How do I create 7-Zip archives with .NET?
I'm looking for ways to do compression and decompression in 7z format via code in VB.NET and C#. Is there any library or .Net code for this purpose?
I know there are GZipStream and DeflateStream in .Net but I want 7z format for better compression ratio.
some link or could that could explain the way it could be done.
View 1 RepliesI'm currently working on a utility software, file compression, with VB.Net. And using an open source library to compress and decompress files - DotNetZip - and already running.
My friend told to make it unique and not traditional, that I make the output compressed files cannot be opened with other compression software. Now my question is... is it possible that way? Using an open source library which the output format is ".zip"?
I first thought that changing the file extension of the compressed file to unknown format so it can't be opened when you try to decompress it, unfortunately, using the "Open With..." function of windows it could still be decompressed.
Is it really possible? OR what other features can I add that WinZIP doesnt have yet? I compared my work to WinZip since the same output is ".zip".
i wanted to ask is there any means i can compress a video file(.avi) to a small size than original.Which API should i use(except the DirectX)..?Is DirectX advisable?
View 1 RepliesI'm trying to compress a file in .NET, but having some trouble. The zip file is created, but it's only 1KB and no files are within the zip file. Basically, it's not working for some reason and I'm not sure why.
Public Sub CompressFile(ByVal fileName As String)
Dim strOutput As Stream = File.Create("zippedFile.zip")
Try
Using (strOutput)
Dim strInput As Stream = File.OpenRead(fileName)
Using (strInput)
[Code] .....
I would like help to compress a file with zlib. I have have searched google for ages and found losts of examples but i can't get any to work in VB 2008 Express. I am also not sure which version of the dll to use as there seems to be a few for VB.Can someone post some code that will work in VB 2008 so i can see how to do it and also a link to the dll that you used.
View 5 RepliesI'm wanting to make a program to rip dvd's but more importantly to store them so the user can watch them when they want. To keep the cpu's memory down I figured I can compress the dvds when the person just has them sitting there and then decompress them when the user wants to play them. I've kinda looked into gzipstream, but would that really work? Should I take a different route?
View 6 Replieswhich algorithm used for voice compression mailing and decompression
View 2 RepliesI'm willing to create a program that will determine the size of a file imported in OpenFileDialog After a RAR Compression. I'm not sure what's the ratio of the rar compression,
View 1 RepliesHow can I make a program that stores multiple files in one big file (for transporting). There is no need for compression(takes too long).
also, would it be able to open them in this same program (like a windows explorer folder)?
We need to conditionally disable GZIP compression if user's browser is IE6 (it hangs browser for 5min) in few pages of larger site. Server is IIS7 and has compression for static content turned on - want that compression left working if user agent is not Mozilla/4.0. ASPX code sample anyone? Alternatively, code to conditionally redirect to the same page on another site (could create another virtual site with compression disabled) but need to pass all parameters (GET/POST).
View 1 RepliesI want to check Disk compressed(compress drive to save disk space) property. I have following code to check it. But it always return false. whether it is compress or not.
Dim drive As String = "C"
Dim parameter As String = "win32_logicaldisk.deviceid=""" + drive + ":"""
Dim diskSize As New ManagementObject(parameter)
[Code]....
Private Function Compress(ByVal strInput As String) As Byte()
Try
Dim bytData() As Byte = System.Text.Encoding.UTF8.GetBytes(strInput)
[Code]....
How do i make a program that can compress files, just like programs like winrar do? Every time i try via something as simple as text editor changing something, then changing it back, then it wont work anymore. Any suggestions on how i can make one of these kinds of compression programs?
View 9 RepliesI have a WCF Windows service that provides data to 250+ PDAs via compressed datasets and was looking to redevelop both the service and the mobile application to use Entity Framework 4.x models. In order to keep performance acceptable when sending/receiving data on the PDA I need to keep the data size as small as possible and was wondering if its possible to compress a IEnumerable from the WCF windows service? From previous experience with the datasets I got a 80%+/- compression rate and even decompressing the data on the PDA achieved an overal 50% performance importment so retaining similar levels of performance is critical. Could I use a binary serializer and then compress the stream?
