HI, New to programming with textfiles loops and much more - vb.net

i have a textfile which is in this format
and i am trying to use a stream reader to help me loop each word into a text box, i am new to programming and really need help because all other examples are too complicated for me to understand,
this is what i am trying to do :
Dim objectreader As New StreamReader("filepath")
Dim linereader(1) As String
linereader = Split(objectreader.ReadLine, ",")
For i As Integer = 0 To UBound(linereader)
Spelling_Test.txtSpelling1.Text = linereader(0)
Spelling_Test.txtSpelling2.Text = linereader(0)
Next
but only get the first line of the text file in to a textbox, i need it to loop to the next line so i can write the next line in!
your help would be much appreciated, and if possible then can you show it practically , if you dont understand what i am trying to do then please ask

It is a little confusing on what you are trying to do, it looks like your text file consists of a word and a hint, you only have one set of textbox's and 3 lines of information in your file.
This example show you how to incrementally read your Stream.
Public Class Form1
Dim objectreader As StreamReader
Dim linereader() As String
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
If IsNothing(objectreader) Then
objectreader = New StreamReader("C:\Temp\data.txt")
End If
linereader = Split(objectreader.ReadLine, ",")
If String.IsNullOrEmpty(linereader(0)) Then
objectreader.Close()
objectreader = Nothing
Else
txtSpelling1.Text = linereader(0) 'Word
txtSpelling2.Text = linereader(1) 'Hint
End If
End Sub
End Class
But in your case, I would probably just use the File.ReadAllLines Method
Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Button2.Click
Dim result As String() = File.ReadAllLines("C:\Temp\data.txt")
For x = 0 To UBound(result)
Dim c As Control = Controls.Find("txtSpelling" + (x + 1).ToString, True)(0)
If Not IsNothing(c) Then
c.Text = Split(result(x), ",")(0)
End If
Next
End Sub

