[RESOLVED] [2008] Reading from a txt file

Hello everyone, I'm writing a little application that is supposed to fetch account information from a txt file, the format is going to be

account pw
account pw
account pw

And this information should be stored into 2 different arrays, UserAcc(string) and UserPw(string). I have already written the script for determining the size of the arrays.

But how would I go about reading and storing the account and password information into the right variables?

Homework? I'd be looking at the streamreader and streamwriter classes.

Quote:

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Originally Posted by PENNYSTOCK

Homework? I'd be looking at the streamreader and streamwriter classes.

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I've done that, but the thing is I know how to set the size of the arrays counting the amount of lines with streamreader, but I don't know how to go about dividing the lines into two different variables based on acc/pw

You could fill up a listbox and try something like this:

Code:

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Dim i as integer = 0 to list.items.count-1
UserAcc (i) = leftof (list.items.item(i), " ")
userpw(i) = rightof (lst.items.item(i),useracc(i) & " ")

Public Function LeftOf(ByVal SearchIn As String, ByVal StartLeft As String) As String
        LeftOf = strings.Replace(SearchIn, strings.Right(SearchIn, Len(SearchIn) - Val(InStr(1, SearchIn, StartLeft)) + 1), vbnullstring)
End Function

Public Function RightOf(ByVal SearchIn as string, Byval startleft as string)as string
        RightOf = strings.Right(SearchIn, Len(SearchIn) - (Val(InStr(1, SearchIn, StartRight)) + Len(StartRight)))
end function

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I'd use the readline into a string, and use string.split(" ") to get the two halves.

That probably works best.

Quote:

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Originally Posted by PENNYSTOCK

I'd use the readline into a string, and use string.split(" ") to get the two halves.

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What exactly does String.split do though? I need to make sure that they are placed in their respective variables

Code:

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Dim theArray() As String
    theArray = String.Split("user pass", " ")
    For i As Integer= LBound(theArray) To UBound(theArray)
    Debug.Print theArray(i)
    Next i

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Code:

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Private Sub Command1_Click()
Dim theArray() As String
    theArray = String.Split("user pass", " ")
    For i As Integer= LBound(theArray) To UBound(theArray)
        If IsOdd(i) = False Then Debug.Print theArray(i) & " - user"
        If IsOdd(i) = True Then Debug.Print theArray(i) & " - pass"
    Next i
End Sub

Function IsOdd(ByVal lngTheNumber As Long) As Boolean
    IsOdd = IIf((lngTheNumber Mod 2) = 0, False, True)
End Function

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Actually I'm getting error if I try to use string split..

Here's my current code

Code:

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    Private Sub LoadAccs_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles LoadAccs.Click

        OpenFileDialog1.ShowDialog()
        Dim FILE_NAME As String
        FILE_NAME = OpenFileDialog1.FileName

        Dim TextLine As String
        Dim objReader As New System.IO.StreamReader(FILE_NAME)
        Dim i As Integer
        Dim splitter As String

        If System.IO.File.Exists(OpenFileDialog1.FileName) = True Then

            Do While objReader.Peek() <> -1
                TextLine = objReader.ReadLine() & vbNewLine
                splitter = objReader.ReadLine().ToString()
                splitter.Split("user pw", " ")
                Count = +1
                i = +1
            Loop

        Else

            MsgBox("File Does Not Exist")

        End If

        objReader.Close()


    End Sub

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if you have already correctly specified the size of the arrays for your password and user account info then this should work (it's based on the assumption that there's a space between the 2 pieces of info so that's the character that you will be splitting by):

vb Code:

Dim FILE_NAME As String = String.Empty
Dim tempArray() As String
Dim i As Integer = 0
 
        If OpenFileDialog1.ShowDialog() = Windows.Forms.DialogResult.OK Then
            FILE_NAME = OpenFileDialog1.FileName
 
            Using objReader As New System.IO.StreamReader(FILE_NAME)
                Do While objReader.Peek() <> -1
                    tempArray = objReader.ReadLine.Trim.Split(" "c)  'Split using space char to get info
                    UserAcc(i) = tempArray(0)
                    UserPw(i) = tempArray(1)
                    tempArray = Nothing
                    i += 1
                Loop
            End Using
        End If

Well thanks for the help, here is the finished code. But I'm getting errors when I try to load the accounts, any ideas what might be wrong?

vb Code:

Private Function ModCount()
 
        If Count Mod 2 = 0 Then
            ModCount = Count
        Else
            ModCount = Count + 1
        End If
 
        Return ModCount / 2 ' divide by two because the values are seperated into two different variables
 
    End Function
 
    Public Sub LoadAccs_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles LoadAccs.Click
 
