Say I want to remove all lines that contain "hello". One way to do it is to read the whole files into memory and then operate. Often my files are big, 500MB. If I load them I got no memory. Will upgrading to a 64 bit computer helps? I have a big page file. Also I wonder how in the earth windows 7 and xp 32 bits can have very large page files anyway.
View 9 RepliesWhen you need to do random access to the lines of a text file, the regular solution is to put those lines in a list and access them in that list.But doing this if the text file is large creates a large memory overhead and may cause some memory stress on the application.This class maps the file and provide the ability to read any particular line in the file at a random position, without the need to read or put in memory any other line but the desired line. The only memory overhead involve is the 1024 bytes buffer of the base stream.Even if the file mapping can be a process that consume a noticable amount of time if the file is very large ( ~ 5 seconds for each 100,000,000 caracteres) , once the mapping is done the access to a particular line becomes instantaneous regardless of the size of the file. (The file mapping can always be done at a convenient time (ex when the process load) and can be done on a worker thread The class is base on a StreamReader to support the differents Text Encodings Example uf usage ( As I say, if the file is very large, dont do it like that, but declare the class at a convenient time)
Imports Reader = System.IO.MyStreams
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[code]....
I have lines like this in my text file
10.0 28 Black (2 01.00 15.0) [1 06.81 58.3] 114111 -81725 191654 -41066
10.0 28 Black (2 01.00 15.0) [1 06.81 58.3] 114111 -81725 191654 -41066
11.0 28 Black (2 06.00 01.0) [T375 ] 135111 -46725 188611 35775
[Code]....
I want to remove all the line which contain [Txxxxx..] and place it in another file. i want to be do like cut and past. Is that possible. Can we remove lines in text files?
Having trouble removing Duplicate lines in a text file. (Exact Duplicate lines).
If I have a text file called animals.txt, how can I use the StreamWriter to loop through a text file, and erase and duplicate lines?
For example: If the text files says this...
cat
cat
cat
dog
[Code].....
How would you program it in VB 08:
What i have here in my text file is[code]...
I have a text file that I'm reading into a listbox. I want to skip a line if it's blank. The following code works if I leave out the check for the line being blank. It puts the file in the listbox with no errors. However, when I include the If statement that checks for the line being blank, I get an ArgumentNullException in the Items.Add line when It gets to the end of the file.
'Read Multiline File
Dim FILE_NAME As String = "C: empliz-etsy.txt"
'
If System.IO.File.Exists(FILE_NAME) = True Then
[Code].....
this is the code working 100% for (merge , remove duplicate lines and Store ) two text file using vb.net Imports System.IO Public Class Form1
[Code]....
I'm trying to remove the first and last lines from a text file. Obviously the last line will be at an undetermined position (i.e. line 50 or 5000). I couldn't figure how to remove the lines, so I wrote code that would rewrite every other line:
View 6 RepliesCurrently we have a large DataTable (~152k rows) and are doing a for each over this to find a sub set of distinct entries (~124K rows). This is currently taking about 14 minutes to run which is just far too long.
As we are stuck in .NET 2.0 as our reporting won't work with VS 2008+ I can't use linq, though I don't know if this will be any faster in fairness.
Is there a better way to find the distinct lines (invoice numbers in this case) other than this for each loop?[code]....
Some of my users are collecting data files this size and wish to load it in to my tool. Is there a way to load large files of string data w/o getting a OutOfMemoryException? I have tried many different storage methods (Array, List, etc) but always without success.Before anyone asks 'why load it all at once', let me say the nature of my app is speed critical and it must be so.
View 3 RepliesI try to remove empty space from a large string, using replace(), and using regex.
the replace method:
replace
Do While (stripped.IndexOf(Space(2)) >= 0)
stripped = stripped.Replace(Space(2), " ")
Loop
and with regex using its replace with : "/ss+/" - regular expression.
but I am still stuck with empty strings such as :
temp ""String
these string have lengths ranging between 3 and 8, so I have tried to adapt the replace function with something like this:
replace 2
Do While (stripped.IndexOf(Space(4)) >= 0)
stripped = stripped.Replace(Space(4), Space(1))
Loop
I 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 am creating a VB application in Visual Studio 2010 that installs some SQL stored procedures. These stored procedures are encrypted otherwise I would just supply my clients with .sql files to create the stored procedures.
The install script that creates the stored procedure is 1500 lines in length and has been formatted in the way VS 2010 requires multi-line literals to be in:
"First Line" & _
"Second Line" & _
"etc..."
[Code]....
