If I write this
Private Shared Function LeggeLogFile() As String
Try
Using fs As FileStream = New FileStream("MFile", FileMode.Open, _
[code]...
the second cose is correct? Exiting the Using routine I surely dispose both sr and fs?
I am trying to use filestream and streamwriter / streamreader to have a simple text box where the text entered is written to a text file, and then a button can be clicked to read the file and present the text back to the textbox. It works, but the problem I'm having is that if i change the text to something smaller in length (less text) than what is currently in the file, then press the button to read the file, it still contains some of the old text that was previously in the file.
Dim strmReadFile As New FileStream(txtPath.Text, FileMode.Open, FileAccess.Read, FileShare.Read)
Dim readHandle As New StreamReader(strmReadFile)
'read the entire text, and set it to a string
Dim streamFileContents As String = readHandle.ReadToEnd()
[code].....
I currently have a form, that has the following code in the close section.[code]It generates an error saying that the form has been disposed, despite only hiding the form.It would appear clicking the X on the form, automatically disposes of it.
View 5 RepliesThe goal is to write data to a SQL Server 2008 FILESTREAM file using VB.Net. An "Access Denied" message occurs when creating a FileStream object in the code(see red underlined code below). SQL Server 2008 is configured to "Allow remote clients to have streaming access to FILESTREM data" along with "Enable FILESTREAM for Transaction-SQL access"... What configuration setting is missing and causing the "Access Denied" message? Figure 1.) Code used to stream data to SQL Server managed file
[Code]...
I looked at the Dispose() method in System.Data.SqlClient.SqlTransaction (using a decompiler):
[Code]....
Why does everyone say in forums that it is Rolling back in the dispose? Where does it rollback?
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]......
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]...
I am attempting to read specific lines of GIANT text files (> 150 MB) with hundreds of thousands of lines. The files are contained on an FTP site. I can successfully open the files using FTPwebrequest and streamreader but to get to a specific line using streamreader, you have to read every line before it. Obviously this takes a lot of time when you need to get to the millionth line.
A much faster way, I think, would be to use filestream and the filestream.position function. However, I'm not sure how to open a file as a filestream from FTP. I have tried:
Dim ftpaddress as string = "ftp://####@ftp.textfile.asc+"
Dim fileStream1 As New FileStream(ftpaddress, IO.FileMode.Open, IO.FileAccess.Read)
I'm making a type of download manager which downloads parts of a file using HTTPREQUEST.addrange. The parts download without a problem and currently I use 5 instances of the same class to download the parts simultaneously each one downloading a different section of the file. Now my problem is that I don't want to save each part as a file then merge them later, I want to use a singular filestream and append everything asynchronously. In the code below I attempted to use the seek method but it feels like it changes the seek for all of the other parts as well.
[Code]...
i searched a bit but i cant find something useful.i need to take my files to filestream (i can do this with file paths)and i wanna save this files to somewhere else on my program. Is it possible that with the using FileStream?
View 2 RepliesI am trying to read in a file and store the byte position of each line read so that I can write out to another file the records in any order that I want. I am doing more manipulation of the lines, hence why I need the line position from the original file, but for simplicity sake, I am just including code to display the problem I am encountering. When I read in the file, I am getting the correct file position, but when I write out the lines, every 1024 characters it is re-writing whatever current line it is on. I am assume there is some buffer that is coming into play that I am not familiar with,
[Code]...
VB.NET application which allows user to split a file in smaller files. However the stand alone executable of the application,had a permission problem using filestream to read a file without an OutOfMemory exception, while selecting to split locatein certain directories like "C:".To solve the problem i checked My Project window and the "Security" tab, and i tried checking the checkbox: "Enable ClickOnce Security Setting" and selecting "fulltrust application". This added to my app.manifest these lines of code:
<applicationRequestMinimum>
<defaultAssemblyRequest permissionSetReference="Custom" />
<PermissionSet class="System.Security.PermissionSet" version="1" Unrestricted="true"
[code].....
I'm working on a project to extract documents from a SQL Database and writing those documents to a network drive. However some of the files pointed at in the DB are encrypted files (RijndaelManaged)that reside on another network driveI have been able to retrieve, and decrypt the files using streams. Now aving problems saving or converting the Memorystream into an actual file.
Here is my code
Public
Sub ExtractDocument(ByVal ThisDocumentInfo
[code].....
I am using BinaryFormatters (System.Runtime.Serialization.Formatters.Binary.BinaryFormatter) and FileStreams (System.IO.FileStream) to perform simple Open, Save, and Save As commands. I am using a separate FileStream and BinaryFormatter in each method.
My issue is that there is a delay for between four and ten or so seconds after performing any of those abilities before you can perform any other of them. Apparently the file is open in "another process", which (my guess) is the FileStream.Let's say I save and close a file in my app. I then go File > Open and select the same file and go to open it. I get that error returned.This isn't really an issue with the code, it's more me asking what the reasons are for why this is happening. What would be a way to work around this?
I have a filestream, and I want to save a file from that filestream? Like there are bytes in that file stream, and from those I want a "file.exe" to automatically appear on my desktop.
I'm using a code snippet, and I think this is the important part:
Dim fstr As New FileStream("file.exe", FileMode.OpenOrCreate, FileAccess.Write)
fstr.Write(validArg1, validArg2, validArg3)
fstr.Close()
Do I have to use a for loop? Or is there a function like this:
IO.File.WriteAllBytes(myPath, fstr.AllBytes)
Filestream URI format not supported?
