WebClient.DownloadFile Not Working Consistently?
May 23, 2012
I am trying to write a program to download an image at certain time intervals from a website based on a start time, end time and the time interval. I am trying to use 3 timers to accomplish this. I want to be able to kick the program off and leave it running until I stop it. My code seems to work fine if I set the time interval for something like 2 minutes, etc. and sit and watch it, but if I set it for an hour and leave it alone, it gives me almost sporadic results.
I set it to start at 10 pm last night and end at 5 am this morning with an interval of 1 hour. It downloaded an image at 10 pm, 11 pm, 12 am, 1 am, 2 am, and 3 am and then there were no images for 4 and 5 am. I have tried this multiple times with different time spans, and seem to get sporadic results. Any insight would be greatly appreciated. Here is my current code:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If TextBox1.Text.Length = 0 Or cmbStartTime.Text.Length = 0 Or cmbEndTime.Text.Length = 0 Or TextBox2.Text.Length = 0 Then
MsgBox("You must select an image destination, start time and time increment.")
Else
[code]....
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Dec 21, 2011
I have one problem with WebClient.DownloadFile
On asp.net server I have page with this code:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
If Not String.IsNullOrEmpty(Me.Request.QueryString("Tool")) Then
[code].....
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May 30, 2012
I'm automating downloads. I was getting this error quite a bit using Webbrowser to navigate to a PDF (various PDFs at various websites). In other words the PDF was already on display in the browser when I called WebClient.DownloadToFile. I got a LOT better results when I desisted from WebClient and switched to this API (just pass in the two strings along with zeroes for the other parameters).
[Code]...
And yet Webclient seems oriented for only two entries (username and password). How do you set up the credentials for three entries? I hate to abandon WebClient, but at this point I just don't know how to make it work.
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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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Jun 10, 2011
How to download multiple files with a wildcard pattern using webclient DownloadFile? Like project* from [URL]..
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Feb 13, 2012
I have an ErrorProvider on a form with a DataGridView.The Binding Source for the DGV points at a single table in the DataSet (which hooks up to an underlying Access DB).The table has two columns:
1) Autoincrement PK
2) Text field, <=25 chars, unique, can't be Null or empty string
I test for string length (>0 and <=25) in the DataSet.Table.RowChanging event.If it's out of range then I use e.Row.SetColumnError, that passes the error to the ErrorProvider / DGV on the correct row and DataSet.HasErrors returns True. All good, no problems.
I test for uniqueness in the DataSet.Table.ColumnChanging event.If it's not unique I can set the error with either e.Row.SetColumnError or e.Row.RowError; Now it gets complicated since sometime this makes the ErrorProvider / DGV show the error and sometimes not, it depends on whether the DataSet keeps the Unique = True constraint of the underlying DB.
Why would I have the DataSet be False for Unique when the DB is True for same constraint? So that the user interaction with the form has the minimum of dialogue box based interuptions. I am trying to design a system whereby all issues / errors are reported
to the user as they interact with the form in a subtle way, allowing them to keep working but trapping errors before any attempt to Save from the DataSet to the DB.
So, if the DataSet keeps the unique constraint then when you insert the new (duplicate) row the DGV throws its DataError event, a default dialogue appears, behind which the DGV has the ErrorProvider icon on the correct row. However, since the DataError event
causes the problematic change to be rolled back, the new row is removed and the error disappears.
If I change the DataSet requirement to Unique = False, then SetColumnError does not cause an ErrorProvider icon to be shown and DataSet.HasErrors returns False. I can improve upon this slightly by using RowError, this causes DataSet.HasErrors to return True but the ErrorProvider icon still does not show.Further, when using Unique = True on the DataSet, and editing an existing row to be a duplicate of another, the behaviour is the same, DGV.DataError event, roll back of the change but the ErrorProvider icon remains, despite the row no longer being a duplicate and DataSet.HasErrors returns True. The text of the the ErrorProvider tooltip is the one from SetColumnError, not RowError.So, the behaviour of SetColumnError is affected by the state of the DataSet field Unique constraint?
Unique = True
SetColumnError affects the DGV / ErrorProvider and DataSet as expected.
(RowError behaviour unknown)
Unique = False
[code]....
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Dec 27, 2011
I'm trying to access a web server to download a file, but when I run the statement gives me the following WebException:
[Code]...
