read data from text file , 3 data types saved on the file, "location", "time","sighting" eed to extract all data from file and save on a 2d array and display on a datagrid view.ata sorted by ascending order of time.
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Im doing some work right now for a class and this is my first time ever using arrays and im having some trouble. I need to make a program that places the names in an array using a text file and displays all presidents for a requested range of numbers. every time i try and run the program it says "Object reference not set to an instance of an object." but im not really sure what that means, Heres the code
Public Class frmPresidents
Dim numLow As Integer, numHigh As Integer, Pres() As String
Private Sub btnPresidents_Click(ByVal sender As System.Object, ByVal e As
[Code]....
So I am trying to learn vb.net and am a beginner. I find alot of online tutorials, but have yet to find one where I can follow what I'm attemping to do, just bits and pieces. I want to keep the code basic until I learn more, and in this case use two - one dimenstion arrays. I built a program to write Employee Names and Wages to a txt file.ie.
Jack Black vbtab 60000
Nick Mole vbtab 45000
and so on
I want to bring back that data and place the name and the and wage each into an array so I can calculate different criteria when I hit a search button. I will not know how many names and wages will be written to txt file. I am having trouble understanding exactly how to do this as all the examples I've found list only one array or the txt file is line by line like.
Jack Black
60000
Nick Mole
45000
Everything else I've found is over myhead so far.Here is my code so far if anyone can let me know where I'm going wrong. I have one error that tells me "property chars is read only". I have no idea what that means, even after reading up on it really...and I'm not sure if the rest of the code I've wrote is 100% anyway I assure you that I've spent more than a few hours trying to solve this myself.
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specifically reading from a text file, and placing that into an array.
But the problem is, that in each line of the text file, I have at least three different separators.
Sample:
14~8|3~7|16~5|7~4|1~2|3~1|_17
12~12|5~10|2~8|5~7|_0
etc.
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So, what I want to do, is read each line of the text file into a separate item into an array, and each item in that array is a record of another array(of terms) and a single(constant).
I've already got SOME code, but I'm pretty sure it's not going to work, and I don't know much about reading from text files and string manipulation in the first place.
i am trying to read from a text file and store the data in an array but i don't know how to get started with my code. can someone please get me started here.i have start with the code for locating the file, but i am having difficulty reading the file.
Dim strFileName As String
OpenAnswerFile.ShowDialog()
strFileName = OpenAnswerFile.FileName
[code]......
I have an assignment where I must read the information from a text file into an array of structs, so that when a part number is input, the correct price will be displayed.
the file is a text file named shoeinfo.txt
it looks like this: BZB34,40.99
BZJ25,54.50
JMM97,14.99
[Code].....
unfortunately I am unable to figure out how the code is to be read into the array. i.e. item(0).partnum = BZB34 item(0).price = 4099D
reading a text file into an array after a certain line in the text file, at the moment i am trying to do it using the method below: but i am having trouble thinking about how i can copy everyother line and also how i can count through the array the i = 0 and i = i + 1 are there while "i".
In a line what i would like to do:I need to copy everyother line for a known amount of lines that appears after the line " I FT I KT I " in a text file, but i do not know the position of this first line in the file.
Dim lines() As String = File.ReadAllLines(sessionsPath$ & "vmcg.afm")
For Each inline As String In lines
If inline.Contains(" I FT I KT I ") Then
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I'm sort of new to VB and have to use it for my Software Design & Development Major Project.I'm making a blackJack game, and i the names of all users in a file called "CurrentUserNames.txt".I'm struggling to get VB to read this file (items are line by line not separated by a comma or something) and then save it into an array called CurrentUsers(). This array is then displayed in a listbox called "lstAllUsers".I can get VB to read the file and put the FIRST item in the file into the FIRST line of the list box, or i can get VB to put ALL the items in the file into the listbox, separated by the little [] squares when the program runs e.g listbox, line 1 says - "Current [][] Names".[code]
View 17 RepliesI have a table of 51 data points all numbers between 0 and 8000, i have stored the data in an array of ushors's, and on my form i have 10 numerical text boxes, So that the user can change the values in the table every 5th value. Using the value changed event the program then re-calculates the values in-between.
