Cannot Access A Closed File
Sep 8, 2009
I can't understand why I'm getting this error. I'm trying to parse a tab seperated file. After 10 lines being read it throws the above error which is an ObjectDisposedException.
Public Function readNextLine(ByRef buffer As Single()) As Boolean
Dim i As Integer
Dim tempString As String()
[Code]....
I can't understand it, it's called and operates fine for the first 10 iterations and on the 11th throws and error. There is nothing special about that line in the log file.
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Dec 19, 2009
I have some programming background in VB4,VB6, and some assembler, also I was a very big fan on of Qbasic.Programed 100's PIC micro in assembler and basic.
I know this list of experience will put a big smile of many readers face, that's what I have.Trying to learn VB2008 Express, I find everything I know is out of the window, nothing works the way it used to be.Cant find solution for the simplest task, like read/write a file in binary, read/write serial port.I have some e-books to read, all talks about thinks are actualy works and I could figure out myself or other case I cant get around what era they talking about.I'm cursing right now, ho would you teach a old dog for new trick's.English is my second language, not always understand all the terms and other lings what books and online sources use.I have not wrote any code for Windows for at least 5-6 years, but did wrote may program for Micro controllers in Assembler and Basic.
For example I found this code to demonstrate how to create a file, write in binary then read it back.It does not work, cant figure it out why, help is useless, stops at "fs.Position = 0", the function of this line make sense, but why errors out here.Debugger give me "Cannot access a closed file.", I don't see any line closing the file, is everything will be this difficult.Not to mention this is pose to be a working example from a book.This is the way I used to open a file.[code]...
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May 31, 2011
for example i have this code :
Sub Month()
Dim Conn As New Data.OracleClient.OracleConnection
Conn.Open()
Try
Dim Cmd As New Data.OracleClient.OracleCommand
With Cmd
[Code]...
What will happen to the datareader when the Connection is closed ( Conn.close)
Will the Cursor that is used by the datareader be freed ? or will it stay open ?
If the cursor that is used by the datareader is still open , when will it be automatically closed ? or should i just closed it manually ?
Will it cause the dreaded "ORA-01000: maximum open cursors exceeded" ?
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Jun 17, 2010
I'm testing out the use of shells and I want to know if theres a way to check if the shell is exited.
[Code]...
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Apr 11, 2012
Private Function GetImageSize(ByVal FileName As String) As Size
Dim ImageSize As Size
Using BR As New BinaryReader(New FileStream(FileName, FileMode.Open))
Do
[code]....
I want to display photos of people when the mouse passes over their name. I wanted to be able to size the picture box to be proportional to the various photographs and let the Stretch property handle the rest.I used the code above offered by John Wein to a question from 2009 to read the dimension of the picture It worked fine until I pass over the same person twice. Then I get an error that the file is in use by another process.I tried adding:
"BR.Close"
With and without
"BR.Dispose"
But the file is still locked-out on the second pass. I tried setting "PictureBox.Image = Nothing" when the mouse leaves the square, still the file is seen as in use and locked.
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Jan 10, 2012
I am trying to delete a file after viewing it. I loosely copied the code from [URL]. The problem I am running into is the filename I am passing is still in use after I close this form. How to get id where the file is being held open. Here is the relevant portion of the code. This is how I am opening it
Private Sub TifViewer_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
PicImage.ImageLocation = PassedImage
PicImage.SizeMode = PictureBoxSizeMode.Zoom
cboFrameNo.Items.Clear()
'Sets the tiff file as an image object.
[Code] .....
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Dec 3, 2009
Using VB.net 2008 .net 2 to create an xml file from a dataset After the writexml statement the file is created OK When the stream is closed the xml file gets deleted?
code
Dim
dssettings As New DataSet("SAMSettingsDS")
Dim tblsettings As New DataTable("SAM")
[Code].....
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May 20, 2009
So I am having a situation where sometimes my code will error saying the file is already open (the text file). It happens randomly, and I'm assuming it's the computer hanging. Is there a way that I can make the program "wait" for the file to close?Here is the code that I am working with:
[Code]...
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Jul 8, 2011
I'm using the code below in a separate (background) thread, in order to read parts from a file, so they can be uploaded.
The problem is that when the user stops the upload, the thread is sometimes aborted while it's still reading from the file. This keeps the file locked and when the user starts the upload again, the following message appears.[code]...
