Visual Basic

modify a Variable in a specific line in a text file

24-Nov-09 14:42

PAguilar09 wrote:
im guessing
since it is a masked box?

Guessing isn't very professional. How about studying, researching and trying?

Maybe like so[^].

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

IvanIT24-Nov-09 7:14

Re: modify a Variable in a specific line in a text file

24-Nov-09 7:14

I am working with a textfile; the content of which I have read into a multiline textbox. The number of lines in my textfile will vary from time to time, but I know that the line that I want to modify is always 3rd from the bottom.
for eg.
SM*82*000102339~

my intent is to read the file and modify the 82 to a variable nuCount.

My first thought is to write to an Array and do something. I am stuck. can anyone help me out and put me back on the right track? Thanks

Dave Kreskowiak24-Nov-09 7:25

Re: modify a Variable in a specific line in a text file

24-Nov-09 7:25

So, you read the entire contents into an array of Strings, then find the line you want and do some very simple string manipulation. What's the problem? You're stuck on what part of this??

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But no longer in 2009...

EliottA24-Nov-09 7:56

EliottA

24-Nov-09 7:56

I'd think he's stuck on the string manipulation bit..

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Re: modify a Variable in a specific line in a text file

Dave Kreskowiak24-Nov-09 9:40

Re: modify a Variable in a specific line in a text file

24-Nov-09 9:40

Nothing a little RegEx couldn't easily handle...

If that's his problem. I wasn't too sure after reading his post a few times.

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Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

Luc Pattyn24-Nov-09 10:39

Re: modify a Variable in a specific line in a text file [modified]

24-Nov-09 10:39

How about this:
- forget the multiline TextBox, use a single-line TextBox instead;
- use File.ReadAllLines to get a string array;
- set an integer variable "index" equal to the array length minus 3;
- show the relevant line in the TextBox by setting its Text property;
- have the user edit it and indicate he is done somehow (a "Save" Button would be fine)
- store the TextBox.Text into the same array position you used before;
- and now call the right File method.

Of course if you know exactly what modification has to be applied, you don't need the TextBox at all and you can have your code do it for you.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

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IvanIT25-Nov-09 3:30

Re: modify a Variable in a specific line in a text file

25-Nov-09 3:30

Luc, thank you for your suggestion. I think I am going to run with it and then repost the solution here. Gracias.

modified on Wednesday, November 25, 2009 12:24 PM

IvanIT25-Nov-09 6:26

Re: modify a Variable in a specific line in a text file

25-Nov-09 6:26

Still need some help here ..

As Luc suggested, I am using the code below to read a single line to my Textbox. That is working fine. My issue is that I get the last line in the textfile; my solution is to get the 3rd line from the bottom. How do I modify my code to achieve that? Thanks

Dim myFile As New System.IO.StreamReader(frmMain.lblClaimsFile.Text)<br />
Dim strTextArray() As String = {}<br />
Dim intIndex As Integer = 0<br />
<br />
Do Until myFile.EndOfStream = True<br />
ReDim Preserve strTextArray(intIndex)<br />
strTextArray(intIndex) = myFile.ReadLine()<br />
intIndex += 1<br />
Loop<br />
<br />
For i As Integer = 0 To UBound(strTextArray)<br />
txtSEloop.Text = strTextArray(i)<br />
'how do i read the 3rd line from bottom of file?<br />
Next

Luc Pattyn25-Nov-09 6:28

Re: modify a Variable in a specific line in a text file

25-Nov-09 6:28

Then I suggest you read my earlier message again, up to and including my sig. Laugh | :laugh:

Luc Pattyn [Forum Guidelines] [My Articles]

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IvanIT30-Nov-09 5:24

Re: modify a Variable in a specific line in a text file

30-Nov-09 5:24

Luc, I am a little slow, but I am getting there! lol! the code below gives desired result.

lblNumTrans.Text = frmMain.transLoop<br />
<br />
        Dim myFile As New System.IO.StreamReader(frmMain.lblClaimsFile.Text)<br />
        Dim strTextArray() As String = {}<br />
        Dim intIndex As Integer = 0<br />
<br />
        Do Until myFile.EndOfStream = True<br />
            ReDim Preserve strTextArray(intIndex)<br />
            strTextArray(intIndex) = myFile.ReadLine()<br />
            intIndex += 1<br />
        Loop<br />
<br />
        'read the 3rd line from bottom of file?<br />
        For i As Integer = 0 To strTextArray.Length - 3<br />
<br />
            txtSEloop.Text = strTextArray(i)<br />
<br />
        Next

The last piece I have not yet figured out is how to save what is displayed in my textbox back to the original text file. My issue is that I have the file open for reading. Any help? thanks

Luc Pattyn30-Nov-09 5:38

30-Nov-09 5:38

If you were to take my initial advice a quarter of the amount of code shown would have solved it all.

