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The following private method crawls a link that is on a host other than the one currently being processed. The simplest way to effect this is to instantiate a new crawler specifying the appropriate URL, but to pass it the information on visited and forbidden hosts so that already crawled links can be ignored. Note that we reduce the permitted depth by 1 for this next crawler so that it can t creep too far away from the original link. Eventually we ll reach 0, and there s no point in instantiating the crawler because it would simply complete immediately.

Microsoft (R) Service Model Metadata Tool [Microsoft (R) Windows (R) Communication Foundation, Version 3.0.4506.30] Copyright (c) Microsoft Corporation. All rights reserved. Attempting to download metadata from 'http://localhost:49906/FirstWCF/Service.svc wsdl' using WS-Metadata Exchange or DISCO. Generating files... C:\Program Files\Microsoft Visual Studio 8\VC\AddressService.cs C:\Program Files\Microsoft Visual Studio 8\VC\output.config

public override string GetAttribute(int i) { return reader.GetValue(i).ToString(); } public override string GetAttribute(string name) { return reader.GetValue(reader.GetOrdinal(name)).ToString(); } The column values can be retrieved by using two overloads of the GetAttribute() method. The first overload accepts the attribute index. In our case, the attribute index is the same as the column index. The GetValue() method of the OleDbDataReader class accepts the column index and returns the column value as an object. The ToString() method returns a string representation of the object to the caller. The second overload accepts an attribute name. The GetOrdinal() method of OleDbDataReader accepts the column name and returns its index. The returned index is then passed to the GetValue() method as before.

private void crawlNewHost(URL url) { Set links = new HashSet(); links.add(url); if( depth > 1 ) {

Now let s create a new crawler to crawl the external link:

As you can see, the files are generated in the current directory. You will add them to your new client next. You can use any type of application as a service client as long as you use this configuration information. If you re building a Windows app, you add the information to your App.config; otherwise you add it to your Web.config. For this example, you ll build a web client that takes the information back from the WCF service and renders it on a DataGrid. First, create the web application that implements the client using the File New dialog. You ll have a basic web application set up containing a Default.aspx page. You ll need to add a Web.config file to the project. The easiest way to do this is to just run the application in debug mode, and Visual Studio will automatically generate a Web.config file for you. Next, you should copy the two files AddressService.cs and output.config to the directory that the new web site is implemented in, and add them to your project.

public override bool MoveToAttribute(string name) { intColumnIndex = reader.GetOrdinal(name); return true; } public override bool MoveToElement() { intColumnIndex = -1; return true; }

Crawler crawler = new Crawler(links, visited, visitedHosts, forbidden, failed, (depth - 1));

The next step is to add the settings from output.config to your Web.config file. Once you are done, Web.config will look something like this:

The new crawler should be stopped whenever this crawler is stopped:

public override bool MoveToFirstAttribute() { intColumnIndex = 0; return true; } public override bool MoveToNextAttribute() { intColumnIndex++; if (intColumnIndex > reader.FieldCount - 1) { return false; } else { return true; } } The MoveToAttribute(), MoveToFirstAttribute(), MoveToNextAtribute(), and MoveToElement() methods allow you to navigate within the available attributes: The MoveToAttribute() method accepts the name of the column (which is the same as the attribute name) and sets the column index variable to the index of that column. The MoveToFirstAttribute() method sets the current column index to 0, whereas MoveToNextAttribute() increments it so that the next column value can be read. The MoveToElement() method simply sets the current column index to -1, indicating that no column value can be read. The MoveToElement() method is intended to move the reader to the element node from any of its attributes. By setting the column index to -1, we reset the column index counter and mimic this behavior.

addListener(crawler);