Forms :: Update RichTextBox With Invoke Using Parameters
Oct 5, 2009I'm facing the problem of updating a RichTextBox (RTB) from a thread with parameters, I used invoke and methodinvoker:
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Forms :: What Is The Best Way To Update A RichTextBox
Oct 5, 2009Yesterday I was working with a RichTextBox and decided to add some formatting to my logging (I've never formatted text in one before!! O_O) ...not quite what I expected! Now, normally I work with plain unformatted text and I have an imposed limit on the number of characters I allow to be displayed in the GUI log. So I did my usual thing: After the length exceeds my cap I remove all the oldest lines from the log and set the most recent log info as the .Text property of the RTB... FAIL! All formatting was lost and things were ugly looking again. Sigh.
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Forms :: Update Richtextbox On A Different Thread?
Nov 2, 2011Basic function - enter 5-10 urls. Download all web pages using multi threads and then process it. Then in the end, the text from all threads should end up in a richtextbox. It can't be done using any of my googly searches so i thought about asking this :
how would you update text in a richtextbox from a different thread?
I am being able to download and process web pages. But can't add it to richtextbox.
Forms :: Resolved Update Richtextbox On A Different Thread?
Nov 12, 2010I've been searching around for ages now but can't seem to find what I'm looking for, anyway came accross this wonderful place so thought ay I'm creating a rewards system for school where pupil earn points for good behavior which they can then use to purchase things like a packet of pens. (They can also have points deducted for bad behavior)
View 2 RepliesInvoke A Function With Parameters?
Jan 30, 2012I use this code to invoke a function from a string, which I build in my application:
Public Class Form1
Dim f As New Foo
Dim methodName As String
Dim result As Object
[code]....
Function That Takes ByRef Parameters Using Control.Invoke ?
Nov 10, 2005I'm currently invoking a function that takes ByRef parameters using Control.Invoke (which I notice specifies the Object parameter array to be ByVal) but the array of parameters I give it isn't updated by the function. Is this possible with VB.Net 2003 or must there be some error in my code?
View 5 RepliesHow To Use Late Binding To Invoke Method With ByRef Parameters
May 22, 2009I have a COM component that I want to call using late-binding from VB.NET (using Primary Interop Assembly - PIA method). My IDL signature for the COM method looks like:
HRESULT Send([in]BSTR bstrRequestData,
[out]VARIANT *pvbstrResponseData,
[out]VARIANT *pvnExtCompCode,
[out,retval]int *pnCompletionCode);
So 2 'ByRef' parameters in VB.NET lingo, and a return value. I attempt to invoke this method like so:
Dim parameters(2) As Object
parameters(0) = "data"
parameters(1) = New Object()
parameters(2) = New Object()
Dim p As New ParameterModifier(3)
[Code] .....
This fails spectactularly with an exception: {"Invalid callee. (Exception from HRESULT: 0x80020010 (DISP_E_BADCALLEE))"}
I assume this means I'm doing something wrong in my parameterMods array. Because if I comment out setting any value of the ParameterMods array to 'True' - it works. It of course doesnt update the parameters that are [out] parameters and so it's not working as intended. Is there something else to consider since the method also has a return value? The MSDN example pretty much does exactly what I am doing, with the exception that example did not have a return value.
Forms :: Parallel.invoke & Win Forms Freeze?
Nov 1, 2011i'm Using net 4.0 & i'm learning parallel programming ,i'm using parallel.invoke to run 2 or more methods with together at a same time but i want to update my UI ( listboxes ) while i'm running methods . i can do that with threads & delegates , but now i can't do that , this code is running well
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i dont know why me.invoke or listbox1.invoke wont work with parallel.invoke !
Multithreading - Me.Invoke Doesn't "Invoke" - Threads Stall On Invoke Statement
Mar 16, 2010I've got the following code:
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The problem is that, when I call the "SetStatusBarText" sub from another thread, InvokeRequired is True (as it should be), but then my threads stall on the Me.Invoke statement - pausing execution shows them all just sitting there, not actually invoking anything.
Update Using Parameters?