Related

Importing data from text file in VB.NET

So, I am trying to develop a book database. I have created a table with 11 columns which populates a DGV, where only 6 columns are showed. The full data of each book is shown in a lower part of the form, where I have textboxes, which are bounded (BindingSource) to the table, that change as I move in the DGV.
Now, what I want to do is to have the posibility to export/import data from a file.
I have accomplished the exporting part with the following code:
Private Sub BtnExport_Click(sender As Object, e As EventArgs) Handles BtnExport.Click
Dim txt As String = String.Empty
For Each row As DataGridViewRow In DbdocsDataGridView.Rows
For Each cell As DataGridViewCell In row.Cells
'Add the Data rows.
txt += CStr(cell.Value & ","c)
Next
'Add new line.
txt += vbCr & vbLf
Next
Dim folderPath As String = "C:\CSV\"
File.WriteAllText(folderPath & "DataGridViewExport.txt", txt)
End Sub
However, I can't manage to import from the txt. What I've tried is this: https://1bestcsharp.blogspot.com/2018/04/vb.net-import-txt-file-text-to-datagridview.html
It works perfectly if you code the table and it populates de DGV without problem. I can't see how should I adapt that code to my need.
Private Sub BtnImport_Click(sender As Object, e As EventArgs) Handles BtnImport.Click
DbdocsDataGridView.DataSource = table
Dim filas() As String
Dim valores() As String
filas = File.ReadAllLines("C:\CSV\DataGridViewExport.txt")
For i As Integer = 0 To filas.Length - 1 Step +1
valores = filas(i).ToString().Split(",")
Dim row(valores.Length - 1) As String
For j As Integer = 0 To valores.Length - 1 Step +1
row(j) = valores(j).Trim()
Next j
table.Rows.Add(row)
Next i
End Sub
That is what I've tried so far, but I always have an exception arising.
Thanks in advance to anyone who can give me an insight about this.
The DataTable class has built-in methods to load/save data from/to XML called ReadXml and WriteXml. Take a look at example which uses the overload to preserve the schema:
Private ReadOnly dataGridViewExportPath As String = IO.Path.Combine("C:\", "CSV", "DataGridViewExport.txt")
Private Sub BtnExport_Click(sender As Object, e As EventArgs) Handles BtnExport.Click
table.WriteXml(path, XmlWriteMode.WriteSchema)
End Sub
Private Sub BtnImport_Click(sender As Object, e As EventArgs) Handles BtnImport.Click
table.ReadXml(path)
End Sub
While users can manually edit the XML file that is generated from WriteXML, I would certainly not suggest it.
This is code which writes to a text file:
speichern means to save.
Note that I use a # in my example for formatting reasons. When reading in again, you can find the # and then you know that and that line is coming...
And I used Private ReadOnly Deu As New System.Globalization.CultureInfo("de-DE") to format the Date into German format, but you can decide yourself if you want that. 🙂
Note that I'm using a FileDialog that I downloaded from Visual Studio's own NuGet package manager.
Private Sub Button_speichern_Click(sender As Object, e As EventArgs) Handles Button_speichern.Click
speichern()
End Sub
Private Sub speichern()
'-------------------------------------------------------------------------------------------------------------
' User can choose where to save the text file and the program will save it .
'-------------------------------------------------------------------------------------------------------------
Dim Path As String
Using SFD1 As New CommonSaveFileDialog
SFD1.Title = "store data in a text file"
SFD1.Filters.Add(New CommonFileDialogFilter("Textdatei", ".txt"))
SFD1.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)
If SFD1.ShowDialog() = CommonFileDialogResult.Ok Then
Path = SFD1.FileName & ".txt"
Else
Return
End If
End Using
Using textfile As System.IO.StreamWriter = My.Computer.FileSystem.OpenTextFileWriter(Path, True, System.Text.Encoding.UTF8)
textfile.WriteLine("Timestamp of this file [dd.mm.yyyy hh:mm:ss]: " & Date.Now.ToString("G", Deu) & NewLine & NewLine) 'supposed to be line break + 2 blank lines :-)
textfile.WriteLine("your text")
textfile.WriteLine("#") 'Marker
textfile.Close()
End Using
End Sub
Private Sub FormMain_FormClosing(sender As Object, e As FormClosingEventArgs) Handles MyBase.FormClosing
speichern()
End Sub
And this is to read from a text file:
'read all Text
Dim RAT() As String = System.IO.File.ReadAllLines(Pfad, System.Text.Encoding.UTF8)
If RAT.Length = 0 Then Return Nothing
For i As Integer = 0 To RAT.Length - 1 Step 1
If RAT(i) = "#" OrElse RAT(i) = "" Then Continue For
'do your work here with (RAT(i))
Next

Getting strings from a textfile in a combobox, vb.net

Here is my code :
I'm trying to have some value out from a TXT file to a combobox or label but i feel combobox would be easier.
here's my code :
please note, some config.txt will only have 1 value while other 5-6
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim IDinFile As String
Dim ID As String
If IO.File.Exists("config.txt") Then
Using StreamReader As New IO.StreamReader("config.txt")
Do
IDinFile = StreamReader.ReadLine
If (IDinFile.IndexOf("7656")) <> -1 Then
ID = IDinFile.Substring(2)
ID = ID.Trim().Remove(ID.Length - 1)
ComboBox1.Items.Add(ID)
Exit Do
End If
Loop Until IDinFile Is Nothing
End Using
End If
End Sub
the file here in .png :
https://i.stack.imgur.com/iYaqP.png
Re-written the code for you. Problem was wrongly placed Exit Do. Also, its advisable to check the line before entering the loop rather than at the end of the loop.
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim IDinFile As String
Dim ID As String
Const FILENAME As String = "config.txt"
If IO.File.Exists(FILENAME) Then
Using StreamReader As New IO.StreamReader(FILENAME)
Do While StreamReader.Peek() >= 0
IDinFile = StreamReader.ReadLine.Trim()
If (IDinFile.IndexOf("7656")) <> -1 Then
ID = IDinFile.Substring(1, IDinFile.Length - 2)
ComboBox1.Items.Add(ID)
End If
Loop
End Using
End If
End Sub
After you add the first item to the combobox you have an Exit Do statement. It no longer continues checking further lines and adding them to the combobox.
You should remove that statement.
Try this. It'll work if the values are organized line by line in the txt file.
Dim srd as New StreamReader("config.txt")
If io.file.exists("config.txt") then
Dim str() = srd.ReadToEnd.split(environment.newline)
For i = 0 to str.count-1
Combobox.item.add(str(i))
Next
srd.close

