Forms :: What Is The Best Way To Update A RichTextBox
Oct 5, 2009
Yesterday 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.
Basic 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.
I'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)
This 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.
I 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.
I 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!
I 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".
I 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.
I 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...
I 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)
Is 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.)
I want to create a text editor control and I tried to download a RichTextBox control in vs 2008 but i can't find it fo free. any one can give me a link to download it for free.
I'm working on a program that inputs a text box text into a RichTextBox via a button click. But when I click a button, it over writes the text that is already in the RichTextBox. How can I prevent this?
i have a simple notepad application where i want a feature of selecting text which is underlined. Usually what happens is when i click a button the app reads a text file and underlines random text in the richtextbox. What i want is on the click of another button to select the text which is underlined. I thought of creating char range, regex all but not getting anywhere. I also dunno how to build a regex.
What i know is since all RTF texts are different we can choose the rtf text instead of simple text to select the underlined text. The rtf of underlined text in my application is this uli0 so manyulnonei where ul and ulnone mark the text as underlined. Now i want to select all such texts which are surrounded by uli0 and ulnonei . I thought of the following method :
1) Create another richtextbox2
2) Paste the text of richtextbox1 as rtf in richtextbox2. I mean show the text in coded rtf (like above) instead of normal rtf.
3) Use simple find to select all the text which is surrounded by ul and ulnone tags
4) process the text.
But this step is very tedious. If anyone could help me in making a simple procedure or build a regex which could process the text surrounded by those tags,
2 forms, on the first form I have a listbox which recieves it's items from a datagridview, when I click on a button all the items (in the listbox) are converted to a string and add to a richtextbox on the second form.
On the second form I have also a numericupdown, and here is what I run into.
With the numericupdown I want to multiply or remove blocks of strings from the richtextbox.
For example, when clicked on the button (form1) a string is add to the richtextbox, when I click (on form2) on the upbutton of the numericupdown I want to add the same string again below the existing one with 2 blank lines between them (this can be down a lot of times). When I click the downbutton, a string should be removed.
In short term, the amount in the numericupdown should be the amount of string blocks in the richtextbox.
Here is the code I use to copy listbox.items to string and add them to the richtextbox:
Public Sub SGLists() Dim i As String For Each i In Me.ListBox1.Items
i'am having trouble in making a spell checker for vb.net richtextbox control.I have made a form with richtextbox control and a panel control. I have put a listbox control in the panel control and filled with certain words. What iam able to do is whenever i select a word and click a button the panel appears just below the word (using get position from char) and display the choice. What iam not able to do is:
1) Select each word one-by-one whenever i click a button say F1 - I know keypress event but how do i select the words through keypress. I know they are separated by spaces but iam not familiar as to how to take advantage of it. The major problem being that there can be 2-3 words together sometimes colored as red. Eg: What i want is when i press F1 first time "this" is selected, next time "is" is selected and next time "nice car color" is selected. The two things are spaces and red color but i don't get anything from it.
2) Display the panel correctly within the main form's border. Right now when i select the last word of the sentence some part of panel disappears as it hides behind the main form. Eg - only 1/4th appears and rest hides. I can't find a way to limit it from moving when it has reached the main form size. I want to constrain it between top-bottom and left-right border of main form.
I just wanna ask, how to format an image or a picture inside an RTB control? Its like the way MSWORD does the formatting, (i.e Center, Behind Text, etc..).
I am trying to add formatted text to a rich text box...
For instance, I want to add a heading as bold ("HEADING: ") and some data after it as regular ("REGULAR Data")...
I'd like to have a couple functions to perform the action.
When I use the below functions to add txt to a single rtf box, I get lines in either all bold or all regular. It doesn't seem to keep the font formatting after it adds text..