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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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Feb 12, 2010
How do you check if webclient.downloaddata is working? I mean what if the site you are trying to access suddenly turns down. How do you avoid getting an error? Below is an example
Dim webclient As New WebClient
Dim eIP As String
eIP =
[Code].....
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Dec 29, 2009
[Code]...
i am not getting any errors either i am using Imports System.Net
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Apr 29, 2011
I am uploading a file from a C# application to an ASP.Net website, both written by me so I have access to the code.But, it is working for a text file (1KB) but not for a MOV file (77MB).
In both cases, I am using UploadProgressChanged to get the progress. The TXT file goes to 100% while the MOV file goes only till 50%. When done, I only find the TXT file saved on the server but not the MOV file.
Why is this happening? How can I get it to work?
[Code]...
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Jun 1, 2012
I do the same thing with URLdownloadtoFile: IT WORKS.Wih the WEBCLIENT part I just DO NOT GET the Text file from the PHP/MYSQL server: I only get message "Invalid Username/Password or no list download permission: ||"
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim urlStr1, urlStr2 As String
Dim fileToStoreStr, fileToStoreStr1, fileToStoreStr2 As String
[CODE]...
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Jan 19, 2011
I cannot seem to open a new window in WPF consistantly. It will work one time, and then the next time I execute the same script, it throws the following exception:
XAMLParseException occured 'Provide value on 'System.Windows.Baml2006.TypeConverterMarkupExtension' threw an exception.' Line number '4' and line position '208'. {Cannot evaluate expression because the code of the current method is optimized.}
Here is the script:
Dim Window As Window = New GAME_WINDOW
Window.Show()
Yes, "GAME_WINDOW" is a legitimate WPF window. Here are the first four lines of XAML code for the window I'm trying to open:
<Window x:Class="GAME_WINDOW"
xmlns="[URL]"
xmlns:x="[URL]"
Title="Operation SpyRat: Word4Word" Icon="/VBP-WORD4WORD;component/alicia.ico" WindowState="Maximized" Background="Black" xmlns:my="clr-namespace:VBP_WORD4WORD">
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Oct 13, 2010
Cannot Consistently and Reliably Write to a Custom Event Log from DotNet
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Jun 4, 2009
I have a timer control that sends data to a hardware every 3 seconds. I sent 6 bytes of data. In return I am expecting 8 bytes of data in DataReceived event. First time I send 6 bytes of date, in DataReceived event, I get the expected 8 bytes. Then in next 3 seconds, again the expected 8 bytes of data is received. But after that I find that DataReceived is fired 2 times: first time I get 6 bytes and then I get 2 bytes. After that I again get 8 bytes as expected. So in short, 2 times I get 8 bytes as expected and 6 bytes and 2 bytes and again 8 bytes. This pattern is repeating continuously. Why? Is there any reason why I cannot get all 8 bytes everytime? Note that the code is in vb.net 2008
Code in button btn_Start ()
'Set serial port parameters
x.PortName = "COM1"
[Code].....
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Jul 12, 2009
I've got lots of textboxes and such bound to a BINDING SOURCE - the datasource of the CASEFILEBS is set like this:
[Code]...
Seems "data saving" is not always being consistently done - sometimes a field change never makes it into the underlying datatable - sometimes certain field changes never make it to the DB. I believe I'm doing something fundamentally wrong that when fixed will clear up some of these issues.
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Oct 22, 2010
I am using Visual Basic 2010. I use successfully webclient downloadfile to download a file from a remote website. Now I want "protect" downloading so one have to "login" before to download the file. (i.e. I should like it is not possibile to simply type [URL] to download the file and so the downloading is possible only by my VB app.) I "protect" the website by a login page. I try to use webclient.credential(username,password) but the system message is error HTTP 404 (page not found).
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Mar 23, 2011
recently discovered the My.Computer.Network.DownloadFile method and would love to use it to download files from a website (https://www...). I can include a username and password in the DownloadFile parameter list,but will it send the password in plain text? If so, is there a way to send an encrypted password?
There seem to be many ways to download files. What are the advantages or typical uses of each?
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Apr 23, 2010
I have tried using the My.Computer.Network.DownloadFile method but unfortunately it is slow.
