VS 2008 WebClient And Loop?
May 8, 2009
I need help to optimize this
For x As Integer = 1 To Me.dtsCustomers.Tables(0).Rows.Count Try
'I SEND VALUES: NAME CUSTOMER AND HIS AMOUNT
Dim client As WebClient = New WebClient<br/>
client.Headers.Add("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)")
client.QueryString.Add("customer", Me.dtsCustomers.Tables(0).Rows (x).item("customer"))
client.QueryString.Add("amount", Me.dtsCustomers.Tables(0).Rows(x).item("amount"))
[Code]...
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Jun 4, 2009
I am making a little program witch get information from the web. Now i got some complains from people who are behind proxys. So my question is: Is there a way to get the proxy settings from IE, and let the WebClient use them?
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Oct 10, 2010
I have not much experience with the WebClient.. How can I catch this exception of e.Result DownloadDataCompletedEventArgs; "The remote name could not be resolved", which occurs after some time when internet connection is not working..? [URL]
The calling method:
Private Sub DoDownload()
Dim wc As New WebClient
Try
wc.DownloadDataAsync(New System.Uri(Me.webImageLink))
AddHandler wc.DownloadDataCompleted, AddressOf OnDownloadCompleted
Catch ex As Exception
Debug.Print(ex)
End Try
End Sub
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Apr 29, 2010
What is the difference between those 2 classes in System.Net?How can I login to website using one of these classes, and how can I post to a forum?
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Dec 3, 2009
How would I make the Progress Bars Value = The Percentage of a file being downloaded using a Webclient?
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Aug 12, 2009
i'm using WebClient in VB.NET to make requests. I add the headers using WebClient.Headers.Add() in the order I want the headers sent. However when I packet sniff the requests it makes I can see that the headers are sent in totally the wrong order. Does anyone know if there's a way of setting the order the headers are sent?
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Mar 8, 2010
I've been testing using WebClient.DownloadString and sometimes I encounter an error: "The remote server returned an error: (403) Forbidden". It is based upon which url I use. For instance, this works:
Dim wc As New Net.WebClientDim strResult As String = String.Empty
Try
strResult = wc.DownloadString("http:/ Obama pages always fails.
[code].....
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Jan 6, 2009
i am using the Webclient and Streamreader in Visual basic 2008 to retrieve data from the web. I access Yahoo and download stock information this all works well except for one area. All the indices symbols on Yahoo start with a circumflex character ^ so for example, the Dow Jones Index code is ^FTSE. When I include the ^ in the URI string sent via the Webclient it does not send the ^ it sends the code for ^ instead which Yahoo sees as %5E. Having made some tests is seems that certain characters do not get converted to their hex code and some do. A * gets sent just fine but a % also gets sent as its code 25.If I manually enter this from my browser it works just fine.
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Apr 9, 2009
I've just switched my code over that downloads data as bytes to use a WebClient. I add a header saying I will accept GZip and the site I'm downloading from sends me the data compressed. The problem is, how can I check to make sure it is compressed data before attempting to decompress it? It was much simpler when I was using a Web Request to check the response headers, but I'm having a little trouble checking the reponse headers with a WebClient. Does anybody out there accept compression with a WebClient?
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Nov 30, 2009
I'm using the following code to set the proxy on an HTTPWebRequest:
Dim proxy As New WebProxy("HOST:PORT")
...Then...
' Goto the final URL
request = CType(WebRequest.Create("[URL]"), HttpWebRequest)
request.Proxy = curProxy
[Code] .....
Now I put in a valid Proxy, don't run into any problems applying it, but IPChicken will always return my IP address, not that of the proxy.
