I have a csv file and I need to get the last line only into seperate textboxes.
Imports System.IO
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
End Sub
Private Sub btnConditions_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnConditions.Click
Using reader As New StreamReader("C:\temp\Apr12log.txt")
Dim line As String = reader.ReadLine()
Dim fields() As String = line.Split(",".ToCharArray())
Dim fileDate = CDate(fields(0))
Dim fileTime = fields(1)
Dim fileTemp = fields(2)
Dim fileHum = fields(3)
Dim fileWindSpeed = fields(4)
Dim fileWindGust = fields(5)
Dim fileWindBearing = fields(6)
While line IsNot Nothing
line = reader.ReadLine()
End While
txtDate.Text = CStr(fileDate)
End Using
End Sub
End Class
It only inputs the first line I am not sure how to get the last line only.
example of txtfile
01/04/12,00:00,5.4,80,3.0,4.5,9.6,261,0.0,0.0,1025.0,1.0,16.8,43,4.0,3.8,5.4,0.0,0,0.0
Alternatively, you could use the System.IO.File ReadLines() function, which gives you an enumerable that you can call Last() on.
Private Sub btnConditions_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnConditions.Click
Dim line As String = System.IO.File.ReadLines("C:\temp\Apr12log.txt").Last()
Dim fields() As String = line.Split(",".ToCharArray())
Dim fileDate = CDate(fields(0))
Dim fileTime = fields(1)
Dim fileTemp = fields(2)
Dim fileHum = fields(3)
Dim fileWindSpeed = fields(4)
Dim fileWindGust = fields(5)
Dim fileWindBearing = fields(6)
txtDate.Text = CStr(fileDate)
End Sub
You're only reading in one line. Instead use ReadToEnd() and then split by a new line, like so:
Dim lines() As String = reader.ReadToEnd().Split(Environment.NewLine)
Then you can move to the last line:
Dim line As String = lines(lines.Length - 1)
You can get what you want with a couple of edits to your existing code:
Shift
While line IsNot Nothing
line = reader.ReadLine()
End While
To just after
Dim line As String = reader.ReadLine()
Add another
Dim line2 As String = Nothing
And insert
line2 = line
Into the While loop, i.e.
While line IsNot Nothing
line2 = line
line = reader.ReadLine()
End While
Now line2 is the last line in the file.
Try this:
Dim lines() As String = File.ReadAllLines("C:\temp\Apr12log.txt")
lastLine = lines(lines.Length - 1)
Related
I need to evaluate each file in a folder for the ICN string. Then add each ICN to an output file. I found the code below and have made changes to it to meet my needs but it only adds one found file in the ICN.log instead of looping through all files.
Private Sub btnFindICN_Click(sender As Object, e As EventArgs) Handles btnFindICN.Click
Dim Regex = New Regex("[<][!]ENTITY (ICN.*?)[.]\w+")
Dim output = New List(Of String)
Dim tLoc = txtFolderPath.Text
Dim txtFiles = Directory.EnumerateFiles(tLoc, "*.xml", SearchOption.AllDirectories)
For Each tFile In txtFiles
Dim input = File.ReadAllText(tFile)
If Regex.IsMatch(input) Then
Console.Write("REGEX found in " + tFile)
output.Add(tFile)
Exit For
End If
Next
File.WriteAllLines(tLoc.TrimEnd("\"c) & "\ICN.log", output)
End Sub
After I removed the for exit for the code works.
Private Sub btnFindICN_Click(sender As Object, e As EventArgs) Handles btnFindICN.Click
Dim Regex = New Regex("[<][!]ENTITY (ICN.*?)[.]\w+")
Dim output = New List(Of String)
Dim tLoc = txtFolderPath.Text
Dim txtFiles = Directory.EnumerateFiles(tLoc, "*.xml", SearchOption.AllDirectories)
For Each tFile In txtFiles
'MsgBox(tFile)
Dim input = File.ReadAllText(tFile)
If Regex.IsMatch(input) Then
Console.Write("REGEX found in " + tFile)
output.Add(tFile)
'Exit For
End If
Next
File.WriteAllLines(tLoc.TrimEnd("\"c) & "\ICN.log", output)
MsgBox("Function Complete")
End Sub
My problem here is that i have 3 radiobuttons for 3 different categories:
Huse Folii and Altele.
The idea is when i select a radiobutton,the filepath will change to Huse,Folii or Altele.
