Fast File Transfer Using .NET?
Mar 15, 2011
I need to transfer files from one server to multiple cients (using the internet) in the fastest possible way in .NET . What are the different types of transfer protocols which can be used in .NET or VB.NET so that the files are sent in a very short time ? I have tried using FTP, but that is slow because it requires authentication, handshaking etc. What i want to know is the options which we have in .NET for sending files in the fastest possible way between a server and multiple clients.
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Jul 16, 2011
I need to transfer a block of pixel values as quickly as possible to a picturebox control. The data will be in a byte array representing 512 pixels by 4 lines. The data is greyscale values from 0 to 255 but I could easily store each value three times to represent R, G and B if that made it easier/quicker to write the values to the picturebox.I've used fastpix (by Vic Joseph "Boops Boops") in the past but this seems more geared towards fast plotting of individual pixels and as I have a pre-formatted block of pixel data I was wondering about alternatives. I've done a bit of research and BitBlt seems interesting, but can this be used with a byte array as the "source"? All the examples I've seen are for transferring/merging between bitmaps/pictureboxes. How about Direct Memory Access? I just need a simple "brute force" method of getting my pre-formatted data into the picturebox. Oh, when I say "fast" I mean I'd like to plot my 512 x 4 pixels in less than 10mS.
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May 22, 2012
So, I have a task where I need to basically copy about 600,000 PDFs, some of which can be 5-6 MBs from one network fileshare to another network fileshare on another pc.Now, I crawled through the directories, sub-directories etc etc and created what I call a Filename/Filepath Database lookup table. This table contains the name and the unc fileshare path of each file which comes in handy.I have used Multi-threading and File.Copy to "copy" the files and I getting about 45K files per 4 hours which I need to be significantly faster then that and I am seeing performance degrade over time
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Mar 22, 2011
Just wondering if in the net (VB) world only option for file I/O is the Stream reader/writer. In the VB 6 world we had the slow FSO and we had the native file I/O. As far as speed, mostly concerned with writing few lines of data to a file each second, which may continue 24/7 but each day would have a new file. What are the options available in the net world (that is applicable to VB .net 2003) that can give me the best speed performance?
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Feb 5, 2009
I have a coma separated text file with loads of records. Usually when we read a text file we start from the first line and go towards the last. I know that there will be x comas per record.But I want to start reading from the last line and then towards the top. This enables me to stop before I reach the top (depending on the data).
What would be the fastest way to read a text file in VB.NET?. I am using VS2008. Basically I want to read from last line and go upwards and stop when I want. I may not need to read the entire file.
[Note: I want to store data in an array and not show it in some textbox]
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Dec 31, 2010
Is it possible to split a file into like 10 parts, and using multithreading copy it faster and then put it all back together? Will the speed increase or will it stay the same?
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Feb 24, 2012
What is the fastest way to retrieve all the files within a directory (including sub folders). Currently I am using this function:
[code...]
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Jul 14, 2011
When you need to do random access to the lines of a text file, the regular solution is to put those lines in a list and access them in that list.But doing this if the text file is large creates a large memory overhead and may cause some memory stress on the application.This class maps the file and provide the ability to read any particular line in the file at a random position, without the need to read or put in memory any other line but the desired line. The only memory overhead involve is the 1024 bytes buffer of the base stream.Even if the file mapping can be a process that consume a noticable amount of time if the file is very large ( ~ 5 seconds for each 100,000,000 caracteres) , once the mapping is done the access to a particular line becomes instantaneous regardless of the size of the file. (The file mapping can always be done at a convenient time (ex when the process load) and can be done on a worker thread The class is base on a StreamReader to support the differents Text Encodings Example uf usage ( As I say, if the file is very large, dont do it like that, but declare the class at a convenient time)
Imports Reader = System.IO.MyStreams
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[code]....
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Feb 9, 2011
I have a windows form which to summarize lets the user open a file containing 32 bit hashes, then search for one of them. The hash is then converted to its string representation. The application is giving the results I would expect but I'd like to make it execute faster than it does now; some files can be pretty big > 100 MB.
I'm doing the file read using a BackgroundWorker object to display progress updates and ensure that the UI is available during the process. But for that i need to add a System.Threading.Sleep(1) instruction in the loop; otherwise the application freezes with big files. And System.Threading.Sleep(1) creates a noticeable lag. Any suggestions on how to make searches fast without freezing the UI? Getting speeds comparable to hex editor programs for example.
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Mar 20, 2012
I will use the Background Intelligent Transfer Service (BITS) to transfer files from a client (laptop) to a shared folder on a server within our local network.The problem is a very slow network bandwith, if we transfer a file, the other clients canīt work, all requests to other clients (application) or viewing internet pages needs a long time.My idea is to use BITS in my tool to copy/transfer a file from client to server, also I hope to get more performance for the internet requests.
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Apr 11, 2011
I have an excel file i want to copy all the row of that excel file into a .txt file.In the txt file the separator is comma.
