File Input (String) To Array
Sep 30, 2008
I am trying to write a program that reads values from a datafile and makes the data available in an array for further use in the program. The data consist of a description and then a value (COM_PORT=COM1, for example). My idea is to put the data in an array so that I can just search the array for COM_PORT and I will get COM1 back. Is that a good approach of handling it this way? What methods would I use to put the data (I use FileSystem.ReadAllText, the data is in a string) into an array? Would the split method work?
View 2 Replies
ADVERTISEMENT
Apr 2, 2010
I've got myself a CSV file with the following contents:
1,The Compact,1.8GHz,1024MB,160GB,440
2,The Medium,2.4GHz,1024MB,180GB,500
3,The Workhorse,2.4GHz,2048MB,220GB,650
It's a list of computer systems, basically, that the user can purchase.I need to read this file, line-by-line, into an array. Let's call this array csvline().The first line of the text file would stored in csvline(0). Line two would be stored in csvline(1). And so on. (I've started with zero because that's where VB starts its arrays). A drop-down list would then enable the user to select 1, 2 or 3 (or however many lines/systems are stored in the file). Upon selecting a number - say, 1 - csvline(0) would be displayed inside a textbox (textbox1, let's say). If 2 was selected, csvline(1) would be displayed, and so on.
It's not the formatting I need help with, though; that's the easy part. I just need someone to help teach me how to read a CSV file line-by-line, putting each line into a string array - csvlines(count) - then increment count by one so that the next line is read into another slot.So far, I've been able to paste the numbers of each system into an combobox:
Using csvfileparser As New Microsoft.VisualBasic.FileIO.TextFieldParser _
("F:folderprogramnameprogramnameinDebugsystems.csv")
Dim csvalue As String()[code]......
But this only selects individual values. I need to figure out how selecting one of these numbers in the combobox can trigger textbox1 to be appended with just that line (I can handle the formatting, using the string.format stuff). If I try to do this using csvalue = csvtranslator.ReadLine , I get the following error message:
"Error 1 Value of type 'String' cannot be converted to '1-dimensional array of String'."
If I then put it as an array, ie: csvalue() = csvtranslator.ReadLine , I then get a different error message:"Error 1 Number of indices is less than the number of dimensions of the indexed array."
Structure systemstructure
Dim number As Byte
Dim name As String[code]............
View 3 Replies
Jan 10, 2012
I read a line from a text file with text as "ABC.txt", "XYZ.txt", "TEST.txt".I use code file = sr.ReadLine(); to assign the text to variable file. Now I want to initiate a string array likestring[] FileNames = {file}; it doesn't work. What should I do?
View 2 Replies
Jan 20, 2012
I can't figure out the syntax for searching an array of stored words for a string matching an input string. I understand the pseudocode of it, but I'm tripping up over what variables I need to put where, and how they should be formatted. More than happy to provide more details should anyone request them.
[Code]...
View 1 Replies
Nov 22, 2010
I am trying to input a text file of figures into a 2-dimensional array. I want to do this so I will then perform percent changes on the respective columns. The text file contains columns and then numerous rows for each columns each number is separated with a tab. The text file looks something like this.
2.2 5.5
3.7 6.3
9.2 9.1
So I need to be able to input the text file, turn it into an array and then find the total percent change. From 2.2-3.7-9.2
View 8 Replies
Mar 19, 2010
I am having trouble turning a set of data from a .txt file into arrays, basically, what i have in the text file is:
Eddy vbtab 20
Andy vbtab 30
James vbtab 20
View 3 Replies
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.
View 1 Replies
Dec 12, 2010
Per this UserControl that can be added to a blank form, I would like to use the HorizUnits array below to map custom grid x coordinate from a mouse x position.For a given input value 13, what syntax would I use to obtain a value of 2 where 13 lies between Value 10 and 16 for which 2 (Name) would be the custom grid's displayed coordinate position?
View 1 Replies
Jun 23, 2011
n my project i am to enter a name and a test mark into two separate text boxes and then select the button to store the information into the arrays, one array for names and another for marks, but when it is reset using the Erase <Array> fuction andi try to re enter information, no matter what information is entered i get a "Null Reference Exception Unhandled" Error.I am using Visual Basic 2008.My code is as it says from now:
Public Class frmAdverageTestMarkCalculator
Dim ClosingMsg As String
Dim Closingtitle As String
[code].....
View 7 Replies
Sep 4, 2008
trying to find a decent answer for my question; I do have a utf8 file which I (down)load, manipulate and wanting to save back again.The result always is that the file I produce is not in utf8 format;
Dim fs2 As New FileStream("c: est.dat", FileMode.Create, FileAccess.Write, FileShare.None)
Dim w As New BinaryWriter(fs2, Encoding.UTF8)
[code].....
View 3 Replies
Nov 13, 2009
How to save a string array to file like writing a RichTextBox to a File? and How to Read that?
View 1 Replies
Mar 31, 2009
im using an array to retreive a string from a line in a txt file this is great the first time round but when i try to use the process again to update the textbox is doesnt work do i have to purge the array or some thing? im using the same script just mapping back to it so nothings changed ive tried using a second array with the same commands but different declared names and that doesnt work either Dim lines As String() = IO.File.ReadAllLines("C:myfile.txt")
Dim line2 As String = lines(2) textbox1.Text = line2
View 5 Replies
Sep 28, 2011
My objective is to, instead of entering in the data manually into the text boxes, I want to read in a textfile. The Calculate button will contain the code to read in the file and assign it to the appropriate textboxes. Save the separate file in the \bin\Debug folder.
