VS 2008 - Downloads Data As Bytes To Use A WebClient
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?
I'm trying to download multiple files based on what a user has selected on a formI have multiple checkboxes in place, so If a user would select Checkboxes 1,3,4 I would want the webclient to download files 1.txt, 3.txt, 4.txt.The WebClient method is causing a "WebClient does not support concurrent I/O operations." error.
If chk1.Checked Then WC.DownloadFileAsync(New Uri("http://www.google.com/1.txt), Path.Combine(DataSource & strDirectory, "1.txt"))
[code]It gives me problems right there because it downloads the file but not the data in it,url... is 1 kb and has one character in it - 1, when it downloads it has the right name and extention but the contents and size is gone size is 0 bytes and contents are empty.
It was working fine until I changed it to connect to an ftp sever, added NetworkCredentials and said connect, downloads fine but does not trigger the events like its supposed to. What do I do to fix this?I'm sorry if I misspelled something or my grammar is wrong, I've never done well in those subjects.
Does it read the entire message string sent by the client? I have a line to write to the stream later in the code and that does not seem to be sending anything back to the client, although the code around is excuting.
i = stream.Read(bytes, 0, bytes.Length) While (i <> 0) Try ' Translate data bytes to a ASCII string.
1) Lets say I open a file in a byte array and I need to add 5 bytes of data at the beginning. How would I go in doing that? ex: attaching to arrays together.
2) How would I go in adding 1 byte of data in a bye array?
All i need to do is open part of a file in bytes. Add a letter and 2 numbers to it at the begging and a number at the end.All i need to know is how to attach 2 byte arrays together and how can u add a byte of data to an array.
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.
I'm using this code to delete all the downloads from the download folder.
Dim strUserDir As String = Environ("USERPROFILE") For Each foundFile As String In My.Computer.FileSystem.GetFiles(strUserDir & "\Downloads", FileIO.SearchOption.SearchAllSubDirectories, "*.*") My.computer.filesystem.deletefile(foundfile)
This app is just for me to use.The reason why i'm making this app is because i downlaod a lot a files and i want an easier way to delete them.
Any way to import passwords into all program downloads. For example, if I wish to give a certain user a password I can somehow insert it into a program, and it updates all the programs which have been downloaded. It just saves editing the code, then releasing another update to include new passwords for people to use. Maybe if there's someway to auto update when an update is available, it would work. Here is the coding for a password. I just need to find a way with will mass update everybody's program when I want to add a new password for another person.
Private Sub ButtonX2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Verify.Click My.Settings.Password = TextBoxX3.Text My.Settings.Save() Incorrect.Visible = True [Code] .....
I am reading data from a socket (as bytes) and storing this data in a string. Then later i need to access specific bytes within the string and do some math with them. However the bytes that I read back from the string are not what I am expecting.
I want it to do is that you input a string, then you select an algorithm (Theres only going to be one RijnDael) then you input a key, then the Initialization Vector comes from "txtIV.text" then you select the key bytes and the block bytes from the numeric up/down, then you either encrypt or decrypt.
Ok i am having some issues designing a base-class to handle generics.Caveat is i need to restrict the type put in as a Numeric type, specifically Int16, Int32, or Int64 (Short or Long).I know you can do Of T as {Structure} but i dont want to select the key bytes and the block bytes from the numeric up/down.
I keep getting a ProtocolViolationException "Bytes to be written to the stream exceed the Content-Length bytes size specified." on the following code.I've tried setting Content-Length numerous ways with no success.
Dim url = "https://domain.com" Dim req As WebRequest = WebRequest.Create(url) req.Method = "POST" req.ContentType = "application/xml"
I have been prototyping a simple site search tool.I found some online references to using webclient.download data. I have a (mostly) working prototype, but it only returns static HTML on the page that is being searched.I also would like to be able to search the contents of controls (such as text in label controls that are set at run time.) In the code below, the data in label1 is not returned.[code].....
I am trying to get my program to read async so it doesn't just freeze up while it fetches the data. I have: SR = New StreamReader(WC.OpenReadAsync(New Uri(url))) Dim html = SR.ReadToEnd.ToString It keeps throwing the error "does not produce an expression". I remember trying this in the past, only to have the same error.
I'm concatenating data files, but the problem is that I'm seeing some extra bytes where the files are joined. The new file has extra bytes. I had thought this was maybe a problem with encoding.Here are the methods that I've tried to use to concatenate the files. The first example I'm getting extra 0xA0 0x00 bytes.
Dim inputfiles() As String = Directory.GetFiles(sourcedir, pattern) Dim bufSize As Integer = 1024 * 64 Dim buf As Byte() = New Byte(bufSize) {}
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?
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"))
Probably missing something silly here, Her eis what my display looks like Sending image...(401303) I would prefer it displays as Sending image...(391 kb)
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
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?
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.