2.0 28 Blue (2 14.00 63.0) [2 12.43 54.3] 42111 9275 55111 -1725
2.0 28 Blue (2 14.00 64.0) [2 13.50 55.3] 40611 9275 53611 5775
2.0 28 Blue (2 14.00 58.0) [2 12.21 54.3] 49611 9275 55111 -3225
5.5 28 Blue (2 20.00 17.0) [2 13.50 26.3] 111111 51275 97111 5775
[Code]...
2.0 28 Blue (2 14.00 63.0) [2 12.43 54.3] 42111 9275 55111 -1725
2.0 28 Blue (2 14.00 64.0) [2 13.50 55.3] 40611 9275 53611 5775
2.0 28 Blue (2 14.00 58.0) [2 12.21 54.3] 49611 9275 55111 -3225
[code]....
Question is:
<Line1:
Line2:
<Line3:
Line4:
<LineN
How can I remove lines from textbox which starts with "<"?
I want to remove the lines that contain specific text. (Whole Line)
[Code]...
So textbox1.text will become and remove whole line that contains the word "daniweb"
[Code]...
I am trying to automate the removal of lines in a text box with no characters or numbers. I have the following code, but it is not working.
Code:
Private Sub RemoveBlankToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RemoveBlankToolStripMenuItem.Click
Dim tmp() As String = RTB_01.Text.Split(CChar(vbNewLine))
[code]....
So me and a friend started a project in school and we decided that i'll do most of the design part and he'll do most of the coding. I wanted to change the design on my buttons and changed the button image background and changed flatstyle to flat. Now there's this thin white line around every button instead. how can i get rid of it? Check attachment.
View 1 RepliesI have posted this question in the below link, but dint get the solution.... I have to finish it as early as possible..
View 13 RepliesI have two text files and each text file has various columns (each column is separated by a tab " "), now some of the fields in column1 text file2 match the fields in column1 text file1. What I'm trying to achieve is to remove every row in text file 1 where the field in column1 matches the field in column 1 textfile 2 - is this possible?I have used some basic coding in the past to remove certain lines, but nothing as complex as this.
Dim linesList As New List(Of String)(File.ReadAllLines("Path"))
linesList.RemoveAt(1)
File.WriteAllLines("Path", linesList.ToArray())
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.
I need to go line by line through a text file as well as a listbox and remove lines over x amount of characters as well as adding the number of skipped lines to a label. I am trying to use a listbox in this example but it is not working correctly. What I am I doing wrong? First it will only remove an item when it is highlighted (focused) how can I make it so that is not required?[code]...
View 7 Repliesremove blank lines from listbox?And remove specified text from listbox (text line that i can specify in form code(But if i specify to remove line something like [URL] it will remove the line [URL] but doesn't remove line [URL].
My code for adding items to listbox is:
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
Dim PageElements As HtmlElementCollection = WebBrowser1.Document.GetElementsByTagName("img")
For Each CurElement As HtmlElement In PageElements
[code].....
Does anyone know if there is a command to remove extra whitespace (blank lines) when coding?
View 8 RepliesI'm making a button to delete lines not containing specific text.
For example, if the text is "test". I want to remove all lines not containing "test" in it.
I use the following coding to replace a word in my textfile, would it be possible to add any coding that will remove all blank lines from the same text file?
Dim EditMyFile As String = IO.Path.Combine("D:Test.txt")
Dim inputFile = Regex.Replace(IO.File.ReadAllText(EditMyFile), "test", "test2")
IO.File.WriteAllText(EditMyFile, inputFile)
I have tried the following but it doesnt work.
Dim EditMyFile As String = IO.Path.Combine("D:Test.txt")
Dim inputFile = Regex.Replace(IO.File.ReadAllText(EditMyFile), "test", "test2")
IO.File.WriteAllText(EditMyFile, inputFile)
Dim sText As String = File.ReadAllText("D:Test.txt")
Dim sNewLines() As String = sText.Split(New Char() {ControlChars.Lf}, StringSplitOptions.RemoveEmptyEntries)
File.WriteAllLines("D:Test.txt", sNewLines)
Compare textboxes and remove duplicate lines/text..
View 3 RepliesI am working on a utility to reformat a text file. Working on language to remove duplicate record entries. However there are desirable ("keeper") duplicates and then those I want to remove. I handled the problem by temporarily assigning a unique number to each @D line, then stripping them off after I've removed duplicates. So far so good, except in removing unwanted duplicates I have an extra of the "keeper" duplicates left that doesn't get removed. See below. I am wondering if there is a way to search for a line in a textbox starting with a certain character, but is also proceeded by 2 blank lines and followed by 1 blank line. CODE IM USING TO REMOVE DUPS yet keep formatting with blank line separators, etc.:
[Code]...