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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May 13, 2012
This may be a debugger issue, but here goes:I have this piece of code:
Private Function Connect() As Boolean
Try
sessionBegun = False[code].....
My intention is to 'convert' the low level exception into something more meaningful, so I throw an exception of my own creation. I want this to bubble up to a place where I can handle it.However what is happening is my debugger breaks and tells me that an exception of type "QuickBooksConnectionException" was thrown.I know that, I just threw it, why are you catching it? From what I've read, this ought to work, and there doesn't appear to be an analogous Java throws keyword, so perhaps it is my debugger.
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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Feb 26, 2009
The Exception is not thrown in the following code in Visual Basic 2005, if sqlserver 2005 is down.[code]...
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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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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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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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Apr 20, 2011
I'm programming a slideshow in Visual basic and get a SystemInvalidCastException when trying to initialize an array through a For Each loop. Here's what I'm trying to do. I have an array of Images() and another array of ImageNames(). Now I store all my images on a website, let's sa so for ease of use, I've named all my images in this manner
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Aug 5, 2010
I have a log table where i need to insert the query which causes errors in the code. I have a common function "WritetoLog".[code]My Question is from the ex how do i take the query which causes error. eg. If the insert command is giving exception i should get like this SQL Query causes error : Query + ex.Message..SQL Query causes error : Insert into temp("1",'Anitha','TeamLeader',) + Incorrect syntax near ')'
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Mar 22, 2012
I'm working on a status monitoring program for my company and we need to be able to know if a process on a remote machine is hanging due to not responding (that I can do) or if it's thrown an unhandled exception. I've tried a number of things from checking the CPU usage of the process to checking if the process has gone idle. Nothing has really been reliable. Is there anyway to do this? All the programs we'll be monitoring are running on either .NET 3.5 or 4.0.
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May 15, 2006
I've developed program w/ VS 2005 .net 2.0.... the program works great on all my customers computers, except for one. Immediatedly whenever opening the program he recieves a clr20r3 error and the process terminates.
I compiled a version of the program that put a simple msgbox that displayed "I'm working right now" first thing in the sub that handles me.startup. The program doesn't even get that far. I've tryed repairing .net 2.0... and completely uninstalling 2.0 and reinstalling it.
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Jan 15, 2012
I'm working on an application that contains a "BackgroundWorker", the "BackgroundWorker" worked fine but after I started to change some stuff it gives me an error ("Exception has been thrown by the target of an invocation.")... I used a breakpoint to see where it happens, the exception gets thrown at the "End Sub" line of the BackgroundWorker.I then deleted all the code inside of it and ran it again.I still get the error.
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Feb 27, 2009
What is the meaning of this error message?
"Exception has been thrown by the target of an invocation"
Instead of words, here is my code's logic :
while loop
run BGworker01
run BGworker02
...
run BGworker09
application.doEvents
thread.sleep(10)
end while
All the bgWorkers do the same thing (sending some data, only to different locations). When I run this loop with only 1 Background-Worker, it's all fine, but when I add the other bgWorkers i get the mentioned error at the "application.doEvents" part of the loop. I think it also points to another place (highlighted in green) inside one of the bgworker's code :
Dim FileStreamToSend As FileStream = New FileStream(fileToSend, FileMode.Open)
I thought it might be a problem that all bgWorkers are trying to read from the same file together, but when I tried using different file for each bgWorker, the problem persisted.
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May 28, 2010
I want to use mozilla control in my application.. But when i use Webbrowsercontrol i just use
webbrowser.navigate("http://www.google.com")
but this commant is not working with mozilla control ant when we try to navigate to any web address it gives following exception.
Exception has been thrown by the target of an invocation.
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Jan 21, 2011
I know this is a relatively common error but I am working in an application that allows custom reports to be written using vb.net or C# for scripting. Error handling is very poor and I am not knowledgable enough to add my own (if it is even possible).
My code simply retrieves a value that is stored in a textbox on the report formatted as LastName, FirstName and truncates all characters after the comma. This value LastName is placed in a new textbox on the report. Here is my code:
Sub Detail1_Format
Dim lastNameFirstName As String = ""
Dim lastName As String = ""
[Code]....
The error happens when I use lastNameCommaIndex to set the number of characters in my substring. If I replace it with a number the report is published properly.
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Aug 15, 2011
I am writing a program that saves quotes for writers to an xml file. Well I save my data to the xml file, but when I go to load the document I get this exception thrown at runtime.
System.Xml.Xsl.XslLoadException was unhandled
LineNumber=2
LinePosition=1
[Code].....
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