WebBrowser - Navigate Through Pages And Multithreading
Jun 13, 2011
I have a program that has a webBrowser navigate through a few pages, and when it gets to the last page I set it to navigate to, checks if there is a certain string on that page. I just switched my code around to use multithreading and now the statement
If WebBrowser1.DocmentText.Contains("...") Then
...
End If
Generates an InvalidCastException that says "Specified Cast is Not Valid".
Here is how I start the thread (when a button is clicked)
FUBCThread.Start()
And here is the Sub that is run
Public Sub beginFUBC()
While True
If TimeOfDay > "11:31:00 PM" Or TimeOfDay < "07:00:00 AM" Then
[Code] .....
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Aug 24, 2008
I want to make something that can on button click navigate to a page, wait the time I specified and navigate to another page..
[CODE...]
This does not do what I thought it would do..I think that the problem is that when it sees System.Threading.Thread.Sleep(5000) everything stops for 5 secs .How can I make it go to google.com and then after 5 seconds, yahoo?
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Jan 17, 2010
My boss has given me an asp.net web application that was done by his former employee. Now my boss has no contact with that employee. He wants me to make some changes in that web application. I went through the application. There is no documentation present for that application . Its a huge application. It contains many directories. I think it was a team work. It has many asp pages, aspx pages, jsp pages, xml pages, css pages, etc... How to understand other person or team's website or web application that was written in asp or asp.net and vb or vb.net?
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Sep 3, 2009
I would like for my program to navigate via textbox1.text with multiple lines and multiple url links inside of it. I know how to make the webbrowser1.navigate via textbox1.text with multiple lines, however I want my webbrowser to navigate to each url every 1-1.5 seconds once button1 is clicked. Yes, my webbrowser1 will navigate to the specified urls via the textbox1.text (multilines) with a button click, but I need the webbrowser1 to navigate in a order sequence from top to bottom of Textbox1.text (multiplelines) every 1 second. Here is the current code that I have to navigate via multilined textbox1.text control in order sequence:
[Code]...
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Oct 7, 2010
I cannot for some odd reason get the webbrowser to navigate I have enabled web content I use the form button and place it the coding I put
Code:
Private Sub WebBrowser1_StatusTextChange(ByVal Text As String)
Me.WebBrowser1.Navigate2 "www.google.com"
End Sub
it just has a white screen
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Dec 28, 2009
Im trying to put in a list of urls, start 2 new threads and in each thread dynamically add a webbrowser that will navigate to the url.Here is the code ive got so far:
This is after I click 'start'
[Code]...
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Mar 15, 2012
I am using WebBrowser Control...
When form is loading i set webbrowser to navigate a website.
Now this website running too much popup ads.. So each time webbrowser navigate a new popup window open out of my application.. Is their any way to stop that..
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Apr 25, 2010
Is it possible to use WebBrowser.Navigate() with a proxy? I read somewhere that this is possible but I cant find the link now.
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Nov 2, 2009
I have a webbrowser on my windows form and a text box above that with a go button. The webrowser is a search page.Is what I would like to do is type something in the textbox and hit GO and it will search for that word in the webbrowser.The search is setup to where if you were to set the url as it would bring up the results for "keyword"Is there a way with the navigate function to do something like.[URL]..basically I need a way to append the text from the textbox at the end of the url.
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May 24, 2009
I was thinking:
Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
Browser.Navigate(ComboBox1.SelectedItem)
[code].....
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Apr 20, 2009
I'm working on a webcrawler in VB.net, and using the System.Forms.WebBrowser object for handling navigation on sites that use javascript or form posts, but I'm having a problem. When I navigate backwards (WebBrowser.GoBack()) to a page that was loaded with a form post, the page has expired and I have to do a refresh to resend the request. When I call a refresh (WebBrowser.Refresh()), a dialog box pops up to confirm. Is there a way I can get around this modal dialog in code?
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May 13, 2009
I'm using a webbrowser control to pull some information from a website. It works fine.I load the web page when the user clicks a button and then I pull the information from the site when the page completely loads. I have this bit of code in the DocumentComplete event.I am doing this for two different websites. So, my code as it is, looks something likes this:
vb.net
Private Sub btnStart_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnStart.Click
WebBrowser1.Navigate("http://www.website.com")
End If[code].....
