Cannot grab strings from html tags

This is a discussion on Cannot grab strings from html tags within the C++ Programming forums, part of the General Programming Boards category; Hi guys, I am using managed c++/cli. I have a trouble with my code, I cannot be able to grab ...

  1. #1
    Registered User
    Join Date
    Apr 2011
    Posts
    40

    Cannot grab strings from html tags

    Hi guys,

    I am using managed c++/cli. I have a trouble with my code, I cannot be able to grab the html tags from my website using with httprequest.

    Here's the html tags:

    PHP Code:
    <a href="delete.php?test=test&id=1">Delete</a> </td



    Here's the current code:

    Code:
    try
            {
                Form1 ^form1 = dynamic_cast<Form1 ^>(Owner);
                //Address of URL
                String ^URL = "http://mysite.com/members.php?user=" + form2->label1->Text + "&pass=" + form2->label2->Text;
                HttpWebRequest ^request = safe_cast<HttpWebRequest^>(WebRequest::Create(URL));
                HttpWebResponse ^response = safe_cast<HttpWebResponse^>(request->GetResponse());
                StreamReader ^reader = gcnew StreamReader(response->GetResponseStream());
                String ^str = reader->ReadToEnd();
                String ^pattern1 = form1->ListView1->SelectedItems[0]->Text + "</p><p id=\"delete\"> <a href=\"delete.php\\?delete.php?test=test&id=(.*?)\">";
                Match ^m1 = Regex::Match(str, pattern1);
                MatchCollection ^matches1 = Regex::Matches(str, pattern1);
    
                for each (Match ^x1 in matches1)
                {
                    MessageBox::Show("test 1");
                    array<String^> ^StrArr1 = x1->Value->ToString()->Split();
                    String ^test = (URL + x1->Value->ToString()->Replace(form1->ListView1->SelectedItems[0]->Text, "")->Replace("</p><p id=\"delete\"> <a href=\"", "")->Replace("\"" + ">", ""));
                    MessageBox::Show(test);
                }
             }
            catch (Exception ^ex)
             {
            }


    Do you know why and what's wrong?

    Any advice would be much appreciated.

    Thanks,
    Mark

  2. #2
    Cat without Hat CornedBee's Avatar
    Join Date
    Apr 2003
    Posts
    8,893
    This part of the regex looks wrong:

    \"delete.php\\?delete.php?test=test

    Apart from the duplicated delete.php, there's unescaped question marks and dots.
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

  3. #3
    a_capitalist_story
    Join Date
    Dec 2007
    Posts
    2,652
    Where you're using .NET, look to leverage the HTML Agility Pack for parsing HTML documents.

  4. #4
    Registered User
    Join Date
    Apr 2011
    Posts
    40
    Quote Originally Posted by rags_to_riches View Post
    Where you're using .NET, look to leverage the HTML Agility Pack for parsing HTML documents.
    sorry i don't know how to use it. please can you help?

  5. #5
    Registered User
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    Apr 2011
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    do anyone know how to do this????????????

  6. #6
    - - - - - - - - oogabooga's Avatar
    Join Date
    Jan 2008
    Posts
    2,808
    Did you read CornedBee's response?
    Apart from the duplicated delete.php, there's unescaped question marks and dots.
    Try this for your regex:
    Code:
    "</p><p id=\"delete\"> <a href=\"delete\.php\?test=test&id=(.*?)\">"
    The cost of software maintenance increases with the square of the programmer's creativity. - Robert D. Bliss

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