null; // disallow further use of this URI // Send that request and return the response resp = (HttpWebResponse) reqGetResponse(); // From the response, obtain an input stream Stream istrm = respGetResponseStream(); // Wrap the input stream in a StreamReader StreamReader rdr = new StreamReader(istrm); // Read in the entire page str = rdrReadToEnd(); curloc = 0; do { // Find the next URI to link to link = FindLink(str, ref curloc); if(link != null) { ConsoleWriteLine("Link found: " + link);

The reasoning we have used in the last example shows this: If the curve x = g(y), c y d, is rotated about the y-axis then the volume enclosed by the resulting surface is

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ConsoleWrite("Link, More, Quit "); answer = ConsoleReadLine(); if(stringEquals(answer, "L", StringComparisonOrdinalIgnoreCase)) { uristr = stringCopy(link); break; } else if(stringEquals(answer, "Q", StringComparisonOrdinalIgnoreCase)) { break; } else if(stringEquals(answer, "M", StringComparisonOrdinalIgnoreCase)) { ConsoleWriteLine("Searching for another link"); } } else { ConsoleWriteLine("No link found"); break; } } while(linkLength > 0); // Close the Response if(resp != null) respClose(); } while(uristr != null); } catch(WebException exc) { ConsoleWriteLine("Network Error: " + excMessage + "\nStatus code: " + excStatus); } catch(ProtocolViolationException exc) { ConsoleWriteLine("Protocol Error: " + excMessage); } catch(UriFormatException exc) { ConsoleWriteLine("URI Format Error: " + excMessage); } catch(NotSupportedException exc) { ConsoleWriteLine("Unknown Protocol: " + excMessage); } catch(IOException exc) { ConsoleWriteLine("I/O Error: " + excMessage); } finally { if(resp != null) respClose(); } ConsoleWriteLine("Terminating MiniCrawler"); } }