Reading Unknown Number Of Lines In A File - vb.net

I have about 20 files, each file has a short description that starts on line 7 and goes to the 3rd to last line of the file.
For example, one file has the description started at line 7, and ends at line 10, but the file has a total of 13 lines.
How can I import JUST the description, for example line 7 - 10?
This is the example code I have so far.
Public Class Form1
Dim MyDir As String = "..\GoodFils\"
Dim MyFiles() As String = IO.Directory.GetFiles(MyDir)
Dim Count As Integer = 0
Public Function ReadLine(lineNumber As Integer, lines As List(Of String)) As String
Return lines(lineNumber - 1)
End Function
Private Sub btnDo_Click(sender As Object, e As EventArgs) Handles btnDo.Click
Dim reader As New System.IO.StreamReader(MyDir & "gucci.hcs")
Dim allLines As List(Of String) = New List(Of String)
Dim i As Integer
Dim strTemp As String
Do Until reader.EndOfStream = True
allLines.Add(reader.ReadLine())
Loop
lblName.Text = ReadLine(2, allLines)
lblPrice.Text = ReadLine(5, allLines)
lblDesc.Text = EOF(1) - 3
reader.Close()
FileOpen(1, MyDir & "gucci.hcs", OpenMode.Input) 'May be able to use MyDir & lblName & ".hcs"
For i = 7 To reader.EndOfStream
Input(1, strTemp)
Next
lblDesc.Text += i
FileClose(1)
End Sub
End Class

You can load the contents of each individual file into an Array by using IO.File.ReadAllLines and then you can use LINQ to Skip to jump to line 7 and then Take up to the 3rd to last line.
Here is a quick example:
'Create a collection to store all of the file's descriptions
Dim descriptions As New List(Of String)
'Placeholder variable for the upcoming iteration
Dim lines() As String
'Iterate through each file
For Each file As IO.FileInfo In New IO.DirectoryInfo("GoodFils").GetFiles("*.txt")
'Read the file
lines = IO.File.ReadAllLines(file.FullName)
'Get only lines 7 to n-3
descriptions.Add(String.Join(Environment.NewLine, lines.Skip(6).Take(lines.Count - 10).ToArray()))
Next
Fiddle: Live Demo

Related

How to combine all csv files from the same folder into one data

I want merge multiple csv files with same layout from the same folder
example :
csv1.csv
ID, PINA,PINB,PCS
1,100,200,450
2,99,285,300
csv2.csv
ID, PINA,PINB,PCS
1,100,200,999
2,99,285,998
out.csv (The file I want make by VB.net)
ID, PINA,PINB,PCS,PCS
1,100,200,450,999
2,99,285,300,998
my problem code :
Dim FileReader As StreamReader
Dim i As Integer = 0
Dim temp As String
For i = 0 To LstFiles.Items.Count - 1
FileReader = File.OpenText(LstFiles.Items.Item(i))
temp = FileReader.ReadToEnd
File.AppendAllText(SaveFileDialog1.FileName, temp)
Next
Please guide me.
Thanks a lot !
Looks to me like each line in the input files has an identifier based on the first value in that row. You want to combine all the numbers after that identifier, from all the files in your ListBox, into one list of numbers that is sorted and has no duplicates. Then you want to generate an output file that has all those identifiers followed by each set of sorted, unique numbers.
If that is correct, then try this out:
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
If SaveFileDialog1.ShowDialog = DialogResult.OK Then
Dim header As String = ""
Dim combinedLines As New SortedList(Of Integer, List(Of Integer))
For Each filename As String In LstFiles.Items
Dim lines = File.ReadLines(filename)
If header = "" Then
header = lines.First
End If
lines = lines.Skip(1)
For Each line As String In lines
Dim strValues = line.Split(",").AsEnumerable
Try
Dim lineNumber As Integer = Integer.Parse(strValues.First)
strValues = strValues.Skip(1)
Dim numbers = strValues.ToList.ConvertAll(Of Integer)(Function(x) Integer.Parse(x))
If Not combinedLines.ContainsKey(lineNumber) Then
combinedLines.Add(lineNumber, New List(Of Integer)(numbers))
Else
combinedLines(lineNumber).AddRange(numbers)
End If
Catch ex As Exception
MessageBox.Show("Error Parsing Line: " & line)
End Try
Next
Next
Using sw As New StreamWriter(SaveFileDialog1.FileName, False)
sw.WriteLine(header)
For Each numberSet In combinedLines
Dim numbers = numberSet.Value.Distinct.ToList
numbers.Sort()
sw.WriteLine(numberSet.Key & "," & String.Join(",", numbers))
Next
End Using
End If
End Sub