Oct 26, 2010The following query gives me an error;"Incorrect syntax near the keyword 'WHERE'...
query = "UPDATE gprdsql.TblCollections SET system_time = @system_time,"
query = query & "WHERE col_uid = @col_uid"
cmd = New SqlCommand(query, conn)
[code].....
Unable To Update - No Value Given For Required Parameters
Jan 4, 2010I am having error with the line of code. It prompts me with "No value given for one or more required parameters."
Public Sub Test()
Dim csvConnString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source= D:Test.csv;Extended Properties=""text;HDR=Yes;FMT=Delimited"""
Dim dbConnString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:Documents and Settingswang1DesktopAssignment XMLXMLEmailAppTest.mdb;User Id=admin;Password=;"
Dim objConn As New OleDbConnection(csvConnString)
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DB/Reporting :: Update Error: No Value Given For One Or More Required Parameters
Feb 24, 2008I'm getting this error, Update error: No value given for one or more required parameters, which seems to indicate a variable is not making it to Access or is empty. My procedure is meant to update a product record in the database.
Code:
Private Sub btnChange_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnChange.Click
Dim cmdOrderEntry As OleDb.OleDbCommand
Dim strSQL As String
[code].....
EntityDataSource Null Update Parameters Not Getting Marked
Feb 24, 2011I am using an EntityDataSource with a FormView on VB.NET application. The FormView contains an AjaxControlToolKit TabContains with multiple tabs. Due to the fact that each tab is a naming container, Bind doesn't work properly for updating values (as discovered from reading other posts on stackoverflow). I instead have to declare UpdateParameters on my EntityDataSource.
Example markup is as follows:
<asp:FormView ID="fv" runat="server" DataSourceID="eds" DataKeyNames="ID">
<EditItemTemplate>
<asp:TabContainer ID="tc" runat="server">
<asp:TabPanel ID="tp" runat="server" HeaderText="Tab 1">
<ContentTemplate>
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This works great, until a customer is edited and their name is set to nothing (assuming in this case, a null name is allowed). The Name UpdateParameter is set to Null but the ObjectStateEntry is not set to modified for Null properties, even if previously the Entity had a value specified. As long as the name is changed to something other than Null, everything is updated correctly. I found a workaround by putting the following code in the Updating event of the EntityDataSource.
Dim ose As ObjectStateEntry = context.ObjectStateManager.GetObjectStateEntry(action)
For Each p As Parameter In eds.UpdateParameters
ose.SetModifiedProperty(p.Name)
Next
This makes sure that each property in the UpdateParameters has its state set to modified. It works, but it seems like a hack and I can see it causing problems down the road. Is there anything else I could do?
Update Data Using Parameters - Error Message
Aug 30, 2011I have a problem regarding to my Update data the message error show Syntax error near set LastName I already check my code but i dont know what is the error this is my code:
Dim sqlcmd As New SqlClient.SqlCommand
With sqlcmd.Parameters
.Add(New SqlParameter("@Id", lblid.Text))
.Add(New SqlParameter("@LastName", txtlastname.Text))
.Add(New SqlParameter("@FirstName", txtfirstname.Text))
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SQL Update Query Returns Error Message Saying Not All The Parameters Have Been Set?
Jul 8, 2010I'm trying to update an Access database by using an OLE connection, retrieving the information from textboxes where the user enters the new information.All the fields in my Access table are required fields, so I have validated that some info is entered in each one of the textboxes and that is the correct data type.But when I run the update query I get an error message saying something like values haven't been entered for some required parameters (my Visual Studio is the Spanish version, so I can't give the exact error message in English).The bit of code where the error occurs is inside the procedure called by my "Ok" button:
Dim campo1, campo2, campo3, campo4, campo5 As String
Dim campo6, campo7, campo8 As Double
Dim campo9, campo10 As Integer
[code]....
(I didn't post the whole code inside the procedure, but of course I'm creating the connection and everything)
The table has 10 fields, and the data is read from the textboxes and stored in variables (campo1, campo2, campo3, etc.), which I'm then using in the "set" query command.
"id" is the first field from the selected row in the datagrid, which I'm sending as a parameter to the procedure called by the "OK" button.The error message shows at runtime, so I'm guessing it's something in the query. Am I writing it correctly?