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Feb 23, 2012
am writing the pgm using vb.net to get the file from reomte machine & store it on local machine using FTP . but am always getting an error like "remote machine returned an error :(550) file un avaliable (e.g , file not found, no access)
Dim reqFTP As FtpWebRequest
Dim filepath As String
Dim filename As String
Dim filename1 As String
[code]....
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May 8, 2010
I want to read a file and write it into another file.
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Apr 26, 2010
I wrote some code to share files throughout my network. The thing is that i don't understand how to determine how much the client has sent already and how much is left. I have posted my code below so you guys can see what I'm talking about.[code]...
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Jun 22, 2010
I wrote a code to send file as below:
Dim objXMLDoc As New XmlDocument
objXMLDoc.Load("C:InetpubwwwrootXMLSchema_TestXML1773777.xml")
Dim blnResponse As Boolean
[code].....
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Mar 21, 2011
I am writing a program in vb.net 2008 and need to be able to send and receive files using Zmodem through the a comport. I have search the net and have not found much to do with Zmodem in VB.net. I am already using the System.IO.Ports.SerialPort to send and receive commands through the comport but how to send or receive a file using the Zmodem protocol.
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Oct 28, 2008
I want to transfer a file from one computer to another computer by giving the port number and IP address. There will be an other software waiting for the file to be received.
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Aug 15, 2010
Basically I want to take My Client.Then for example Lets say in my client I have "A = 1" Then my 2nd file which has random data in it.So Client= My Client File = The File which I want in the end result
How could I Inject "A = TextBox1.Text" from Client to File.I heard it's called "End Of File" or something like that.
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Mar 11, 2010
How I can send file from server to another server in network??
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May 3, 2012
I want to transfer the file through socket in vb.net using Socket .
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Jun 17, 2009
the code I can incorporate in my application which will allow me to transfer data from my listview to a notepad or .txt file.
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May 9, 2012
I'm studying how to use Visual basics 2010, and I have been asked to create a program that transfers a audio file to one machine, then plays that file when it receives it on the other machine. I have made a basic file transfer, but when I install it onto a computer, the server crashes for some reason. But it will work on some computers. Here is my code for the server:
I also have to make the program so that the client can click a button and then it will play a preset audio file. (example: User clicks button to play a fire drill)So to sum it all up, The server app goes onto the computer that will be playing the audio and the client app allows you to send audio files to it and play
[Code]...
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Jul 9, 2010
I am writing a chat program and im adding a transfer file function but Ive hit i bit of a snag..The way my program knows its a file coming and not a regular text message is i added a 3-6 bytes prefix depending on what is being sent.
[Code]...
Ive tried the copyto method but since my file byte array is empty it throws an exception. If i wasn't clear with something let me know and i will try to explain better.
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Nov 27, 2009
How would i send different types (.png/.bmg/.mp3) of file over a tcpconnection (server / client)
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May 28, 2009
I'm encountering problems when i want to download files from my server to my clients. My client is able to connect to my server but it will never transfer the file over to my client and i am unable to solve it.
[Code]...
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Feb 23, 2012
I am writing the code using vb.net for file transfer from remote machine to local machine with out using any third party tools
This my code
Dim reqFTP As FtpWebRequest
Dim filepath As String
Dim filename As String
[Code].....
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Oct 30, 2009
Is the FTM available for .net users to use on our web solutions or sites?I have some large install files on my site that the regular download will quit in the middle.the ftm at least allows for interruptions.I tried the FTP route, but turns out most users out there have no idea what ftp is. I saw a library that eluded to IDownloadManager, but I wasn't sure if this was the same thing as the ftm.
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Mar 17, 2011
I'm transferring from one FTP (a Dev site) to another FTP (a Test site). Spare me the thoughts of changing this process. In any case, here's my method:
Public Function TransferFile(originalFile As String, destinationFile As String) As String
Try
'FileStream for holding the file
Dim uploadRequest As FtpWebRequest = WebRequest.Create(destinationFile)
uploadRequest.Method = WebRequestMethods.Ftp.UploadFile
[Code] .....
This works perfectly for ASPX files and their .vb code behinds. When we try to transfer .DLL files, they show up on the server as 0 bytes, and sometimes actually transfer. The problem is that, despite being the same size as the original, they act as if they are corrupt.
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Jun 16, 2011
1. How much load or data size our custom encryption/decryption algorithm can handle? E.g. what's the limit of file size that normal encryption/decryption algorithm supports.
2. What's the best way to use encryption while file transfer via internet?
3. Where and when encryption and decryption has to apply while uploading and downloading content from internet(Hosting on client or server machines)?
4. What type of algorithms suites for above approaches?
5. How much time it takes to encrypt / decrypt data for 10 MB, 100 MB, 1 GB etc
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Jun 8, 2011
I was wondering if there was a way to transfer a file to another device over bluetooth using vb.net.
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