How to resolve the algorithm Web scraping step by step in the Visual Basic .NET programming language

Published on 12 May 2024 09:40 PM

How to resolve the algorithm Web scraping step by step in the Visual Basic .NET programming language

Table of Contents

Problem Statement

Create a program that downloads the time from this URL:   http://tycho.usno.navy.mil/cgi-bin/timer.pl   and then prints the current UTC time by extracting just the UTC time from the web page's HTML. Alternatively, if the above url is not working, grab the first date/time off this page's talk page.

If possible, only use libraries that come at no extra monetary cost with the programming language and that are widely available and popular such as CPAN for Perl or Boost for C++.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Web scraping step by step in the Visual Basic .NET programming language

Source code in the visual programming language

Imports System.Net
Imports System.IO
        Dim client As WebClient = New WebClient()
        Dim content As String = client.DownloadString("http://tycho.usno.navy.mil/cgi-bin/timer.pl")
        Dim sr As New StringReader(content)
        While sr.peek <> -1
            Dim s As String = sr.ReadLine
            If s.Contains("UTC") Then
                Dim time As String() = s.Substring(4).Split(vbTab)
                Console.WriteLine(time(0))
            End If
        End While


Imports System.Net
        Dim client As WebClient = New WebClient()
        Dim content As String = client.DownloadString("http://tycho.usno.navy.mil/cgi-bin/timer.pl")
        Dim lines() As String = Split(content, vbLf) 'may need vbCrLf 
        For Each line In lines
            If line.Contains("UTC") Then
                Dim time As String() = line.Substring(4).Split(vbTab)
                Console.WriteLine(time(0))
            End If
        Next


  

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