VS 2008 - Any Way Of Resetting StreamReader Value?
May 7, 2009
I'm trying to do a simple loop while reading a file. I have tried to make the streamreader as a public value, so this way it would be passed between the subs, or rather changed by each sub working with it. The problems comes into play, when I double click the read button, since the value of sr is assigned to -1 after the first full read, so the program doesn't read the data from begging but assumes the end of the file and stops. Is there any way to reassign or reset the value of sr so that the file will be read again from the beginning? This is the example code I got.
Public Class formcollegetut
Public sr As IO.StreamReader = IO.File.OpenText("colleges.txt")
Private Sub btnDisplay_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDisplay.Click
Dim test As String = ""
Do While sr.Peek <> -1
ReadData(test)
[Code] .....
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Jan 28, 2010
I've created an application that runs queries against a SQL server (via Data Adaptors) in VB.NET 08 and returns the results to a DataGridView. It works great and returns my data, but when I switch to a different query that returns different columns, the DataGridView keeps the old columns from the previous query and adds the new columns from the new query to the end (far right) of the DataGridView. Is there a way to counter this? I don't want those previous unused columns showing up in my results.
I tried setting the DataGridView DataSource and DataMember to Nothing and that didn't fix it.
Here is my code...in case that helps
Connection.ConnectionString = "Provider=SQLOLEDB;Data Source=;Initial Catalog=;Integrated Security=SSPI;"
Connection.Open()
[Code]....
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Oct 23, 2009
On my yahoo emailer program , i have a scrolling text message (label4) saying "your message has been sent" when i click send. But the text remains on the screen after i clcik the "Refresh" button.This is what im using to clear all the other textboxes :
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code]...
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Aug 4, 2009
After the client finishes testing, they go to the results page and then my program returns them back to the secondary page.If they re-enter the testing page again, for a second go-around, with out completely leaving the program as I have been doing since I was tweaking the code after each run, the repetition counter is not resting back to Zero. It�s still retains the information from the previous testing phase.
Example:The client chooses how many testing cycles they want to go through, from 1 to the total amount available to them to test. Right now its only 5.When they first start testing, it starts at �1 of 5�, then progresses at one increment for each drug they test on. Once they reach 5 and answer their final question, the program then goes to the results page and then to back the secondary page. If they choose to re-enter the testing page without totally leaving the program, the testing page counter sits at �5 of 5�. Shouldn�t the page be resetting the variables each time it loads?
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Jun 3, 2012
I'm having trouble resetting the date_time variable on my unix timestamp converter.
Dim date_time As New DateTime(1970, 1, 1)
MsgBox(date_time)
date_time = date_time.AddSeconds(10000)
[Code].....
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Apr 19, 2011
I have a problem with a streamreader in visual basic 2008.I am updating a database from text files on an ftp server. The streamreader works fine until the file is more than 100,000 bytes long.It reads until it reaches this point and then just ends. No error message, it just reads to this point which happens to be 2 fields out of 6 in the database stream. My question is - does the streamreader have a limit? And if so what is a workaround?
Dim connString As String = "Data Source=" & pDataBase
conn = New SqlCeConnection(connString)
Dim strQuery As String = ""[code]......
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Jul 9, 2009
I'm writing a program that basically loads an entire text file into a streamreader variable, then reads this variable line by line and parses and writes a line into a new text file. I'm VERY new and my knowledge is mostly self-taught, but I can't seem to get out of this one. It works for smaller files, but it appears to reach a limit in characters at some point because in a file of 900 lines, it stops writing about halfway through 800 and there are no errors, the program actually completes and the message box pops up.
There are a few things with this code I already know I should fix, such as creating the new text file name, it's messy, I just don't know how.
Private Sub btnProcess_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnProcess.Click
Dim IndexValues As String()
[CODE]...
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Jan 19, 2009
I have this code to send all line of a txt file to a listbox (StreamReader).
Dim sr As New IO.StreamReader("Items.txt")
Do Until sr.EndOfStream
lstItens.Items.Add(sr.ReadLine)
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Mar 21, 2009
So I made an irc client that connects, sends commands, joins a channel etc perfectly. But I can't figure out how to use streamreader to read the data that the server is saying to me, or actually read what others are saying in channel.By the way, I used TCP client.
