I'm trying to create a small program that takes a html file as an input, and writes all links into a new output file. My problem is that the output file is empty. When debugging, it looks like I get stuck in the foreach loop. The code after the foreach loop is not being executed, and no exception is being thrown. What do I do wrong? It's a WinForms application, as I plan to implement more functions and a GUI.
I'll just paste the whole code that I have so far
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
using System.Text.RegularExpressions;
using System.Text;
namespace Link_Grabber
{
internal static class Program
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
string inputFilePath = GetInputFilePath();
if (string.IsNullOrEmpty(inputFilePath))
{
MessageBox.Show("No input file selected.");
return;
}
string outputFilePath = "output.txt";
string htmlContent = File.ReadAllText(inputFilePath);
string pattern = @"(?i)\b((?:https?://|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:'"".,<>?«»“”‘’]))";
MatchCollection matches = Regex.Matches(htmlContent, pattern);
outputFilePath = GetOutputFilePath();
if (string.IsNullOrEmpty(outputFilePath))
{
MessageBox.Show("No output file selected.");
return;
}
try
{
using (StreamWriter writer = new StreamWriter(outputFilePath, false, Encoding.ASCII))
{
writer.WriteLine("Entered writer");
foreach (Match match in matches)
{
writer.WriteLine(match.Value);
//(MessageBox.Show("Match found: " + match.Value);
}
MessageBox.Show("Before flush");
writer.Flush(); // Flush the writer to ensure content is written to the file
MessageBox.Show("After flush");
MessageBox.Show("Before close");
writer.Close(); // Close the writer to release the file resources
MessageBox.Show("After close");
}
MessageBox.Show("URLs extracted and saved to output.txt.");
}
catch (Exception ex)
{
MessageBox.Show("An error occurred while writing the file: " + ex.Message);
}
}
static string GetInputFilePath()
{
OpenFileDialog openFileDialog = new OpenFileDialog();
openFileDialog.Filter = "HTML Files (*.html;*.htm)|*.html;*.htm|All Files (*.*)|*.*";
if (openFileDialog.ShowDialog() == DialogResult.OK)
{
return openFileDialog.FileName;
}
return null;
}
static string GetOutputFilePath()
{
SaveFileDialog saveFileDialog = new SaveFileDialog();
saveFileDialog.Filter = "Text Files (*.txt)|*.txt|All Files (*.*)|*.*";
if (saveFileDialog.ShowDialog() == DialogResult.OK)
{
return saveFileDialog.FileName;
}
return null;
}
}
}
I want the URLs written to the output file. Without the foreach loop, it works fine. Sadly I can't spot the issue in the foreach loop.
EDIT:
when using Flush() inside the foreach loop, it works, and the content is written to the file. It still gets stuck after the loop, though. The cursor jumps to "in" in "foreach (Match match in matches)" and then nothing happens.
