Parse HTML doc with HtmlAgilityPack-Xpath, RegExp

Question

I try parse image url from html with HtmlAgilityPack. In html doc I have img tag :

<a class="css_foto" href="" title="Fotka: MyKe015">
   <span>
      <img src="http://213.215.107.125/fotky/1358/93/v_13589304.jpg?v=6" 
           width="176" height="216" alt="Fotka: MyKe015" />
   </span>
</a>

I need get from this img tag atribute src. I need this: http://213.215.107.125/fotky/1358/93/v_13589304.jpg?v=6.

I know this:

Src atribute consist url, url start with http://213.215.107.125/fotky
I know value of alt atribute Url have variable lenght and also html doc consist other img tags with url, which start with http://213.215.107.125/fotky
I know alt attribute of img tag (Fotka: Myke015))

Any advance, I try many ways, but nothing works good.

Last I try this:

    List<string> src;

    var req = (HttpWebRequest)WebRequest.Create("http://pokec.azet.sk/myke015");
    req.Method = "GET";

    using (WebResponse odpoved = req.GetResponse())
    {
        var htmlDoc = new HtmlAgilityPack.HtmlDocument();
        htmlDoc.Load(odpoved.GetResponseStream());

        var nodes = htmlDoc.DocumentNode.SelectNodes("//img[@src]");
        src = new List<string>(nodes.Count);

        if (nodes != null)
        {
            foreach (var node in nodes)
            {
                if (node.Id != null)
                    src.Add(node.Id);
            }
        }
    }

Oded · Accepted Answer · 2010-11-02 13:02:51Z

3

Your XPath selects the img nodes, not the src attributes belonging to them.

Instead of (selecting all image tags that have a src attribute):

var nodes = htmlDoc.DocumentNode.SelectNodes("//img[@src]");

Use this (select the src attributes that are child nodes of all img elements):

var nodes = htmlDoc.DocumentNode.SelectNodes("//img/@src");

edited Nov 2, 2010 at 13:02

answered Nov 2, 2010 at 12:40

Oded

501k102 gold badges900 silver badges1k bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

Tom Over a year ago

Oded, how can I specify in Xpath value of src atribute. src="Fotka: miky015"

Oded Over a year ago

@Lucas - at this point, you can use node.InnerText to get the value.

Tom Over a year ago

Oded I use your advace, but I get error: '//img@src' has an invalid token, if I used your Xpath exp "//img@src".

Oded Over a year ago

@Lucas - apologies, I missed a /. It should be //img/@src.

user357812 · Accepted Answer · 2010-11-02 14:29:56Z

0

This XPath 1.0 expression:

//a[@alt='Fotka: MyKe015']/@src

answered Nov 2, 2010 at 14:29

user357812

Collectives™ on Stack Overflow

Parse HTML doc with HtmlAgilityPack-Xpath, RegExp

2 Answers 2

4 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

4 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related