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break; } else if(stringCompare(answer, "Q", true) == 0) { break; } else if(stringCompare(answer, "M", true) == 0) { ConsoleWriteLine("Searching for another link"); } } else { ConsoleWriteLine("No link found"); break; } } while(linkLength > 0);
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PART II
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// Close the response 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); } ConsoleWriteLine("Terminating MiniCrawler"); } }
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Here is a short a sample session that begins crawling at McGraw-Hillcom (Remember, the precise output will vary over time as content changes)
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Linking to http://mcgraw-hillcom Link found: http://stimcgraw-hillcom:9000/cgi-bin/query mss=search&pg=aq Link, More, Quit M Searching for another link Link found: http://investormcgraw-hillcom/phoenixzhtml c=96562&p=irol-irhome Link, More, Quit L Linking to http://investormcgraw-hillcom/phoenixzhtml c=96562&p=irol-irhome Link found: http://wwwmcgraw-hillcom/indexhtml Link, More, Quit L Linking to http://wwwmcgraw-hillcom/indexhtml Link found: http://stimcgraw-hillcom:9000/cgi-bin/query mss=search&pg=aq Link, More, Quit Q Terminating MiniCrawler
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Let s take a close look at how MiniCrawler works The URI at which MiniCrawler begins is specified on the command line In Main( ), this URI is stored in the string called uristr A request is created to this URI and then uristr is set to null, which indicates that this URI has already been used Next, the request is sent and the response is obtained The
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Part II:
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content is then read by wrapping the stream returned by GetResponseStream( ) inside a StreamReader and then calling ReadToEnd( ), which returns the entire contents of the stream as a string Using the content, the program then searches for a link It does this by calling FindLink( ), which is a static method also defined by MiniCrawler FindLink( ) is called with the content string and the starting location at which to begin searching The parameters that receive these values are htmlstr and startloc, respectively Notice that startloc is a ref parameter FindLink( ) first creates a lowercase copy of the content string and then looks for a substring that matches href="http, which indicates a link If a match is found, the URI is copied to uri, and the value of startloc is updated to the end of the link Because startloc is a ref parameter, this causes its corresponding argument to be updated in Main( ), enabling the next search to begin where the previous one left off Finally, uri is returned Since uri was initialized to null, if no match is found, a null reference is returned, which indicates failure Back in Main( ), if the link returned by FindLink( ) is not null, the link is displayed, and the user is asked what to do The user can go to that link by pressing L, search the existing content for another link by pressing M, or quit the program by pressing Q If the user presses L, the link is followed and the content of the link is obtained The new content is then searched for a link This process continues until all potential links are exhausted You might find it interesting to increase the power of MiniCrawler For example, you might try adding the ability follow relative links (This is not hard to do) You might try completely automating the crawler by having it go to each link that it finds without user interaction That is, starting at an initial page, have it go to the first link it finds Then, in the new page, have it go to the first link and so on Once a dead-end is reached, have it backtrack one level, find the next link, and then resume linking To accomplish this scheme, you will need to use a stack to hold the URIs and the current location of the search within a URI One way to do this is to use a Stack collection As an extra challenge, try creating treelike output that displays the links
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