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Oct 28, 2010
I'm looking for a way to fill in various website details using a HttpWebRequest/WebClient. I can manage it quite easily using an invisible WebBrowser control, by manipulating the HtmlDocument, but for some reason I just can't quite grasp the way I would do it with a HttpWebRequest/WebClient. I've heard both of these can potentially submit info using the UploadData functionality etc, but I'm missing specificsI've done a lot of searching on google just for a basic example to get me started, but the only one that LOOKED informative was written entirely in German.Take, for example, this website. Let's just say I wanted to automate filling in my username and password into their respective boxes and then pressing the "submit" button. How would I start going about this, and how do I get the resulting page? (I'm assuming cookies that the page creates will keep your next webrequest going)
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Apr 30, 2010
I've been using an invisible WebBrowser control to submit a form on my server, but I'd like to use System.Net.WebClient() to accomplish this so I don't have the control hanging around on my form.I need to get the page, fill out the username and password fields, and click the submit button. This was done easily enough with the WebBrowser control, but I can't find any examples using System.Net.WebClient().
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Mar 3, 2010
I use a downloadstring (instance.downloadstring) with instance as the'System.Net.WebClient'.
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Apr 21, 2009
I can download the files I want. However, the client has insisted on creating different folders which will contain the version number. So the name of the folders would be something like this: 1.0.1, 1.0.2, 1.0.3, etc.So the files will be contained in the latest version in this case folder 1.0.3. However, how can my web client detect which is the latest one?
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May 16, 2011
I'm having trouble using the webclient to download a file. This same code works in another app that I'm using, but when downloading the second file, I get an exception saying that there are illegal characters in the path.The second item that it is having troubledownloading's filename is "Filename.exe.manifest". The RemoteUri is the download link, item is the name of the file. When I print out the path that it is downloading from and the path that it is downloading to, both are correct. I can type the address in the browser and it downloads fine. (The problem file is not exename)
For Each item As String In files
If item = exename Then
If My.Computer.FileSystem.FileExists(Forms.Application.StartupPath & "" & item & ".new")
[code]....
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Jul 15, 2009
I have a weird bug with webclient. I made an app a while ago which uses webclient to download a small thumbnail image.. and I rememeber when I first made it, the first time webclient was used to download the image it always took 15 sec+ to download it, but after the first it always downloaded quickly (in like 1 sec) .. but then the problem went away for me and it always downloaded fine.but now someone else who uses my app is having the slow image download problem apparently around 50% of the time it downloads the thumbnail images. so does anyone know what might be causing this? As I said, I don't have the problem any more on my comp - but I don't know why :s
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Jun 29, 2010
I'm downloading a file from my website using WebClient.DownloadFile(),I'm wanting to do it asynchronously, so my UI stays responsive, that would require me creating an array of web clients, is that bad practice? Or is it acceptable?I have looked into FileWebRequest, but thought WebClient looked easier to implement.
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Oct 7, 2011
I've managed to narrow down my issue to a simple annoyance. I had a Webbrowser control mostly coded to navigate around an Oracle CRM On Demand site to generate metric reports, but then realized when I tried to build in the auto-download part, that the Webbrowser object wasn't going to give me the behind-the-scenes control I wanted. Searching online, it seems the Webclient control might be a better route. However I'm stuck trying to get by the login page so I can use the Download-File method to get my generated xls report. [Code] But every reply from the server has "Sign In Error: Both a user sign in ID and a password must be given." which tells me the form/post data isn't getting where it needs to go (It thinks the form is blank at [Code].
The above username and password are bogus of course, but once I can get a different reply then 'the fields are blank' I can worry about correct logon information. I'm just not sure what I'm not doing correctly or if I need to include something else. Since it's a publicly accessible site and I'm stuck getting something in the form to be 'seen', it should be easy for others to try and test.
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Aug 11, 2009
I assigned an integer as 1, and looped my program using:[code]I can recieve the packets without looping, but once i loop, i receive nothing.
