Send A Notification To Browser From A Thread In Net?
Jan 13, 2012
At the moment, my project has a method
do_quote(quoteid,userid)
This method take a minute or two, and then redirects to another page.
This has been rewritten so that it now runs in the background and redirects to another page whilst the thread which do_quote is on continues. - This works fine.[code]...
What i would like is to send a notification to the browser when do_quote finishes. Ideally i'd like to change the text of a div on the masterpage(but just returning an ALERT javascript msgbox would be a start).
As far as i understand, Callback is called at the end of the process, so i think this would be an ideal place to send javascript to the browser, but i can't think how i could implement this. Does anyone have any ideas on how i could implement a very basic notification (msgbox, response.write etc.) to the browser when the Callback method is called at the end of the process?
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Mar 24, 2011
To trigger a certain event to happen I must navigate to a specified URL. I can make it that when I press a button it goes to the url in a built in webbrowser. Could I make it so that the web browser is'nt there? I want it to open the url without any browser or notification.
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Oct 24, 2010
I'm trying to invoke the below but the EventHander is not compatible with the RasConnectionEventArgs from my calling event, how would I invoke SetOverlayIcon and my notification icon on the UI thread?
Public Sub watcher_Connected(ByVal sender As Object, ByVal e As RasConnectionEventArgs)
If InvokeRequired Then
BeginInvoke(New EventHandler(AddressOf OnRegChanged))
[code]....
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Dec 7, 2009
I was just wondering how I could send commands to a tabbed browser. Such as navigation. I know of webbrowser1.navigate, but that will not work with the tabbed browser. I would also like to use an commands to automatically login. But I am not sure how I could do that in a tabbed browser either. Webbrowser1.document.getelementbyid does not work for this.
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Jun 12, 2011
I have created a class with a public sub which has a variable with it using byval:
Public Class clsMessenger
Public Sub Messenger(ByVal Port As Integer)
End Sub
End Class
I now need to start that sub in a new thread and pass a varible to it but I am not entirly sure how to go about that. At the moment I have:
Dim ClientConnection As New clsMessenger
Dim ClientThread As New Threading.Thread(AddressOf ClientConnection.Messenger)
ClientThread.Start()
I can't use a global variable because there is going to be multiple instances of this routine running on different threads and each time the variable to be passed will be different.
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Jul 2, 2011
I'am trying to set up a Form With 4 Buttons "Per Say" And A Browser If You Click Button1 Google Home Page Will Show Up Button 2 Yahoo will come up etc etc..
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Feb 5, 2010
I am using the Facebook Toolkit and making a request using FQL.Multiquery. I am using the following code which returns the correct data:
Dim query1 As String = String.Format("SELECT post_id, actor_id, target_id, message FROM stream WHERE source_id in (SELECT target_id FROM connection WHERE source_id={0}) AND is_hidden = 0", FBuserId)
Dim query2 As String = "SELECT pic FROM user WHERE uid IN (SELECT actor_id FROM #firstQuery)"
Dim queries = New Dictionary(Of String, String)
queries.Add("firstQuery", query1)
queries.Add("secondQuery", query2)
Dim result As List(Of Facebook.Schema.fql_result) = q.Multiquery(queries)
When I run this 'result' list is populated with the results of the two queries in XML but I am unsure how I can send this list to the browser in JSON. I am using asp.net MVC.
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Jun 24, 2010
with the code below, I'm trying to send an integer array from a background thread to the Main Form which contains a User Draw Control. I currently get the error:"Invoke or BeginInvoke cannot be called on a control until the window handle has been created."
Public Class Form1 Me.TabPage.Controls.Add(Me.DrawGraph) 'designer.vb
Public InjectIntegerArrayDelegate As InjectIntegerArray
Delegate Sub InjectIntegerArray(intarray As Integer())
InjectIntegerArrayDelegate = New InjectIntegerArray(AddressOf InjectIntegerArrayMethod)
public Sub InjectIntegerArrayMethod(SensorData As Integer())
DrawGraph.Int_Clutter_In = SensorData
[Code]...
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Sep 20, 2011
how I could do that to click a button on a Winform send a URL or you can (with parameters) to a Reporting Services and it loads in a browser.
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Dec 3, 2009
Im trying to send a url into a browser by a button on another form,
[Code]...
but when i send it it removes the ?, & out of the text, how would i make the string keep the & and ?