VS 2008 FilesystemWatcher - Treeview.invoke - Error "invoke Or Begininvoke Cannot Be Called On A Control Until The Window Handle Has Been Created"
Aug 27, 2010I have a filesystewatcher object. On it`s event it runs a procedure which fills a treeview with a data. I had problems with treeview methods, but when I run them using invoke method everything is ok. But I still have one problem. When I load the form for the first time, everything works fine. But, when I then close the form (me.dispose, me.close), and load it once again, when Filesystemwathcer start the procedure i have an exception "invoke or begininvoke cannot be called on a control until the window handle has been created" trying to run a treeview.invoke method?
View 9 RepliesFAQ: What Is Platform Invoke Service (P/Invoke)
Apr 10, 2009What is Platform Invoke Service (P/Invoke)?
View 1 RepliesInvoke UI From Separate Thread Does Not Invoke
Oct 13, 2010We have a UI with a progressbar. I know how to invoke, safely, the control from which it was not created from a thread. there are threads being processed in a threadpool, all of which calls an "agent" (which is a notifier to raise an event back to the UI to then increase the progressbar). an "agent" is set as a property in a State object, which is then passed into a method which will be executed on the ThreadPool. so, I invoke on the UI the method to update the progressbar, but the bar does not seem to update at all (screen frozen) and it takes a very very long time for it to execute. without threading, no problem.
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Passing Parameters To Forms
Jul 2, 2010I designed a form simply holding a combo box, button & Datagrid, working well when executed from another erp application.Now i would like to get parameters from the application and pass on to the form. The parameter has to replace the value of Combobox value.
View 3 RepliesForms :: Using The "Invoke" Method From Another Form
Jul 14, 2009I've run into a bit of a problem.. I am unsure as to how many people know how "IRC" Servers work here but basically, i'll explain. We are re-creating an IRC Client we made for our Chat site in VB.NET originally vb6. We have serveral different forms but the main problme we are having at the moment is FrmMain is where you login to the servers, it grabs your data from our MySQL database such as "Nick, Gender, Font" etc. Then proceeds with connection to IRC server on Raw 001 we know the connection to the IRC server has been established... so therefore we open up FrmAuth which in this case they can see roomlist etc. We are unable to get FrmAuth to load probably.
We originally had this working opening up FrmAuth before the connection to IRC server has been established.. This really is no good for us causes alot of errors etc. So when we use just simply "me.show()" the form loads but freezes we tried doing Me.Invoke(New Del(AddressOf me.show))
however, this didnt work in which I assume that is because the "FrmAuth" hasn't yet loaded the GUI thread therefore there is no Thread to invoke so we tried FrmMain.Invoke(New Del(AddressOf me.show))
This didn't work either i assume you cannot access another forms Invoke method?
we are receiving the error A first chance exception of type.'System.InvalidOperationException' occurred in System.Windows.Forms.dll which i assume has something to do with it but not quite sure..
So my question comes down to the fact of, how do we open up FrmAuth without it freezing? Is there a way to access the invoke method on another form?
Multithreading Webrequests To Update A RichTextBox Form Control
Mar 1, 2011This probably shouldn't be too hard for someone to answer...even though I've spent 2 days trying to get it right. ::sigh::
I have a RichTextBox1 on my form. I need it to update every half second pulling HTML off of my webpage. I USED to have it update every half second with timers but everything keeps getting clogged and I realized I have to multi-thread.
My code so far is
Imports System.Threading
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[Code]....
(This is an example of code from the bigger project) So I guess my question is how do I send out about 10 of these threads (Will the sleep suffice? Or will that just pause everything making it inefficient for multithreading at all and basically turn it into a timer), and what is the proper way to make the thread post the 'responseFromServer' to the RichTextBox1 in a safe way?
I can't get it to post at all because I know there's some invoke trick I can't figure out so I don't cross the threads like in ghost busters, and also if multiple threads are trying to post to it at once I'm going to need a protected way to do this.
Forms :: Passing Parameters From Winform To Html Document?