View 1 Repliescan we unzip a zipped folder using microsoft APIs or namespaces perhaps System.IO.Compression. However, it seems to be cumbersome to use them. With a thrid party dll file it works perfectly fine, however i dont want to use it as we dont know what is actually happening inside. Can we have a piece of code which unzips a zipped folder.
View 3 RepliesI'm returning a database query into a List object and using that list object to fill the X and Y axes of my chart as seen below. (_runData is a "List(of DatabaseTableName)" style Object filled with the results of my query.
Primary_Chart.Series(0).Points.DataBindXY(_runData, "DateTime", _runData, "UPPER_PRESSURE")
My Datetime field is returning as a Serial Number (i.e. 40116.76111) so I want to format the X Axis to display the field more readably. Enter my problem code.
[code].....
Im looking for a class or code in VB.NET that can convert a black and white image in JPEG format to a grayscale TIFF format.
View 2 RepliesI'm creating a VB app that uses the Infragistics UltraGrid to display data from 2 JD Edwards files. Before the data is displayed, first I need to convert 2 date fields that are in JD Edwards Julian date format (i.e., 111158 for 6/07/11....the 158th day of this year) to mmddyy format.
MCTS: Web Apps, MCTS: Windows Apps, MCTS: SQL Server 2005, MCP: Windows XP Professional, A+, Network+, Linux+, Security+, Master CIW Designer, SCJP
I am using VS 2005 pro and VB.NET. How do you format the DataGridView.DefaultCellStyle.format property for zip codes and phone numbers. I have a zip code and phone number column(s) that I want to be formatted. I have tried a lot of different things:
Zip code: "99999-0000" or "Phone Number: "(999)000-0000" or "(000)000-0000" and the like So far nothing has worked. I can get my date columns formatted correctly, but not these. Can any one give me some examples that work?
I need to take a string formatted like '010711' (DDMMYY) and put it into format '01-Jul-11'. Ive thought about doing something like string.toArray and then having some conditionals that format from there but am looking for an easier way.
View 5 RepliesWhen retrieving rows from an SQL Server table I use the following code select mydate, Customer, Details from sales where mydatetime >= '" & format (somedate, "MMM d, yyyy h:mm:ss tt") & "'"This works fine unless the clients computers windows Region setting is 'English (New Zealand)'The default time format in windows Region and Language for New Zealand is [code]On computers with this region setting I get an SQL Error 'Conversion failed when converting date and/or time from character string'..If I manually select the other option for AM symbol, PM symbol in Region and Language i.e AM PM the all works fine again..What format string can I use so that above code always works, even if the Region time format is a.m. / p.m.
View 1 Repliesformat Gridview's unbound column in 12hr format? i tried the following code, it didnt work.
[Code]...
I have a DGV that is getting data from a sql db. The dates in this db are stored as doubles ie 40025.708681
How do I format this column as Date/Time?
I tried but this doesn't seem to work.
how to do this? DGV1.Columns("HostDate").DefaultCellStyle.Format = "d"
The bottom line on a dropped-down datetimepicker shows the date different then in the text-part.In my case, the text-part format was yyyy/mm/dd, but the bottom part of the dropped down part stated Today: dd/mm/yyyy, what is probably the format set in the regional settings.
View 5 Repliesi just started usign Vb two days ago, as it was required for work and i just wondered how to change the format of the total into a money format
View 3 RepliesHow to convert jpg format into binary format using VB code ?
View 3 RepliesI want to format the Timespan to have format like this 49 hr 34 mn 20 sec
I used the String format below :
String.Format("{0:00}:{1:00}:{2:00}", theTimeSpan.TotalHours, theTimeSpan.Minutes, theTimeSpan.Seconds)
It formats the Timespan to this format 49:34:20. How can I add hr mn sec to the String.Format above? or there's another easy way?
How would I format txtLabel.Text to a currency format?
The text would be 15000000
I would like the text to show $15,000,000
How to format drive in FAT 16 format using VB.NET without user interaction?
View 1 Replies