VS 2008 File.Copy And Fast File Copying?
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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Aug 11, 2009
Here's my
[Code]...
During the file copy, Label2 isn't being updated. In fact, my whole form goes non-responsive. How can I fix this?
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Dec 14, 2009
I cannot do the following:
File.Copy(Application.StartupPath & "wait.exe", "%APPDATA%WAIT.EXE")
Can someone remind me how I got about copying a file to that location?
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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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Mar 27, 2009
I've got an app which uses a background worker to copy files. It works fine but some files are quite large and it "appears" as though the app isn't doing anything. Is there an alternative to the File.Copy method of copying files so I can report on the progress of individual file copies, like the percentage complete?
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Jul 11, 2011
im trying to create a dialog allowing the user to change the image currently being displayed to something they choose.the error occurs when i hit the system.io.file.copy().heres the function.
This is the event that calls the function to copy the file - its works fine
Try
'get integer value of selected movie
[code]......
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Oct 31, 2011
I'm using "My.Computer.FileSystem.CopyDirectory(...)" to copy large directories (30-50gb) from one mapped share folder to another. Using "FileInfo.length" to add up all file and subfolder sizes, determines the 'origin directory' size just fine. However, if I use the same method for determining the size of the 'destination directory', mid copy, it returns the full file size, despite the copy not yet being complete.I'm at a loss as to why, as this method works fine in testing, going from a local PC t
Private Function FolderSize(ByVal dir As String) As Long
Dim Size As Long = 0
Dim d As New DirectoryInfo(dir)
[code].....
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Jan 19, 2011
I have an application running access constantly whilst using it. I was hoping to backup the file each time i close the application. What checks do i need to do to make sure when i close the file that it is safe to copy the file without getting errors for copying a file when still in use.
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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 14, 2010
In my current program I need to be able to copy a text file, renaming it to default.txt, and overwriting the existing default.txt.
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Feb 19, 2012
how to copy a file, for example a file from C:imagesample.bmp and saves it using a folderbrowserdialog that automatically save the same filename.
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Dec 15, 2009
I'm trying to copy a file from my.resources to a user directory thus:-
HTML
My.Resources.MyFile.Copy("C: empabc.xml")
I've also tried:-
HTML
File.Copy(My.Resources.MyFile, "C: empabc.xml")
Neither work.
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Aug 5, 2010
I have a program that uses IO.File.Copy to copy files from point a to point b. Its slow, which is fine because there rather large files. I was wondering if there is way to get an estimate time to copy a particular file(s).
Example: File a will take 1 hour to copy, File B will take 30 minutes to copy. Estimate Total Time: 1 hour 30 minutes.
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May 21, 2009
I have the following code where I make an copy of my database that I use. the code executes 100% but the problem I have is I'm not able to access my database afterward.I get a "Cannot start your application. The workgroup information file is missing or opened exclusively by another user." and so if I restart the application it all works fine again.I'm certain the reason is because I can only access that database using a specific account name and password which is not account I'm logged in with.What i want to try is to default that database mdb to the point where no user is accessing it, or to reassign the the only account name that can access it to that database mdb. I've tried playing around with file security but had no luck.
Private Sub cmdBackup_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdBackup.Click
BackupDialogDB.DefaultExt = ".mdb"
[code].....
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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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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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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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Feb 21, 2011
I have got the following code to copy a file from one location to another.
Dim strPath As String = txtUploadLocation.Text
Dim strFile As String = txtUploadFile.Text
Dim FI As New IO.FileInfo(strFile)
Dim SR As New IO.FileStream(strFile, IO.FileMode.Open)
Dim SW As New IO.FileStream(strPath, IO.FileMode.Create)
[Code]...
Now obiously this is saying a permissions problem however i have checked the permissions and the user i am runing it from definatly has write access (full control as im a system admin., I have also just tried copying it to the local maching instead of the server in a remote location and it gives me the same error.
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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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Jun 12, 2011
I am trying to copy a file from 1 location to other location with a new name. The new name should be like "Oldname + date & time". I wrote the following code but getting error that the Given path format is not supported Imports System.IO[code]...
