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<system.serviceModel> <bindings> <wsHttpBinding> <binding name="WSHttpBinding_IAddressService" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" bypassProxyOnLocal="false" transactionFlow="false" hostNameComparisonMode="StrongWildcard" maxBufferPoolSize="524288" maxReceivedMessageSize="65536" messageEncoding="Text" textEncoding="utf-8" useDefaultWebProxy="true" allowCookies="false"> <readerQuotas maxDepth="32" maxStringContentLength="65536" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384" /> <reliableSession ordered="true" inactivityTimeout="00:10:00" enabled="false" /> <security mode="Message"> <transport clientCredentialType="Windows" proxyCredentialType="None" realm="" /> <message clientCredentialType="Windows" negotiateServiceCredential="true" algorithmSuite="Default" establishSecurityContext="true" /> </security> </binding> </wsHttpBinding> </bindings> <client> <endpoint address="http://localhost:49906/FirstWCF/Service.svc" binding="wsHttpBinding" bindingConfiguration="WSHttpBinding_IAddressService" contract="IAddressService" name="WSHttpBinding_IAddressService"> <identity> <userPrincipalName value="BookDev\Laurence" /> </identity> </endpoint> </client> </system.serviceModel>

public override bool Read() { intColumnIndex = -1; strValue = ""; return reader.Read(); }

This code flags that the URL has been visited:

This configures the service model on the client to talk to the server using the contract specified by the server via the generated proxy (AddressServiceIIS).

crawler.run(); } this.links.remove(url); }

The Read() method allows you to iterate through the table. It calls the Read() method of the OleDbDataReader class and returns a Boolean value indicating whether the read operation was successful. As the record pointer is moving on to a new record, the current column index and value are reset.

Add a DataGrid control to your ASPX page and use the Auto Format feature to style it in the Colorful style. You ll end up with markup that looks like this:

This private method adds a crawler to a set of crawlers that are children of this crawler so that they can all by stopped when this one is stopped:

private void addListener(Crawler crawler) { stopListeners.add(crawler); }

public override bool HasValue { get { return reader.IsDBNull(intColumnIndex); } } The HasValue property indicates whether the TableReader contains any value. If the column contains a NULL value, HasValue should return false. The IsDbNull() method of the OleDbDataReader class accepts a column index and returns true if the column contains a NULL value.

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>Untitled Page</title> </head> <body> <form id="form1" runat="server"> <div> <asp:GridView ID="GridView1" runat="server" CellPadding="4" ForeColor="#333333" GridLines="None"> <FooterStyle BackColor="#990000" Font-Bold="True" ForeColor="White" /> <RowStyle BackColor="#FFFBD6" ForeColor="#333333" /> <SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" /> <PagerStyle BackColor="#FFCC66" ForeColor="#333333" HorizontalAlign="Center" /> <HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="White" /> <AlternatingRowStyle BackColor="White" /> </asp:GridView> </div> </form> </body> </html>

3

public override bool ReadAttributeValue() { if (intColumnIndex < reader.FieldCount) { strValue = reader.GetValue(intColumnIndex).ToString(); return true; } else { return false; } } The ReadAttributeValue() method returns the value of the current column. It does so by using the GetValue() method of the OleDbDataReader class as before.

Next, you ll add code into the Page_Load event handler to call the WCF service and fill in the grid with the results of the call. This is done with code like this:

This private method stops all the crawlers that are children of this crawler:

private void notifyStopCrawlers() { Iterator i = stopListeners.iterator(); while(i.hasNext() && depth > 0) { Crawler crawler = (Crawler)i.next(); crawler.setStopped(true); } }

public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { AddressServiceClient myAddressService = new AddressServiceClient(); string strData = myAddressService.GetAddresses("6105"); XmlDocument xmlDoc = new XmlDocument(); xmlDoc.LoadXml(strData); XmlNodeReader nRead = new XmlNodeReader(xmlDoc); DataSet d = new DataSet();

public string Name { get { if (intColumnIndex == -1) { return cmd.CommandText; } else { return reader.GetName(intColumnIndex); } } } The Name property returns either the underlying table name or column name. This is useful to see which column is being read. The table name is obtained from the CommandText property of the OleDbCommand class, whereas the column name is obtained from the GetName() method of the OleDbDataReader class.

This method allows the owner of the crawler to test to see if the crawler is currently running:

d.ReadXml(nRead); nRead.Close(); GridView1.DataSource = d; GridView1.DataBind(); } }

public override string Value { get { return strValue; } } Finally, the Value property simply returns the value stored in the strValue variable. Note that strValue gets assigned in the ReadAttributeValue() method. The remaining properties and methods are not implemented by the TableReader class. Compile the class library and you should get an assembly, TableReader.dll. This assembly can be used in client applications to work with OLEDB databases and XML.

public boolean isStopped() { return stopped; }