Threading Not Mastered / Still Having Ioexception Errors

Feb 13, 2011

I have been creating multiple background threads to parse xml files and recreate new xml files. Now the problem I am having is that even though I use synclock on global variables, I will still at times get errors and I am sure that this is just the crude way of coding I am doing, but I was wondering if someone had a better option. [code]I have global variables through out the app and should I be locking each one and does this not make using threads then useless.

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IOException Not Getting Thrown

Mar 4, 2012

I'm a learning VB.NET programmer that just ran in to some trouble. I'm creating a TCPClient/Server chat room application. When a client connect to the server, the server creates an object that represents the client and stores the reference to this object in an ArrayList. This "IndividualClient" object begins listening for messages, just strings, from the actual client program using a new thread that runs NetworkStream.Read. Now, when the client program is closed, the server-side IndividualClient object is supposed to throw an IOException at the NetworkStream.Read method, but this exception is never thrown, and I'm not able to catch it and handle the disconnecting of the client. With the client not disconnecting and never being removed from the ArrayList, all kinds of problems start to arise when the server tries to send a message to all connected clients.[code]

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Getting Unhandled IOException When Using Itextsharp ?

Sep 15, 2009

I am getting this unhandled IOException when using itextsharp

Rebuild failed: Error reading string at file pointer 3; Original message: xref subsection not found at file pointer 118

The line of code throwing this error is: Dim inputDoc As New iTextSharp.text.pdf.PdfReader(inputPath)

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Code(s)s To Catch Specific IOException(s)?

Aug 9, 2010

Does anyone know a link to a list of IOException codes or some way of catching a specific error?I have been digging for a couple hours trying to find a code, or a number to catch when my app throws

System.IO.IOException was unhandled
Message="The file exists. "
Source="mscorlib"

[code]....

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System.IO.IOException: The Device Is Not Ready?

Oct 12, 2011

I am developing an application that reads from a network shared folder on a separate Windows Server. When the application attempts to read, I am receiving the error message "System.IO.IOException: The Device Is Not Ready". I have tried running the application as an Administrator, however I still receive the same error.The files in question do not appear to be in use by any other application.

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VS 2010 IOException When Writing To A Txt File?

Jan 29, 2011

I have some code which writes the variables out to a debugging text file.

Try
Dim LogFileName As String
LogFileName = "log.txt"
objWriter = File.AppendText(DesktopPath & LogFileName)

[code]....

However when I run the code I get a IOException "C:Users***Desktoplog.txt" is in use by another process. the log is not open in notepad or any other program so what other process is using that file?

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ASP.NET UpdatePanel Timeout And 500 Errors With Custom Errors?

Sep 23, 2011

I have a .net application that uses customerrors web.config module to display meaningful messages for errors. It works without any issues for 500 errors/exceptions caused by non-ajax and ajax components (updatepanel). However, in a scenario where updatepanel's asynchronous request times out, there is no error raised at all. I was able to see the timeout in firebug and come up with a solution that would at least display the error message as an alert and then redirect the user to the 500 error page using javascript but it's not quite doing what the rest of the application does in case of an unhandled errors like these. I basically just want everything to go through "LogEvent" mechanism so based on the severity of the error, it does the necessary work.This 500 error page doesn't have anything in the Server.GetLastError() for these timeout scenarios. Is this an expected behaviour? Can it be changed so I do have access to these timeouts in Server.GetLastError() OR maybe just run this error through "LogEvent" mechanism? Is there a better/more graceful way to handle this issue?

Below is my code to give you an idea, not exactly what I have in my application but pretty close.

Web.Config
<customErrors mode="On" defaultRedirect="~/Errors/ErrorUnknown.aspx" redirectMode="ResponseRewrite">
<error statusCode="500" redirect="~/Errors/Error500.aspx" />
</customErrors>

[code]....

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Delete The Attachment But Get An System.IO.IOException Error

Jan 15, 2012

In the following Sub I'm sending an Attachment when the email has been sent I would like to delete the attachment but I get an system.IO.IOException Error. the file I'm trying to delete is being used by another process. How can I detect if the process has finished.

CODE:

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Deleting Attachment After Email Sent - IOException Error

Dec 29, 2011

In the following Sub I'm sending an Attachment when the email has been sent I would like to delete the attachment but I get an system.IO.IOException Error. the file I'm trying to delete is being used by another process. How can I detect if the process has finished.

