I am creating a programming that is sending info for one pc to another over RF. The desktop show create a xml file. It writes some of the info but not all. I receive a Target Invocation Exception Error. I realize I need to slow down the incoming Data. I want to use a timer to slow it down.
View 4 RepliesIt errors often (not in a system damaging way) but enough that it bothers me.
Code
Public Shared Sub Fire(ByVal thisEvent As [Delegate], _
ByVal ParamArray args() As Object)
[code]....
Common Error
User Message: Async event fire error.
Error Type: System.Reflection.TargetInvocationException
Error Message: Exception has been thrown by the target of an invocation.
[code]....
When a delegate method throws an unhandled exception, that exception is usually trapped at the level of invocation (eg. Delegate.Invoke()) - you get a System.Reflection.TargetInvocationException...
However, when debugging classes utilizing a lot of threading/invoation, it would be helpful to be able trap the exception in the target method i.e. the faulty code, and since Microsofts BackgroundWorker (exceptions thrown in DoWork()) is able to do it, why can't I???
I have a vb6 app, the error from event view is Faulting application vb6.exe, version 6.0.81.76, stamp 3592011f, faulting module vba6.dll, version 6.0.0.8169, stamp 358b0c74, debug? 0, fault address 0x0001982e. For more information, see Help and Support Center at [URL] And a message box pop out. Exception has been thrown by the target of an invocation. The code is
[Code]...
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.
View 12 RepliesWhat 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.
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.
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.
Currently I m working in backgroundworker .but suddenly it begins to throw an exception
Exception has been thrown by the target of an invocation. source:mscorlib
stack trace :at System.RuntimeMethodHandle._InvokeMethodFas
I have a winform where I have some controls like TabPane, Label, ....When I launch my application without localization, it works fine. When I put localizable parameter True, I have this error :
TargetInvocationException was unhandled
Exception has been thrown by the target of an invocation.And when I debug my application, I follow the execution, program begins executing InitiliazeComponent(). I press F11 to continue the debug, program executes the TabIndex event of my TabPane and on the first instruction it crashes.My environment is VS2008, Framework 3.5. I store my project on a network hardisk (I test on local and it doesn't work too)
"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
[Code]...
When I click the VS 2010 icon to open it I get a popup box error "Exception has been thrown by the target of an invocation". I then need to right click the icon, click "Run as.." change "Current user" to "The Following user" then enter in my windows credentials and it opens fine. This is happening suddenly (Windows XP) and I don't know why. It wasn't happening before and I haven't started logging in with a different user or anything.
View 3 Replieswhat is this error " Exception has been thrown by the target of an invocation."the code is :
Private Sub Button10_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button10.Click Button10.Enabled = False
Label19.Text = "Checking for updates .... "
WebClient1.DownloadFileAsync(New Uri("http://www.fileden.com/files/2009/8/20/2549735/virson1.txt"), "virson1.txt")
End Sub
[Code]...
I am using a background worker to process some login information. However, the background worker has to stop and wait for 2 events to happen. Once these have finished the background worker can complete its job. They are callback that will call the Set() method of the AutoResetEvent.
So I am using AutoResetEvent to set when these 2 events have finished. However, I seemed to be getting this error message
"Exception has been thrown by the target of an invocation." and Inner exception
"Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index". The exception usually fires when the registration success leaves scope.
The code for the background worker.
' Waiting for 'Account in use' and 'Register success or failure'
Private loginWaitEvents() As AutoResetEvent = { New AutoResetEvent(False), New AutoResetEvent(False) }
[Code].....
Recently I created a Windows Form database project in VS 2010 and it worked great.I am now trying to port this project into VS 2008 (Using VB.NET in both btw).When I run it in VS 2008 I receive the following error message:[code]
View 1 RepliesI know that time delays have been covered before around almost everywhere. however a method that forgoes forcing the GUI to become temporarily non-responsive, is all but a myth, or at least to my findings. i have the need for a GUI program to delay before the next command, however using the current method, detailed following, it causes the desired effect however it dose make it much less polished as when you click anything else on the GUI it goes un-responsive for the directed time. [Code] make a sub called say Tdelay( milseconds as integer) and have it run a loop as many times as the milseconds variable indicates and each time making the thread delay for 1 milsecond and then update the GUI/form in some way, then re-loop.
View 7 RepliesI have a large project where we have 2-3 dll projects that are converted from VB6 to VB.NET. We have fixed all the issues that caused compilation errors, and most of obvious issues in running, so now we have basically a program up and running. The exe is created from scratch in VB.NET, using a lot of functionality from the converted dll's (including GUI forms). What I wonder is when I run the program in debug mode, I get a bunch of warnings in the "Immediate Window" saying:
A first chance exception of type 'System.Exception' occurred in Microsoft.VisualBasic.dll
...and some of other type (but most of them in Microsoft.VisualBasic.dll).I was wondering if this is common in projects converted from VB6, or if it is caused by bad design in our code...