View 3 RepliesI am trying to build a resource file for a website basically jamming all the images into a compressed file that is then unpacked on the output buffers to the client. my question is in vb2005 can a filestream be multi threaded if you know the size of the converted file, ala like a bit torrent and work on pieces of the filestream ( the individual files in this case) and add them to the resource filestream when they are done instead of one at a time?
View 2 RepliesThe file read is a mp3 or wav file.But my code Comb_Audio_Length, cannot determine the bitrate correctly as different mp3 and wav file have different bitrate....How can I read the bitrate value so as to calculate the audio length correctly?
Dim fs As FileStream
fs = New FileStream(strFilePath, FileMode.Open, FileAccess.Read)
Dim filesize As Int32
[code].....
making a WCF service before or do know anything about them, so this should be pretty simple. I have to get this "program" to take an excel file from a folder, and send it to this service but I keep getting this very specific error message:
The remote server returned an unexpected response: (400) Bad Request.
Probably one of the most specific error messages I have come across in my days. This is my code for the program, and what I have as his "service reference".
vb
Imports System.IOImports System.ThreadingImports System.Net.MailImports System.TextImports WindowsApplication1.ServiceReference1Imports SystemImports Microsoft.VisualBasicPublic Class Form1 Const Processfolder As String = "C:TestScottsCrap" Const Processedfolder As String = "C:TestScottsCrapCrap" Const ErrorFolder As String = "C:TestScottsCrapError" Private Sub Button1_Click(sender As
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My goal is to upload a string to a txt file on an ftp server.Here is what I have found so far:
vb
Dim clsRequest As System.Net.FtpWebRequest = _
DirectCast(System.Net.WebRequest.Create(RemoteFilename), System.Net.FtpWebRequest)
clsRequest.Credentials = New System.Net.NetworkCredential("usr", "pw")
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Is there a way to convert a String into something that clsStream.Write will accept?
I have an HTTP Handler that is binding an XmlTextWriter instance to Response.Output like so...
Sub GenerateXml(ByRef Response As HttpWebResponse)
Using Writer As New XmlTextWriter(Response.Output)
' Build XML
[code].....
I'm trying to write a file in chunks in a loop but the filestream.write just causes the sub to end the second time round but the first chunk it written and the savefiledialog remains?
edit: I was using an offset which I shouldn't have so now it writes the file just fine but the savefiledialog doesn't close itself?
Here's the catch - for the program I'm making I would like to avoid creating a copy of the file in its totally unencrypted state (I'm using a modified, quick-and-dirty XOR cipher for that. It's secure enough for my purposes and faster than the stronger encryption). Anyhow, what I would like to do is read a block of data, de/encrypt it (in memory) and then write the changed bytes to the same location they previously would have been within the file.
I've found the problem a little outside my programming abilities, so I was wondering if anybody had a pre-made solution, links to appropriate examples, or an all out explanation.
Here is some code I am trying to use to read a UShort and UInteger from a filestream[code]...
View 2 RepliesI am trying to replace an existing bitmap using a filestream. I can do it once, but if I try to replace it again, using the same filestream command, I get the following error:
"The process cannot access the file 'F:\base.bmp' because it is being used by another process."
Private Sub btnSquare_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSquare.Click
Dim image As New Bitmap(pic.Width, pic.Height)
[Code]....
I have trouble accessing filestream via SqlFileStream. Sql server and IIS7 are on different servers, remote access to Filestream is enabled. Workgroup for both servers is the same.I've tried everything, including opening user with identical username/passwords on both servers. Didn't work. Dim sqlFileStream As New SqlTypes.SqlFileStream(filePath, txContext, IO.FileAccess.Read)I have both filePath and context.However, when I open server via explorer logged on locally as Administrator, I also get access denied if I try to acesss this share.Can permissions for this share be edited at all?
View 2 RepliesI am writing a program to upload file to the web using Socket and FileStream. Here is the code
Private Sub Read(ByVal state As StateObject)
Dim filestream As FileStream = state.fileStream
filestream.BeginRead(state.readBuffer, 0, StateObject.readBufferSize, New
[Code].....
I have a button on form 1. When the button is clicked, form 2 pops up. Form 2 also has a button.
Code for form 1:
Imports System.IO
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim textfile As New FileStream("textfile1.txt", FileMode.Create, FileAccess.ReadWrite)
Dim txtfilewriter As New StreamWriter(textfile)
[Code] .....
Now, as you see, on the form 1 load event, the streamwriter writes "Physics" to the text file. When the button on form 2 is clicked, the streamwriter writes "English" to the same file. As an end result, I expected BOTH "Physics" and "English" to be in the text file but the final result is only "English" in the text file. What do I have to do so that the textfile continuously stores these lines?
can someone help explain to me how this code knows where to write the file too? I want to modify it to write another schema file to a different folder location [code]I need to write the 2nd schema to j:Solds folder but dont know how to get it to the folder it writes to just.[code]I know how to re-write this with streamWriter but I am looking to understand how this piece of code actually knows the location to write too
View 4 RepliesI wrote a vb.net program that can view the documents It uses a reader and decompresses the sql blob to an outputStream and displays the document after a Response.Flush.We sent the code and databases to another group to host this website themselves. They can run the website but when they view the documents the documents open with a page full of small squares.
View 1 Replies