Multiple Files To Be Downloaded Concurrently?
Oct 26, 2009
I'm writing something to download about 200 small (Around 200kb) files at a time. I pass the file urls off to a class which starts the downloads. The problem is that it'll start the download (Just creates a 0kb file) and then slowly downloads each file one by one, waiting for the next to complete despite this being a threaded class. This would be fine but after about a minute, windows removes all of the 0kb files and I'm stuck with only a few of the files being downloaded. How to get multiple files to be downloaded concurrently?
Imports System.Net
Imports System.IO
Public Class DownloadClass
Public downloadUrl As String
Public folderURL As String
[Code] .....
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Dec 14, 2009
in my button click event i ececure
If BackgroundWorker4.IsBusy Then
BackgroundWorker1.CancelAsync()
End If[code]....
after proceess completed if press the button again.i got the following error msg
This BackgroundWorker is currently busy and cannot run multiple tasks concurrently.
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Apr 19, 2012
Any way to save all files that are being downloaded trough the WebBrowser I've made in my Visual Studio 2010 to a specific location, by letting user to chose option save file without knowing where it saves. Or maybe to don't show the "save file" thing at all.
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Jan 11, 2010
i downloaded a couple of projects from the codebank about the listview and the treeview but when i unzip the zip folder,i found only the .dll and xml files present over there...
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Feb 9, 2012
I am currently working on a project, which requires to download files from the internet and copy them to certain directory's... I've done the downloading part but I can't seem to get the directory working. The directory is "special" E.G. Appdata Program Files etc., and well when I tried just using %appdata% it seemed to create a new directory NAMED %appdata% rather than actually goto appdata...
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Aug 3, 2011
I have VB 2008 Express installed in my PC. I downloaded a program source code written in VB6 but could not open the files. What do I need to do to get this codes displayed.
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Sep 5, 2011
I have a process serves as an application updater.It checks it's local cache of files and compares this against list of files online.On it's first run there are no files in the local cache and it therefore downloads ~100 of these files.[code]This appears to work very well, since Explorer confirms that all files are extracted and available.However when I later run this process again, it cannot verify the existence of 6 of these files and therefore tries to download them despite the fact that they are clearly both present and up to date.The offending code is a simple File.Exists call which appears to deny the local existence of these files, and therefore tries to get them again.The system continues to work well, but over time the continual downloading of these 6 files is going to get kind of silly.
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May 30, 2012
making a simple web browser for work eeh, what like to know is if its possible to save a file of a particular extension to a particular file.I currently use googels chrome when downloading a file it places this (regardless of extension) in a downloads folder without asking where I ant to download this too.
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Jan 28, 2011
I can only run "so many" threads concurretnly, a notion which I have seen elsewhere.As a threading novoice, how can I determine the maximum number of threads to use? Or is this a "how long is a piece of string" question? What does it depends on? Hardware config or what?
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Jan 6, 2010
On a Form, I have button which, when clicked, creates an instance then Shows another Form. If this button is clicked a second time, a second instance of the other Form is created and displayed.However, the first instance then becomes invisble - it still has an occurence in the Task Bar, but is not visible on the display.
Using the Taskbar, one can select either instance of the Form and that instance displays correctly, but, only one instance is visible at any given time (the windows are at different locations on the display and are not hidden behind other windows). What needs to be done to have both instances visible at the same time?
The computer is running Windows 7 64 bit - I don't know if this problem is present in with other Windows versions or not). Here's the code that responds to button click:
Private Sub btnPermissions_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnPermissions.Click
Dim PermissionsObject As New Permissions
PermissionsObject.Show()
"Permissions" is the Name of the Form, which is in the same Visual Studio 2008 Project as the Form with the btnPermissions button.
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Jun 18, 2012
I have a website that has highly granulised access and hence requires many web.config files. The problem is I would like to trim the menu so that only certain users will have access to certain folders. I have enabled trimming and setup roles in the sitemap, however when I access the page the menu is not show, as I am authorized to view the default page which is not in a subfolder. When I type the url of a page in sub folder's I have access.
How should I handle this:
A site map for each web.config file - don't know how this will work Removing the sub web.config file to only use a single one
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Dec 10, 2009
I know this is out there and probably illogical but I was wondering if it was possible to take multiple picture files and compact them into one file.... and then retrieve them from the program later? Way to combine any amount of image files into one file
Module Module1
Sub combine()
Dim img1 As New Bitmap("i1.jpg")
[CODE]...
