Process Or Thread Changed Since Last Step
Mar 21, 2011
The code has gone bad. It is in debug mode and jumping around everywhere.
Error = "The process or thread has changed since last step."
Here is the code. I just create the file "start.csv" to initialize the shell command. This is very unstable for some reason. When I run line by line in debug mode it starts jumping around irrationally. It gives me versions of the above error.
Option Strict On
Option Explicit On
Imports System.IO
Module Module1
Public WithEvents Tmr As New Timers.Timer
[Code] .....
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Nov 24, 2010
I'm trying to build a four step process into a VB.NET GUI. The application transfers objects from AppA to AppB.
The application will follow these steps:
User constructs a general query in the GUI to identify which AppA objects to transfer. Model gets queryResults, datagrid in View lists each result User deselects items not to be transferred to AppB Model transfers selected items
how this should work. I've have the following functions implemented in the model, but don't know the MVC-way to tie them into my GUI:
Function getQueryResults(queryParams) as Items
Function transferItems(items)
Do I keep the Items data structure in the model?
How do I remove deselected from the Items data structure without building logic into the view?
Both of the above functions take time, how can I design thing to allow me to BackgroundWorker the model's functions?
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Mar 6, 2011
how can i allow a progressbar to be changed on a seperate thread? my code keeps saying that i cannot access it because it was created on a seperate thread:
[Code]...
If it is not worth it, it is not fun - you say programmers are boring but i say they are worth it.
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Jun 12, 2012
I have this code that checks if a thread or page has changed. But it always says it has changed. Because it does. Im currenlty checking the whole html page but i dont know a better way. Hers my code.
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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Oct 4, 2011
I am running Microsoft Visual Studio 2008 Professional on a Windows 7 system. While working on the visual basic exercise in chapter 4 of the Microsoft Visual Basic 2008 Step by Step book on the MyMenu program I added a Toolstrip to my form and then I was trying to perform the add OpenFileDialog and ColorDialog controls to the component tray as described at the bottom of page 111 under Using Dialog Box Controls. I could never get the controls to appear in the component tray as instructed in the book.
[Code]...
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Nov 10, 2011
I have a program that plays a video and uses the step function to move frame by frame backwards and forwards through the video. The forward frame works just fine:
AxWindowsMediaPlayer1.Ctlcontrols.step(1)
However, the backwards step (below) jumps a full second backwards while the forwards step only steps .033 seconds forward (presumably a single frame).
AxWindowsMediaPlayer1.Ctlcontrols.step(-1)
I can't find any documentation about this problem online and in fact I can't find much mention of this function.the documentation does say the -1 command should step back one frame. IWMPControls2::step method Is this a known bug or is there an updated function I should be using?
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Oct 22, 2010
I really need to learn much about it, but always stock up,.DOTNET covers the vb.net, C#, C++, ASP.NET, .NET framework is it right?.C++? ASP.NET?What should be my step by step procedure?
Will I start on database? Connection of client and server? Webrowser? Application?...etc etc etc.Will it ok if i start on studying every toolbox item one by one?
I dont have any project or every assignment that needs to be done....All i want is to learn about DOTNET
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Nov 2, 2010
coming to the topic i want to learn dotnet i am not good at programming. but i want learn it i m very passionate about it.you all know soo much about DOTNET even i want to become like you people.i have a bit knowledge about this but not much..What should be my first step towards this?How should i start with and from where should i start with?
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Jul 16, 2009
My need is to work with what I have (2005 studio), what I know (Visual Basic) but need a primer. I am a visual learner (so I need to see [1] how the form is created, named and set up). From there I need to see [2] how he code works so that I can implement from there.
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Aug 27, 2009
write SubSonic 3 Step By Step WinForm App VB.Net: Installation,Setup And Generating.
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Mar 1, 2011
Vb.net For each currentFarm in ......
If urlQueue.Count > 0 Then
Debug.Assert(currentFarm.isBusy = False)
Debug.Assert(currentFarm.WebClient.IsBusy = False)
[CODE]...
The commented code won't work. That's because by the time the thread start, the variable currentFarm have changed. So I create a new function and cache the currentFarm in the function parameter. No there will be a cache of currentFarm address (object is always a pointer) on a stack and that address is the one being passed to the System.Threading.Thread constructor.
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Mar 18, 2010
I have written a multithreaded crawler and the process is simply creating threads and having them access a list of urls to crawl. They then access the urls and parse the html content. All this seems to work fine. Now when I need to write to tables in a database is when I experience issues. I have 2 declared arraylists that will contain the content each thread parse. The first arraylist is simply the rss feed links and the other arraylist contains the different posts. I then use a for each loop to iterate one while sequentially incrementing the other and writing to the database. My problem is that each time a new thread accesses one of the lists the content is changed and this affects the iteration. I tried using nested loops but it did not work before and this works fine using a single thread.