Private Sub SendMail()
Try
Dim cfiAttach As Net.Mail.Attachment
Dim Attacmentfile As String = AttDir & fileName & ".pdf"
Dim SmtpServer As New SmtpClient()
[Code] ......

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System.IO.IOException When Creating A Test File

Aug 26, 2009

Determining the max filename & path size of the OS.zip I whipped up a quick app to test the max filename & path length for a chosen folder. It works gr8 except when I choose the root of the C-drive. When I do, I get this error:

[Code]...

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[2005] Saving And Loading Data: IOException?

Jan 18, 2009

I keep getting an IOException, because the file is apparently already in use. I'm pretty sure I closed every handle, and I don't know what to do.

High-Score
If haswon Then
Dim strFormat As New StringFormat()

[code]....

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_serialPort.Open(), System.IO.IOException In Windows 7?

Apr 17, 2012

I am receiving "A device attached to the system is not functioning" IOException in_serialPort.Open() in a Windows 7 PC (64 bits). The vb.net application is working ok in 32 bits and is compiled x86. In the device manager, the driver appears ok under Ports (COM & LPT) -it's a USB, CDC or virtual comm port.This exception occurs mostly all the time, but ocasionaly, few times, _serialPort.Open() has worked and the communication between the application and the hardware has been stablished. If the Pc is restarted and connected to the same port where the driver

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Could Not Complete Operation On Some Files And Directories (System.IO.IOException)

Apr 11, 2011

I get the following error message when i try to copy a directory using folder dialogue to get the path, into a predestined path. The code is as follows:

[Code]...

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Random Exceptions: System.IO.IOException: The Handle Is Invalid

Dec 27, 2011

I have a relatively simple VB.NET app. It targets framework 2.0 from Visual Studio 2010. The app works fine most of the time, except that the users sometimes receive the

following exceptions. The error is completely random and somewhat rare. I haven't been able to trap it while in a development environment. It also doesn't appear to be

pointing at my code. My app continues to run if the users ignore the error. How would I trap and handle this error?

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System.IO.IOException When Renaming Files - .Net 2.0 - Server 2003

Jan 3, 2012

I'm writing a short app that will send an email notification, rename files and move them to a history folder after a DTS package runs and creates the files. It's a simple setup, the files will be in a folder. I'm attempting to rename them, then move them. For some reason, I keep getting System.IO.IOExceptions when I try to rename the files. Here's my code:

[Code]...

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IOException Was Unhandled "The Process Cannot Access The File 'C:UsersacerDesktop EstFile.txt'?

Nov 9, 2010

Imports System.IO Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

[Code]...

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VS 2008 : How To Handle Disconnect : IOException Was Unhandled:Unable To Read Data From The Transport Connection

Apr 1, 2009

I am building a chat client/server. And I can connect and chat just fine, but when a user disconnects, the server does not recognize this and acts weird, often spamming the last message that was sent by the user..Also, it's like the client does not disconnect from the server even when I close the client app. Once I exit the program, VB acts like it is still debugging. Once the server is shut down however, I get this error:

IOException was unhandled:Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.

serverStream.Read(inStream, 0, buffSize)I don't know how to make my client and server accept the fact that a client has disconnected...

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Publish Build Errors (But No Errors In Debug Or Build) VB 2010

Jan 4, 2012

So when i build or click debug on my program. No errors come up and its smooth. So i decide to publish my programme. However. I come up with a bunch of errors during the publishing.

Here they are:Error 1 Cannot publish because a project failed to build. 1 1 Simple CALC

Error 2 Unable to copy file "binReleaseSimple CALC.exe.manifest" to "binReleaseapp.publishApplication FilesSimple CALC_1_0_0_0Simple CALC.exe.manifest". The specified path, file name, or both are too long. The fully qualified file name must be less than 260 characters, and the directory name must be less than 248 characters.

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A First Chance Exception Of Type 'System.IO.IOException' Occurred In System.dll

May 3, 2011

Brief of my project: Taking attendance using RFID reader and RFID passive tag. Main tasks:

1) Scan a Tag and Tag ID is transmitted to GUI.

2) Tag ID is matched with Student ID in database.