Visual Basic Sequential Access Files

I've been working on this assignment for quite awhile, but I'm practically ripping my hair out. Before anyone jumps the gun and says I'm looking for a free handout on the assignment, please note, I've done 90% of the assignment! The program has 4 commercials in a list, you choose which one to vote for and it saves your vote and tallies it. As it tallies it in the program, it also saves it into a file. The next time you open the file, you can hit "Display vote" and it reads the file and re-tally's everything for the user.
Here's what the program looks like, at least what I have done. My issue is that when I hit display votes, nothing happens. It doesn't read in anything from the file. I tested using a message box for it to see if it displays anything from the file, and it does infact display the first item from the project. Anyone have any ideas?!
Public Class frmMain
Dim intVotes(3) As Integer
Private Sub frmMain_Load(sender As Object, e As EventArgs) Handles MyBase.Load
lstCom.Items.Add("Budweiser")
lstCom.Items.Add("FedEx")
lstCom.Items.Add("E*Trade")
lstCom.Items.Add("Pepsi")
lstCom.SelectedIndex = 0
End Sub
Private Sub btnSaveVote_Click(sender As Object, e As EventArgs) Handles btnSaveVote.Click
Dim outFile As IO.StreamWriter
Dim intSub As Integer
intSub = lstCom.SelectedIndex
If intSub <= intVotes.GetUpperBound(0) Then
intVotes(intSub) += 1
If IO.File.Exists("CallerVotes.txt") Then
outFile = IO.File.CreateText("CallerVotes.txt")
If lstCom.SelectedIndex = 0 Then
outFile.WriteLine("Budweiser")
ElseIf lstCom.SelectedIndex = 1 Then
outFile.WriteLine("FedEx")
ElseIf lstCom.SelectedIndex = 2 Then
outFile.WriteLine("E*TRADE")
ElseIf lstCom.SelectedIndex = 3 Then
outFile.WriteLine("Pepsi")
End If
outFile.Close()
End If
End If
lblBud.Text = intVotes(0).ToString
lblFed.Text = intVotes(1).ToString
lblET.Text = intVotes(2).ToString
lblPep.Text = intVotes(3).ToString
End Sub
Private Sub ListBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles lstCom.SelectedIndexChanged
End Sub
Private Sub btnExit_Click(sender As Object, e As EventArgs) Handles btnExit.Click
Me.Close()
End Sub
Private Sub btnDisplayVote_Click(sender As Object, e As EventArgs) Handles btnDisplayVote.Click
Dim inFile As IO.StreamReader
Dim strText As String
If IO.File.Exists("CallerVotes.txt") Then
inFile = IO.File.OpenText("CallerVotes.txt")
Do Until inFile.Peek = -1
strText = inFile.ReadLine
If strText = "Budweiser" Then
intVotes(0) += 1
ElseIf strText = "FedEx" Then
intVotes(1) += 1
ElseIf strText = "E*TRADE" Then
intVotes(2) += 1
ElseIf strText = "Pepsi" Then
intVotes(3) += 1
End If
Loop
inFile.Close()
End If
End Sub
End Class
If you look at your file I think you will see that you have only one entry. You are overwriting the file each time you click the save button by using the CreateText method.
from MSDN(emphasis mine)
This method is equivalent to the StreamWriter(String, Boolean) constructor overload with the append parameter set to false. If the file specified by path does not exist, it is created. If the file does exist, its contents are overwritten.
try using the AppendText method instead.
i.e.
If IO.File.Exists("CallerVotes.txt") Then
outFile = IO.File.AppendText("CallerVotes.txt")
You will also need to assign the values that you read in to the appropriate labels per DeanOC's answer.
I think that your problem is that you are not assigning the values from the intVotes array to the labels. At the end of btnDisplayVote_Click try adding
lblBud.Text = intVotes(0).ToString
lblFed.Text = intVotes(1).ToString
lblET.Text = intVotes(2).ToString
lblPep.Text = intVotes(3).ToString