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Dec 28, 2009
I'm creating a text file and, among other things, I need to write the text of the parent and child nodes of a TreeView to the file. I know how to write the contents and read them just fine, but what I can't seem to figure out is how to write the contents if I don't know how many parent nodes or child nodes there are. When I do, I usually do the following:
[Code]...
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Apr 21, 2009
I am trying to create a program that has the following aspects:2 combo boxes each containg a list of seven cities (both combo boxes have the same cities listed in them)text file containing distances to each city from one another eg if southampton is selected in one combo box and london in the other it will call 164 from the text file this means that each city needs to relate to a certain row or column number depending on the line in which the data is held in the text file. Here is what i have so far code wise:
Private Sub frmDistance_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim rowcolumn(7, 7) As Integer
Dim sr As IO.StreamReader = IO.File.OpenText("Distance.Txt")
Dim row, col As Integer
[Code]...
the problem is where i have the if statements that i have coloured red if i select southampton and london it will only display southampton to cardiff.
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Jun 11, 2009
I have been working hard lately to build a database and well i have been experimenting with SFD, OFD and lately Streamwriter. I have finished and got streamwriter working as i want it to but know i need to be able to open the text file where all the data is stored into the one label, and not have certain pieces of text.I have attached a example of what the writer makes. The text which i would like removed when i open it is indented to the right
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May 20, 2009
the default readline method of streamreader reads the text file from top to bottom how i can reverse it?from bottom to top?
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Oct 13, 2009
Well it would appear that you need to close IO.StreamReader every time you try and open a new document. So I have tried to do this a variety of ways, with no success. I am open to the option of having it check the same document for the Username, Password, and HWID. (Yes, I know that this is not in any way a secure method to gather data but their is a reason for my madness) Anyways onto the code, I removed the URL (Yes, I did check to make sure they were all valid and worked).
VB Dim wc As New Net.WebClient 'Downloading the list..
Dim hread As New IO.StreamReader(wc.OpenRead("myurl")) 'URL to the list
Dim uread As New IO.StreamReader(wc.OpenRead("myurl")) 'URL to the list
[CODE]...
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Mar 25, 2009
I'm trying to calculate the average hours worked from a set of data imported from a text file using streamreader. My problem is counting the number of entries and the total hours worked imported from a text file within a loop[.
[Code]...
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Nov 18, 2009
I'm facing this peculiar problem since the past two days and now it is driving me nuts.I initialize a StreamReader from a MemoryStream object. When I move the seek pointer to beginning, the first time it is OK, but from 2nd time onwards I see an extra bad character at the beginning of stream that obviously should not be there.This doesn't happen with StreamReader initialized with other constructors like directly passing filename etc.I constructed a small program to demonstrate this. I added 2 buttons to a form and this code. When I run this code, clicking Button1 shows extra character at the beginning of string after ResetSeekPointer() function has been called at-least twice. This doesn't happen when I click Button2
vb.net
Imports System.IOImports System.XmlImports System.Xml.XslImports System.Xml.SchemaImports System.Collections.Genericublic Class Form1Private myStreamReader As
[code].....
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Jan 14, 2010
I made my own advanced networking system which uses System.IO.Streamwriter and Streamreader but offline. I would like to let this use a directory online, I have a webhost available for that, now how do I say to the program it has to look at a specific map with all the users information?
I now have already this into my login form:
Private Sub btnLogin_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLogin.Click
On Error GoTo A
[CODE]...
Just curious if I can let my network grow out international instead of pc. Also I have a second question. I made a create account page which is supposted to make a text file with the txtUserName and txtPassword inputs, but it does create the file, but doesnt write any lines into it.
Code here:
Private Sub btnCreate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCreate.Click
Dim UserGenerator As System.IO.StreamWriter
[CODE]...
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Jun 1, 2011
i have a stream reader reading a csv comma delimited file, its skipping every second line though if i edit the file and enter blank lines in between, it reads them correctly
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Aug 15, 2010
I am in the process (slow process) if learning vb.net by trying to create a simple application that will read and write (save) chosen information to a text file. The application has text boxes (name, email address, etc) and I want to read information from certain lines in the text and place in the given text box.[code]When I start debugging mode it does not display the text until I click onto the text box and it's displaying the first line of text in the file. How do I skip the first line of text and have it display the second line (or the 6th, 24, or whatever line I need to be displayed)?Then I can start working on learning to use streamwriter
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Dec 29, 2010
I am looking at Visual Basic 2008 Step By Step. I need to read a flat file and insert the records into my SQL database. My code so far:
[Code]...
