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06.19.2007 at 02:31AM PDT, ID: 22642631
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7.0

Parsing a huge text file

Asked by G0ggy in Microsoft Visual Basic.Net, Visual Basic Programming

Tags: , , ,

Hi all,

I have a very large text file that I need to perform operations on, the file is 260MB in size and has 2.9M rows. Currently I am loading the file into an arraylist, like so:

Public Shared arMaster As New ArrayList()

Dim sr As StreamReader = New StreamReader("C:\Documents and Settings\Media Developer\My Documents\My Received Files\games_mp.log")

        Do Until sr.EndOfStream
            arMaster.Add(sr.ReadLine)
        Loop

sr.Close()

The file loads into the array pretty fast, about 20 seconds, I am loading the file into the array in memory as I want the user to be able to perform operations on it. Once the array is loaded I run a simple routine to populate a listbox (called lstPreview) so the user can see the contents of the array:

Protected Sub loadPreview(ByVal myList As IEnumerable)
        Dim myEnumerator As System.Collections.IEnumerator = myList.GetEnumerator()

        While myEnumerator.MoveNext()
            lstPreview.Items.Add(myEnumerator.Current)
        End While

        Application.DoEvents()
End Sub

However this process takes ages, maybe over 10 minutes, I don't have a stop watch with me to time, can someone suggest a better way to keep the text file in memory for filter and search and display purposes?Start Free Trial
[+][-]06.19.2007 at 02:48AM PDT, ID: 19314427

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[+][-]06.19.2007 at 02:51AM PDT, ID: 19314431

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[+][-]06.19.2007 at 02:53AM PDT, ID: 19314435

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[+][-]06.19.2007 at 02:58AM PDT, ID: 19314450

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[+][-]06.19.2007 at 03:00AM PDT, ID: 19314456

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[+][-]06.19.2007 at 03:43AM PDT, ID: 19314598

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[+][-]06.19.2007 at 03:47AM PDT, ID: 19314607

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[+][-]06.19.2007 at 03:52AM PDT, ID: 19314629

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[+][-]06.19.2007 at 04:01AM PDT, ID: 19314658

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[+][-]06.19.2007 at 05:12AM PDT, ID: 19315069

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About this solution

Zones: Microsoft Visual Basic.Net, Visual Basic Programming
Tags: text, file, parse, large
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Solution Provided By: danaseaman
Participating Experts: 5
Solution Grade: A
 
 
[+][-]06.19.2007 at 06:46AM PDT, ID: 19315733

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[+][-]06.19.2007 at 07:19AM PDT, ID: 19316019

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[+][-]06.19.2007 at 10:46AM PDT, ID: 19318122

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