        Dim FILE_NAME As String = String.Empty
        Dim TempArray() As String
        Dim i As Integer = 1
        Dim Templine() As String
        Dim TextLine As String
 
        If OpenFileDialog1.ShowDialog() = Windows.Forms.DialogResult.OK Then ' If file exists, then go on
            FILE_NAME = OpenFileDialog1.FileName
 
            Using objReader As New System.IO.StreamReader(FILE_NAME) ' Here it's time to count the number of lines
                Do While objReader.Peek() <> -1 ' To set the size of the array
                    StatLabel.Text = ("Loading accounts...")
                    Templine(i) = objReader.ReadLine
                    Count = +1
                    i += 1
                    TextLine = TextLine & objReader.ReadLine() & vbNewLine
                Loop
 
                Dim NPuser(ModCount()) As String ' Here we make sure the arrays aren't too big, using Modcount
                Dim NPpw(ModCount()) As String
                StatLabel.Text = (Str(Count) & " Account(s) detected")
                i = 1
 
                For i = 1 To ModCount()
                    TempArray = Templine(i).Trim.Split("/"c)  'Split using space char to get info
                    NPuser(i) = TempArray(0) ' Assign user with the first splitted values, the accounts
                    NPpw(i) = TempArray(1) ' And then the passwords
                    TempArray = Nothing 'Emtpy
                    StatLabel.Text = ("Loaded account" & NPuser(i))
                Next i
            End Using
 
        End If

Quote:

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But I'm getting errors when I try to load the accounts, any ideas what might be wrong?

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How about you actually tell us what the errors are and then we might be able to tell you what the problem is...

Although i'm guessing one of the reasons is because you aren't specifying the bounds of the arrays and then trying to add elements to the array.

In your first use of the StreamReader you have these two lines. Each time you use .ReadLine it will do just that

vb Code:

Templine(i) = objReader.ReadLine
 
TextLine = TextLine & objReader.ReadLine() & vbNewLine

So for each 'loop' you read two lines. Are you sure this is what you want to do?

I have no idea what the point of TextLine is.

You would really be better off just writing this to fill your array:

vb Code:

Dim tempLine() As String = IO.File.ReadAllLines(FILE_NAME)

Then specify the bounds like this:

vb Code:

Dim NPuser(tempLine.Length - 1) As String
Dim NPpw(tempLine.Length - 1) As String

and finally just loop through you tempArray

vb Code:

For i = 1 To tempArray.GetUpperbound(0)

There's no need for all the Mod crap.

The error is unhandled expception, object reference not set to an instance of an object.

Okay, I'm fairly close now after experimenting awhile, everything runs fine, but out of some weird reason it fetches one line too much. For example if I want to print out NPpw(2) it would print out test3 (from the third line)

Here's my code

vb Code:

Dim FILE_NAME As String = String.Empty
        Dim TempArray() As String
        Dim i As Integer = 1
 
        If OpenFileDialog1.ShowDialog() = Windows.Forms.DialogResult.OK Then ' If file exists, then go on
            FILE_NAME = OpenFileDialog1.FileName
        End If
 
        Dim tempLine() As String = IO.File.ReadAllLines(FILE_NAME)
        Dim NPuser(tempLine.Length - 1) As String
        Dim NPpw(tempLine.Length - 1) As String
 
        For i = 1 To tempLine.GetUpperBound(0)
            TempArray = tempLine(i).Trim.Split("/"c)
            NPuser(i) = TempArray(0)
            NPpw(i) = TempArray(1)
            TempArray = Nothing
        Next i
 
        MsgBox(NPuser(2) & " " & NPpw(2))
 
 
    End Sub

Okay I kind of realized the reason for this happening, and it's because the first line is stored in (0), but yeah.. is there any way to fix this? So that the lines are stored in the correct order

The lines are in the correct order and as you said is because arrays are zero based.

Why can't you just use it as it is, it's perfectly fine.

Otherwise you will have to create an array with an extra space and then always have a completely empty element in your array which to me is just unnecessary.

Setting i to 1 in the loop will mean you will obviously lose the 1st line of your text file as it will be in the 0 position in the array

Quote:

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Originally Posted by stimbo

The lines are in the correct order and as you said is because arrays are zero based.

Why can't you just use it as it is, it's perfectly fine.

Otherwise you will have to create an array with an extra space and then always have a completely empty element in your array which to me is just unnecessary.

Setting i to 1 in the loop will mean you will obviously lose the 1st line of your text file as it will be in the 0 position in the array

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Yeah I actually fixed that, I just didn't bother updating the code here. Anyhow I'll mark this as resolved now thanks for all the help