Back button in a vb.net program

I am trying to write the code for a back button in my VB.NET app. But it is not working. What is wrong with it?
Private Sub BackBtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BackBtn.Click
Dim returntext As String = Clipboard.GetText()
lblDictword.Text = returntext
Dim returnHtmlText As String = Nothing
If (Clipboard.ContainsText(TextDataFormat.UnicodeText)) Then
returnHtmlText = Clipboard.GetText(TextDataFormat.UnicodeText)
'Clipboard.SetText(replacementHtmlText, TextDataFormat.Html)
Clipboard.SetText(returnHtmlText, TextDataFormat.UnicodeText)
End If
lblDictword.Text = returnHtmlText
'Return returnHtmlText
Dim count As Integer = myStrings.Length
If count > 1 Then
Dim s As String = myStrings.ElementAt(count - xd)
xd = Array.IndexOf(myStrings, s)
lblDictword.Text = s
End If
End Sub
I am not an VB.NET expert, but usually getting access to clipboard isn't as easy as it looks. Check this:
Problem with clipboard class
It can be only a tip, not really solution. Look into your clipboard functionallity

Extracting specific lines from one text file to other text file

I want to extract some specific lines from a text file to other text file. i am using the following code
Imports System.IO
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim Tr As IO.TextReader = System.IO.File.OpenText("C:\Assignment.txt")
For c As Integer = 1 To 10
If c = 7 Then
Dim MyFileLine As String = Split(Tr.ReadToEnd(), vbCrLf)(c) & vbCrLf
Tr.Close()
Dim TW As System.IO.TextWriter
'Create a Text file and load it into the TextWriter
TW = System.IO.File.CreateText("C:\Assignment1.txt")
TW.WriteLine(MyFileLine)
'Flush the text to the file
TW.Flush()
'Close the File
TW.Close()
End If
Next c
End Sub
End Class
But this code extract only the line no 7 where i want to extract the 8th,9th,10th,14th,15th,16th, lines also . Please guide me the right solution. Thank u in advance.
There seems to be several issues here. I will correct them and then explain below:
Imports System.IO
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim currentLine As String
Dim lineCounter As Integer = 1
Dim lineNumbersRequired As List(Of Integer) = New List(Of Integer)
lineNumbersRequired.Add(7)
lineNumbersRequired.Add(8)
lineNumbersRequired.Add(9)
lineNumbersRequired.Add(10)
lineNumbersRequired.Add(14)
lineNumbersRequired.Add(15)
lineNumbersRequired.Add(16)
Dim TW As System.IO.TextWriter
'Create a Text file and load it into the TextWriter
TW = System.IO.File.CreateText("C:\Assignment1.txt")
Using Tr As IO.TextReader = New IO.StreamReader("C:\Assignment.txt")
While Not Tr.EndOfStream
If lineNumbersRequired.Contains(lineCounter) Then
Dim MyFileLine As String = Split(currentLine, vbCrLf)(c) & vbCrLf
TW.WriteLine(MyFileLine)
End If
lineCounter = lineCounter + 1
End While
End Using
TW.Flush()
'Close the File
TW.Close()
End Sub
End Class
NOTE: Code not tested, but should be pretty close if you do get a few compile errors!
Ok then, just a quick rundown of what I did here:
Changed the For Loop into a while because you had the for loop running from 1 To 10, so even if it worked, then you would have never read past the 10th line in your file. So I have changed it to a while loop that will end when the TextReader has read all lines in the file. Also the current line read from the file has been added to a new variable called currentLine.
The new currentLine variable is now used to populate the lines of your writing file.
I have added a list of Integers that will hold the line numbers you want to keep, then within the while loop I have a counter that counts each line as it is processed and if this counter is inside the list of line numbers you want to save into your output file, then it will output the current line.
Let me know how you get on, and if you need more of an explanation on any of it then please ask.