Search And Get Index String In A Big File?
May 22, 2011
How to search and get position a string in a big file?I have searched in forum2 and get several ways to search for strings in files, but it is not for large files above 500 mb,I have just been make a function to search string and get its index,but it is very slow and uses lots of RAM.This is my function
Function StringInFile(ByRef fs As FileStream, ByRef
substring As String, Optional ByVal occurence As Integer = 1,_
Optional ByVal start As Integer = 0, Optional ByVal count As Integer = -1) As Integer
[code]....
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Aug 29, 2011
How on specific behaviour can be created in a custom class. I want to be able to create a custom class (a kind of list) where I can access the items by their index (this is the easy part), but also by a string that would describe them. Here is an example:
MyClass(1).SomeProperty = "NewValue"
MyClass("Item1").SomeProperty = "NewValue"
You can see this kind of behaviour in dataset for example where you can select a table by its name or by its index like this :
DataSet.Tables("MyTable").Rows...
DataSet.Tables(1).Rows...
How can I create a custom class that will behave like this?
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Nov 6, 2010
Given an enum similar to this:
Friend Enum TestValue As Int32
tstNotSet = -1
tstA = 0
[code]....
As noted in my comment to Jon Skeet, this construct, along with the rest of the Object's components, executes 100,000 times in a profiling loop in ~570ms (rough average of 3-5 runs).
Exchanging the above construct out with a smaller Array.IndexOf construct loops 100,000 times in ~630ms (again, 3-5 runs, rough average, the whole Object). The new construct looks like this:
Dim p As Int32
p = Array.IndexOf(TestValues, s)
If p <> tstNotSet Then
[Code]....
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Apr 1, 2009
I have been searching for a while now, but I still can't seem to figure this out. I wrote a rather large program, and to make things more efficient I started to create structs to store more info in a variable.All was well replacing my old code with new code, till I reached a certain point and found that blindly using a loop of integers to access the indexes of the array wouldn't work anymore... I need to access a specific struct by the information contained in a single variable within the struct (like a hashtable key), but can't seem to figure out how.
Is it possible for me to go through my array indexes in a fashion like this?:
Dim myArray(TableCount) As myStruct
Dim TableName As String = "SomeTable"
[code].....
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Jun 30, 2009
i want index of the first value in a string Without calling IndexOf.
Like, " I am going" and my search value is "am"
so it should give me index value as "2".
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Oct 11, 2010
i need a vb8 code to open a txt file,search for a string in it & extract string in a excel file.
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Nov 4, 2009
I have a single text file and I need to search the file for any instance of the
string (Product_Type: "Hardware", "xxx", "xxx") the Product_Type is constant and has several instances within the file but the "Hardware" changes. I need to show all the values inside the quotes of the "Hardware" string to a listbox.
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Sep 21, 2009
The format I need is a group of numbers in a text file and it looks like this and it will always look like this:xxxx x xxxxxxxx xxxxxxxxx x xxxxxxxxxxx xxxx x
The problem is that it can be anywhere in a text file so I cannot search by a particular line.
How can I search for this type of string format in a text file?
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Oct 26, 2010
I want to search for a String Pattern in a Binary File (Binary File is not 100% plain text). Here is the pattern:
"**_*_*_*"
or
"111_11_11_112"
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Apr 10, 2012
So I am trying to create a Win App to make copying files using Robocopy easier and eventually other tasks. Basically what I have so far is a Button that calls the Sub Robcopy_EXE. There is a tab on the form with 100 check boxes, one for each terminal, that will be designated by the user and a check box to determine if you want a detailed report or not from Robocopy. I also have a text box for the user to input the first 3 octets of the site IP Address. The check boxes and Input field are used to create string "Terminal_input" which is what runs Robocopy in CMD. Robocopy logs its progress to a text file that I have labeled "Status.txt". That is as far as I have gotten.
[Code]....
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Dec 12, 2009
I was hoping someone could assist with the following coding; I am trying to search a very large csv file (approx 200,000 lines) for a user defined string eg "0100020789" and I essentially want to print all the lines that contain this to a text box on screen. Please not that the csv file does not have standardised column headings, each line is different. There would be approx 5 lines that contain the input string.
I am concerned with the v large csv i am using which will prob slow everything down, but then I thought if simple text pad application can search for a string in complete files with similar sizes like that and return a result in less than 1second, then it must be do-able.
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Jul 2, 2012
I want to search for a string entered in a column of a datagridview in a text file.If this string exists in the file then allow the user to enter it otherwise dont allow the user to enter the string.Also,since I am reading data from the database into the datagridview, I have not added columns to the datagridview using edit columns option. How do I do this in vb.net.I tried doing something like this:
CODE:
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Sep 9, 2011
Is there any way by which I can add a location to Windows 7 search index and make it indexed in .Net?
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Feb 3, 2010
getting started with creating an index search for parallel arrays. When the user enters the specific "code", and presses enter, the information in the other arrays should be displayed based on its matching index. I'm pretty sure I use "For i = " but I'm lost. I have my arrays set up like this:
Dim code(9) As String
code(0) = "A"
code(1) = "H"
[code]....
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Nov 18, 2010
I would like to read an HTML file, search each line to see if it starts with </head>. Then add the centering code after it. That line at destination file should read:
</head><table border="0" cellpadding="0" cellspacing="2" width="760"align="center"><tr><td>
After this I don't care to search for anything. Just read from source and write to destination. I know there are programs out there to find/replace text in series of files but I am not allowed to use external programs.