The INPUT line needs to be fixed. From what I can see, I need to move it all to a single field and use a split to parse it, correct? As I look at the entries on this site, all the code seems to use stream readers. Why would the book not do that? Am I missing something?
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Nov 25, 2011
I've got the following set up:On a webapp, I've got an updatepanel Inside this update panel, I've got two regular panels and a set of two radio buttons, radio1 and radio2.On Panel1, I've got 4 drop down lists (lets call it DDL group1), being loaded by the CascadingDropDown Extender, meaning the first box triggers the second, and so on. All 4 DDLs have autopostback enabled, meaning that every time I select a value, a SelectedIndexChanged method is called which loads data from a database, based on the information selected on the last DDL.
On Panel2, I've got the same set up, except that I've only got 2 DDLs (let's call it DLL group 2), also linked as cascading dropdowns. These also have SelectedIndexChanged methods.
[Code]...
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Jan 27, 2010
I've created an application that runs queries against a SQL server (via Data Adaptors) in VB.NET 08 and returns the results to a DataGridView. It works great and returns my data, but when I switch to a different query that returns different columns, the DataGridView keeps the old columns from the previous query and adds the new columns from the new query to the end (far right) of the DataGridView. Is there a way to counter this? I don't want those previous unused columns showing up in my results. I tried setting the DataGridView DataSource and DataMember to Nothing and that didn't fix it.
View 3 Replies
Jun 9, 2012
I have a DataGridView in which their is one column defined as a CheckBox. This checkbox is used to delete the record if the user chooses to do so. When they check the box, the user is prompted with a confirmation deletion message. My issue is that if the user chooses not to delete the record, I want to "Uncheck" the box and I can't get this to work. I've tried using the below code and it still won't work.
dgvBuild.Rows(e.RowIndex).Cells(6).Value = False
dgvBuild.Rows(e.RowIndex).Cells(6).Value = CheckState.Unchecked
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Dec 10, 2011
Like so many of your subscribers I am a (very) basic beginer.[code]Taken from Visual Basic.Net, for complete beginers. (page 67)
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Jun 10, 2010
Looking to make a simple VB form, that has three text boxs on it. One for a users username, and two for passwords. What I want to do is provide teachers with this form, they type in a students username, and if that username is found in AD it enables the two password boxs. Then the teacher can type a new password for that user in the boxes (the second one obviously being a validation) and then when they click save, it updates the AD account with the new password. Any ideas on how to do this? Does anyone have any code?
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Aug 17, 2010
If I have a double variable that goes through a loop and gets numbers added to it, is it just as simple as saying variablename = 0 to reset it?
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Sep 9, 2009
Usually, when I reset the IIS of a remote server, I have to use "Remote Desktop Connection", log in, and go to DOS , and type "iisreset". Now I'm wondering is it possible to do the exact same thing without using "Remote Desktop Connection" application? Could this be done programmitically and remotely (because the program will not be running on the actual server)? Of course, I'll be providing the username and password within the program.
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Dec 12, 2009
I have a form with lots of labels on it, and a reset button to reset them to a default text. This reset sub has lots of lines of code to get this done, but I think it cen be done in just a few. I thought of something like:
For Each Label In Me.Controls
Text = "0"
Next
but this doesn't work, or anything else that I've tried. how to do get this done? And what if I want half of the labels set to 0 and the other half to 1? Would that be possible without setting them all seperately?
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Dec 15, 2011
I have been coding a Reset Login Details form, the user needs to enter the new Username, the new Password and the Current Password.Here is my code below - something in the form is not working as i am getting an error when i fill in the form about the INSERT INTO statement.
Imports System.Data.OleDb
Public Class frmChangeLoginDetails
Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click
[code].....
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Mar 10, 2011
I'm storing data using my.settings (e.g., to use as a incremental counter). When I run my application it increments the value but, I do not know where to reset this value despite looking at all of the project files for them.
Is there a file that contains this data?
Note: at times during testing I don't want to reset the value(s) back to zero.
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