I'm using Visual Studio, .NET 6.8. I added the HtmlAgilityPack, rest is pretty default. The HTML I use for testing:
<!DOCTYPE html>
<html prefix="og: http://ogp.me/ns# fb: http://ogp.me/ns/fb#" lang="de">
<head>
<meta charset="utf-8" />
<base href="//bs.to/" />
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="security_token" content="fbfae1fdcffb4284af9ba3b7" />
<meta name="description" content="Schaue auf Burning Series mehr als 4000 Serien wie Die Simpsons, The Big Bang Theory und viele mehr gratis." />
<meta name="keywords" content="bs, bs.to, burningseries.co, Burning Series, Serien, Streaming, Netflix, Die Simpsons, The Big Bang Theory, Two and a Half Men, How I Met Your Mother" />
<meta name="robots" content="index, follow" />
<meta property="og:type" content="website" />
<meta property="og:title" content="The Boondocks (1) - Burning Series: Serien online sehen" />
<meta property="og:url" content="https://bs.to/serie/The-Boondocks/1/de" />
<meta property="og:image" content="https://bs.to/opengraph.jpg" />
<meta property="og:description" content="Schaue auf Burning Series mehr als 4000 Serien wie Die Simpsons, The Big Bang Theory und viele mehr gratis." />
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<section class="serie">
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<h2>
The Boondocks
<small>Staffel 1</small>
</h2>
<p>Als „Granddad“ Freeman das Sorgerecht für seine beiden wilden Enkel übertragen bekommt, zieht er mit Sack und Pack aus dem Süden Chicagos in die ruhige und sichere Nachbarschaft Woodcrest. Er hofft, die Jungs dort in Ruhe ignorieren zu können, um seine letzten Jahre in Frieden zu genießen. Doch weder Huey, ein linksgerichteter Revoluzzer, noch sein eigenwilliger 8-jähriger Bruder Riley sind mit dieser Veränderung zufrieden und beginnen die vorwiegend „weiße“ Nachbarschaft zu provozieren.</p>
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<span>Genres</span>
<p>
<span style="font-weight: bold;">Zeichentrick</span>
</p>
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<span>Produktionsjahre</span>
<p>
<em>2005 - <i>Unbekannt</i></em>
</p>
</div>
<div>
<span>Hauptdarsteller</span>
<p>
<span class="no-entry"><i>Keine Angabe</i></span>
</p>
</div>
<div>
<span>Produzenten</span>
<p>
<span>Aaron McGruder,</span>
<span>Rodney Barnes</span>
</p>
</div>
<div>
<span>Regisseure</span>
<p>
<span>Bob Hathcock,</span>
<span>Seung Eun Kim,</span>
<span>Sung-hoon Kim</span>
</p>
</div>
<div>
<span>Autoren</span>
<p>
<span>Aaron McGruder</span>
</p>
</div>
</div>
</div>
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<strong>Staffeln</strong>
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<ul class="clearfix">
<li class="s1"><a href="serie/The-Boondocks/1/de">1</a></li>
<li class="s2"><a href="serie/The-Boondocks/2/de">2</a></li>
<li class="s3"><a href="serie/The-Boondocks/3/de">3</a></li>
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<table class="episodes">
<tr class="">
<td><a href="serie/The-Boondocks/1/1-The-Garden-Party/de" title="The Garden Party">1</a></td>
<td>
<a href="serie/The-Boondocks/1/1-The-Garden-Party/de" title="The Garden Party">
<strong>The Garden Party</strong>
</a>
</td>
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</tr>
<tr class="">
<td><a href="serie/The-Boondocks/1/2-The-Trial-of-Robert-Kelly/de" title="The Trial of Robert Kelly">2</a></td>
<td>
<a href="serie/The-Boondocks/1/2-The-Trial-of-Robert-Kelly/de" title="The Trial of Robert Kelly">
<strong>The Trial of Robert Kelly</strong>
</a>
</td>
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<tr class="">
<td><a href="serie/The-Boondocks/1/3-Guess-Hoe-s-Coming-to-Dinner/de" title="Guess Hoe's Coming to Dinner">3</a></td>
<td>
<a href="serie/The-Boondocks/1/3-Guess-Hoe-s-Coming-to-Dinner/de" title="Guess Hoe's Coming to Dinner">
<strong>Guess Hoe's Coming to Dinner</strong>
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</tr>
<tr class="">
<td><a href="serie/The-Boondocks/1/4-Granddad-s-Flight/de" title="Granddad’s Flight">4</a></td>
<td>
<a href="serie/The-Boondocks/1/4-Granddad-s-Flight/de" title="Granddad’s Flight">
<strong>Granddad’s Flight</strong>
</a>