If I add a second Navigate to the same WebBrowser control, and then add another Document. GetElementById line, using different variables, it doesn't work.Its obvious that it loads both sites and then it finishes. So, it never has time to finish the first load and then pull the info into the text box.Is there a way to do this? To load the first site, pull the info, load the second site, then pull the info from there?
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Jan 13, 2012
I need to send a pdf file to a web page in VB.net. I found that there is a webbrowser control and I should be able to use the navigate() method to do it.However, there is no sample for doing so.
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Aug 7, 2009
I made a quick Web browser that I only want to show one page when you press a button ( you have to enter a name into a textbox and it will then make the URL to show), but the page has some links on it, which I don't want people to click on.
1) Disable the hyperlinks
2) Disable left clicks in the browser
3) Make the browser somehow only visible and not actually interactive with a mouse
I tried something like
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
WebBrowser1.AllowNavigation = True
[code]....
Which I assumed would allow navigation once you clicked the button, but would then not allow it once you are done clicking it, but it just stays at false.
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May 17, 2010
I am making a webbrowser, can somebody tell me how to prevent my browser from opening new IE windows. Because what happens is, there are some links that will open new windows and therefore IE comes in place because it is set as default windows browser which I really don't want because my browser looks really bad if it opens links in another webbrowser. I want it to be just a basic browser, it has only one window, and it should navigate within that window. This is because the browser is integrated in a bigger application only for some website applications that are related to this main application.
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Nov 4, 2008
in my form load, I have the web browser control navigate to a site. What I'm trying to do is when a user clicks button1, i want the program to look through the webpage and check if there is an image source equal to a static URL that I assign. this is basically just navigating to a website & checking if a certain link exists.
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Jul 22, 2011
I am developing a webbrowser and i have got a big problem..The webbrowser uses tabcontrol as a brwser to navigate.I have a problem , that the tabcontrol doesn't have the same events as webbrowser, so i can for example put my download manager in the FileDownload event becouse it isn't there, or a new window and all that evets usefull that webbrowser has and the tabcontrol doesn't.
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Jul 29, 2009
I based a lot of my project on your Codebank submission for navigating web pages. I have ran into the problem a few times where it would stop navigating. You had recommended deleting the Interop files and rebuilding the solution. I have done this and it used to work just great afterwards (I was deleting all Interops and AxInterops in the Bin/Debug and Obj folders)I now have a strange case where it compiles and builds and navigates as expected on the computer I coded it on, but when I install it on another machine, it fails to navigate again. I made certain it worked directly before building and that I used the correct setup file but nothing I seem to do now cna make it navigate on the second machine. What else should I check?
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Jun 3, 2010
I have an application that allows users to navigate PDF files on a local network. Each time a new document is opened, a tab page is added to my tab control and the webbrowser control is added to it then I call the webbrowser.navigate function to open the file.In windows XP this worked great. However, when switching to Windows 7, it always wants to open the PDF using adobe reader in a new window.
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Feb 25, 2009
I have a simple program with a web browser control and a button that causes it to navigate to a certain web page, as well as an input and another button for entering a url directly.Everything was working fine until I started messing with the document completed event in the control.The form loads a url initially and after that 80% of the time it freezes when clicking the button or entering a new url. I deleted the document completed code and now it still freezes a majority of the time.
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Oct 1, 2009
Creates a webbrowser in a background thread, then is supposed to navigate to a url and return a htmldocument, but the navigate fails for some reason
NOTE: this is part of a class where you see ME.url or me. ... me.isrunning = boolean false by default me.url = uri of location to navigate to
Public Function GetDOC(ByVal url As Uri) As HtmlDocument
If Me.IsRunning Then
Throw New Exception("Object Currently In use")
[Code]....
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Mar 23, 2011
In my program I am trying to make a combobox that when the user hits enter it will navigate the web browser to the site address that the user entered into the combobox. I tried this code:
If Keys.Enter Then
WebBrowser1.Navigate(ComboBox1.Text)
And then when I debugged the program and tried it out, the web browser did nothing.