Here is my
SyncLock dlock
For Each rsslink As String In finallinks
postlink = finalposts.Item(i)
[CODE]...
Finallinks and finalposts are the two arraylists. I did not include the rest of the code which shows the threads working but this is the essential part where my error occurs which is basically here postlink = finalposts.Item(i) i = i + 1
ERROR: index was out of range. Must be non-negative and less than the size of the collection. Parameter name:index
I tried copying it to a new list but dosent work.
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Jul 1, 2011
I have a wizard where users need to fill out data. You cannot navigate to the second step until first step is completed.
I enforced this behavior by disabling/enabling "Next" button, but I really do not like this solution, since it seems not really elegant or safe here. What is the good approach on building step-by-step processes with enforcing step completion.
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Feb 24, 2012
I'm trying to understand how this code work step by step but I'm confusing How the code work when executed from first step to last step?example: when I set obj to age = 39 . is the first step is checked if the variable in m_Age or checked in Property Age
vb
Dim obj As New Minimal obj.Age = 39 MsgBox("after setting the age to 39, age is " & obj.Age.ToString)
vb
Public Class MinimalPrivate m_Age As Integer Property Age() As Integer Get Age = m_Age End Get
[code]....
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Feb 18, 2011
Moved from Microsoft Developer Network
> Forums Home >
Development Forums >
Windows Debugging
[Code].....
MS has a patch for the OnListChanged event handler issue, even though it seems we have to pay to have access to it. This fix specifically addresses an error message when you press ESC to cancel adding a new row in .NET 2.0: [URL]
FIX: Error message when you try to press ESC to cancel adding a new row to a DataGridView control in the .NET Framework 2.0: "An unhandled exception of type 'System.InvalidOperationException' occurred in System.Windows.Forms.dll"
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Mar 31, 2009
I seem to lost the practice files disk for this book, and I am trying to 're-learn' this book. I am unable to do the lessons without the practice files. If you have the disk and could maybe zip them up and email them to me? I have the other disks still, and am using the Visual Studio Express to do this.
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Aug 10, 2009
Is this the correct forum for questions regarding code in the Visual Basic 2008 Step By Step? If so I would like to know why there is a declaration for one PictureBox and not the other. If there is a better forum for Michael Halvorson's book, can anyone direct me there?
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Sep 22, 2009
i would like to ask for little help in here. I developing application for wake on lan and i have group of checkboxes button and i sub with threads. My problem is in button event i would like to run sub only if checkboxes are checked. All works but problem is when i have this rutines in button action then it start threading all the same time. Its very hard to explain. Bassicaly i wanna read this if checkboxes systematicly 1 by 1 from top to down coz right now in my multitexbox(status) they are all mixed and i can't recognize what belong to what.
[Code]...
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Jun 13, 2011
When I started to work on this new project in vb.net 2010, I put many breakpoints to try to understand the execution order of the project, only to find it in vain. Step into command F11 should work correctly according to Visual Studio 2010: Step Into Property/Function(F11) doesn't work as expected. But I when I pressed F11, I found the code is jumping from one place to another based on breakpoints, not line by line or step by step.To give an example, please see the code below
Me.tcData.Alignment = TabStrip.TabControl.TabAlignment.Bottom 'line 1-breakpoint
Me.tcData.Dock = System.Windows.Forms.DockStyle.Fill 'line 2
...
Me.tcData.TabsDirection = TabStrip.TabControl.FlowDirection.LeftToRight 'line 3
[code]....
When I press F11 at line 1, it goes to the property 1. After it returns, when I press F11,it goes to property 3 directly, without accessing the code in line 2 and line 3.I do not understand why the code is NOT executed step by step by using F11. If I put breakpoingts in line 2, then line 2 is executed.So it seems to me that the showed execution order is based on breakpoints! So if I put breakpoints at different places, the showed execution order would be different! Thus, it is impossible for me to really understand the execution order.
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Dec 24, 2011
I'm trying to understand how this code work step by step but I'm confusing How the code work when excuted from first step to last step? example: when I set obj to age = 39 . is the first step is checked if the variable in m_Age or checked in Property Age
vb Dim obj As New Minimalobj.Age = 39 MsgBox("after setting the age to 39, age is " & obj.Age.ToString)
[Code]...