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Apr 6, 2012
ok here is my problem, im making a little app for school since our school blocks pretty much everything so here is my plan a student makes 2 gmail accounts one for school one at home.
in the program at school (client) they put a site request into a textbox and they hit send, the request is then sent to the home pc gmail account and another app on the other side downloads the full site that they have requested and then sends them an email back with an attachment of the complete website, it is then opened in a browser and they have the site, simple idea and it would be easy except.
my school blocks the smtp protocols in vb, even outlook cant use gmail accounts only the schools registered email, however, you can access gmail on the internet without any blockages and you can send and recieve on the gmail website.so how can i use a webbrowser control to log the user into there gmail account through a custom gui, and send a string like www.facebook.com to the home pc gmail account, and then use the web browser controll on the students laptop to recieve the response email through a web browser, is there some kind of gmail api i can use?
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Aug 13, 2010
In one application, I need use 4 simultaneous threads.When the threads finished, I need to update the text of a TextBox.So, I create 4 Textbox, and I wanna the threads change the text to FINISHED.Each thread change one distinct TB.I use this "example"
Dim Terminados As Integer = 0
Private Sub frmEnviarMensagem_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Timer1.Enabled = True
Timer1.Start()
[code]....
The problem is, I have an error in the red lines.The error is: INVALIDOPERATIONEXCEPTION "Cross-Thread operation not valid: Control tbPlaca1 Accessed from a thread other than the thread it was created on."I don't use cross threading. Each TB only was accessed for the correspondent thread, and for the "main program".
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Nov 3, 2011
This is the error message I am getting:
"Cross-thread operation not valid: Control 'Panel1' accessed from a thread other than the thread it was created on." The reason I am getting this error is because I am opening up a new form and then calling these three things:
Panel1.Show()
Label1.Show()
Label2.Show()
why I get this error message because it doesn't occur normally if I open Form2 after closing Form1, it only occurs when I open Form2 after closing Form4.
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Jul 21, 2009
I have done a program using vb2005 to display reading from my microcontroller bs2 board but have encountered some problems. My code are as follows.
Dim Stop_Rx As Boolean
Private Sub btnRead_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnRead.Click
SerialPort1.Open()
[code]....
I've encounter an error which is, (Cross-thread operation not valid: Control 'txt1' accessed from a thread other than the thread it was created on.)
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Jun 21, 2012
When my client try to connect to server I'm getting this error : Cross-thread operation not valid: Control 'l_users' accessed from a thread other than the thread it was created on.
Private Sub _socketManager_onConnectionAccept(ByVal SocketID As String) Handles _socketManager.onConnectionAccept
l_Users.Items.Add(SocketID)
End Sub
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Feb 17, 2012
Would anyone be able to help me here please. I'm fairly new to VB.net and threading so im just trying to figure out what is happening.When I debug this I am getting the error thread operation not valid: Control 'ProgressBar1' accessed from a thread other than the thread it was created on.
I'm a little lost as to why the error is occuring or how to fix it. I've had to put the progress bar in a separate thread otherwise the GUI crashes
[Code]...
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Sep 2, 2010
My understanding is that thread.join will suspend the execution of code on the calling thread until the spawned thread finishes or is aborted...
With that in mind, I tried this:
For i = 1 to 50
threads = New Thread(AddressOf test)
threads.IsBackground = True
threads.SetApartmentState(ApartmentState.STA)
[CODE]...
However, the rest of the code runs when the loop finishes, not waiting for all the spawned threads to finish. Since the rest of the code needs the threads to finish (otherwise the rest will error).
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Jun 6, 2010
I have written an application that loads a form - frmCad as well as AutoCad. It does this via a class which detects when AutoCad quits.
Friend Class CadApp Private WithEvents AppObject As AcadApplication... Private Sub AppObject_BeginQuit(ByRef Cancel As Boolean) Handles AppObject.BeginQuit RaiseEvent Quit() End SubEnd Class
My main class loads frmCad as well as CadApp.
Public Class Cad Private WithEvents frmCad As CadForm Private WithEvents app As CadApp... Public Sub ShowForm() If frmCad Is Nothing Then frmCad = New CadForm frmCad.Visible = True End Sub... Private Sub app_Quit() Handles app.Quit frmCad.Dispose() frmCad = Nothing .... End Sub
When I debug the program, it stops at frmCad.Dispose()The program continues to execute, but all the code after it fails to work.Looking more carefully I get an error message which contains:-Cross-thread operation not valid: Control 'Autocad' accessed from a thread other than the thread it was created on.
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Feb 9, 2011
My error:Cross-thread operation not valid: Control 'label2' accessed from a thread other than the thread it was created on. I want to be able to give my Public RunBot() sub access to edit Labels, buttons, etc without an error.
[Code]...
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Apr 1, 2010
I'm getting the 'System.InvalidOperationException' error on acccessing a thread from other than where it was created. My code is:
'Required by the Windows Form Designer
Public components As System.ComponentModel.IContainer ' changed from private
[code]....