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May 1, 2011
How do I use the Indexof Method to search for an Index a number? The number will be different on each line of the file. Each array has a name and a different zip code. I want to tell it to search for the first number in the line. Everything before that index will be first name, last name, and then zip code.
[Code]...
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Oct 30, 2011
I have the following code:
indexOfSearchText = TextBox1.Find(item, start, TextBox1.TextLength, RichTextBoxFinds.WholeWord)
If indexOfSearchText <> -1 Then
startindex = indexOfSearchText
End If
But I want just the first result, if I have an example text:
then it searches twice "is", I just want the first "is".
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Nov 15, 2011
I am trying to do a search on a index/row number taken from a dataview i.e. I enter 379437 in the input box which I know has a index/row number of 6. Now when I replace the Rows(index) with a Rows(6) I get the results that I want. When I run the code below the index comes out as 75 which displays the first row from the dataset which is a completely different set of results.
[Code]...
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Feb 15, 2012
highlight listview item from mysql search statement then get the index?
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Mar 29, 2010
I need to create a telephone directory with search option(textbox). I use sql db as backend and vb.net for frontend. In this the user must search for a particular name using the textbox and the results have to be displayed in the gridview. how to do this?
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May 30, 2012
I have a List(of String()). I have written a custom comparer (implements IComparer(of string)) to do an alphanumeric sort.Is there a way to sort the List using a given index to determine which position in the String() to sort by? In other words one time I might sort by Index = 0 and another time by Index = 3. The length of all String() in the list is the same.For reference this question is similar to Sort List<String[]> except I am using VB.net and that question is hardwired to Index=0.
EDIT from OP's comments:I started simple with the non custom comparer but I am getting an error: expression does not produce a value. Not sure what I am doing wrong.Here is the code:
Public Shared Function SortListOfStringArray(ByVal ListOfStringArray As List(Of String()), ByVal SortByIndex As Integer) As List(Of String())
Return ListOfStringArray.Sort(Function(x, y) x(SortByIndex).CompareTo(y(SortByIndex)))
End Function
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Aug 30, 2010
I like search a file TXT with this contains:
Name "Paul"
Age "11"
City "Chicago"
my question is: Its possible get a string "Name" and give me the value "Paul"? I have this function for get strings:
[code]...
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Jan 5, 2010
I'm creating a search function to search through a binary file and find a record based on the users input. Surprisingly, that isn't the problem! The problem I'm having is that as part of this I'm using a procedure to display results in text boxes, and I'm getting the error "Too many arguments to private sub display customer"I've encountered this error before, but never really knew what it was... Here is my code.
Private Sub btnSearch_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSearch.Click
FilenameCust = "F:\College\CustomersFile.bin"
[code].....
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Mar 20, 2010
how can I search a textbox for a string within a string and if certain word (string) found enable a timer?
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May 5, 2012
I have written a program that uses an array of the english alphabet and Morse code. I also built a form with a input box for the alphabetic information and an output box with the Morse Code. What i am trying to do is basically type a word like "Hi" in the input box and produce the Morse Code equivalent in the Morse Code output box. [Code] This works but only one letter at a time. Do i need to Parse the string of characters one at a time, and then run it through a loop like i have created?
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Jul 7, 2009
In the past I had the indexing service installed on a Windows Server 2003 and used it to index files for my website. I did this by executing an OleDbCommand with a query and a connection string.How do I accomplish the same thing with the new "Windows Search Service" (Windows Server 2008) by using VB.NET? Does this work the same way so that I only need to change the Provider name which has been "MSIDXS.1" up to now? Case true, what is the new Provider name?
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Dec 1, 2009
I have converted this existing C# .NET 2.0 code (which appears to take in a string with any characters and return only the numbers in that string):
private static string StripMIN(string min)
{
string result = string.Empty;
int digit = 0;
[code]....
I am getting an error message on line 6 of the VB.Net code at min(i). The error message reads:
"Expression is not an array or a method, and cannot have an argument list"
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Apr 10, 2009
Say if I have an arrayList, AL, that have the following sentences:
AL.item(0) = "This is a brown fox."
AL.item(1) = "This is a brown cat."
AL.item(2) = "This is a brown dog."
Is there an easy way to search "cat" in the arrayList and index 1 will be returned?
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Apr 27, 2011
I have a non standard text file, ie its not delimted etc, its pretty much free flowing. What I want to do is to search for a specifc string eg. "xyz123" and then replace it with what a user types into a text box, lets call the text box and its contents "txtreplace".
I am trying to replicate a find and replace function essentially, but will need to tailor it later on down the line, but this will be a starting point.
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Oct 22, 2010
I have a text file that is automatically generated by an older computer system daily. Unfortunately, the columns in this file are not delimited and they are not exactly fixed width (each day the width of each column could change depending on the amount of chars of the data in each column). The file does have column headings, so I want to find the width of each column using the column headings. Here is an example of the column heading row:
JOB_NO[variable amount of white space chars]FILE_NAME[variable amount of ws chars]PROJECT_CODE[variable amount of ws chars][carriage return]
What I want to do is get the index of of the first char in a column and the index of the last white space of a column (from the column heading). I would want to get the index of the "J" in JOB_NUM and the last white space before the "F" in FILE_NAME for the first column.I guess I should also mention that the columns may not always be in the same order from day to day but they will have the same header names. I know I can use the string.indexOf("JOB_NO") to get the index of the start of the column, but how do I get the index of the last white space in each column? (or last whitespace before the next first non-whitespace that denotes the start of the next column)
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