3) Successfully matched Student ID is displayed on GUI and LCD.

When i had experienced this problem, student ID was only display on UI but not LCD. After that, my system hang. This happened only when the data of tag scanned is taken from text file through OpenFileDialog. Manually add of data via UI just work fine.

[Code]...

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Error "An Unhandled Exception Of Type 'System.IO.IOException' Occurred In Mscorlib.dll" Deleting File

Aug 6, 2002

An unhandled exception of type 'System.IO.IOException' occurred in mscorlib.dll Additional information: The process cannot access the file "c:Fax524b2cfa00.tif" because it is being used by another process.

[Code]....

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Image.Dispose() Error "An Unhandled Exception Of Type 'System.IO.IOException' Occurred In Mscorlib.dll"

Oct 7, 2009

i am making an application that grabs an image from a folder, sets it to a picture box, then has the option to delete the folder... when i click the delete folder button i get the error:

[Code]...

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Asp.net - How To Use Threading

Mar 17, 2012

I am trying to send emails on a button click ...but I want to send the emails in the background as the number of emails are too many...so I am using threading.

[Code]...

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Implement Threading In App?

Sep 1, 2010

I have a program that I would like to implement using Threading.I wand to load a form that takes a couple of minutes to open using threading.Here is my code

Imports System.Threading
Public Class frmAdjustments

Function LaunchForm() As Integer[code].....

I am new to .net programming and could use any suggestions you may have. I'm trying to grasp the concept of multithreading apps and would like to have both my main form (Adjustments) and the (frmNewAdjustments) form to load concurrently.Here is the error I receive with the code above: Overload resolution failed because no accessible 'New' can be called with these arguments:

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Backgroundworker / Threading In WPF

Feb 21, 2011

i'm trying to do a database search in my WPF program. And to give the program some speed, I want to use Backgroundworker or Threading. The problem is that i have to invoke the controls that the new thread is going it access. But i don't know to do this and i don't know i which event to put the code. Here is some code:

[Code]...

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Best Way Of Multi-threading?

Mar 3, 2009

I need to be able to call a C++ dll that takes a long time (possibly infinte, it relies on user input)to execute. Im calling this through VB. My VB GUI freezes up when this happens, and I would like to keep the GUI responsive, so that the user can stop this possibly infinte loop. A bit of background, the C++ is trying to keep score on a snooker table using a webcam, and while the VB scoreboard updates easily, I would like to script it so that the analysis is almost continuous, while still allowing the user to interact. Currently the project requires the user to press a button to start the shot analysis, but it would be preferable if the program scripted itself. I have only realised this problem now and the deadline is very soon.

Update: Our lecturer suggested an option to solve the problem, but it would appear that most options here and the one he suggested will not work for us as the processing time required for the webcam image capture is too great to handle due to hardware constraints.

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How To Use System.Threading

Aug 15, 2011

I have the following code. My program loads 20 pictures in one panel and each pictures has for the moment like 500 Kb, but in the future they shall have like 2~6 Mb.When I use this part of code, my program that uses only 6 Mb of memory, but jumpes at 202 Mb when pics are loaded. I need a method to resize or make them thumbnail or something to reduce the memory.I don't know for the moment how to use the System.Threading, but I want to know if it shall help my program, if not, then help me replace parts of my code.Private Sub PanelPictures(ByVal picsoriz As Integer) ' picoriz represents how many pictures should the panel have on each row (it's set at 5 pictures per line/row) [code]

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Implement Threading In .net App?

Jun 8, 2011

I have a program that I would like to implement using Threading. I wand to load a form that takes a couple of minutes to open using threading.

[Code]...

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SMS Multi Threading

Jun 26, 2009

SMS Multi Threading

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Threading Along With VSTO?

Nov 16, 2009

I have a VSTO application, rendering a word documement. At each stage of the rendering a popup window is getting displayed. What we have done is displayed a popup window, and at each stage of the rendering the text is made Changed. I need to display the window using multithreading. How to achieve this.

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Threading And Db Connections In Vb?

Feb 23, 2011

I'm trying to understand how to handle db connections in a multi-theaded windows program.It I have this simple class:

public class MyClass
private myConn as new sqlconnection
private MyThreadPool(5) as Thread

[code]....

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