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Mar 17, 2011
I am reading a large number of XML files and do not want my program to bomb on exceptions. I am making great strides in reporting the errors, skipping the offending files and continuing the import process. However I am having problems with XmlExceptions. I get the following XmlException on the While textReader.Read() line of my program:
Quote:
XmlException was unhandled
Unexpected end of file has occurred. The following elements are not closed:
my:PicInsert, my:PictureGroup, my:myFields. Line 153, position 430817.
I am finding some of the reasons why, missing tags etc, but those aren't really my concern. I just want to report the issue and continue. I am thinking about some kind of check for a valid xml file but fear that that might not catch it all. For example I had a image tag in one of the files that was missing an alt="" attribute and I am not sure if that would invalidate the entire XML file.What would be the best way to trap and deal with the exception with out causing interuption to the program?
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Jun 10, 2011
I am trying to parse incoming data from a serial port that appears to be XML format but an exception is thrown when I switch from a simulated setup to the real deal.My program runs great in a simulated setup but when I try it out on the real device I get: XmlException was unhandled Unexpected end of file has occurred. The following elements are not closed: li840 line 1, position 9.The li840 tag is my root tag and the position never seems to get past 40. I've tried using a try catch block but in my in both my simulated and real setups my values are blank but the program will run without exceptions. Should I take my received data and put it into a file and then read from the file? or is there something else I can do to make this work properly? [code]
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Mar 21, 2012
Pretty much the only thing I have changed is created a loop because I have one xmlstring and want to break it up and create tif files from it(which it actually does do).My problem is this: readbytes inside the while loop throws an exception at the last time through the loop that says I have an "unexpected end of file; the following elements are not closed" and lists them
[code]...
So there are tags left open after the readtofollowing("image"). I tried catching the exception to no avail, tried to read until eof, no avail. I dont really need elements to be closed, I just need to continue because I created files using whats in the image tag.EDIT: I think my xmlstring is going to have times where it will be too big to do a parse without slowing down too much.../parsing binary data?
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Nov 12, 2011
I have a 'next' button which changes the questions when clicked. How do i make the questions keep changing to another question from a file with only 1 button when clicked and also display it on a label with 4 radio buttons with answers in vb. I always get an error " Cannot read from a closed text file "
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Apr 25, 2011
I'm trying to create a program, that upon opening, will read an input file containing a delimited employee record. The record will contain the name of the employee, their salary and the number of years they have been employed.I'm looking to display only the name of the employees in sorted order(alphabetically) and then when the user of the program selects a particular employee, I want to display the salary and number of years for that employee.I would like the user to be able to edit the recors for the employee and I would also like to have a way for the user to be able to add/remove an employee record and update the input file before the program is closed.
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May 27, 2011
I am writing a very simple program that connects to a accdb file (Microsoft Access 2007 file) and returns some results in a datagridview. Everything is fine. Now because we have to deploy this program in many computers i publish it so everyone we want can install it and have updates. What i wanted to do is to make the database file part of the program which i did it by adding it to the resources. My problem is that i do not know what connection string to enter in order to access it in my resources.
My previous connectionstring before i deploy it was this
ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:l.accdb;Persist Security Info=True
What should i change in the data source in order to access the same file in my resources?
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Jan 7, 2009
I am writing a program to calculate Pi to several hundred billion decimal places and this will require lots of GB of memory. I wrote a test program in VB2008 that saved the first 16 digits of Pi (without the decimal point) to both a text file and a random access file, just to be sure it was outputting the numbers properly. For reference the first 16 digits of Pi are:
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Oct 19, 2011
Years ago when coding with VB6 and earlier, I used a file open command to create, read, and write a file that made it easy to store useful information.I believe it was binary and you wrote/read the data to a specific line in the file. When you opened the file with something like notepad, it just showed random ascii chars. When I needed a line of data, I could specify what line to load it from.
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Jun 25, 2011
on my program i have an activation in it and in order to activate the program you need to enter a code that is stored in the settings. so i was looking through my computer and i found the programs config file. and so I opened it and i found all of the codes for the activation. I need to find out how to make the file so the user doesn't have access to it and then how to move it to a more hidden place in the C: drive.
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Sep 28, 2010
I have a laptop with windows 7 and I am trying to make a program for it. I want it to do is after a certain time of day when I close the lid of my laptop it will make it go to sleep. But at every other time of the day I want it to stay awake when I close the lid.
I have been looking all over the internet and i don't understand what people are saying.