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Feb 6, 2011
how do I force a particular set of vb.net codes to run in a new thread or process.? Edit 1: I am trying TTS in vb.net but whenever click the play button , The whole program freezes and I cannot do anything else until the speech is over
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Jul 12, 2009
At the moment, I am writing a class that deals with starting an application in a thread, as well as being able to monitor the closure of the thread and process, and the creation of the thread and process through events. I have absoloutly no problems with monitering the creation of the thread and its internal process within the subs that create them. I placed notifications within the "myprocess_Exited",(for the process closure) and "myprocess_Disposed"(for the thread closure) events.
The problem comes when I terminate the outside application manually; these events do not appear to fire when the application is closed by the user, rather than by code.I thought, since the application closes with an error code when it is terminated in such a way, that it raises the "myprocess_ErrorDataRecieved" event. But this doesn't appear to happen either. Here is some of the code from that class:
'Some of the decleratoins
Event ProcessStarted(ByVal Process As Process)
Event ThreadStarted(ByVal Thread As System.Threading.Thread)
[code]....
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Mar 24, 2009
Here's the problem I am trying to solve. My program can export a file as a pdf. and other formats. I can open the file using process.start. My file doesnt have a good name so I am using a GUID as a name.
[Code]...
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Apr 10, 2012
Basically, I am just trying to close the thread/process after it's done.
Private psi As ProcessStartInfo
Private cmd As Process
Public Delegate Sub InvokeWithString(ByVal text As String)
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim psi As New ProcessStartInfo("m7.bat")
[Code] .....
I am trying to close the thread so once it's done, it closed for good and my form is closed as well. I tried Me.Close() which results in: "Cross-thread operation not valid: Control 'Form1' accessed from a thread other than the thread it was created on." Error.
Me.Invoke(New InvokeWithString(AddressOf CloseME), e) - Results in parameter mismatch error.
However, things like Msgbox("Done") works perfectly.
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Feb 1, 2010
I would like to implement a mulithtreaded crawler using the single thread crawler code I have now. Basically I read the urls from a text file, take each one and crawl and parse it. I know how thread basics of creating a thread and assigning a process to it but not too sure how to implement in the following way:
I need at least 3 threads and need to assign a url to each thread from a list of urls, and then each needs to go and fetch it and parse it before adding contents to a database. [Code] Now the code maynot make sense but what I need to do is add a unique url to each thread to go process.
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Jul 7, 2011
Is it possible to run a external program/process example notepad in thread of you vb application?
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Feb 10, 2012
I have two applications. For performing certain functions, i run a second exe, via a process, and wait till it is complete (exited) to continue with my main application. I run through many repetitive functions on different files.Everything runs fine however, when i am doing a run and it is on the x loop number, the main application seems to halt the secondary process exe. I can only assume this is what is happening as, if i close/stop (not pause) my main application in VB, the second exe continues from where it was halted until it completes.
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Jun 26, 2010
this is my code:
Dim WB As WebBrowser
WB = GetPage("http://speed.travian.ir/a2b.php?z=" + VillageID.ToString + "&c=" + Type.ToString + "&" + AttackParams)
[code].....
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Apr 16, 2010
A long time ago, on a PC far, far away from Windows, one MS-DOS program (the father) could run / execute / spawn another MS-DOS program (the son). When the son terminated, it could set a return code which could certainly be interrogated by an MS-DOS batch program or, I think, by any father program that invoked it (depending on the language in which that program was written). I have a small utilility which I want to invoke from my application, and, since that utility sets a return code, I would like to interrogate it in my application when the utility terminates. I've looked through the MSDN Library but could not find anything that seemed to cover this situation. Is there a way to do this in Visual Basic 2008 Express
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May 14, 2010
I'm using VB.net 2005, .net framework 2.0
I'm currently having a form that has a button starting a long process, with feedback into another windows textbox (call frmProcessLog).
I'm using a Background worker to laucnh the process, upgrade the status of the process and display feedback on the frmProcessLog textbox, and to know when the thread process ended up, (from the cancel button, from an error or normal termination).
the main thread process has some msgbox in it, asking questions to the operator (yes/no/cancel).
I've added the msgboxstyle.systemmodal to the msgbox call which works "ok" excpet if the operator decide to ignore the showing message box and click the cancel button on the frmProcessLog form, which is still clickable even though I supplied "systemModal" to the msgbox. this makes the msgbox hidden behind the frmProcesslog form and the process can still continue.
If I close my frmProcessLog form, I will see the previously msgbox behind it and If I end up click one of the button it will end up at an application error because the thread that called it is not existing anymore.
So I would like that the msgbox to be launched from the thread making it as if it was launched from my frmProcessLog window in a modal way.
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