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Oct 22, 2009
I'm guessing there is a really simple answer to this but i've spent the best part of 2 days trying to get it to work and cannot figure it out.Basically, I want is the webbrowser to point to a local folder on a machine. A different one depending on who is logged on. The code I have so far is as follows.
Imports System.IO
Public Class frmFav
Private Sub frmFav_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim username As String
[code]....
I cannot get the URL value of the webbrowser (FavProgs) to take the value of directoryname. If I set the URL value in the properties for FavProgs it does what I want it to do perfectly.
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Apr 5, 2010
I'm using a webbrowser control in my program and I navigate to a page that uses sessions. I need to delete them somehow and I tried to close IE and enter it again and it worked, the sessions were deleted. But I've done it manually, and I need to do it through my program, so is there a way to imitate the closing and reopening of my webbrowser control?
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Apr 12, 2009
I have a problem to enter a web site by program and not manually. I just navigated WebBrowser1 to a web site. After the navigation there is a button in the site. The button will send me to a link if I will click on him. I got the link path (After calling to a Sub doing it) in a String call SitePath. Now after I got the button's path I tried to navigate the WebBrowser again to the new path. But, the WebBrowser navigates again to the same Web Page The Site do not let me to enter the link by program only manually when I click on the button. Is there a way to click on this button by program or other way to enter the path?
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Dec 6, 2010
Is there a way to check to make sure that you dont get a "page not found" error during a webbrowser.navigate call?
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Apr 5, 2010
I'm using a webbrowser control in my program and I navigate to a page that uses sessions. I need to delete them somehow and I tried to close IE and enter it again and it worked, the sessions were deleted. But I've done it manually, and I need to do it through my program, so is there a way to imitate the closing and reopening of my webbrowser control?
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Jun 26, 2011
I am using webbrowser control to automatically navigate through facebook.Nothing malicious, just an experiment of sorts.Im working on a bot that that would extract the names of all friends on my friends page, open up those pages, extract their friends names, and repeat.The end result would be a chart of who knows who. A sort of 'six degrees of separation' experiment.I have everything automated up until getting to my friends page and I am having trouble extracting the urls from my friends page. [code] Now, I figure I can extract from <div class=fsl fwb fcb">, but Im confused as to how to go about doing this. On another thread, someone said it cant be done with webbrowser control, but im new automation.
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Oct 27, 2009
I recently upgrade a project from vb 6 to 2008. Most of the code runs fine.I have a webbrowser form control that I use to navigate local files and display them with. (i have a file list box that you click which calls the navigate of the browser control). Most file types i have test work fine and display just as they would in a real browser window. Excel, PDFs, etc... so examples of files that utilize "plugins" like acrobat reader inside the browser work great. Tiff files are the exception. No error is thrown in vb, but the browser throws 2 runtime errors, included at the end here. After the browser errors are ignored the program continues execution but will just not display the file.
i can type the path to the file (eg c: estfielsfilename.tif) in a regular browser window and it displays just like it should, inside IE, using a plugin.Prior to upgrading, depending on what was installed on the computer, navigating to a tif would open the tif with picture and fax viewer, or display it with a tif viewer plugin.
Line:1
Error: Invalid Character
when click NO to debug it goes to
Line:0
Error:object expected
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Oct 26, 2010
I'm using a WebBrowser control in my current program in a bit of a bastardized way: I don't use it visually, I just use it because I'm more familiar with its events.
So, basically, I create a WebBrowser control and navigate to a page to login. Then, when logged in, I create a new WebBrowser control and navigate to a different page.
I've used this program for four months with no difficulty. Starting today, though, the second phase of that has been going really, really slowly. What used to take 3-5 seconds is taking 25-30 seconds. It still works eventually, it just takes a while.
Usually I would assume this was a server problem. However, navigating to the exact same URL in Firefox happens extremely quickly. Weirder still, within the program there is a user WebBrowser control -- I can copy/paste the URL the previous (not visible) WebBrowser was navigating toward into this user WebBrowser, and it goes just fine.
What in the world could be holding up this other "custom" WebBrowser? I don't even know where to begin in diagnosing this.It might be important to note that the site this is working based off recently underwent some changes -- but I can't imagine why that would affect only these "custom" WebBrowsers and not the user one in the same program.
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