What i would like to do is show the table in a data gridview and allow the user to change the values in the array using the datagrid view, i know how to create a table but not how to link the table, so that it can change the values contained in the array.
Below is the code i am using to create the table:-
Option Strict On
Public Class FrmViewTable
Private BindingSource As New System.Windows.Forms.BindingSource 'Create a binding source for the tabel & dataview
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I have a data grid view in one windows form named "GridViewForm". When the user search for the text from the search box from another window form named "FindForm", I want to highlight all the matching result in the data grid view. The search type can be exact or partial.For eg.If the user search for the text "stack", then the words "stack" from [Stack, stack-over, stacks, stack exchange] should be highlighted and first cell that match the query should be selected. When the user press next button then another cell that match the search query should be selected.My code for finding the text is like follow for it search only the exact word.
Dim gridRow As Integer = 0
Dim gridColumn As Integer = 0
For Each Row As DataGridViewRow In AccountsDataGridView.Rows
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Im trying to fill my DataGridView with data where the Column "RefID" is equal to the tbRefID.text that is on the same form but its not working my code is as follows.
Public Sub New(ByVal lviQ As ListViewItem)
InitializeComponent()
Me.tbRef.Text = lviQ.SubItems(0).Text
[code]....
and the code for the FillByRef is
SELECT RefId, QuTask, QuCost
FROM quote_tasks
WHERE (RefId = 'tbRef.text')
all it does is add the 3 column header to doesnt add any data?
I must use streamreader to read text file line by line into array.
Here's what I've got.
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
Dim numbers() As Double = New StreamReader(txtfile.Text)
Dim numbersarray() As Double
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I want to reading in a excel file and extract the sCodenumber sDescription ans the sStatus and store them in a array : StatusComposeArray(5200) As MyCompose. After this I need this array for comparing outside this class. But as can you see the array is defined inside the sub: ReadingIn_ExcelFilesCompose [Code]
View 2 RepliesI have some code that i am using which exports a datagrid view to an excel file. It works, I am trying to either delete or clear a series of unused columns at the ens of the sheet, there are 9 columns. I am using the following loop to rid the columns and i am getting Exception from HRESULT: 0x800A01A8.
I did some research and it seems to do with late binding, code that is giving me the exception follows:
Dim ZZ As String = "J"Dim AJ As Excel.Range = CType(wSheet.Columns("A" & ZZ), Range)
With AJ
For g = 1 To 9
.Select()
.ClearContents()
[Code]...
I read on msdn if AJ in this case starts out as nothing then vb will throw this exception and to use early binding. I cant bind a column if it hasn't been created yet, so i played around with the placement of the declaration of AJ to no avail, what is the right Direction i should take to fix this issue?
I want to read in a file and as I do put the contents into a datagrid, can this be done ?I have the following code so far
myPath = "C:SYNC_DATA�0 - LGW�5 - Archived�0 - IST Logs2008"
myFile = "istlog" & d.Year.ToString & d.Month.ToString.PadLeft(2, "0"c) & d.Day.ToString.PadLeft(2, "0"c) & ".txt"
Dim sFile As System.IO.StreamReader = New System.IO.StreamReader(myPath & myFile)
[code]....
I get an error on "adapter.Fill(dt)" which is propably incorrect.How can I get the ontents to be displayed in a datagrid on the screen called "DataGridView1"
I have this code that I got that exports data grid view in excel but I want to use save file dialog in saving the excel file. [code]...
View 1 RepliesI have a datagridview with transaction bindingsource I want the datagrid to show the sorted rows only not all the records when i enter a value into a textbox and click button sort.
View 1 RepliesI want to open a text file from a url (example: http://domain.com/mytext.txt)
and then load it into array. (Separated by new line)
I have another question. I'm thinking to develop a simple chat application. I'm thinking to write/read all chat messages in xml. is the idea logical for chat application development?
What I am trying to do basically is open an access query in a datagrid view and then be able to make changes to the datagrid and then save it back to the database.When I try to save:
Me.BindingSource.EndEdit()
Me.TableAdapter.Update(DataSet)
It says that update is not a member of the tableadapter... Why is that?