For example i tried to make _path :
Dim _path As String = IO.Path.Combine("C:\Descriere\Huse\")
then use the _path here:
Dim ioFile As New System.IO.StreamReader(_path + "a.txt")
but it didn't worked,for sure i do something wrong,but i can't find how or where to use that _path...
Here is the code:
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
On Error Resume Next
TextBox1.Clear()
If RadioButton1.Checked = True Then
Dim _path As String = IO.Path.Combine("C:\Descriere\Huse\")
End If
If RadioButton2.Checked = True Then
Dim _path As String = IO.Path.Combine("C:\Descriere\Folii\")
End If
If RadioButton3.Checked = True Then
IO.Path.
Dim _path As String = IO.Path.Combine("C:\Descriere\Altele\")
End If
Dim ioFile As New System.IO.StreamReader(_path + "a.txt")
Dim lines As New List(Of String)
Dim rnd As New Random()
Dim line As Integer
While ioFile.Peek <> -1
lines.Add(ioFile.ReadLine())
End While
line = rnd.Next(lines.Count + 1)
TextBox1.AppendText(lines(line).Trim())
ioFile.Close()
ioFile.Dispose()
Dim ioFile2 As New System.IO.StreamReader(path:=+"core.txt")
Dim lines2 As New List(Of String)
Dim rnd2 As New Random()
Dim line2 As Integer
While ioFile2.Peek <> -1
lines2.Add(ioFile2.ReadLine())
End While
line2 = rnd2.Next(lines2.Count + 1)
TextBox1.AppendText(lines2(line2).Trim())
ioFile2.Close()
ioFile2.Dispose()
Dim ioFile3 As New System.IO.StreamReader(path:=+"x.txt")
Dim lines3 As New List(Of String)
Dim rnd3 As New Random()
Dim line3 As Integer
While ioFile3.Peek <> -1
lines3.Add(ioFile3.ReadLine())
End While
line3 = rnd3.Next(lines3.Count + 1)
TextBox1.AppendText(lines3(line3).Trim())
ioFile3.Close()
ioFile3.Dispose()
TextBox1.Text = Replace(TextBox1.Text, "BRAND", TextBox2.Text)
TextBox1.Text = Replace(TextBox1.Text, "MODEL", TextBox3.Text)
Dim count As Integer = 0
count = TextBox1.Text.Split(" ").Length - 1
Label5.Text = "Caractere:" & Len(TextBox1.Text)
End Sub
You are using IO.Path.Combine but you have nothing to Combine at the place of use in your code. You have to use IO.Path.Combine later in your code because this is a method to Combine part of a path and a filename e.g. set your _path first and combine in a second step. Please note this code is not tested for your needs, because your coding is not clear to me.
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim directoryName As String = "D:\"
On Error Resume Next
TextBox1.Clear()
If RadioButton1.Checked = True Then
directoryName = "D:\Descriere\Huse"
End If
If RadioButton2.Checked = True Then
directoryName = "D:\Descriere\Folii"
End If
If RadioButton3.Checked = True Then
'//--- IO.Path.
directoryName = "D:\Descriere\Altele"
End If
Dim ioFile As New System.IO.StreamReader(System.IO.Path.Combine(directoryName, "a.txt"))
...
Dim ioFile2 As New System.IO.StreamReader(System.IO.Path.Combine(directoryName, "core.txt"))
...
Dim ioFile3 As New System.IO.StreamReader(System.IO.Path.Combine(directoryName, "x.txt"))
...
End Sub
Please use the debugger of your IDE because your code isn't clean e.g. a hanging aroung IO.Path.
i want to read text file and from the fifth line take only the first column before (;) this my code to browse and read text :
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim OpenFile As New OpenFileDialog
OpenFile.FileName = ""
OpenFile.Filter = "Fichier Texte (*.pnp)|*.pnp"
OpenFile.ShowDialog()
Try
Dim lire As New System.IO.StreamReader(OpenFile.FileName)
RichTextBox1.Text = lire.ReadToEnd
lire.Close()
Catch ex As Exception
End Try
End Sub
End Class
help me please
You could try something like this:
Dim lineYouWantToRead As Int32 = 5
Dim fieldYouWantToRead As Int32 = 1
Dim capturedValue As String = ""
Using fileReader As New FileIO.TextFieldParser(OpenFile.FileName)
fileReader.TextFieldType = FileIO.FieldType.Delimited
fileReader.SetDelimiters(";")
While fileReader.LineNumber <= lineYouWantToRead - 1
Dim currentLine As String() = fileReader.ReadFields()
capturedValue = currentLine(fieldYouWantToRead - 1)
End While
End Using
RichTextBox1.Text = capturedValue
Let us know if that is any help.