Picking out 1 specific string from a file

Ive put in multiple strings in 1 line of a file, so that they are linked together, I have tried multiple ways such as using loops and I was wondering if if anyone could help me, thanks.
in file: swagman (username), samfisher34 (password), sam fisher (fullname)
Private Sub btn_login_Click(sender As Object, e As EventArgs) Handles btn_login.Click
Dim Student As New StreamReader("student.txt")
Dim newline As String
Dim login As Boolean
Dim line1 As String
Dim line2 As String
' Reads the files to a string and write the string to the console.
Dim count As Integer = 20
For i = 1 To count
newline = Student.ReadLine
If txt_login.Text = newline And txt_password.Text = newline Then
'Checks to see if text is the same in the Files.
login = True
End If
If login = True Then
Me.Hide()
StudentMenu.Show()
End If
Next
If login = False Then
MsgBox("login or password is incorrect")
End If
Student.Close()
End Sub
Here is a really basic code example that I made:
First of all you need to import System.IO for the StreamReader
Dim objStreamReader As StreamReader
Dim strLine As String
objStreamReader = New StreamReader(File)
Dim splitresult As Array
'read the file line for line
Do Until objStreamReader.Peek = -1
strLine = objStreamReader.ReadLine
'split the results (user,pwd,name)
splitresult = strLine.Split(",")
If splitresult(0) = user Then
If splitresult(1) = pwd Then
MsgBox("Welcome " & splitresult(2))
End If
Loop
Also please don't store your password as plain text.

This code is supposed to output the number of times a word starts with a letter from the alphabet, but just displays zero for each one

This code is supposed to output the number of times a word starts with a letter from the alphabet, but just displays zero for each one
I get no errors, but just a text file with all of the letters and zero for each one.
When pressing the debug button, it appears to do nothing. Here's the code
Imports System.IO
Module Module1
Sub Main()
Dim myArray As New List(Of String)
Using myReader As StreamReader = New StreamReader(".\myFile.txt")
'telling VB that we're using a StreamREader, read a line at a time
Dim myLine As String
myLine = myReader.ReadLine 'assigns the line to String Variable myLine
Do While (Not myLine Is Nothing)
myArray.Add(myLine) 'adding it to the list of words in the array
Console.WriteLine(myLine)
myLine = myReader.ReadLine
Loop
End Using
SortMyArray(myArray) 'Calls the new SubRoutine => SortMyArray, passing through the parameter myArray,
'created back on line 7 that stores all of the lines read from the text file.
'Console.ReadLine()
wordCount(myArray)
End Sub
Sub SortMyArray(ByVal mySort As List(Of String))
Dim Tmp As String, writePath As String = ".\sorted.txt"
Dim max As Integer = mySort.Count - 1
Dim myWriter As StreamWriter = New StreamWriter(writePath)
For Loop1 = 0 To max - 1
For Loop2 = Loop1 + 1 To max
If mySort(Loop1) > mySort(Loop2) Then
Tmp = mySort(Loop2)
mySort(Loop2) = mySort(Loop1)
mySort(Loop1) = Tmp
End If
Next
myWriter.WriteLine(mySort.Item(Loop1).ToString())
Next
myWriter.Dispose()
End Sub
Sub wordCount(ByVal stringArray As List(Of String))
Dim alphabet As String = "abcdefghijklmnopqrstuvwxyz", myString As String
Dim writePath As String = ".\counted.txt"
Dim myWriter As StreamWriter = New StreamWriter(writePath)
Dim countOf(25) As Integer, Max As Integer = stringArray.Count - 1
For Loop1 = 0 To 25
myString = alphabet.Substring(Loop1, 1)
For Loop2 = 0 To Max
If stringArray(Loop2).Substring(0, 1) = myString Then
countOf(Loop1) += 1
End If
Next
myWriter.WriteLine(myString & " occured " & countOf(Loop1) & " times ")
Next
myWriter.Dispose()
End Sub
End Module
Any help would be appreciated. Thanks