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Mar 30, 2010
I'm developing an application to help law enforcement retrieve and analyze logs and other files left by the use of Pidgin (a multi-protocol messenger client). Right now I'm nearly done, but I want to add the ability to search chat logs for user-defined words or phrases and I don't even know where to begin.
Chat logs are stored as html documents in a folder/sub-folder/sub-folder/sub-folder fashion, where each sub-folder can have dozens of sub-folders inside of it, and the final sub-folder can have dozens if not hundreds of chat logs. If anybody could point me in the right direction, I'd be very grateful.
(Also, this is the first program I've written since about 2005, and I'm essentially teaching myself VB as I go. If you'd like to see what I've cobbled together so far, you can find the program here.)
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May 18, 2011
I want to perform two hashing operations concurrently on a single file, without reading the file twice. Is there some way to share the FileStream between two synchronized hashing threads? For example:
Dim Stream As New IO.FileStream("...", IO.FileMode.Open)
Dim HashA, HashB As Byte()
Dim A = New System.Threading.Thread(Sub()
[code]....
Maybe some way of caching a stream? Trouble is, I don't want the entire file in memory at once (it could be many gigabytes in size) and I don't want the file read more than once, due to speed issues. I want the file cached only sufficiently to ensure that both threads can work.For example, suppose at some point in time, thread A had read 100k of the file, but thread B had only read 20k of the file. The portion of the file between 20k and 100k should be cached; but then progressively forgotten as thread B catches up. Then again, if thread B is too slow, we might still end up with hundreds of megabytes being cached.Maybe thread A should be made to wait while thread B catches up. Maybe the ReadByte() function of the stream should block for a while if one of the threads is too far behind?
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Aug 18, 2011
I'm trying to copy multiple excel source files into one excel file. My current code is working only for 3 source files..If more than 3 files are there, it doesn't copy the data but creates blank work sheet in the output excel file. Lets say I have a source folder with 5 excel files. Each workbook contains one worksheet with data. It copies upto 3 worksheets along with data into output excel file.
Lets say excel1 contains A as work sheet, excel2 contains B as work sheet ,excel3 contains C as work sheet ,excel4 contains D as work sheet ,excel5 contains E as work sheet .Now my output excel file should look like..OutputExcel with A, B, C, D, E along with respective data.But my current code is giving output as A,B,C worksheets along with respective data but its creating blank sheet1,sheet2 in place of D & E.
SSIS Script Task Vb.Net Code:
Public
Sub Main()
Dim filePath
As
String =
[code].....
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Nov 13, 2009
how I could make an application in visual basic 2008/vb2005 that detects when a new file is downloaded. One of my old time friends created the same app with visual basic 2008. It notifys you when your attempting to download a file. For e.g: I try to download "aim6.exe"
it will show a message: "C:UsersMATTST~1AppDataLocalTempsXx0Fd31.exe.part is attempting to be downloaded"
I think it uses a file system watcher.
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Mar 26, 2009
I downloaded and am using SharpZipLib in VS 2005 to try to unzip a disk file that is zipped with an extension of .gz using the code below:
[Code]...
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Aug 6, 2010
I have an xml file that I download from a secure site every 5 minutes, I have the application set to download at 3 minutes after the hour so it runs at 3, 8, 13, and so on. The file is supposed to be there within a minute after the 5 minute increment has occured however this is not always the case, so I changed the download time from 2 minutes after the hour to 3 minutes. However I am still running into issues with it not being there even then. What I want to do is validate the downloaded xml file to ensure that the data is there and if it is not wait 10 seconds and rerun the download again.
if the file is valid it will call the SQL import Sub (),if not it needs to delete the existing file and rerun the download sub again.The problem I am having is that all the examples that I have seen when I google are for validating the xml file prior to upload or upon the xml files creation.
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May 13, 2010
I have made a downloader in Visual Basic 2008, using the Webclient that is built in. This is the code i have to download the file[code]...
So instead of just saving it to C: automaticlly, i want a Save dialog that the user can choose where to save the file.
I have searched for almost a hour now, but i can't find the proper code for my purposes.
