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Networking Through the Internet Using SystemNet
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CookieContainer provides various fields, properties, and methods that let you store cookies By default, this property is null To use cookies, you must set it equal to an instance of the CookieContainer class For many applications, you won t need to work with the CookieContainer property directly Instead, you will use the CookieCollection obtained from the response CookieContainer simply provides the underlying storage mechanism for the cookies The following program displays the names and values of the cookies associated with the URI specified on the command line Remember, not all websites use cookies, so you might have to try a few until you find one that does
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/* Examine Cookies
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PART II
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To see what cookies a website uses, specify its name on the command line For example, if you call this program CookieDemo, then CookieDemo http://msncom displays the cookies associated with msncom */ using System; using SystemNet; class CookieDemo { static void Main(string[] args) { if(argsLength != 1) { ConsoleWriteLine("Usage: CookieDemo <uri>"); return ; } // Create a WebRequest to the specified URI HttpWebRequest req = (HttpWebRequest) WebRequestCreate(args[0]); // Get an empty cookie container reqCookieContainer = new CookieContainer(); // Send the request and return the response HttpWebResponse resp = (HttpWebResponse) reqGetResponse(); // Display the cookies ConsoleWriteLine("Number of cookies: " + respCookiesCount); ConsoleWriteLine("{0,-20}{1}", "Name", "Value"); for(int i=0; i < respCookiesCount; i++) ConsoleWriteLine("{0, -20}{1}", respCookies[i]Name, respCookies[i]Value);
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Part II:
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Exploring the C# Library
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// Close the Response respClose(); } }
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Using the LastModified Property
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Sometimes you will want to know when a resource was last updated This is easy to find out when using HttpWebResponse because it defines the LastModified property It is shown here: public DateTime LastModi ed { get; } LastModified obtains the time that the content of the resource was last modified The following program displays the time and date at which the URI entered on the command-line site was last updated:
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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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Networking Through the Internet Using SystemNet
MiniCrawler: A Case Study
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;
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