Read File + Download Webpage In Same Loop?
Aug 9, 2011
In a loop, I need to read a list of URLs from a text file, download the web page, and search for a bit of text using a regex.
I used the following code, with DownloadStringAsync() to avoid freezing the UI, but it triggers the error "WebClient does not support concurrent I/O operations.":
Private Sub AlertStringDownloaded(ByVal sender As Object, ByVal e As DownloadStringCompletedEventArgs)
If e.Cancelled = False AndAlso e.Error Is Nothing Then
[Code].....
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Aug 9, 2011
In a loop, I need to read a list of URLs from a text file, download the web page, and search for a bit of text using a regex. I used the following code, which triggers the error "WebClient does not support concurrent I/O operations.":
[Code]...
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Jan 4, 2012
I am trying to automate file downloads. Sometimes I get to a webpage that has a file link to download a file, but it is not a direct link. Instead it is a PHP request on the server side, for the file.
Is it possible to automate this using the webbrowser control, or is there another way I can do this using VB .NET?
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Feb 27, 2012
Reading a .txt file in VB.net. My file path is C:UsersMyLilMulePepeDocumentsVisual Studio 2008Projectscurtain_calls.txt.
This is my line of Dim LoanOptionsFile As String = "C:UsersMyLilMulePepeDocumentsVisual Studio 2008Projectscurtain_calls.txt"
I can read the file when I run the program, but how do I write the file path so that someone else can download my program and file and read the file on their system?
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Dec 16, 2010
I cannot read filename in response header:Content-Disposition: inline; filename="
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Feb 19, 2012
Basically i have a .net application that has a directory path stored in the app.config file. this directory path outputs xml files that will be read by an asp.net web page.
Is there any way i can get the asp.net web page to read the directory path stored in the app.config file? Should i look to use the web.config file at all?
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Mar 3, 2008
I need to download files from internet without using FTP, here's my idea:To check version of the program and also download updates.So firstly, when the user enters the splash screen there is a timer which will check updates (downloadTimer) so then downloadTimer starts to download this txt file http://localhost/version.txt and then when its downloaded (and replaced the old one that was on the computer already) and then after that, read the file. If the version.txt contains version 1.0 then pass the check and splash screen closes, main form opens, else then msgbox ("Please Wait!" & vbcrlf & "Downloading updates") and then download updates with the same way from downloading version.txtOh! and also when the file is downloaded (version.txt) save it to "c:programMyApplicationversion" downloading the file without using FTP (if there isn't any other way i could use FTP).File reading could be made with an IO.FileStream thingy.So how do i do the download part?
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Dec 4, 2010
I'm using visual basic 2010 express..I'm building my own web browser and want to add a download manager.I have been able to build one that will download a file if I type the file location into a text box.What I'm trying to figure out is how to have the download manager open when I click on a download link on a web page.How to make the download manager know it is a link to a downloadable file as opposed to something like a link to another webpage?
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Jun 11, 2010
I am writing a VB.NET program and I'm trying to accomplish the following:
Read and loop through a text file line by line
Show the event of the loop on a textbox or label until a button is pressed
The loop will then stop on any number that happened to be at the loop event and when a button is pressed again the loop will continue.
Code
Imports System.IO
Public Class Form1
'Dim nFileNum As Integer = FreeFile() ' Get a free file number
Dim strFileName As String = "C:scb.txt"
[Code] .....
I'm able to read the text file but my label will only loop if I hit the start button. It goes to the next line, but I want it to continue to loop through the entire file until I hit a button telling it to stop.
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Feb 4, 2011
i have this code
[Code]...
I want If A.Text = (detline(0)) the program show a msgbox (OK this) and after the msgbox to cl;ose the file and exit from soubroutine When the pointer reach the FileClose(ReadFile) i receive in Catch When an Err.Number 13 WHY??
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Jul 25, 2008
I'm using VB.Net's Excel component to read Excel file, but the performance is totally slow, since it has to loop through cells to get values. Reading a file containing one sheet with 1162 rows and 105 columns (which is small size compared to my general requirement) already costs more than 5 minutes.1. I want to ask if any of you have suggestion on reading such an Excel file with better performance, except OleDB, cuz most compies here have vesion problem?2. Is it normal that it tooks a long time for Excel component to read Excel file, or is it that I implement the code in a wrong way?
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Jan 20, 2012
I have a folder that contains about 100 txt files with information in each file.I'm trying to figure out how to loop through each file in the folder, and add the text to a string.I've pulled this off MSDN's site, but it doesn't seem to read "each" file but just one.
Dim path As String = "c: empMyTest.txt"
' This text is added only once to the file.
If File.Exists(path) = False Then
[code].....
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May 30, 2009
I am looking to go to a URL/URI download the resulting string as if I had opened a file and then get it out into a String variable.
I have been stuffing about with IO.Stream and Net.httpxxx but haven't managed to get the elements to line up in the right way.