Loop through the lines of a text file in VB.NET

I have a text file with some lines of text in it.
I want to loop through each line until an item that I want is found*, then display it on the screen, in the form of a label.
*I am searching for the item through a textbox.
That is, in sudo:
For i = 0 To number of lines in text file
If txtsearch.text = row(i).text Then
lbl1.text = row(i).text
Next i
You can use the File.ReadLines Method in order to iterate throughout your file, one line at a time. Here is a simple example:
Dim Term As String = "Your term"
For Each Line As String In File.ReadLines("Your file path")
If Line.Contains(Term) = True Then
' Do something...Print the line
Exit For
End If
Next
Here's a function that will spit back your string from the row that contains your search term...
Public Shared Function SearchFile(ByVal strFilePath As String, ByVal strSearchTerm As String) As String
Dim sr As StreamReader = New StreamReader(strFilePath)
Dim strLine As String = String.Empty
Try
Do While sr.Peek() >= 0
strLine = String.Empty
strLine = sr.ReadLine
If strLine.Contains(strSearchTerm) Then
sr.Close()
Exit Do
End If
Loop
Return strLine
Catch ex As Exception
Return String.Empty
End Try
End Function
To use the function you can do this...
Dim strText As String = SearchFile(FileName, SearchTerm)
If strText <> String.Empty Then
Label1.Text = strText
End If
LOOPING AND GETTING ALL XML FILES FROM DIRECTORY IF WE WANT TEXTFILES PUT "*.txt" IN THE PLACE OF "*xml"
Dim Directory As New IO.DirectoryInfo(Path)
Dim allFiles As IO.FileInfo() = Directory.GetFiles("*.xml")
allFiles = allFiles.OrderByDescending(Function(x) x.FullName).ToArray()
Dim singleFile As IO.FileInfo
For Each singleFile In allFiles
'ds.ReadXml(singleFile)
xd.Load(singleFile.FullName)
Dim nodes As XmlNodeList = xd.DocumentElement.SelectNodes("/ORDER/ORDER_HEADER")
Dim ORDER_NO As String = " "
For Each node As XmlNode In nodes
If Not node.SelectSingleNode("ORDER_NO") Is Nothing Then
ORDER_NO = node.SelectSingleNode("ORDER_NO").InnerText
End If
Next
Next

How to replace multiple consective lines in a line and skip the header for that section

