<%@ Import Namespace="System.IO" %> <%@ Assembly Name="System.xml" %> <%@ Import Namespace="System.Xml" %> <%@ page language="c#" EnablesessionState="True" %> <%-- These are the imported assembiles and namespaces need to run the counter --%> <html> <head> <title>Saurabh's XML Counter Script</title> <script language="C#" runat="server"> //script is called when the page is loaded public void Page_Load(Object src, EventArgs e) { //the path to the Xml file which will contain all the data //modify this if you have any other file or directory mappings. //modify this if you have been directed here from Step 2 of the ReadMe file. string datafile="db/xmlcounter.xml" ;
if(!Page.IsPostBack){ //try-catch block containing the counter code try { //create an instance of the class XmlDocument XmlDocument xmldocument = new XmlDocument() ;
//Open a FileStream to the specified file FileStream fin ; //It is very Important to specify the "FileShare.ReadWrite" option. //This allows other viewers to also read and write to the Database //This was missing in my last release hence there was a BUG !!! fin = new FileStream(Server.MapPath(datafile), FileMode.Open, Fileaccess.Read, FileShare.ReadWrite) ; //Load the Document xmldocument.Load(new StreamReader(fin)) ; fin.Close(); //create an instance of the DocumentNavigator class used to //navigate through and XML file DocumentNavigator navigator = new DocumentNavigator(xmldocument) ;
//Move to the first element (in my file 'Visitors') navigator.MoveToDocumentElement() ; //move to it child at position '0' (ie.in my file 'total' node) navigator.MoveToChild(0) ;
//check if we are on the right element which has an attribute if (navigator.HasAttributes) { //get the attribute of the node 'total' called 'tot' (see the xmlcounter.xml file) //since the value stored is in a string format we 'cast' it into a Int type int total = int.Parse(navigator.GetAttribute("tot")) ; //increase the counter total++ ; //show the counter on the page countmess.Text = "You are visitor No: "+total.ToString() ; //save the incremented counter back in the XML file navigator.SetAttribute(0,total.ToString() ); }
//Update the Database only if a new session is there if(Session["counter"]==null) { //move back to the Document element navigator.MoveToDocumentElement() ; navigator.MoveToChild(0) ; //then insert the element after the 'total' element which will contain all //the information of a single visitor navigator.Insert(TreePosition.After , XmlNodeType.Element, "Viewer","","") ; //make an instance to the HttpUrl class to get information of the referrer to //the page if any. if there are no referrers then by Default this object is 'null' //so we have to make a check if it is null and do the needful HttpUrl objUrl = Request.UrlReferrer; if(objUrl!=null) { navigator.Insert(TreePosition.FirstChild, XmlNodeType.Element,"Referrer","",""); navigator.Insert(TreePosition.FirstChild, XmlNodeType.Text,"Referrer","","") ; navigator.Value = objUrl.Host ; } else { navigator.Insert(TreePosition.FirstChild, XmlNodeType.Element,"Referrer","",""); navigator.Insert(TreePosition.FirstChild, XmlNodeType.Text,"Referrer","","") ; navigator.Value = "Direct" ; } //release the resource for Garbage collection objUrl=null ; //move to parent node and then insert the information about the useragent navigator.MoveToParent() ; navigator.Insert(TreePosition.After, XmlNodeType.Element,"UserAgent","","" ) ; navigator.Insert(TreePosition.FirstChild, XmlNodeType.Text,"UserAgent","","" ) ; navigator.Value = Request.UserAgent ; navigator.MoveToParent() ; navigator.Insert(TreePosition.After, XmlNodeType.Element,"UserHostAddress","","" ) ; navigator.Insert(TreePosition.FirstChild, XmlNodeType.Text,"UserHostAddress","","" ) ; navigator.Value = Request.UserHostAddress ; navigator.MoveToParent() ; navigator.Insert(TreePosition.After, XmlNodeType.Element,"UserHostName","","" ) ; navigator.Insert(TreePosition.FirstChild, XmlNodeType.Text,"UserHostName","","" ) ; navigator.Value = Request.UserHostName ; //to get more information of the users browsers capabilities make an object //of the HttpBrowserCapabilities class HttpBrowserCapabilities bc = Request.Browser;
//Make an object of the DateTime class to get the Date Time DateTime now = DateTime.Now ; navigator.MoveToParent() ; navigator.Insert(TreePosition.After, XmlNodeType.Element,"Date","","" ) ; navigator.Insert(TreePosition.FirstChild, XmlNodeType.Text,"Date","","" ) ; navigator.Value = now.ToShortDateString() ;
navigator.MoveToParent() ; navigator.Insert(TreePosition.After, XmlNodeType.Element,"Time","","" ) ; navigator.Insert(TreePosition.FirstChild, XmlNodeType.Text,"Time","","" ) ; navigator.Value = now.ToShortTimeString() ; //Create a File Stream again to Write to the Database //Again remember to specify the "FileShare.ReadWrite" FileStream fout ; fout = new FileStream(Server.MapPath(datafile), FileMode.Open, FileAccess.Write, FileShare.ReadWrite) ;
//finally save the user data to the xml database file xmldocument.Save(new StreamWriter(fout)) ; //free the resources explicitly for other classes to use fout.Close(); navigator=null ; xmldocument=null ; //Just store any value to the session Session["counter"]=1 ; }
<h3 align="center">Welcome to Saurabh's Counter Script</h3> <br> <p align="center"> This is a sample page which has the counter scripting in it. Take the script from this page and paste it on your page.
2) viewcounter.aspx : The counter information viewing page
<%@ Import Namespace="System" %> <%@ Import Namespace="System.IO" %> <%@ Import Namespace="System.Data" %> <%@ Assembly Name="System.Xml" %> <%@ Import Namespace="System.Xml" %> <%@ Page Language="C#" %> <html> <head> <title>Saurabh's XML Counter Script</title> <script language="C#" runat=server> //this script is execute when the page is loaded public void Page_Load(Object sender, EventArgs e) { //the path to the Xml file which will contain all the data //modify this if you have any other file or directory mappings. //modify this if you have been directed here from Step 2 of the ReadMe file. string datafile="db/xmlcounter.xml" ; try { //Make an instance of the XmlDataDocument class which reads data from a //xml file and stores it in an DataSet object XmlDataDocument datadoc = new XmlDataDocument();
//Open a FileStream to the Database //"FileShare.ReadWrite" enables other user to also read and write to the file FileStream fin ; fin = new FileStream(Server.MapPath(datafile), FileMode.Open, FileAccess.Read, FileShare.ReadWrite) ; // Infer the DataSet schema from the XML data and load the XML Data datadoc.DataSet.ReadXml(new StreamReader(fin)); //Close the stream fin.Close();
//get the total no of viewers by getting the count of the no of rows PResent //in the Table showtotal.Text ="Total Viewers :"+ datadoc.DataSet.Tables[1].Rows.Count.ToString() ;
//databind the Repeater to the Dataset of table '1' ie the 'Viewer' MyDataList.DataSource = datadoc.DataSet.Tables[1].DefaultView; MyDataList.DataBind();
//free the resources datadoc=null ;
} catch (Exception ed) { //if there is any exception then display it Response.Write("<font color=#FF0000>An Exception occured "+ed.ToString()+"</font>") ; } } </script> </head> <body > <h4>Welcome to Saurabh's XML Counter Viewing Page.</h4> <asp:label id="showtotal" text="" runat="server" /> <br>
