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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.

Before concluding this chapter, a brief discussion of WebClient is warranted As mentioned near the start of this chapter, if your application only needs to upload or download data to or from the Internet, then you can use WebClient instead of WebRequest and WebResponse The advantage to WebClient is that it handles many of the details for you WebClient defines one constructor, shown here: public WebClient( ) WebClient defines the properties shown in Table 25-6 WebClient defines a large number of methods that support both synchronous and asynchronous communication Because asynchronous communication is beyond the scope of this chapter, only those methods that support synchronous requests are shown in Table 25-7 All methods throw a WebException if an error occurs during transmission The following program demonstrates how to use WebClient to download data into a file:

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It should be noted that n refers to the part of the motion that we specify and n* refers to the motion in the remaining part The integration of n and n* gives the cam rotation f Therefore, the area under the -2dh/dq vs q gives the sum of the motion of the cam in both halves of the cycle Thus, using Eq (817), we can predict and control the motion in the second half of the cycle Denoting the distance between the cam and the roller-crank pivots by d, and the length of the roller crank as a, applying the cosine rule to the triangle A0B0A in Fig 818, h can be written as h = cos -1 where x = a 2 + d 2 - 2 ad cosq Differentiating h in Eq (818) with respect to q, we get sin q (1 - (d a) cosq ) dh -1 = dq sin h (1 + (d a) 2 - 2(d a) cosq ) 3 2 (819) d 2 + x 2 - a2 2 dx (818)

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// Use WebClient to download information into a file using System; using SystemNet; using SystemIO;

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The above expression is useful in specifying the desired motion as well as in generating the cam pro le Although the transmission angle is a useful measure to quantify the performance of a given mechanism, it is not always the most convenient measure to use while designing a

class WebClientDemo { static void Main() { WebClient user = new WebClient(); string uri = "http://wwwMcGraw-Hillcom"; string fname = "datatxt"; try { ConsoleWriteLine("Downloading data from " + uri + " to " + fname); userDownloadFile(uri, fname); } catch (WebException exc) { ConsoleWriteLine(exc); } ConsoleWriteLine("Download complete"); } }

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