Question C# to VB.NET for IFilter

GoodJuJu

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Apr 26, 2010
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Hi there, I am new to this site and also new to C# and VB.NET.

I am proficient in Visual Basic, but I think I need to use .net and move with the times to achieve what I want.

I am trying to write an application which extracts text from documents (.doc, .pdf, .xls etc. etc) using IFilter.

I have found a very good example application in C# (Using IFilter in C# - CodeProject) which does what I want, but I am really struggling with C#

Does anybody know if there is a way to achieve the same results (i.e. extracting text from documents using IFilter) in VB?

I have found a few examples on the web which do not seem to explain much - most examples I see are in C#. I would love to be able to just learn C# and make it work, but the reality is I really need to use VB as I am just more comfortable with it.

Any help anyone can offer is much appreciated.

Thanks.
 

JohnH

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Why do you need to convert the code? You can use the download from that article, add reference to EPocalipse.IFilter.dll library and use it from your VB.Net project:
Code:
Using reader As New EPocalipse.IFilter.FilterReader("filename")
    TextBox1.Text = reader.ReadToEnd()
End Using
 

GoodJuJu

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Thanks, but do I also need to reference the classes?

JohnH,

Thanks very much for your response.

Excuse my ignorance please. Would I also need to reference the classes from the C# project, or are these bundled in the .dll already?

Thank you.
 

GoodJuJu

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JohnH, you're a genius!!! It works!! I guess the classes get 'wrapped' in the .dll

Thank you very much for your suggestion.

It even 'spews' the error out of the dll if it encounters one which I can handle inside of my code.

I appreciate your help.
 

zyborski

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Oct 19, 2011
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Problems with code

Hi

If I run the sample C# code it works fine and extracts text from docs, pdf, etc.

I converted it to run in VB.net using the following code

Imports System.IO




Public Class Form1


Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click


Dim d As New OpenFileDialog
d.Filter = "All Files|*.*"
If d.ShowDialog() = DialogResult.OK Then


Dim reader As TextReader = New EPocalipse.IFilter.FilterReader(d.FileName)
Using reader
TextBox1.Text = reader.ReadToEnd()
End Using


End If
End Sub



End Class

It works for doc files, but every time I try and open a pdf file I get a "NotImplementedException" error?

My first though was that I dont have the ifilter for pdf, but it works in c#

Any ideas?

Thanks

Zyb
 

zyborski

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Oct 19, 2011
Messages
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Programming Experience
3-5
Fixed it

Hi

Fixed it.

I had downloaded a 64 bit version of the PDF ifilter during my tests, and the app was compiled as 32 bit. Forced it to compile as 64 bit and it worked.

Zyb
 
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