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Apr 8, 2005
I have downloaded Chilkat component from the net and I'm trying to use it in my project. This is my VB
CODE:
But it simply won't work. It always throws that exception and I don't know why. I tried debugging and it sad that the value of bundle is nothing. The error is on this line of VB For i = 0 To bundle.MessageCount - 1
The interesting thing is that it worked ONE time only. And after that time, never again. What's the problem?
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Nov 5, 2009
I am working on a website at the moment which is displaying a strange bug with generated word documents. The site has a feature on it which allows the user to download a word document containing information related to their visit. This file is generated via some vb.net code and takes an xml template of the final document and inserts the relevant content required.
The strange behaviour is that on some machines the .doc file generated displays fine and on others it displays as XML when opened in Word. Both behaviours have been seen in the same version of Office (2003) but on seperate machines. My question is really whether the error lies with the set up of word on the individual machines, or whether there is an error in the code.
The code to create the file and download it is as follows:
Response.Clear()
Response.ClearHeaders()
Response.AddHeader("content-disposition", "inline; filename=MyNewFile")
Response.ContentType = "application/msword"
[code]....
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Oct 10, 2010
I have a list of object that i loop through, and in this loop i have an async webrequest that is getting a response from a site, according to the current object's data.
How can i wait for each async request to complete b4 going to the next object in the list? Should i use application.doevents?
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Jun 11, 2011
I have recently programmed a site that enables a user to upload and download files to and from an FTP site.
I now wish to take it further by having an email sent out to a specific email account (Outlook 2010) confirming that a file has been uploaded or downloaded along with the file name.[code]...
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Dec 18, 2009
I'm just starting out with VB and have downloaded and installed VB Express 2008. I'm researching and trying to wrap my head around programming in VB before I start working on any projects. I have a little bit of experience with ASP Classic so some of the syntax looks familiar, but I can't get a handle on database integration. Let's say I am creating an address book. Each installation is a stand-alone (no network connectivity). How are databases used in this situation? Are they built using VB Express and packaged into the installer or can you create them separately (using either Access or MySQL) and then package them into the installer? What is needed to read and write to these databases? Are there extra bits of software that need to be packaged into the installer to allow access to the databases?
What if this application does connect to a centralized database (let's say a MySQL or Access database on a web server). Is the connectivity handled the same way? Sorry for so many questions, but I just can find the answers I'm looking for when searching. I'm not necessarily looking for the actual code to do this, just an explanation of how it's possible (or even a link to some examples/tutorials).
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Oct 23, 2009
I am trying to use Vb to call explorer to open some web pages that I already downloaded. I use this command.
Shell("C:Program FilesMozilla Firefoxfirefox.exe G:BlogsBlog35242+0")
it works fine for this file. However, I have tens of thousands files to open. So I need a variable to replace "G:BlogsBlog35242+0". Like, I write blogaddress="G:BlogsBlog35242+0" and Shell("C:Program FilesMozilla Firefoxfirefox.exe blogaddress")it doesn't work.I write, Shell("C:Program FilesMozilla Firefoxfirefox.exe" &blogaddress) it doesn't work either.
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Jun 12, 2010
i have a function which grabs images from urls, using this function:
Public Function webDownloadImage(ByVal Url As String, Optional ByVal saveFile As Boolean = False, Optional ByVal location As String = "C:") As Image
Dim webClient As New System.Net.WebClient
Dim bytes() As Byte = webClient.DownloadData(Url)
[code]....
All the examples ive found so far point at using imagemagik or another add in.
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Jul 26, 2010
I am trying to put something in my program so that when a button is pressed a file will be downloaded from a website. When that is done downloading add that folder to a location on the hard drive.
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Sep 24, 2010
I'm trying to make an auto updater. It kind of works, but I've got some problems.I need to make the download threaded or something so you can use the program while downloading. I've tried the background worker and now the Application.DoEvents(), but I didn't get it to work.
The second problem is that the program crashes after having downloaded in a while. It may be because it isn't threaded, but I don't know.Anyways, here's my
vb
Imports System.IO
Imports System.Net[code]....
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Dec 22, 2009
The string is coming from this [url]...
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Sep 22, 2009
I would like to convert a image query, found here [URL]..In vb2005.net to the xmldocument which I can then cruise around and grab the data with, current code using the webclient isn't giving me a good xml document to use. Any ideas how I can fix this?
[Code]...
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