[Code] This is the coding i have used to a datagrid with textbox and combobox column. But for the first column i have to generate a unique name for each item and display in the first column of the data grid. I used array of string and tried to add that array value to the first column. But it is showing the error " Object reference not set to an instance of an object". how to add the unique name column to my datagrid.
View 4 RepliesI'm working on a project that requires me to take values from a CSV file. I've to do further processing with these values and it'd be great if I can have these values in a 2D array. The number of rows and columns of the CSV files changes at regular intervals.I'm unable to take these values into a 2D array in VB.NET/C#.[code]
View 4 Replieswriting a code in vb.net to read a data from CSV file into an array..
View 10 Repliesim really new to vb.net and really need to finish this project.So what i want to do is read from a .txt file.This file has loads of proxy IP addresses and is stored in this form, (as a list) i want to (using an array most probably) be able to select one proxy off the list in the txt file. I then want a variable that i can change so that i can hook it up to a timer so i can change the proxy every thirty seconds or so.(does not have to be random selection, what ever is easiest)
The underlined txt is what i need help with, i can do the rest myself, this is my code although it probably would be a good idea to start over because im un sure what i am doing
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I have a file C:\level1.txt that has a long row of numbers 0 or 1 to represent a green or red tile drawn.For example here is the txt file I am using right now: [code]This is the EXACT formating of the txt document.The issue on hand is I am unsure if this data gets written to the array correctly, since all my "tiles" are red.Here is the code I wrote: NOTE: Just add a 250 by 250 picturebox1.[code]
View 1 RepliesI need some input on what I'm doing wrong. What I have so far is an order form program where customers input their information and what they want to buy. Now, what I'm trying to do is take the customer information, store it in an array, write the customer information to a file, and then when I open the order form, it loads the customer information file and automatically fill in a display box on another form with all the customers and the information.I want each customer in a file to be stored on one line. Like so: (Name, address, city, state, zip)
Mike-123 E Dream Rd-Denver-CO-99558
Jane-234 E Code Rd-Seattle-WA-99458
Then when the file is read, to read it, and add each name to a structured array (customers(NumberOfCustomers).Name, customers(NumberOfCustomers).Address, customers(NumberOfCustomers).City, customers(NumberOfCustomers).State, customers(NumberOfCustomers).zip).
After it has all been added to the array, all customers in the file, I want to loop through the array and display each customer on a new line in a listbox, which opens in another form.So far, everything works IF I don't write to a fail. If I store the customers in an array and use a loop to display the customers in the listbox, all is well. However, when writing to a file and trying to read it back into the array is where I've hit a problem. The following code seems to work well, however, it just reads the first line over and over as many times as there are lines in the file, and displays all those using the loop. I just need a way to loop through the lines and store each line into each structured array for each customer, instead of read the first line 12 times over into 12 different places in the array.
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Code:
Private Sub weeklyTextBox_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'disables and enables correct buttons for initial start
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I am working on a project in VB 2008 and need it to do this:Read first line from text file (using Openfile)Enter line into textbox on formDo some other codeThen Read second linefrom text fileEnter line into same text boxand loop until we have gone through text fileI am not sure how to read line by line from text file then enter it in textbox. I can open the Openfile and get the filename and everything, but I just am not sure how to read from it or enter that line into the textbox.Here is what I have, its not much but its a start:
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim FileReader As StreamReader
[code]....
I have gotten farther along in my work, and the "add friends" works great Now, I am working on deleting friends. I have the following snipplet from my code:
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how to read this file into my structured array. it's a 'quiz generator' program. i have a .dat file with a set of 10 questions, and i need to load it into my structured array:
vb
Structure testQuestion
<VBFixedString(100)> Public question As String
<VBFixedString(30)> Public choiceA As String
[Code].....
This code get the data into the file, but no back out.Where am I going wrong?
Code: Function test() As Boolean sFileName = "Carrier.dat" iFileNumber = FreeFile() FileSystem.FileOpen(iFileNumber, sFileName, OpenMode.Binary, OpenAccess.ReadWrite)
If FileSystem.FileLen(sFileName) = 0 Then ReDim tMyStructure(7) tMyStructure(1).name =
[code]....