The code you currently have is lacking error handling, it doesn't close files and streams, has two loops it doesn't need, and is not complete. I would waste it.

Smile | :)

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Erasing GraphicsPath

O.G.I.24-Nov-09 4:26

O.G.I.

24-Nov-09 4:26

Hi everybody
I'm currently developing a 2D RPG game like diablo 2. And this year I finally finished the physics engine Smile | :)

.
For drawing the objects I use GDI+. Now I'm working on the level editor and I want to give more freedom for the level designers like giving them the option to decide by their own which regions of the map shall be impassable. The point is to give them a pen tool which they can use to freehand draw the impassable regions - something like Microsoft inkball game(http://www.windowsvistauserguide.com/vista2/games/inkball3.JPG) where you draw a line and when the ball touches the line it bouns from it. For that pen tool I use System.Drawing.Drawing2D.GraphicsPath function - the problem I have is that I don't know how to provide to the level designer a tool for erasing the created impassable regions - do you know a way to erase part of graphic created with System.Drawing.Drawing2D.GraphicsPath function? I've read an article where you can "erase" the created line by drawing another one with the same background color as the containing control but it just didn't work in my case because for background I don't have a solid color but a complex bitmap texture and objects like units and buildings.
Please help, thank you in advance and sorry for my bad english.

Re: Erasing GraphicsPath

Dave Kreskowiak24-Nov-09 7:24

Count lines in Textfile after Insert

24-Nov-09 7:24

It doesn't sound like you have much of a choice but to repaint everything except the portions you're removing.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

IvanIT24-Nov-09 2:28

24-Nov-09 2:28

I have a block of code like so; I use to get the number of lines in a text file once I load it in a multiline textbox on my Form1.

Private Sub countLinesToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles countLinesToolStripMenuItem.Click<br />
        ''count claims between ST & SE segments<br />
        Dim totLines As String() = IO.File.ReadAllLines(Me.lblClaimsFile.Text)<br />
<br />
        MessageBox.Show("The file had " & totLines.Length & " lines before processing.")<br />
    End Sub

Once this file is loaded, I do some manipulations, including inserting additional lines. I would like some codes to determine the total number of lines in the textfile after the manipulation.

I am using stringbuilder to load file contents.

Dim newString As New StringBuilder<br />
        newString.Append(My.Computer.FileSystem.ReadAllText(FileName))

TIA.

dan!sh 24-Nov-09 3:03

dan!sh

24-Nov-09 3:03

As you said, you have a multiline text box to load the file. I assume you are editing the file text there itself. Hene if you get the lines count in the multiline text box, I suppose it will be same as that in the file.

50-50-90 rule: Anytime I have a 50-50 chance of getting something right, there's a 90% probability I'll get it wrong...!!

IvanIT24-Nov-09 3:07

24-Nov-09 3:07

The line count I get on load is static. After inserting additional lines in the file, I need a way to get a dynamic update of the number of lines in the "modified" file. Sorry if this was not clear. thanks

Dave Kreskowiak24-Nov-09 3:45

24-Nov-09 3:45

Have you looked at the Lines property of the TextBox control?

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

IvanIT24-Nov-09 4:01

24-Nov-09 4:01

Thanks Dave. I will give it a whirl.

Shameel24-Nov-09 4:17

Shameel

24-Nov-09 4:17

If you want to find out the number of lines in the textbox, use:

int lineCount = textBox1.Lines.Count;

IvanIT24-Nov-09 4:41

24-Nov-09 4:41

Thanks Shameel .. it worked great; I just had to use Length instead of Count (since I got a message that count was not in the array).

Dim lineCount As String<br />
            lineCount = txtClaimsDetail.Lines.Length<br />
            MessageBox.Show("You have " & lineCount & " in your batch")