read HTML tag text

Question

Hi All I would like to get the following output from htm ot html files: 1. MY WEBSITE (Means to get text between TITLE tags) 2. left (Means to align values of p tag) 3. boat.gif (Means to src values of img tag) MY WEBSITE My First Heading My first paragraph. Thanks Allot in Advance Darma

Vulpes · Answer

If you have multiple tags you can do: string regExp3 = @ MatchCollection mc = Regex.Matches(html regExp3); foreach(Match m in mc) Console.WriteLine(m.Groups[1].Value);

darma teja · Answer

Hi Vulpes If i have more than one image how can get all images with their path. Thanks Darma

Raj Bandi · Answer

Hi Im not sure why it wasn't working for you. HtmlAgilityPack is well tested and is fast. Here is the code static void Main(string[] args) { var doc = new HtmlDocument(); doc.Load(e:\temp\dharma.html); string align = string.Emptysrc = string.Emptytitle = string.Empty; var titleNode = doc.DocumentNode.SelectSingleNode(//title); if(titleNode != null) { title = titleNode.InnerText; } var p = doc.DocumentNode.SelectSingleNode(//p[@align]); if(p != null) { align = p.Attributes[align].Value; } var img = doc.DocumentNode.SelectSingleNode(//img[@src]); if(img != null) { src = img.Attributes[src].Value; } Console.WriteLine(title); Console.WriteLine(align); Console.WriteLine(src); }

darma teja · Answer

Hi Vulpes and Raj Thanks for the replies. @Vulpes: Perfectly It is working. @ Raj: First I tried with  HtmlAgilityPack Unfortunately it was not working. Thanks Darma

Raj Bandi · Answer

Hmm Sorry my bad incorrectly interpreted I thought it was on the client side in browser so you want read this in C# Use HtmlAgilityPack http://htmlagilitypack.codeplex.com/  add references to your project. var doc = new HtmlDocment(); doc.load(yourfile.htm); Use xpath queries something like this var p = doc.DocumentElement.SelectNodes(//p[@align]);

Vulpes · Answer

Here's a different approach using regular expressions. As I don't know what type of application you're writing I've used a console application for illustration: using System; using System.IO; using System.Text.RegularExpressions; class Test { static void Main() { string html = File.ReadAllText(darma.html); string regExp1 =  (.*?) ; string title = Regex.Match(html regExp1).Groups[1].Value; Console.WriteLine(title); string regExp2 = @ ; string align = Regex.Match(html regExp2).Groups[1].Value; Console.WriteLine(align); string regExp3 = @ string img = Regex.Match(html regExp3).Groups[1].Value; Console.WriteLine(img); Console.ReadKey(); } } The output as expected is: MY WEBSITE left boat.gif

darma teja · Answer

Hi Raj Thanks for the reply. Which class I should use to load my html file by giving file path. Thanks Darma

Raj Bandi · Answer

//MY WEBSITE var title = document.title; //left value Note: without an id get p first element with id use document.getElementById var align = document.getElementsByTagName(p)[0].getAttribute(align); //boat.gif var src = document.getElementsByTagName(img)[0].getAttribute(src); Call above scripts when dom is ready ie. either call a function on body load or include above script between and tags(when all the dom elements are processed). Hope this helps Cheers Raj