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<tr class="">
<td><a href="serie/The-Boondocks/1/5-A-Date-with-the-Health-Inspector/de" title="A Date with the Health Inspector">5</a></td>
<td>
<a href="serie/The-Boondocks/1/5-A-Date-with-the-Health-Inspector/de" title="A Date with the Health Inspector">
<strong>A Date with the Health Inspector</strong>
</a>
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<tr class="">
<td><a href="serie/The-Boondocks/1/6-The-Story-Of-Gangstalicious/de" title="The Story Of Gangstalicious">6</a></td>
<td>
<a href="serie/The-Boondocks/1/6-The-Story-Of-Gangstalicious/de" title="The Story Of Gangstalicious">
<strong>The Story Of Gangstalicious</strong>
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</tr>
<tr class=" disabled">
<td><a href="serie/The-Boondocks/1/7-Merry-Christmas-Huey-Freeman/de" title="Merry Christmas, Huey Freeman">7</a></td>
<td>
<a href="serie/The-Boondocks/1/7-Merry-Christmas-Huey-Freeman/de" title="Merry Christmas, Huey Freeman">
<strong>Merry Christmas, Huey Freeman</strong>
</a>
</td>
<td>
</td>
</tr>
<tr class="">
<td><a href="serie/The-Boondocks/1/8-The-Reality/de" title="The Reality">8</a></td>
<td>
<a href="serie/The-Boondocks/1/8-The-Reality/de" title="The Reality">
<strong>The Reality</strong>
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<td><a href="serie/The-Boondocks/1/9-Return-of-the-King/de" title="Return of the King">9</a></td>
<td>
<a href="serie/The-Boondocks/1/9-Return-of-the-King/de" title="Return of the King">
<strong>Return of the King</strong>
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<td><a href="serie/The-Boondocks/1/10-The-It-is/de" title="The It is">10</a></td>
<td>
<a href="serie/The-Boondocks/1/10-The-It-is/de" title="The It is">
<strong>The It is</strong>
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<tr class="">
<td><a href="serie/The-Boondocks/1/11-Let-s-Nab-Oprah/de" title="Let’s Nab Oprah">11</a></td>
<td>
<a href="serie/The-Boondocks/1/11-Let-s-Nab-Oprah/de" title="Let’s Nab Oprah">
<strong>Let’s Nab Oprah</strong>
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<td><a href="serie/The-Boondocks/1/12-Riley-Wuz-Here/de" title="Riley Wuz Here">12</a></td>
<td>
<a href="serie/The-Boondocks/1/12-Riley-Wuz-Here/de" title="Riley Wuz Here">
<strong>Riley Wuz Here</strong>
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<td><a href="serie/The-Boondocks/1/13-Wingmen/de" title="Wingmen">13</a></td>
<td>
<a href="serie/The-Boondocks/1/13-Wingmen/de" title="Wingmen">
<strong>Wingmen</strong>
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<td><a href="serie/The-Boondocks/1/14-The-Block-is-Hot/de" title="The Block is Hot">14</a></td>
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<a href="serie/The-Boondocks/1/14-The-Block-is-Hot/de" title="The Block is Hot">
<strong>The Block is Hot</strong>
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<td><a href="serie/The-Boondocks/1/15-The-Passion-of-Reverend-Ruckus/de" title="The Passion of Reverend Ruckus">15</a></td>
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<a href="serie/The-Boondocks/1/15-The-Passion-of-Reverend-Ruckus/de" title="The Passion of Reverend Ruckus">
<strong>The Passion of Reverend Ruckus</strong>
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The problem here is not in your C# code but rather your regular expression. Specifically, catastrophic backtracking is occurring, causing the evaluation of matches to take a very long time (effectively hanging your application).
To see this, go to a regex test site such as Regex101 and test your regex against your HTML file. (You will need to escape the three forward slashes in your regex by changing each instance of / to \/.)
The result will be:
Catastrophic backtracking has been detected and the execution of your expression has been halted. To find out more and what this is, please read the following article: Runaway Regular Expressions
You can also use the Regex101 debugger to step through and find the problem.
In summary: your C# code is ok but your regex is not sufficiently robust to handle all HTML files safely. Perhaps consider a different approach, such as using a library to identify hyperlinks.