If anyone can tell me a way of knowing when my laptops lid is closed in vb.net that would be fantastic.
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Feb 21, 2012
I have the following snippet in the load event of a MDI child:
Try
foApplRole =
New ApplRole
ugRegionUser.DisplayLayout.Bands(0).Columns(
"User_ID_C").ValueList = uddUser
[Code]...
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May 23, 2011
I am trying to create a locked down browser for the employees at my work to use at a kiosk. I need to prevent the user from getting out of the app. I have figured out how to prevent them from closing it by pressing alt-f4 or ctrl-f4 but I would like to also prevent alt-esc, ctrl-esc, alt-tab, and the windows key. I am new to windows application development but have experience in web vb.net. I am using VB.NET 2010 express.
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May 18, 2012
i make progran used vb.net 2005K anf then instal this program in tow computer and work withot any problem
then i install this program in third computer but when i try to open by click the massege appear ( program name has encountered probleam and need to close )
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Sep 19, 2009
Trying to move from an Access MDB file to an SQLExpress(2005) MDF file and getting lots of problems. I have model my MDF file Like my Access MDB file ,same file name,same number of columns, same columns property,same columns name, see out of the 13 columns 8 have default value, I think I am getting a syntax problem when inserting the data into the table, being new to SQL Express I don't know how to write the proper SQl syntax
See my code for inserting and updating (using Access.mdb) which I whoud like transpose to SQL
'// Insert a record into the database for the node.
sSql = "INSERT INTO [TreeViewItems] (bRoot, dLastModified, iImageIndex," & _
"iParentID, iSelectedImageIndex, iSort, sName, sFullName) VALUES " & _
[CODE]...
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Apr 28, 2010
i have a problem where i've hard coded the file path of an access database i'm using with a VB.net program. this means that if i publish the program the database doesn't publish with it and i have to "ship" the program with the the database file separately and create another form so the user can say where the file is held. i don't want to do this.is there any way to get the access database file to publish with the program and then access that file path by code? for example the database file is held in the same folder as the installed program and then is accessed by code so there is no need to use a specific file path.
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Apr 17, 2012
I am using net 2010 net framework 2 & w7 In windows explorer I want to move or rename a file but I get a windows message with a heading "File Access Denied" you need administrator permission to do this In my vb code I want to move the same file but get an error, the security on the file is "Read & execute" and "Read" How do I detect this before the code for moving & also set the permissions so I can move it with vb code.
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Sep 18, 2009
I have been trying to open a solution file downloaded from my class for the past two days. When I open the assignment file on my destop to access the solution file, it's not there. I have the variables design, obj, bin, and others but not the .sln file which is the one that I need. How can I fix that problem?
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Apr 7, 2007
I encountered the error:The process cannot access the file <full file path> because it is being used by another process.during System.IO.File.Delete(filename)I have opened the file using:pctPhoto.Image = Image.FromFile(filename)before I delete the file.
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Aug 22, 2011
I try to map to the network drives and i am able to read the number of folders in the drives and access right for FULL CONTROL ( READ , write etc. ) is given to me and in fact "everyone in the same domain group that i am in. However i encounter the following code error where FileOpen(1, ReadString, OpenMode.Binary) --> It prompts that access to the path of \xxxxxxxxxfolder is denied.
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Aug 2, 2010
I am using the visual studio 2008 but use the guide for 2oo5 .I wonder why the program show error after click the load button (btnload). I am following the http: [URL] and having problem with the 'Filling the DataSet'. Is it because of different version?
The code I use:
Public Class Form1
Private Sub Ordered_booksBindingNavigatorSaveItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Ordered_booksBindingNavigatorSaveItem.Click
Me.Validate()
Me.Ordered_booksBindingSource.EndEdit()
[Code] .....
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Nov 7, 2011
I have a Visual Studio 2008-SQL Server 2005 app that will be throwing alot at it. It's my testbed learning app. I'm also a student of this craft(43 years young) like another poster posted on another thread. I come from a PICK/BASIC jBase background. Anyway as-is my app has a connection to the database that is opened on form load. I close the connection on form close. It's a one form app currently. Is this wrong? It seems that maybe I should not have a connection opened possibly all day. I'm looking into incorporating Datasets, dataAdapters into my next phase of evolution. I looked at the material and it's tough. For me anyway. But I will get into it. I will fetch the data into a dataset so that I can keep the connection open only for a little while. I was turned on to this "keep the connection just as long as you need it" idea from someth
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