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Jun 6, 2009
My problem is Cross-thread operation not valid: Control 'statusHO' accessed from a thread other than the thread it was created on.
System.InvalidOperationException was unhandled
Message="Cross-thread operation not valid: Control 'statusHO' accessed from a thread other than the thread it was created on."
Source="System.Windows.Forms"
StackTrace:
[Code]...
i used it and it works fine then. but as it is mentioned its not a good practice to use it. So what should i do? is it ok if i use this as i am not able to use correct practice. Mine application is not for enterprise purpose. its just my class project, and it works fine even if i put application working in background. System works ok. I dont know how to correct this error.As i dont have that much knowlege of threads.
So please guide me how to fix this in correct way otherwise i am force to go for bad programming practice
Please refer to Windows Mobile Developer Center > Smart Device Development Forums > Windows Mobile Development > Appendtext not working for all my code details
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Aug 4, 2009
Cross-thread operation not valid: Control 'lv1' accessed from a thread other than the thread it was created on.
Dim lvi As ListViewItem
For Each lvi In lv1.Items
[code]....
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Feb 7, 2011
Ok i have a Form with the following
Private Sub frmMain_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
txtNotepad.Text = LoadFile("notes.txt")
[code].....
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Jan 13, 2009
i want to fill up the userID and password fields of the yahoo mail login page with the click of a button on the form but just cant get it right.[code]it just skips the yahooID field and fills out the password field. what is wrong or is there a better way of doing it?
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Sep 18, 2009
When i run the program i am getting the following error in this line TextBox1.Text &= "File Created: " & FullPath & vbCrLf"Cross-thread operation not valid: Control 'TextBox1' accessed from a thread other than the thread it was created on."
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Mar 4, 2009
I'm creating a Client Server application which involves theServer running some scripts in clients and getting back results in an automated way. In Server, other than Main thread, i have 2 worker threads, a) one monitoring response from clients and b) the other scheduling next available job to respective client which executes that job. The issue here is ,I want these worker threads to write the status of their work in the UI(which comes under Main Thread). Also i need to write things in worker thread in a Data table and Rich Text Box in Main thread. But, I can't do so, since it has been blocked to access one thread's function or property directly from others. Is there any work around to do this?
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Nov 12, 2009
Preface: I know this is an unusual/improper way to do this. I can do this with a "real" ShowDialog(), background worker/thread, and so on. I am trying to do specifically what I describe here, even if it is ugly. If this is impossible for X reason, I have created a fancy progress dialog for some of our long running operations. I need to have this dialog shown on a new thread while having processing continue on the calling (UI in most cases) thread.
[Code]...
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Sep 5, 2009
I need your help on the following. In debugging mode only the program is stopping to the following line "My.Forms.FormMain.HelpProviderMain.HelpNamespace = "Reports.chm"" with the following error ""An error occurred creating the form. See Exception.InnerException for details. The error is: Cross-thread operation not valid: Control 'FormSplash' accessed from a thread other than the thread it was created on.""
I noticed that when I am putting NONE in SPLASH screen option in the properties of the project, there is no problem.I am no familiar with treating that's why can you give me detail instruction how to overcome this annoying problem?
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Nov 14, 2009
I am getting this exception: Cross-thread operation not valid: Control 'TextBoxOutput' accessed from a thread other than the thread it was created on. in a VB 2008 Windows Forms application that I havent specifically made multi-threaded. I have create a sub called Out() like this:
Private Sub Out(ByVal inString As String)
Me.TextBoxOutput.Text += (Me.TextBoxOutput.Text & inString & vbNewLine)
Me.TextBoxOutput.SelectionStart = Me.TextBoxOutput.Text.Length
Me.TextBoxOutput.ScrollToCaret()
End Sub
and I call it from various events to log messages I am getting from my pbx, which I use a third party open source dll to access. The interesting thing to me is that if I run the deployed application (ie, not in the VS IDE) I do not get any exceptions, it's only from within the IDE.if I add the line: Control.CheckForIllegalCrossThreadCalls = False to the form's constructor, the exceptions stop, but a) this seems like a hacky way to get around the issue and b) the application seems to hang sometimes when I have it set this way.
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Sep 5, 2009
In debugging mode only the program is stopping to the following line "My.Forms.FormMain.HelpProviderMain.HelpNamespace = "Reports.chm""
with the following error ""An error occurred creating the form. See Exception.InnerException for details. The error is: Cross-thread operation not valid: Control 'FormSplash' accessed from a thread other than the thread it was created on.""I noticed that when I am putting NONE in SPLASH screen option in the properties of the project, there is no problem.
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