Problem with Text file filtering

  • Thread starter Thread starter Quentin
  • Start date Start date
Q

Quentin

I am currently working with a text file and cannot seem to get it to
filter right. I am trying to delete every line above a keyword
"Recipe" and every line below a keyword. Or just move every line
between those key words to a new file. Either way I having
difficulties. Below is a sample of the text file and code.

Sample file (only original is much larger)

2,3,56,554,22,11,1,2,9,
234,42,12,4,4,4,,2,3,2,3
"Recipe"
2,3,32545,655,5656,56,
4,56,4565,56,565,654,45,
2,45,46,456,473,6,67565
"End of Recipe"
2,7,5,7,452,7,6,8,5,4,7,4
54,6,6,4,6,578,5,6,56,7,5,

I would only like to keep what is inbetween Recipe and End of Recipe.


Dim streamR As StreamReader = IO.File.OpenText_("c:\MultiTemp1.txt")
Dim streamw As StreamWriter = IO.File.CreateText_("c:
\filtered2.txt")
Dim strInput As String

While Not streamR.EndOfStream
strInput = streamR.ReadLine

If strInput.Contains("End") Then
Else

If InStr(strInput, "Recipe", CompareMethod.Text) > 0
Then
strInput = streamR.ReadLine
streamw.WriteLine(strInput)

End If
End If

End While

streamw.Close()
streamR.Close()

Any help would by great.thanks!
 
Well the easiest way is to set a flag "bWriting" when you start writing and
clear the flag when you stop (i.e. when you encounter your "End"). Of
course this won't work if the "End" comes directly after the "Recipie",
because the output file will contain the "End" line as well. I leave that
as an excersise for you just in case this is school/coursework (its a simple
fix) ;). I didn't test the code below, so.....

Dim streamR As StreamReader = IO.File.OpenText("c:\MultiTemp1.txt")
Dim streamw As StreamWriter = IO.File.CreateText("c:\filtered2.txt")
Dim strInput As String
Dim bWriting As Boolean = False

While Not streamR.EndOfStream

strInput = streamR.ReadLine

If strInput.StartsWith("""Recipie") Then
bWriting = True
strInput = streamR.ReadLine
ElseIf strInput.StartsWith("""End") Then
bWriting = False
strInput = streamR.ReadLine
End If

If bWriting Then
streamw.WriteLine(strInput)
End If

End While

streamw.Close()
streamR.Close()
 
***************
Imports System
Imports System.IO
Imports System.IO.FileStream

Public Class Form1

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

Dim streamR As StreamReader = New StreamReader("C:\Temp\Input.txt")
Dim streamW As StreamWriter = New StreamWriter("C:\Temp\Output.txt")

Dim strInput As String

While Not streamR.EndOfStream

strInput = streamR.ReadLine

If strInput.Contains("Recipe") Then

strInput = streamR.ReadLine

While Not strInput.Contains("End of Recipe")
streamW.WriteLine(strInput)
strInput = streamR.ReadLine
End While

streamW.Flush()
streamW.Close()

End If

End While

streamR.Close()

End Sub

End Class
*************************

Assumptions: UserForm is called "Form1", 1 button on UserForm called
"Button1".

HTH, CoRrRan
 
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