Im trying to truncate lines in a .txt file from 19chars to 13chars. Then copy the .txt file to another location and rename the extension to .lst. As below... Iam having issue with getting it to write the truncated number to the new txt file. Its some how returning a Null referance & i cant work out why??
Imports System.IO
Public Class Form1
Sub ProcessFile(ByVal SourceFile As String, ByVal DestFile As String)
[code].....
I have an VB.NET app that writes the status to a log file in text format. Over time, the file is getting large and I wanted to know if there is an efficient way to truncate the beginning of the file.
To make things easier, I am looking to specify a file size (say 2-3 mb) and I am writing the log using a StreamWriter:
Using strm As New IO.StreamWriter(filelocation.log, True)
strm.WriteLine("msg to write")
strm.Close()
End Using
I thought about using the strm.BaseStream.Length to determine how much of the file to cut off, but by using the .SetLength it would cut from the end - not the desired result.
The RX data from the serial port is as follows:
FE FE FA E0 00 23 45 FD
I need to truncate everything else and just have positions 5, 6 and 7 output in the hex in a TEXTBOX. See below:
452300
Instead it will put the the whole steam in the textbox and it will be in decimal format, not hex.
I need to read lines from file. Now my code is like this:
Sub data()
Dim reader As New IO.StreamReader("log.txt")
For i = 0 To 1500
date(i) = reader.ReadLine
Next i
End Sub
Now if some user will change add or remove the data from this file, it will end up with error or sth. I also tried to write sth like this:
Open "C:in.txt" For Input As intInFile
But there appears an error, that open is not declared and IO functionality is microsoft.visualbasic namespace. I added this name space (at the top: Imports Microsoft.VisualBasic), but this error still occurs.
I have a windows form with a textbox and a button, what I am trying to do is enter a number in the textbox and when clicked on the button to cut and paste the data in to a new text file (from number 0 to the number I entered).ie, textfile 1 has 100 lines of data, I enter 25 and press OK I would like to take the first 25 lines and save them into a new text file and save the remaining lines in textfile 1 so it should be like textfile1 75 lines and textfile2 25 lines.The closest I've come to this is the following but this only deletes the one line..[code]
View 3 RepliesI am trying to make a script to spit command lines to a bat file to compress a bunch of files singly and then delete the original ones. I am sure that is easy to most of you, but I living a ____ trying to do this. A have a file list like this one belo, which was created with a command -- Dir /b /s /a-D N: > filelist.txt
[Code]...
read lines in a file, split the lines and spit the result to another file
View 2 RepliesI want to put a function that reads a text file and put it in textbox1. I used this code to read the last line
Textbox1.text = Io.file.readalllines("C:c.txt").last
but I want it to read the third line.
I want to create a little program with textboxes in it, that writes the contents of these textboxes to a file. It also needs to write some predefined lines to the files, even on the same line as where the contents of the textbox is.
Heres an example:
The file should look like this when you open it in notepad:
^1::
Send t Text from TextBox {Enter}
First I think I would need to do this:
Dim ioFile As New StreamWriter("scripting.ahk")
ioFile.WriteLine("^1::")
If I do the above it works.. But how can I write another line where the "Send t" and "{Enter}" gets written automaticly before and after the contents from the Textbox?
I have a text file with user names in them on separate lines. I want to check to see if any of the lines doesn't match the exact text im checking for. It doesn't matter what line the text is on, as long as it is in there. If it's not, alert me. Previously i tried .contains() but obviously if a user name is "hello" and another's is "helloworld" it will match both of them.So basically i need to read all the lines in the txt file and if none of them lines contains the specific text im looking for then alert me. [code]
View 5 RepliesI have the following code to read a csv file and copy each line to another file as long as it does not contain certain strings, it seems to work a little but it leaves some lines in it shouldn't, and it's also taking lines out it shouldn't as if I keep running it again on each output file it eventually takes everything out!
Private Sub Strip_File()
Microsoft.VisualBasic.FileOpen(1, tFile.Text, OpenMode.Input, OpenAccess.Read)
Microsoft.VisualBasic.FileOpen(2, "C:AcmeIPPMaster.csv", OpenMode.Append, OpenAccess.ReadWrite)
[Code]....
Here's what i've got so far, i've written all of the data that i'm going to put into my config file, however i'm having trouble reading the specific string values that I need from that ini file. The parts of the ini lines I want to get are the values in between the I've tried using streamreader a couple things but i'm having trouble figuring that out. I need to parse each line of the ini file to get that value in between the single quotations, so that I can set the value for my richtextbox background and text color as well as a few other things that i've set up in my notepad including tab spacing and so on. lots of these different values need to be converted from a string value to integers, and boolean values as well. (4 of them, the rest of them don't have to be changed because they are already string values when my application reads them to determine it's application load settings.
EDIT: I just noticed in the preview that this is from the version of the app where I had streamwriter write "______ value=" & Something to a file. lol some of the (')s are still in this version, so please excuse that little part. I had them in, but took them out so that I could trim data to get a value easier, but I want to use (')s hopefully when all is said and done.For example, just to restate what I want - in the ini file it will read [setting name] value='VALUE'I want to be able to "get" the string value of "VALUE" within the ini file between the 2 single quotations '
I'm working on a new version of something I had created years ago in VB6. What I was doing then is populating a combobox with lines from a sequential file ("title","URL") like this:
Open "data.dat" For Input As #1
Do While Not (EOF(1))
Input #1, NameInput, URLInput
cmbEntry.AddItem NameInput
Loop
And then checking against it on a button click to load the URL associated with the selected name:
Open "data.dat" For Input As #2
Do While (cmbEntry.Text <> NameInput) And (Not (EOF(2)))
Input #2, NameInput, URLInput
Loop
[Code] .....