The text file just needs to have 3 integers on 3 separate lines.The code I posted works without and errors, but.I am having some trouble integrating the Stream Reader.
[Code]...
View 14 Replies
Aug 30, 2010
I am trying to convert each line in a file into a byte array. The line in the file is similar to this:
:100000000247A1E59620E7FBE4F596900780E0FF24
I have code and have tried several things but they don't seem to be working out.
Dim fileline As String = ""
Dim linebytes() As Byte = Nothing
Dim idx As Integer
' Make sure the file is open for transferring the data to the board.
If Not (SoftwareUpdateFilestream Is Nothing) Then
[Code] .....
View 8 Replies
Sep 7, 2011
I can write a 1-d string array to file with:
Dim test() As String = {1, 2, 3, 4, 5}
File.WriteAllLines("C:MyFile.txt", test)
but can't see how to write a 2-d array to file.
I've tried this:
Dim test(,) As String = {{1, 2, 3, 4, 5}, {34, 22, 12, 33, 55}}
Dim myfile = File.CreateText("C:MyFile.txt")
Dim row, col As Integer
[Code].....
View 4 Replies
Jun 22, 2012
I'm trying to read the binary data from a binary file with the code below but the it's return the value in the byte array. How can i read the binary data from the binary file and then convert the data into string?This is how i create the binary file.
Dim fs As New FileStream(Application.StartupPath & "Agency.dat", FileMode.OpenOrCreate)
Dim bf As New BinaryFormatter()
Call bf.Serialize(fs, GAgency)[code]....
View 1 Replies
May 6, 2010
How can I write and read a string array to a text file?
View 2 Replies
Aug 7, 2009
i'm using Regex.Split to convert a text file's string to System.Array. The end result is System.Array of 211 strings.
Now what i need is to convert System.Array to a Byte of 211. How would I accomplish this?
System.Array to Dim x(211) as Byte?? Sample code would be great here. I've already visited many sites on this subject with no luck. code below.
[Code]...
View 4 Replies
Mar 15, 2009
We know that VB string start and end with double quotes " "
So we have to use "" if we want " in VB string.
I wonder if there is a regular expression pattern which will match VB string?.
View 2 Replies
Aug 27, 2009
I'm new to .net. I would like to know how to convert a text data in string or in a file into a simple byte array[ ] format.
View 3 Replies
Mar 11, 2010
my code is :
[Code]...
The error is Value of type '1-dimensional array of string' cannot be converted to 'String'.
View 2 Replies
Sep 14, 2009
Do anybody know how to input value to array? I know how to input the value by editing the code but I want to let users to enter value by themselves (such as using a input box). Plz help!
View 3 Replies
May 17, 2011
In my program, I need to have the user input a list of numbers separated by commas. How would I go about storing those numbers? Would I put them into an array? If so, how?
View 5 Replies
Mar 21, 2009
im creating a simple program where the user inputs there own numbers in a textbox and the program works out the total and average and produces a bar chart.I have done the hard part of creating the bar chart, but i am stuck on using the numbers in the text box from the array.This is the code for my array lists:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles graph_btn.Click Dim aMonths As ArrayList = New ArrayList(), aAmounts As ArrayList = New ArrayList()
aMonths.Add("1")
aMonths.Add("2")
aMonths.Add("3")
aMonths.Add("4")
[Code]...
View 4 Replies
Feb 12, 2011
I am trying to make a program using Visual Basic that will allow the user to add links to web pages (such as www.google.ca) to a list in the program and make it so that they do not dissapear once the program is closed.
So to get into more detail, I have a text box, a listview, and a button. When the user types a link into the text box it needs to be put into an array (called "addlink") and then when the user presses the button, the link is typed into the listview as an object.
Then if the user clicks on that object in the listview, it will open up the browser using the WebBrowser command. How do I set the text in the textbox to an array once the button is clicked?
Specifications:
OS: Windows 7 Ultimate Edition
Software: Microsoft Visual Basic 2010 Express
Experience with Visual Basic: Average
View 2 Replies
Oct 23, 2009
how to pass user entered data (from a textbox) to an array? All the examples I have found show how to populate an array with predefined values. Heres what I've got, its messing and not close to what I want.
Private Sub AddButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AddButton.Click
Dim AddNumInteger As Integer
[Code].....
When the users clicks the add button the value they entered in the NumAdd textbox is sent to an element?
View 1 Replies
Feb 24, 2011
? How do I use an array to store user input collected instead of storing the data in individual variables?
View 3 Replies
Mar 22, 2009
im creating a simple program where the user inputs there own numbers in a textbox and the program works out the total and average and produces a bar chart.I have done the hard part of creating the bar chart, but i am stuck on using the numbers in the text box from the array.[code]
View 5 Replies
Dec 8, 2009
I have 10 constant arrays of data that can be used throughout the program.[code]I also have an array that needs to be populated randomly depending on user input.array_user(8)If the user selects 3 for instance...I need the data in array_user to be populated by the data in array03.I know I can do that with if/then statements...but I'm sure there is a much simpler way to do it.
View 1 Replies
Mar 8, 2009
I'm trying to make a program where user can input data from a textbox into an array and when the user hit the enter key, it compare it to a data grab from a text file. Here is my code so far:
Private Sub TextBox_KeyDown(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox.TextChanged
Dim input As String
[Code]....
I got the part where the program can graph data from text file and put it into an array called "varia3". The part I could not get is allowing user to enter data into the textbox. When I run the program, the sec I try to enter a letter or number into the textbox the program ended.
View 2 Replies