Mar 25, 2010i have a windows form that has a web browser control.
i need to pass the value from the windows form to the html doc.
here is my problem.... can pass the value across to to a function in the html page but when i try to pass the same value to an image tag in the same document it does not read the value.
here is my code from the winform
If e.Url.Equals(wb1.Url) Then
wb1.Document.InvokeScript("fetchImage", New Object() {path})
End If
it passes through the variable 'path' to a function in the html doc.
heres the code for the html doc.... this part of the code works
function fetchImage(path) {
var now = new Date();
var zm_image = new Image();
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VS 2010 : Cross-Threaded Operations: Update RichTextBox In Backgroundworker?
May 22, 2011I want to execute a few external apps, where in between a RichTextBox gets updated.. Say when program1 has been startet the RichTextBox is updated.. And when program2 has been startet the RichTextBox is beeing updated again.So what i've done so far is this:
Public Class Form1
Private Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
[code]....
But when doing the above i get the following error:
Quote:
Cross-thread operation not valid: Control 'RichTextBox1' accessed from a thread other than the thread it was created on.
Forms :: Open Crystal Report And Pass Parameters From The Row When Datagridviewbutton Column?
Mar 4, 2010I have a datagridview with below column and i have button for each row and when button is clicked i would like to take the LogId, start date, end date and log date and pass it as parameters to crystal report and run the report using these parameters and display the report.i have designed the report separately in crystal reports, can i use that or i need to design it in Visual Studio.how do i pass parameters, run and display results of the report when button on datagridviewbutton column is clicked?
View 1 RepliesForms :: Create A Hyperlink In A Richtextbox?
Nov 7, 2009I have got the code to create a Hyperlink in a richtextbox, I'll share it with you but to the experts, I have a question...
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
dim newlabel as new linklabel
newlabel.Text = HYPERLINKNAME.text
newlabel.AutoSize = True
[code].....
I need to somehow get the NEWLABEL THAT THE PERSON CLICK!
Forms :: RichTextBox Markup Formatting?
Jul 29, 2009I am trying to bind a RichTextBox to data from an XML file where text within a paragraph may be tagged with formatting tags. As an example the text may look like this:"The size of the area is 5000 m<superscript>2</superscript>".Text may also contain other formatting tags such as <bold> or <italic>:"The quick brown fox <bold>jumps</bold> over the <italic>lazy</italic> dog".
View 5 RepliesForms :: RichTextBox To Text File?
Apr 25, 2011I have a My.Settings file that has a folder path that the user will select.I need to export text from a RichTextBox to a file, however, I can't seem to figure out how to use My.Settings as the path where the text file will be created.
Right now, I have:
Me.txtlog.SaveFile("C:UsersmycomputerDesktopNew folderfounditems.txt", RichTextBoxStreamType.PlainText)
which works fine, however, the My.Settings.destfolder is "C:UsersmycomputerDesktop estfolder"
I have tried:
Me.txtlog.SaveFile(My.Settings.DestinationFolder, RichTextBoxStreamType.PlainText)
but it doesn't work - and also I do not know how to name the text file from the above code.
Forms :: RichTextBox.SelectAll() SelectionFont Not Set?
Dec 10, 2010I have a RichTextBox where part of the RichTextBox is Bold and the rest is not. If I do a SelectAll, the SelectionFont member doesn't get set.
In WordPad, with the identical Font and bolding set on part of the text, the SelectionFont appears to get set to the first font it finds in the selection...
System.Windows.Forms.RichTextBox?
Jul 10, 2009I did a conversion of a VB6 project to VB.NET 2005 and some properties of a RichTextBox control weren't upgraded. I was wondering if someone could tell me an alternative or what to do about the following properties of the RichTextBox:
ZOrder - this worked in VB6:
formMain.textStatusWindow.ZOrder(VB6.ZOrderConstants.BringToFront)
SelColor - this worked in VB6 fo example: formMain.textStatusWindow.SelColor = RGB(207, 73, 10)
Forms - RichTextBox Append Text At Cursor
Aug 18, 2010Is it possible to append text into a RichTextBox1 where the cursor is? (Ex: In-putting a string from TextBox1 to RTB1 where the user has the typing cursor at.)
View 2 Replies