I get "the given path's format is not supported" from opening the page in the standard stream, because it's not in the local file system ... that bit i understand, the bit I don't get is ... how do I achieve the equivelent of:
Public Function GetWebPageAsString(pURL As String) As String
Dim lStream As IO.StreamReader = New System.IO.StreamReader(pURL)
Return lStream.ReadToEnd
End Function
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Aug 8, 2011
I read the following question to download a web page whose contents is coded in UTF-8. The page is then converted into a byte array, while I'm using a String to read contents from the page.
I need to turn UTF-8 into Latin1/ANSI since that's what RichText and MessageBox seem to use (I'm getting funny characters).
Is there a more direct way to donwload a UTF-8 page and convert it into ANSI/Latin1?
Edit: When callig MessageBox, accented characters are not shown as expected:
Content = CStr(e.Result)
'Théâtre, Métro
MessageBox.Show(Content)
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Aug 21, 2010
Does any one know how to download webpages that have a nonscript tag. I have used httpwebrequest and weclient but I always get the text in the nonscript tag. The only thing that i have gotton to work is the webbrowser but I have encountered many problems.
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Dec 18, 2010
I have a windows forms application with the msi installer residing on my web site
Prospective clients can download the installer from a web page after filling out their contact details. This works fine
I would like to be able to auto run the installer after the download is complete
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Sep 7, 2009
I am working on a task in which I have to download all flash objects swf and flv files running in web page. I have got no clue to find he source of .swf file, as mostly swf files comes from other servers. I want to find out some way to find the source / url of .swf currently running. Kindly suggest me some way.
I have 2 ideas in mind, but currently unsuccessful in implementing them
1. Using WebBrowser class and somehow find url of swf.
2. Using Pcap to fetch all http packets and after decoding, some how try to find url coming.
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Mar 26, 2010
Probably a simple question but I cant figure it out. I have a webbrowser control, which navigates to a URL where it logs in, then a different URL where theres some information I need. I would like to save this page as an HTML document. I can navigate to the page easily, so is there any way to tell the webbrowser to save the current page as an HTML document?
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Apr 21, 2010
I have been wanting to make a file downloader (enter the website link, it browses files, with the Filter you give it, then has a download link for each file.) I haven't coded VB since 2006 and can't even remember the basic code.
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Jul 2, 2009
I'm trying to Download a String from a Webpage, but in order to do that, I need to download the whole webpage. I've found it easier to use DownloadString, but I can not figure out how to process each line of the Downloaded String, as it is one whole string.
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Dec 4, 2007
I've been trying for a while to use a method I've found on the net to login to a webpage then download zip files off the page.Here is what I am doing:
Code:
strURL = "https://www.someurl.com/"
Client = New WebClient()
[code].....
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Jun 23, 2009
I'm creating an application where I want to save a webpage to a file. The webpage has a Javascript function written into it. See below
<html>
<head>
<title>Javascript</title>
[Code]....
There is a reason for this. I will be required to retrieve data from a Javascript API. The API can only display data on the webpage and somehow I have to retrieve it from the webpage.
I'm using Visual Studio 2008 but with .Net Framework 2.0. Haven't tried out 3.0 or 3.5.
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Apr 8, 2011
I want to download the same information which is obtained when we right click view page source in browser. I want to do this either in vb.net or perl
I need it for google image search result webpage.When that page is saved then html code is not same as view page source info.tags for images are absent. [code]...
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Aug 17, 2009
I have an email creator that needs to extract the emails created from the html page, display the accounts in a richtextbox1 & then save the accounts as a .txt file on my system. How would I go about doing this? Doe anyone have a great code sample??
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Mar 11, 2011
all I want is a function like this:
[URL] but then with the option to provide username & password. I have managed to do this with the webbrowser, first logging in then go to webpage and get source code but this takes much longer than just getting the source code...
Is there any way to do this? I found this:
[URL]
I tried with &username=...&password=... in the URL but it didn't work
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Nov 18, 2011
I usually download file using following code:My.Computer.Network.DownloadFile("url of the file","filepath to save the file")But recently I encountered a site that only allow file download if you click it from its site and not via direct downloading from vb.net code.How to download file from http server that requires a referral before allowing the download?
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May 31, 2011
I am making this program that has a loop that goes to a website and fills in a form within the loop. But first, here is my code thus far
Dim message As String = TextBox3.Text
Dim loopnumber As Integer = TextBox4.Text 'makes the necessary variables
Dim browser As New WebBrowser
Dim url As String
[Code] .....
But what happens is that the loop runs a few times then it errors on the setattribute line (line 19 above) with
NullRefrenceException was unhandled
And I have a feeling that it is not loading the page fully before it tries to fill in the form.
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Apr 13, 2011
What is the meaning of asynchronous file download and synchronous file download ?
I came to them while using system.net.webclient class
I know a basic meaning of tcp/ip and http .
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Nov 10, 2011
i try to download multiple file + progressbar.. but its seems nothing happened and the file is not download.. my program just function like.. when the file was error.. it will download the latest file from webhost..
[code]...
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Oct 23, 2009
Imports System.Net
Public Class DownloadStuff
Dim downloader As New WebClient()
[code].....
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