VS 2008 Data Corruption With StreamReader Initialized From MemoryStream?
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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Sep 26, 2009
I have a problem with an application I have written. To keep it simple, it does heavy math calculations. If the results meet a specific criteria, it is written to a text file on a line-line-basis.The problems is, if I go look at the data files, I will find non-numeric symbols mixed in with the numbers. Sometimes it is a question mark, "?". Other times, it is control or extended characters that Notepad or Wordpad cannot display. They can be mixed into the numbers, like so: 215x7 or 8948x, where "x" is the odd character. I thought the problem may have been my use of "DataFile.Flush". I removed that, but still have the corruption.
Below are my declarations and code fragments:
Dim Number as ULong
Dim DataFile As System.IO.StreamWriter
DataFile = My.Computer.FileSystem.OpenTextFileWriter(FilePath & fName, False)
DataFile.WriteLine(Number)
The first time I had a problem, I thought it was my use of "Cstr()" in the WriteLine statement, with "Flush" as I stated above.I do not know if this is a situation internal to VB2008, or external, like hard drive buffers writing.
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Jun 30, 2011
I have a Linq query on the server side of a Silverlight 4 Ria project that returns a number of distinct items based on a time period(Month).The problem I am getting is when the client callback fires the data has been corrupted and all the items returned from the server are duplicates of the last item in the collection.
Server Call
Public Function GetBusinessHeadCountHistory(ByVal businessUnit As String) As IEnumerable(Of EngineeringHeadCountBusinessHistory)
Return From t In ObjectContext.tblTimes
[code]....
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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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Apr 16, 2009
Ok i have an issue that i have reported before but never had a satisfactory result to so time to try again. and im just about ready to throw this whole visual studio nonsense in the trash, ive wasted god knows how many hours on this now. I have a medium sized VB.net (2008) project, which has around 50 Datatable adapters that i have setup in the dataset designer, and are all workign perfectly well.
[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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May 19, 2009
Is there something that needs to be done with the following code to release the memory it uses?
Dim objImage As MemoryStream
Dim objwebClient As WebClient
Dim sURL As String = Trim(m_StationInterface.PicLocation)
[Code].....
The code is on a popup form that shouldn't ever get disposed. A new image is loaded onto the form every time it pops up. However, the process size for the application continues to grow each time it makes it through that code block.
I've tried objImage.Close() and .Flush(), objWebClient.Dispose(). The process size still grows by a good 4mb after every call. It's like the old image is kept in memory.
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Jun 24, 2011
I'm attempting to use symmetric encryption to encrypt some data, and store the key necessary to decrypt with the data in a MemoryStream. (While I know that this alone is really dumb security-wise, I'm going to use RSA to encrypt the symmetric key. Right now, though, I'm trying to just get this part to work.)I'm using the FileHelpers library to parse the data for my delimiter (the semicolon, as I don't believe I'll ever have a semicolon in the data). Unfortunately, in my decryption function, when it's parsing, it only returns back one record. And, if I show the entire string of encrypted data created at the end of this function, it doesn't appear to be using multiple records.I'm wondering if when I create the new cryptostream, it's defaulting to the beginning of the memory stream, so when I write my encrypted data, it overwrites the data I had just written to the memory stream.[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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Apr 25, 2011
I am trying to insert the information from comboxes, check boxes, and date and time picker. I am getting the following error when I hit submit button. "ExecuteNonQuery: Connection property has not been initialized. - system.data" I am sure I am making some silly code mistake that I am not able to figure out.
Dim icount As Integer
Dim SQLstr As String
Try
SQLstr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:ADAccountDel.mdb;"
[code]....
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Jan 26, 2011
I have 2 datetimepickers. I want to run a select statement between startdate and enddate. When I run the project. I get the error: "The Connection String property has not been initialized." [code]
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Feb 12, 2012
Im trying to send a Docx file via this form that I made, the email sends fine.but the docx file gets back corrupted.. this is my backgroudn code:
'Add the namespace for the email-related classes
Imports System.Net.Mail
Partial Class SendAttachment
Inherits System.Web.UI.Page
[code]....
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Aug 26, 2011
I am reading csv file via streamreader. Issue is that in csv file if if the data is like "Read" then steamreader the same data is coming as ""Read"". How to remove this extra inverted commas?
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Feb 9, 2011
when the codes below is run, when it loses focus, the error 'connection String Property has not been initialized' shows and when i commented on the lost focus section, and click on saving, the sme error shows and ' da.Fill(ds, "Branch")' is highlighted.
[Code]....
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Jan 3, 2011
As part of the application I'm writing in Visual Basic, I have written code to display records in text boxes and cycle through each of them one record at a time. I'm having trouble getting the code I've written to update records to work however.
VB
Public Class frmRecords
' VARIABLES TO AID NAVIGATION THROUGH RECORDS
Dim moverow As Integer
[code]....
At the present time I get an error that says "The DataAdapter.SelectCommand property needs to be initialized"
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Nov 26, 2010
I want connect to dbf file.
________________________________________________________
Imports System.Data
Imports System.Data.OleDb
Imports System.Data.Odbc
[code].....
The warning is: ExecuteNonQuery: Connection property has not been initialized.
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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 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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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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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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Feb 10, 2010
we consistently get a file corrupted error message when opening a docx file from a saved bytestream, evry other file type works just ok
Below is code from a sample form that replciate the issue
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
'Objective is to be able to copy a file to a bytestream then create a new document from that stream and then opne it.
[Code].....
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Feb 15, 2012
I am making a simple application that will be able to store competition data into a text file that I have given a custom extension to on saving. Here is an example of the format that i have saved the data in.
Code:
[Comp_Name]Test Competition[Comp_Name]
[Location]Silverwood Lurgan[Location]
[Type]Teams[Type]
[Code]....
When i open the file, i want to redisplay the data in separate text boxes. Later on in the project i want to be able to search within the file for headings for example;
if "[Heat1]" is present then get all text between [Heat1] and [Heat1]
i am currently able to use the streamreader and open file dialog to retrieve the entire string of text fromthe however i am not sure how to go about getting the text between the headings I have used.
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