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Mar 14, 2011
Makes the following statement about the code below:
**"The computer evaluates the loop condition in the Do...Loop statment to determine whether the loop instructions should be processed. In this case, the inputsales <> String.Empty condition compares the contenst of the input sales variable to the String.Empty value. As you know the String.Empty value represents a zero length, or empty, string if the inputsales variable is empty, the loop condition evaluates to True and the computer process the loop instructions. *If on the other hand the inputsales variable is not empty, the loop condition evaluates to false and the computer skips over the loop instructions.
Based on the code I think it is the opposite: ...that while the inputsales value is not empty it should evaluate to true and process the loop and if it is empty it should evaluate to false and skip the loop?
See below.
Option Explicit On
Option Strict On
Imports System.Globalization
[CODE]...
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Aug 7, 2009
I'm here again asking stupid questions. I don't have really get this but i ask again but i try explain all better. Here is a website link and i want catch string from here. Look page's source code and find first what starts <td> someword </td> I use this code for catch word from page. Visual Basic Express 2008
[Code]...
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Nov 12, 2009
Dim xml As New XmlDocument
Dim rd As XmlTextReader
Dim wrq As System.Net.HttpWebRequest
[code].....
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May 13, 2010
I would like the VB.net WebClient to remember cookies.
I have searched and tried numerous overloads classes.
I want to login to a website via POST, then POST to another page and get its contents whilst still retaining my session.
Is this possible with VB.net without using WebBrowser control ?
I tried Chilkat.HTTP and it works, but I want to use .Net libraries.
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Mar 5, 2011
I use
wb as webclient
wb.downloadstring(url)
Say 40 seconds have passed. I want wb to just give up. How to do so?
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Jul 12, 2010
well its werid it worked once but then it just randomly stop i do havenamespace
Imports System.net
Imports System.IO
[code].....
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Jun 20, 2012
as per usual i am a little confused. I know DownloadStringAsync runs on a threaded pool with a default min and max threads limit, but what confuses is how would i call DownloadStringAsync say for example ten times.Example.I have an array with 10 URLS. Surely i would not use a for each loop of the array index to pass the url address while each time calling DownloadStringAsync(New Uri("someArray(index)") surely we can pass say a range of items from the array and let DownloadStringAsync decide on the threaded pool how many to process each time?
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Nov 19, 2010
I keep getting a notification that the application is already open. I have multiple users in different sessions on the box, and I thought I coded it right, but for some reason it loops still, but only with this one app??
vb.net
Private Sub clinicalLaunchorSwitch()
Dim CurrentSessionID As Integer = Process.GetCurrentProcess.SessionId
Dim hwnd As IntPtr
Dim prc() As Process = Process.GetProcessesByName("open")
[Code] .....
Maybe I just don't understand Exit For yet? I want to do something like:
For each instance of x.exe then t = t + 1
then
exit for t# of times. Is this possible??
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Aug 26, 2009
I am very close to finishing this function, what I am trying to do is a for loop which:
1) Grabs the value
2) saves the value in an .xml file for later use
Currently when I use a for loop to feed in my function I overwrite the hiddenFields.xml on every pass, instead of adding to it.
Calling function:
vb.net
For X As Integer = 0 To postingHiddenFields
Dim hiddenFieldsReturned As String = functionDealWithHiddenFields(HTMLResponse, postingHiddenFields, X)
Next
[Code] .....
So basically on every pass of the function I'm overwriting the values instead of adding to them.
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Jul 5, 2009
The following code is executed at an interval of 60000 milliseconds.
[Code]...
I tried doing a step through starting at a break point i put at the For Each line. It will go inside the For Each loop but when it reaches the first if statement and it finds that if statement false it will not go to 'Next' and continue to execute the loop instead it goes to End Sub. I want to be able to view what is going on inside the loop, i think the final upload process works so it does do the loop, though i can't step through to view it.
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Apr 30, 2010
I know it can be written better but the problem is: FOR loop is performed only first time BtnAdd1 is clicked. Why???? Private Sub BtnAdd1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnAdd1.Click
[Code]....
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