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 =
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How can i write and read a array of a structure to a file? I have the following structure
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I have an array of structure like this:
Structure Planner
Dim Type As String
Dim Circuit As String
Dim Socket As String
Dim StepCMDText As String
End Structure
how do i write it into a file? (also read it later
I have a bar cash register and have buttons for the drinks and number pad. In the program I have it working and it is reading the File and storing it in a Array. the problem i have is writing back to the part of the textfile. Here is 2 of the drinks buttons, all the rest of the drinks are the same.
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I have several quesions about reading/writing structures from/to files.In a scenario when I open a data file having its own header and variable data fields I create a structure that represents a header consisting of 9 bytes:
Public Structure HeaderInfo
Public DataField1 As Integer
Public DataField2 As Byte
Public DateField3 As Integer
End Structure
I'm using this code for the time being:
vb.net
Public Function ReadHeader(ByVal FileName As String) As HeaderInfo Dim ReturnInfo As HeaderInfo Try Using br As New IO.BinaryReader(New IO.FileStream(FileName, IO.FileMode.Open, IO.FileAccess.Read, IO.FileShare.Read)) With ReturnInfo
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The first question is - can I fill the structure directly somehow? Some structures are very long and filling them this way will be tedious. For example, if I know the length of the structure I could read the needed number of bytes in a byte array and somehow marshal these bytes into the structure.I can use Marshal.PtrToStructure, but then I would need to get an IntPtr of my byte array. I use <Serializable()> attribute for my structure.
I am trying to write a pre defined strcture into a binary file. how do i achieve this ?
my typical strcuture looks like
userid 2 bytes
company name 2 bytes
email address 40 bytes.
How can I write/read a structure variable to a file?
The structure variable is declared as :
Public Structure StructDimensions
Public RectHeight, RectLength, RectWidth As Double
Public PitchedLength, PitchedWidth, PitchedHe, PitchedHr As Double
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Is there a simple way to create a file for this type of data?
i have the code bellow to write a structure to a text file, but nothing is happening,how can i get a error message if the file doen't exist?
Imports System.IO
Imports System.Runtime.Serialization.Formatters.Binary
Public Class Form1
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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 Replieshow to save an array of structure to binary file. I tried the binary formatter but it still aint workin. My code attached
Dim directoryList As String()
Dim fileData() As myData
Dim myFile As myProps
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I have a .txt file i want to read that has states by abbreviation and states by name. In that text file some are territories and some are states.
I want to read from that file and put the abbreviations into one structure array and the states into another structure array.
I then want to lookup up the states by abbreviation or state name. The lookup will simply be selected by a radio button which will flag either the states full name array, or the abbreviation array.
all I have is the structures created:
Public Class Form1
Structure Lookup
Dim Abbreviation As String
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How can I read from the .txt file and store into an array
currently working through a project using VB 2008 windows form application and having a little trouble with the code. I need to read data from a text file into an array of a structure, displayed in a list box and have a number of searches conducted on the data and these results displayed on the form. The test data is of rainfall across a number of areas and is in the format:
i need to save an array of intptrs as a part of a structure in a file, vb.net gives me "File I/O of a structure with field 'pList' of type 'IntPtr' is not valid." error, ok i figured and tried to convert them to integers and while it worked for other singular intptrs it did not for the array as it just throws me a conversion error. I then tried rebuilding the array in the new sub of the save structure and while that sorta worked(i think) it then gives a "bad size" error when saving. Im out of ideas, saving the array elements one by one would be suicide as the amount varies and is well in hundreds,
View 1 RepliesI am trying to communicate with an external device and i am trying to send a byte array to the external device via sockets but i am always getting a response the message size is too small so i am not sure what i have done wrong. Between the data type there should be no alignment present and all numbers are represented in little endian format. The char array is not null terminated as mentioned in the protocol specifications.
I have to send data based on a struct that embeds 2 other struct. So here's my vb.net code for the struct used to convert to byte array and the sending part.
Public Structure MESSAGETYPE_OIP_Login
Dim Header() As COMMANDHEADER
Dim UserName() As PSTRING
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I'm trying to build something called a structure which will store data it retrieves from a text file. I have the structure set up like this:
Structure Employee
Dim FirstName As String
Dim LastName As String
Dim ID As String
Dim Hours As Integer
Dim Wage As Decimal
Dim EarnedPay As Decimal
End Structure
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How to set these operations up?
Define a structure named product, The structure should contain 2 variables one as a string and the other as a decimal. The decimal is used to store the price and the string is used to store the item number.
Declare a module level array that contains 5 product structure variables
Code the main forms load event procedure so that it reads the item number and prices from the itemInfo.txt file The procedure should store the item numbers and prices in the module level array. It also should add the item numbers to the list box.
When the user selects an item in the list box the items price should appear in the xPriceLabel. code the appropriate procedure.
The code I have is as follows
' Project name: Glovers Project
' Project purpose: The project displays the price of an item.
' Created/revised: <your name> on <current date>
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Seems the problem I am having is this line is returning a value less than 0.
itemprice = (itemnumber.Substring(productIndex, newLineIndex - productIndex))
I'm close to getting this to work, but currently can't get any output to display in the listbox. I had it working, but needed to move some things around to get the join function to work.In my program, a user enters input into a textbox and an array is displayed in a listbox based on what they type in. For example, if they type in "a", all foods (in the textfile that is connected to the program) that start with "a" will be displayed.
When there is output, I need to find a way to name this array (which is created based on what the user inputs) and join all of the items in the listbox (example: foods stacked on top of each other in the listbox will be shown at the bottom as a string).I am posting the code that I have thus far; all of the errors that I'm getting (and potentially my logic errors) are just in the first public class until the end of the first if-next statement:
Public Class frmFoods
Dim foods() As String = IO.File.ReadAllLines("foods.txt")
Private Sub btnDisplay_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDisplay.Click
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I'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 want to make a structure within a structure. Basically it will appear like this:
Structure ID
dim CardType as string
im CardCode as string
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In Vb.net I am trying to assign an array of structure to another array of same structure[code]...
View 2 RepliesI have a file and inside the file the format is like that :
123.567 456.789 12.345 223 223 221 223
123.555 456.788 12.344 223 223 221 222
123.456 345.678 456.234 445 445 445 445
'''''''
total line is 3456789903
I want use vb console application to read the line and every 130000 line create a new output file.
How do I read a raw byte array from any file, and write that byte array back into a new file?
View 3 RepliesI 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 RepliesIm 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
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I 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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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.