Public Function AddRegtxt(ByVal RTC As RichTextBox, ByVal Txt2Send As String) With RTC .SelectionStart = Len(.Text)
Here's the situation: I've got a form that has - RichTextBox - OpenButton (to load RTF file) - SaveButton (to save RTF file after editing) - Textbox (for search phrase) - SearchButton - ExitButton - 2 RadioButtons (WholeWord and MatchCase search)
All of them are working just the way I want them to except search features; I don't know how to write them properly. At the moment, they search and highlight only the first word they encounter. E.g. say I search for word "the" in the document, only the first "the" it encounters is highlighted. The rest is just untouched.
I understand this is because I've only got few lines of simple code as follows If rtfText.Find(txtSearch.Text, RichTextBoxFinds.WholeWord) = -1 Then MessageBox.Show("No results returned. Please try again.", "No matching results.", MessageBoxButtons.OK, MessageBoxIcon.Information) End If
I did try a few other snippets I found on the Internet including While loop but they didn't work as I wanted them to, and I couldn't understand them either. What I want is, which ever search option is used, when the matching result is found; it will highlight that word and when I click it again it will move onto another word. If I keep clicking, it will highlight the same words (but located in different areas) throughout the whole document and at the end, it will send back to the first matching word. Just like Adobe Reader search.
I would like to know how it's possible to append text between data.
For example:
I have a RTB with "ABC" on the first line and "DEF" on the third line. My question is how would I insert text data into the second line, without changing any existing data.
How do I set the caret position in a System.Windows.Forms RichTextBox? ScrollToCaret in not Working. Here are my Registry settings. When I save to the registry, It saves. When I try to get were I left off from the previous read, It leaves me at the beginning of the file and not where I left off. [Code]
I am using vb.net 2005. In my form there is RichTextBox, when i write particular format with bold,diffrent font,color and save to sql server 2000 database with datatype 'Text' then formatted text not save in database.what is the way or source code to save formatted(rtf) text to databse, and how to display/retrive formatted(rtf) text back to RichtextBox.
What I have is a user control that has two RichTextBoxes. In the user control, there is RichTextBox1's TextChanged event, I want it to set RichTextBox2's Text to the same as RichTextBox1's Text, I'm currently using: RichTextBox2.Text = RichTextBox1.Text. The user control is on the main form, when I run the application and type I get this error: StackOverflowExecption was unhandled. [Code]
I have an App with 4 childMDI forms in VB 2008. What I need to do is update 1 of the childMDI forms when I close another childMDI form. How do I do this in a best practice way?
I have a function called textupdate that updates text1.text value. when i call this function in Form1_Load, text1 is updated successfully. However, when i call this function in Private Shared Sub function2, no update is done. I am a newbie in vb.net programming and it may be a silly question but I could not solve it
I am wondering how do I update a Progress Bar that resides in Form1 (for example) from a newly created class called from the Button in Form1. I have read several tutorial about backgroundworker. Most of the googled tutorials have their "long process code" in the do_work event. I have tried them and got it working from within the form itself.
However, there are 2 parts (long process) in which I wish to incorporate the updating of the progress bar; First one being a long sub routine that is in the main form (Form1). The second one is another long processing function that resides in a class. It is the second one that is giving the problem as I have no idea how to call the backgroundworker.reportProgress() to update the UI.
Here is the sample flowchart that I have created for the second long processing function: I wish to insert a new instruction that says "Update the Progress bar that is in Form1" after the current instruction "Store the member into a collection".
I have three comboboxes in a form. The first is the parent of the second, which is the parent of the third. When they are all updated, a datagridview should be updated.
The problem is that the user can choose to change the value of either combobox, so I don't know which combobox's value is being changed. Therefore I now update the datagridview from the third combobox's selectedvaluechanged event. This unfortunately means that if the first combobox is changed, the second and third comboboxes selectedvalue events must trigger. As a consequence, when the first combobox is changed, the datagridview is being updated about six times (which doesn't work for me performancewise).
What I'd like to do is to call the updatedatagridview sub from either one of the three comboboxes, but only if the user has chosen to change that specific combobox's value (that is, get the form to only update the datagridview when the selectedvalues of all three comboboxes have been set).