I have multiple .csv files for each month which go like:
01/04/2012,00:00,7.521527,80.90972,4.541667,5.774305,7,281.368
02/04/2012,00:00,8.809029,84.59028,6.451389,5.797918,7,274.0764
03/04/2012,00:00,4.882638,77.86806,1.152778,15.13611,33,127.6389
04/04/2012,00:00,5.600694,50.35417,-3.826389,15.27222,33,40.05556
The format is : Date in the form dd/mm/yy,Current time,Current temperature,Current humidity,Current dewpoint,Current wind speed,Current wind gust,Current wind bearing
The program needs to calculate the average for
temperature
humidity
wind speed
wind direction
and display them on a text box.
any ideas?
Here is what I have done so far...
Option Strict On
Option Explicit On
Imports System.IO
Imports System
Public Class Form1
Private Sub cmb1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmb1.SelectedIndexChanged
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnexit.Click
Me.Close()
End Sub
Private Sub btn1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btndata.Click
'This is for August
If cmb1.SelectedIndex = 1 Then
TextBox1.Clear()
Using reader As New StreamReader("c://temp/DailyAug12log.csv")
Dim line As String = reader.ReadLine()
Dim avgTemp As Integer
Dim fields() As String = line.Split(",".ToCharArray())
Dim fileDate = CDate(fields(0))
Dim fileTime = fields(1)
Dim fileTemp = fields(2)
Dim fileHum = fields(3)
Dim fileWindSpeed = fields(4)
Dim fileWindGust = fields(5)
Dim fileWindBearing = fields(6)
While line IsNot Nothing
counter = counter + 1
line = reader.ReadLine()
End While
avgTemp = CInt(fields(2))
avgTemp = CInt(CDbl(avgTemp / counter))
TextBox1.Text = TextBox1.Text & "Month = August" & vbCrLf & "Temperature Average: " & avgTemp & vbCrLf
End Using
End If
End Sub
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim files() As String
files = Directory.GetFiles("C:\Temp", "*.csv", SearchOption.AllDirectories)
For Each FileName As String In files
cmb1.Items.Add(FileName.Substring(FileName.LastIndexOf("\") + 1, FileName.Length - FileName.LastIndexOf("\") - 1))
Next
End Sub
End Class
Private Class Weather
Public SampleTimeStamp AS Date
Public Temperature AS Double
Public Humidity As Double
Public WindSpeed AS Double
Public WindBearing AS Double
End Class
Sub Main
Dim samples = ReadFile("c://temp/DailyAug12log.csv")
Dim avgTemperature = samples.Average(Function(s) s.Temperature)
...
End Sub
Private Function ReadFile(ByVal fileName as String) AS List(Of Weather)
Dim samples As New List(Of Weather)
Using tfp As new TextFieldParser(filename)
tfp.Delimiters = new String() { "," }
tfp.TextFieldType = FieldType.Delimited
While Not tfp.EndOfData
Dim fields = tfp.ReadFields()
Dim sample As New Weather()
sample.SampleTimeStamp = Date.ParseExact(fields(0) & fields(1), "dd\/MM\/yyyyHH\:mm", CultureInfo.InvariantCulture)
sample.Temperature = Double.Parse(fields(2), CultureInfo.InvariantCulture)
sample.Humidity = Double.Parse(fields(3), CultureInfo.InvariantCulture)
sample.WindSpeed = Double.Parse(fields(4), CultureInfo.InvariantCulture)
sample.WindBearing = Double.Parse(fields(5), CultureInfo.InvariantCulture)
samples.Add(sample)
End While
Return samples
End Using
End Function
I would not use a this aprroach - if the order of the columns changes, your program will show wrong results.
I would use a good csv reader like http://kbcsv.codeplex.com/ and read the Data to a datatable. then you can calculate your resulting columns quite easily and reliablly, because you can adress each column like MyDatatable.Cooumns["Headername"].
I am creating a program that is supposed to write text into a text file, and should be able to read specific lines from a text file in VB (so if i needed to read a specific name I could select line 5 and it would display in the textbox). I am able to read the text from the text file but I do not know how to control a specific line.