It shows up in the services database and when I try and start it I receive a Access denied Error 5 error.I've tried using the local system account to run the serivce and an administrator account. Neither work. I also tried adding the local serivce account and the system acount as owners, also without success
View 1 RepliesI am using VB.Net 2008 Express.I am trying to move a button on a form, the button status is unlocked. The code that I want to use is:
Me.btnEnter.Location.Y = 474
However, I get the error message, "Expression is a value and therefore cannot be the target of an assignment" If I now code as follows, I get the error message, "Property access must assign to the property or use its value"
Me.btnEnter.Location.Y
The errors appear contradictory. Just to check, I wrote the following
X = Me.btnEnter.Location.Y
And when run I received the correct answer of 535.What is happening? What am I missing?
I have a .NET application that is shared to around 30 different computers, (mix of 32-bit and 64-bit machines).When compiled, the application is set to target 'Any CPU'.It runs fine on all machines except one that is Windows 7 64 bit.The error message is:
[Code]...
When I have the following code, I get an "Expression is a value and therefore cannot be the target of an assignment." error as shown:
Public Class Form1
'Test Project
Public Structure Blah
Public ID As String
[code].....
But when I change the structure to a class, this works fine:
Public Class Form1
'Test Project
Public Class Blah
Public ID As String
[code].....
What connection am I missing between the two? I don't understand why the first example doesn't work, but the second does. Everything I know says they should both work just fine.
Public Sub MoveMouseCursor(ByVal NewMousePoint As Point)
Cursor.Position.X = NewMousePoint
End Sub
Expression is a value and therefore cannot be the target of an assignment.
I've been working on a new application and realised that I want the target framework to be 3.5 (4.0 isn't rolled out yet). So, I changed it and now when I try and debug I get the following error:
"An error occurred creating the form. See Exception.InnerException for details. The error is: Unable to cast object of type 'System.Windows.Forms.SplitContainer' to type 'System.ComponentModel.ISupportInitialize'."
I really don't want to have to delete and recreate the splitContainer....
I'm trying to make the transition from VB6 to VB Express edition 2008.I'm using the OneClick publish the 2008 IDE provides.It appears to build and package the app. I can upload it to my website for distribution.But when the app is downloaded and instaleld on a Vista OS target system, the following error happens:Unable to install or run the application.The application requires that assembly stdole Version 7.0.3300.0 be installed in the global assembly cache (GAC) first.I checked the system that the app is built on..XP..and the stdole file version is 7.0.9466.1.I searched for stdole* on the Vista box using "Computer", "OS","Local Hard Drives(C,D)) and although there are numerous stdole32.tlb and stdole.tlb, there are no stdole. dll files.The stdole.dll file is listed in the application files list on the publish tab of the OneClick dialog.is the stdole.dll problem on the XP dev system or on the Vista target system?The Vista system always gets the latest updates as does the XP system.
View 7 RepliesI have a project that reference from leadtools 16.5, and after that, i want to run my project..i see am error like it " An error occurred creating the form. See Exception.InnerException for details. The error is: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. im using vb 2008 pro
View 6 Repliesi am working on a microwave app its very important anyways ill give up what code ive got so far and such but when i try to run it i get this error message: Visual Studio cannot start debugging because the debug target Microwave.exe is missing Please build the project and retry or set the OutputPath and AssemblyName properties appropriately to point at correct location for the target assembly. [Code]
View 5 RepliesI'm using visual studio express 2008, I wrote my code for a project and then when I tried to debug it I got a few errors but one main one that says this. Visual Studio cannot start debugging because the debug target "".exe is missing Please build the project and retry, or set the output path and assembly names appropriately to point at the correct location of the target assembly. Since this is my first time debugging a program with this particular instance of the program, I am in shock. Does anyone know how to fix this issue?
View 6 RepliesError: Trying to revoke a drop target that has not been registered (Exception from HRESULT: 0x80040100 (DRAGDROP_E_NOTREGISTERED))
I am trying to dynamically zoom inout of a pdf document that i'm viewing in a WebBrowser 2.0 control in VB NET 2008. If I navigate to a web URL the following code works fine but if I try the same code while viewing a pdf file the above exception is thrown.
Try
Dim MyWeb As Object
MyWeb = Me.WebBrowserPDF.ActiveXInstance
[code]....
[ERROR]
System.Net.Sockets.SocketException:No connection could be made because the target machine actively refused it 192.168.0.59:500 at system.Net.Sockets.TCPClient.Connect(String hostname, Int32 port) at WinClient.Form1.btnSignIn_Click(Object sender, EventArgs e)
[/ERROR]
Though I dont believe the issue is with the code here it is:[code]......
I have created an application which listens for strings being sent to my pc from a remote unit. I now need to add the function of sending strings back to the remote unit on a button press. I've searched for ages to find a solution but I'm not knowledgeable enough yet with vb.net to solve this solution.
I'm getting the error with the line opensock2 = New IO.StreamWriter(client.GetStream) saying its not connected. So I seem to need to pass the connection from the background worker to the button click, or have it somewhere else in the code to make it accessible. [Code]