I need to find a section header, in this case "[Store Hours]", in a text file that I'm using to save the settings for the program. I need to skip the header and replace the next 7 lines with the text that is in the text boxes. The code below currently deletes the header "[Store Hours]" and does not replace any of the lines.
Dim objFileName As String = "Settings.txt"
Private Sub BtnAdd_Click(sender As System.Object, e As System.EventArgs) Handles btnSaveHours.Click
Dim OutPutLine As New List(Of String)()
Dim matchFound As Boolean
For Each line As String In System.IO.File.ReadAllLines(objFileName)
matchFound = line.Contains("[Store Hours]")
If matchFound Then
'does not skip the header line
line.Skip(line.Length)
'Need to loop through this 7 times (for each day of the week)
'without reading the header again
For intCount = 0 To 6
Dim aryLabelDay() As String = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"}
Dim varLabelNameIn As String = "txt" & aryLabelDay(intCount).ToString & "In"
Dim varDropNameIn As String = "drp" & aryLabelDay(intCount).ToString & "In"
Dim varLabelNameOut As String = "txt" & aryLabelDay(intCount).ToString & "Out"
Dim varDropNameOut As String = "drp" & aryLabelDay(intCount).ToString & "Out"
Dim varTextBoxInControl() As Control = Me.Controls.Find(varLabelNameIn, True)
Dim varDropBoxInControl() As Control = Me.Controls.Find(varDropNameIn, True)
Dim varTextBoxOutControl() As Control = Me.Controls.Find(varLabelNameOut, True)
Dim varDropBoxOutControl() As Control = Me.Controls.Find(varDropNameOut, True)
Dim dymTextNameIn As TextBox = DirectCast(varTextBoxInControl(0), TextBox)
Dim dymDropNameIn As ComboBox = DirectCast(varDropBoxInControl(0), ComboBox)
Dim dymTextNameOut As TextBox = DirectCast(varTextBoxOutControl(0), TextBox)
Dim dymDropNameOut As ComboBox = DirectCast(varDropBoxOutControl(0), ComboBox)
Dim ReplaceLine As String
ReplaceLine = dymTextNameIn.Text & "," & dymDropNameIn.Text & "," & dymTextNameOut.Text & "," & dymDropNameOut.Text
'this doesn't replace anything
line.Replace(line, ReplaceLine)
intCount += 1
Next intCount
Else
OutPutLine.Add(line)
End If
Next
End Sub
Instead of using ReadAllLines simply use a streamreader and read the file line by line, like this;
Dim line As String
Using reader As StreamReader = New StreamReader("file.txt")
' Read one line from file
line = reader.ReadLine
If(line.Contains("[Store Hours]") Then
'The current line is the store hours header, so we skip it (read the next line)
line = reader.ReadLine
'Process the line like you want, and keep processing through the lines by doing a readline each time you want to progress to the next line.
End If
End Using
More importantly though, you should not be saving the settings for your program in a text file. They should be stored in app.config or web.config. See this question for further guidance on that.
Part of your confusion might be coming from the fact that you can't just replace part of a text file without copying it and overwriting it. One way, to do this, is to copy the file to memory changing the appropriate lines and overwriting the existing file with the new information. Here's one way that can be done:
Private Sub BtnAdd_Click(sender As System.Object, e As System.EventArgs) Handles btnSaveHours.Click
Dim OutPutLine As New List(Of String)()
Dim sr As New StreamReader(objFileName)
While Not sr.EndOfStream
Dim line = sr.ReadLine
'Found the header so let's save that line to memory and add all the other _
info after it.
If line.Contains("[Store Hours]") Then
OutPutLine.Add(line)
'Need to loop through this 7 times (for each day of the week)
'without reading the header again
Dim aryLabelDay() As String = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"}
For intCount = 0 To 6
'even though we're not using the info from the file, calling _
Readline advances the file pointer so that the next iteration _
of the while loop we can finish reading the file.
If Not sr.EndOfStream Then
line = sr.ReadLine
Dim dymTextNameIn As TextBox = DirectCast(Me.Controls("txt" & aryLabelDay(intCount) & "In"), TextBox)
Dim dymDropNameIn As ComboBox = DirectCast(Me.Controls("drp" & aryLabelDay(intCount) & "In"), ComboBox)
Dim dymTextNameOut As TextBox = DirectCast(Me.Controls("txt" & aryLabelDay(intCount) & "Out"), TextBox)
Dim dymDropNameOut As ComboBox = DirectCast(Me.Controls("drp" & aryLabelDay(intCount) & "Out"), ComboBox)
OutPutLine.Add(dymTextNameIn.Text & "," & dymDropNameIn.Text & "," & dymTextNameOut.Text & "," & dymDropNameOut.Text)
End If
Next
Else
'Any line that isn't in that section gets copied as is.
OutPutLine.Add(line)
End If
End While
'Copy all the new info to the same file overwriting the old info.
File.WriteAllLines(objFileName, OutPutLine)
End Sub
On a side note. The Controls collection is indexed by number or name which makes it fairly simple to access the appropriate control just by knowing its name.
Thanks for the help I actually figured it out and this is the final code I used
Private Sub btnSaveHours_Click(sender As System.Object, e As System.EventArgs) Handles btnSaveHours.Click
Dim intOutPutLine As New List(Of String)()
Dim blnSearchString As Boolean
Dim intLineCount As Integer = -1
Dim intLoopCount As Integer
For Each line As String In System.IO.File.ReadAllLines(objFileName)
blnSearchString = line.Contains("[Store Hours]")
If blnSearchString Then
intLineCount = intOutPutLine.Count
line.Remove(0)
intLoopCount = 0
ElseIf intLineCount = intOutPutLine.Count And intLoopCount < 7 Then
line.Length.ToString()
line.Remove(0)
intLoopCount += 1
Else
intOutPutLine.Add(line)
End If
Next
System.IO.File.WriteAllLines(objFileName, intOutPutLine.ToArray())
Dim objFileWrite As New StreamWriter(objFileName, True)
If File.Exists(objFileName) Then
objFileWrite.WriteLine("[Store Hours]")
Dim varMe As Control = Me
Call subConvertFrom12to24Hours(objFileWrite, varMe)
Else
objFileWrite.WriteLine("[Store Hours]")
Dim varMe As Control = Me
Call subConvertFrom12to24Hours(objFileWrite, varMe)
End If
Call btnClear_Click(sender, e)
End Sub