Here is my code:
Public Class Form1
Private Sub btnSubmit_Click(sender As System.Object, e As System.EventArgs) Handles btnSubmit.Click
Dim writer As New System.IO.StreamWriter("/text.txt", True)
writer.WriteLine(txtFirstName.Text)
writer.WriteLine(txtLastName.Text)
writer.WriteLine("-------------------------------------")
writer.Close()
End Sub
Private Sub btnRead_Click(sender As System.Object, e As System.EventArgs) Handles btnRead.Click
Dim reader As New System.IO.StreamReader("/text.txt")
Dim FirstName, LastName As String
FirstName = reader.ReadLine()
LastName = reader.ReadLine()
reader.Close()
txtFirstName.Text = FirstName
txtLastName.Text = LastName
End Sub
Private Sub btnClear_Click(sender As System.Object, e As System.EventArgs) Handles btnClear.Click
txtFirstName.Clear()
txtLastName.Clear()
End Sub
End Class
Any help would be appreciated. Thanks!
You will have to read all lines up to the one you're interested in. For example:
Function ReadLineWithNumberFrom(filePath As String, ByVal lineNumber As Integer) As String
Using file As New StreamReader(filePath)
' Skip all preceding lines: '
For i As Integer = 1 To lineNumber - 1
If file.ReadLine() Is Nothing Then
Throw New ArgumentOutOfRangeException("lineNumber")
End If
Next
' Attempt to read the line you're interested in: '
Dim line As String = file.ReadLine()
If line Is Nothing Then
Throw New ArgumentOutOfRangeException("lineNumber")
End If
' Succeded!
Return line
End Using
End Function
This is because lines of text are variable-length records, and there is no way to guess the exact file offset where a specific line begins — not without an index.
If you frequently need to load a specific line, you have some more options:
Load the complete text file into memory, e.g. by using File.ReadAllLines("Foobar.txt"). This returns a String() array which you can access by line number directly.
Create a line number index manually. That is, process a text file line by line, and fill a Dictionary(Of Integer, Integer) as you go. The keys are line numbers, and the values are file offsets. This allows you to .Seek right to the beginning of a specific line without having to keep the whole file in memory.
Try this:
Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
Dim reader As New System.IO.StreamReader("C:\text.txt")
Dim allLines As List(Of String) = New List(Of String)
Do While Not reader.EndOfStream
allLines.Add(reader.ReadLine())
Loop
reader.Close()
txtFirstName.Text = ReadLine(5, allLines)
txtLastName.Text = ReadLine(6, allLines)
End Sub
Public Function ReadLine(lineNumber As Integer, lines As List(Of String)) As String
Return lines(lineNumber - 1)
End Function
If you had a file with this:
Line 1
Line 2
Line 3
Line 4
My Name
My LastName
your name textbox will have 'My Name' and your LastName textbox will have 'My LastName'.
This is very simple, try this:
Dim strLineText As String
Dim intLineNumber As Integer
LineNumber=3
myLine = File.ReadAllLines("D:\text.txt").ElementAt(LineNumber).ToString
Yet another option
Private Function readNthLine(fileAndPath As String, lineNumber As Integer) As String
Dim nthLine As String = Nothing
Dim n As Integer
Try
Using sr As StreamReader = New StreamReader(fileAndPath)
n = 0
Do While (sr.Peek() >= 0) And (n < lineNumber)
sr.ReadLine()
n += 1
Loop
If sr.Peek() >= 0 Then
nthLine = sr.ReadLine()
End If
End Using
Catch ex As Exception
Throw
End Try
Return nthLine
End Function
i tried this and it works fine. using VB Express
content inside test.txt:
line1
line2
1
John
then in the form i add
textbox1
textbox2
label1
label2
and a button.
code inside the button:
Private Sub Button2_Click_1(sender As Object, e As EventArgs) Handles Button2.Click
Dim myLine As String
Dim lineNumber0 As Integer
lineNumber0 = 0
Dim lineNumber1 As Integer
lineNumber1 = 1
Dim lineNumber2 As Integer
lineNumber2 = 2
Dim lineNumber3 As Integer
lineNumber3 = 3
TextBox1.Text=File.ReadAllLines("D:\test.txt").ElementAt(lineNumber0).ToString
TextBox2.Text=File.ReadAllLines("D:\test.txt").ElementAt(lineNumber1).ToString
Label1.Text = File.ReadAllLines("D:\test.txt").ElementAt(lineNumber2).ToString
Label2.Text = File.ReadAllLines("D:\test.txt").ElementAt(lineNumber3).ToString
End Sub
Here's a simple but effective solution:
Dim Reader As String = System.IO.File.ReadAllLines("C:\File.txt")(1)
MsgBox("Line 1: " + Reader)
The MsgBox should show the first line of C:\File.txt.