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Apr 27, 2010
I have a form, who should show me a image.In the form, I put a Open File Dialog, and select the image.After this, with the filename, I can open and show the image.But, What I wanna do do is the following:In my application folder, I wanna create a folder named "Images". And, after the user select the image with the Open File Dialog, I wanna copy the image to that folder.After this, my app opens all the images from this folder.I can I copy the file to the folder images?
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Oct 8, 2010
I would like to copy a file from the serve to a folder that is specified in a textbox.
CopyFiles("\agb1datSOFTeasy-1390171.txt", TextBox1.Text)
Private Sub CopyFiles(ByVal sourcePath As String, ByVal DestinationPath As String)
If (Directory.Exists(sourcePath)) Then
For Each fName As String In Directory.GetFiles(sourcePath)
If File.Exists(fName) Then
Dim dFile As String = String.Empty
[Code] .....
The problem is with the destination. The destination is selected by a select folder dialogbox. I want to copy the file from the server to the folder specified in the textbox.
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Apr 18, 2009
What I am trying to figure out is a way to copy a file and paste it in another location. So that there will be the original file in the user set location, and then a duplicate of that file in, say, the "Program Files" folder. I would also need some way to check if the file exists to, so that it doesn't keep creating a new file each time the program starts up.
to sum it up: I need to be able to copy a file to a predetermined location and check if the file exists, and if it doesn't, it will copy the file over to the location.
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Jun 5, 2010
I'm writing a program that I want to attach another program (.exe) to. I tried adding it as a resource, but I can't seem to get the resource to export out to wherever the program is running.
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Apr 26, 2010
I have a program where by I want to copy a temporary (in coming file from an email attachement) and I want to paste this onto my form (listview control perhaps??)
How can I paste this on there so when I click a button I end up saving this file into a selected loction.
I've google search this with no luck.
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Nov 3, 2009
I am helping a friend convert files from floppy to CD. The files are in WordPerfect for DOS (8.3)format. she named the files as follows: name.month eg; Baker.jan. if there were more than 1 "Baker" files in the same month she named them baker1.jan,Baker2.jan etc... She then copied them to floppies and when one got full she started another. The problem is I have multiple instances of the same filename on different disks so when I copy to my HD windows asks if I want to overwrite the files. I have been writing the names down and renaming them manually. Is there any way to automate this process? I would need to perform the following:
1. Check if floppy filename exists on HD already
2. if it doesn't, copy to HD
3. if it does, is it the same file or different file with the same name (file size has been a good indicator so far)
4.If it's the same =>ignore and go to next file on disk
5. if different, rename then copy to HD then go to next file
6. repeat until all files have been copied
I have 300+ disks to do this with and it is very time consuming.
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Jun 24, 2010
I'm hoping someone can point me in a different direction. I'm copying files from one computer to another. Both are on the same switch connected at 1Gbps here's my problem:Using File.Copy with a list of files I can get an average transfer speed of ~60Mbps Using multiple background workers with a split list of files and File.Copy is slower Using the FileStream read/write method I get an average speed of ~55Mbps with a 8M buffer
What can I do to get a faster transfer rate? I'd be happy to hit 250Mbps over the LAN.
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Aug 12, 2009
Here's the (Timer1's interval is set to "1" in the designer, and it is set to "Enabled" in the designer as well.)
vb.net
Public timeElapsed As Int32Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
timeElapsed = 0
Timer1.Start()
[Code]...
The issue is, timeElapsed always comes back as equaling 0, so fileCopySpeed always equals infinity. Also note that test.dat is a 100MB file. There's no way it's getting copied in under 1 millisecond!
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Aug 5, 2011
I have a workbook (Workbook1) that runs through some steps using visual basic, which ends up opening another workbook Workbook2). Once Workbook 2 is opened, I need to copy a section of data from it, into Workbook1 int a specific worksheet. I was able to do this by recording a macro, but the challange is, the name of Workbook 1, and Workbook 2, will vary by User. When I created the macro it uses the files as they are currently named. The section of code is below.
[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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