What I'm trying to do in Visual Basic 2010 is the same process, though I'll be including a third field ("category","title","URL") to determine which one of four different comboboxes I add the entry to. I know I need to use streamreader, but I'm not finding much in the way of documentation or examples on how to do what I'm trying to do, which is:
- Populate one of four comboboxes with the second value in each line of an external text file, based on the first value in that line
- Set a string to the third value in a line of an external text file, based on the second value of that line
How to read these values from the file.
I'm new here and I'm trying to make a little program with Visual Basic (2010 Express Edition).The purpose of this program is:
1) Load the text file lines and split them into a constant and a value
2) Edit the text file lines values
The content of the text file is like this:
[Code]...
This basically split every lines in two parts: the constant ("Name", "Surname", "Age", "Hair") and the values ("Mario", "Rossi", "50", "Black").Now about the second point, I've added a Button1 which should take the Textbox1/2.Text and the Combobox1 selected item and replace the values(aka separator(1)) in the text file. The problem is I don't have any idea at the moment how to do it. What method should I use?
As you will see from the code below I need to be able to tell before the array runs how many members of the array there are or else the program will crash. How can I redim the array depending on how many lines are in the text file (RECORDS.txt)
Imports System.IO
Public Class Form1
Structure Nation
Dim name As String
Dim continent As String
[Code] .....
As you will see from the code below I need to be able to tell before the arrayruns how many members of the array there are or else the program will crash. How can I redim the array depending on how many lines are in the text file (RECORDS.txt
Imports System.IO
Public Class Form1
Structure Nation
[code]......
I am reading from a textfile. How can I skip a line if it's empty?
Or is it possible to delete at the beginning of ReadAllLines to remove this empy lines.
An empty line would be following:
text1
text2
"empty line"
text3
[Code]....
I have written a simple script to get a bunch of lines from a text file (they will be filenames eventually) which are split by new lines and puts each one into an array..
Dim ary() As String
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If My.Computer.FileSystem.FileExists("C:MenuFiles.txt") Then
[code]....
The only thing I can do for now is either use the substring function to remove the first character from all array values after 0 but I don't like that because it's messy and what if the split "works" as I want it to one one of the lines and knocks of the first character when I don't want it to.
below are a few lines from my text file(10929 lines)I need to read each line and insert into MS Access. each line is a column in my table and the record changes on every 8th line or to be more specific(on every 8th line you will see a number [1,2,3,4,5,6,7,8,9.....] this is where another record starts,
[Code]...
I have a text file containing lines of data (File 1). I need to delete all the lines in another text file (File 2), which are found in file 1.So I could read file 2 line by line. And then once the line has been read, read file 1 line by line to search for a match. But that's going to be painfully slow.Or I could read file 2 into memory. And then read file 1 line by line and REPLACE the lines in file 2 with nothing, therefore deleting them. File 2 could be 100 mb, so I'm not sure about reading it all into memory.
View 16 Replies[TEX]Hello[/TEX] How do i use truncate in vb 2008?my database its in Access and i want to implement a truncate table in vb but i don't know how to do it.
View 1 Repliesis there a simple way to truncate an array ? Something like placing an end characted in the array which would signify its end ?
Basically I have two arrays of slightly different sizes and I want to shorten them so they both have the same size. The end data I am truncating I don't need.
how to truncate my string value to 17 characters only.
in my program, the acceptable number of characters for First Name is 17. Characters more than 17 should be truncated but it may cut words in the middle. I need to make the length max 17 characters, but, if it cuts a word, it should also remove this half-word completely.
I've been using it and even saw a method in a MSDN search given that suggests that it should be used but have found that there are defects using it. An example of problem occurring.
Dim db As Double
db = Int(10.12 * 100) / 100
db should be equal to 10.12 but the result you get will be 10.11. In the above example nothing is being truncated. If you added some digits right of the 2 it would give a good result. But if you're using a variable and it sometimes is equal to 10.12 or 9.12 etc. then a problem would occur. Also if 10.12 was replaced with 10.03 you'd get a result of 10.02. 10.04 gives a result of 10.03. 10.2 gives a result of 10.19. I'm now using code such as what is seen below instead of using Int() :
bd = Decimal.Truncate(CDec(10.12 * 100)) / 100
You could declare bd as a Decimal and then you wouldn't have to use CDec(). If I try Int(1012) the result is 1012 but Int(10.12 * 100) will give 1011. Pretty weird in my opinion.
How can I "truncate" a DateTime variable so that only e.g. the current minute remains?
Like in:
Dim myDateTime As DateTime
myDateTime = Now
.... (what would have to come here)
If Now is e.g. 15:43:21 then leave only 15:43:00 in the variable?
I've been trying to find a solution to this problem all morning.This is what I have: 1 comboBox control,autofilled from SQL table [code]...
View 6 Replieswell i am truing 2 make a button when i click it would truncate the data in table , i am trying 2 do this by vb.net 2005.
View 5 Repliesi want to set a complex column expression truncate(cdbl(Today()-date2)/30)*(parent(parentchild).field1/parent(parentchild(filed2)))but truncate function is not available !
View 12 RepliesUsing tabs for my web browser, I noticed (since im using documenttitle to populate the tab text) if a site has a long title, it will extend my tab var far, how can i limit this to a certain amount of text?
tab text code it:
TabControl1.SelectedTab.Text = CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).DocumentTitle
I wrote a loop that posted an accrued principal cycle to a listbox for a period of 10 years (10 loop cycles). The problem is: not only does the amount of the principal reconfigure for each loop cycle, but it does not truncate into a two decimal place holder as it should. I would like to use the ("F2") but I am not sure where to put it within the code. Here is what I have for the Calculate button event handler.
[Code]...