Executing the simple command below takes ~5-10 secs, which I would say is a lot longer than expected for downloading a 9 kb file.`My.Computer.Network.DownloadFile("http://www.google.dk", "j: emp est.html")
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Mar 29, 2012
I'm a beginner to Visual Basic, and I made a simple program, however I want to put a 'check update' button in it... It consists of downloading a txt file that contains three numbers, if it match with the version of the program it says 'you already have the most up-to-date version' or else it asks you to download the update and then bring you to the dev blog of the program I made, however, when I download that file, it brings me a blank txt file instead of the one I uploaded into the site. By the way, I'm downloading it through HTTP.
[Code]...
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Apr 11, 2011
I have a small dilemma... how can I see the download progress when using My.Computer.Network.DownloadFile
My.Computer.Network.DownloadFile("http://some_url.com/a_file.txt", "the_file.txt")
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Mar 24, 2012
I'm trying to download a file from the internet by clicking a button in MS Access.
I'm trying to use My.Computer.Network.DownloadFile as described here: [URL]
Private Sub Command2_Click()
My.Computer.Network.DownloadFile("http://www.example.com/temp/xml_test.xml", "C:xml_test.xml")
End Sub
but the 'Microsoft Visual Basic for Applications' IDE that I'm typing this into seems to have no idea what I'm talking about (text just turns red).
Can I just not do this through the built in VB editor or can I simply load a library or something to make it work?
Sorry but I'm very new to VB and to Access so search results are not specific enough for me to understand - lord knows I've tried.
I'm using Access 2010 but the DB was created in an previous version - not sure if that matters.
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Dec 10, 2011
My.Computer.Network.DownloadFile("http://MyDomain.info/MyFile.zip", SaveFileDialog)Hi, the above don't work, what i need is for it to popup a savedialog for the user to browser for a location to download the file
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Feb 24, 2009
Well my Application should download a File from my FTP when i Click Donwload but i am having Problems it doesn't really Download it good:
Dim clsRequest As FtpWebRequest = System.Net.WebRequest.Create("ftp://------/public_html/----/" & lb_1.SelectedItem & "/" & "Firmware" & "/" & lb_3.SelectedItem)
clsRequest.Credentials = New System.Net.NetworkCredential("------", "-------")
clsRequest.Method = System.Net.WebRequestMethods.Ftp.DownloadFile
[code]....
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Feb 6, 2009
The below code for some reason isn't working with filefront. I'm grabbing the URL that returns the file to download but the wc.downloadfile() code doesn't download the file. It creates an empty file called 100.rar in my temp directory on C: but doesn't have any data. Is there something I'm doing wrong or is filefronts redirect messing something up? If I put the URL I get with the fixUrl variable, it pops up the file to download in my internet browser fine.
Imports System.Net
Imports System.Windows.Forms
Imports System.Security.Permissions
Imports System.Text.RegularExpressions
Imports System.IO
[Code]...
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Jan 30, 2011
I try to download a file by using the My.Computer.Network.DownloadFile 'command'. The path i use is this: [URL]. Everytime i want to download it, it downloads the HTML file of this zippyshare page! I want just the .mp3. How can i do that?
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Nov 6, 2009
I have a problem when i use My.Computer.Network.DownloadFile from a iseries share path
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Jan 1, 2009
How do I have it overwrite the file if it already exists with My.Computer.Network.DownloadFile?
Here's the code for where its needed but, this is not all of the code
My.Computer.Network.DownloadFile _
("http:mirror.cc.vt.edu/pub/mozillaseamonkey/releases/1.1.14/seamonkey-1.1.14.en-US.win32.installer.exe", _
"C:\Program Files\Warez-One Package Manager\Downloaded Packages\seamonkey-1.114.en-US.win32.installer.exe")
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Sep 22, 2010
Any way to set (force) using binary or text for ftp in My.Computer.Network.DownloadFile?
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May 7, 2011
I use this line to download files: My.Computer.Network.DownloadFile(VideoFilename, SaveLocation, "", "", True, 8000, True But if a users cancel the download my application crashes. I searched Google but there's very little info about this problem. I tried with: My.Computer.Network.DownloadFile(FilenameMP3, SaveLocation, "", "", True, 8000, True, FileIO.UICancelOption.ThrowException, FileIO.RecycleOption.SendToRecycleBin()) But that line of code doesn't work. I need to get rid of the file when a users cancel
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