Regarding Zipped Files

Question

0.00/5 (No votes)

See more:

Hello Everyone,

I am working on some zipped files which I have in my hard disk. I have used the Ionic.Zip to extract all the zip files to my directory in order to read them. But this is taking too long as I suppose File IO takes a hell of a lot of time.

So I tried using Memory mapped files in order to make the process faster so that I can extract the files on the virtual memory, but this didn't work as zip1.ExtractAll(Destination_path); requires a destination path and I cant get one for the memory mapped files.

So I tried reading the zipped files into stream(using Gzip Library) but I keep on getting the error "The magic number in GZip header is not correct. Make sure you are passing in a GZip stream."

My Question is : Is there any way I can reduce the amount of time taken to extract the files on my hard disk or is there any way I dont have to extract and get all the information?Please let me know if someone knows the answer.

Please note my application is windows based.
Thanks

Posted 14-Sep-12 7:22am

GB_1114

Updated 14-Sep-12 7:58am

v3

Add a Solution

Comments

GB_1114 22-Sep-12 18:08pm

Hello Again, i have been using the DotNetZip Library to unzip the files to a destination folder,but the p[process is too slow, can anyone suggest me any faster way to do so. the code I am using is :
using(var zip = Ionic.Zip.ZipFile.Read(Filename))
{
zip.ExtarctAll(DestinationFolderPath);
}
This takes a hell of a lot of time, as I am unzipping around 2200 files Can anyone suggest a faster way to do so. I used memory mapping, but I cant find the path of the memorymappedfile so that I can extract the files over there.

2 solutions

Solution 1

You can try the SharpZipLib library:

http://www.icsharpcode.net/OpenSource/SharpZipLib/Download.aspx[^]

Samples for SharpZipLib:
http://wiki.sharpdevelop.net/SharpZipLib-Zip-Samples.ashx[^]

Posted 14-Sep-12 7:35am

Thomas Daniels

Updated 14-Sep-12 7:36am

v2

Comments

GB_1114 14-Sep-12 13:55pm

Hi Thanks for your reply, I checked some of the codes, but most of them seem to work with ASP.Net, my application is just Windows based, can you suggest something for that?

Sergey Alexandrovich Kryukov 14-Sep-12 16:46pm

No, SharpZipLib has nothing to do with ASP.NET, apparently. You looked at some wrong place, probably some usage samples. I have no idea why they were related to ASP.NET.
--SA

Sergey Alexandrovich Kryukov 14-Sep-12 16:50pm

My 5. Another powerful alternative is 7-zip. Please see my answer.
--SA

GB_1114 14-Sep-12 18:19pm

Thanks a lot Program_Fox and and Sergey for your replies..wil definitely look into this..:))

Sergey Alexandrovich Kryukov 15-Sep-12 20:27pm

You are welcome. Well you formally accept our answers (green button)? -- thanks.
--SA

Espen Harlinn 15-Sep-12 11:53am

5'ed!

GB_1114 22-Sep-12 18:07pm

Hello Again,

i have been using the DotNetZip Library to unzip the files to a destination folder,but the p[process is too slow, can anyone suggest me any faster way to do so.

the code I am using is :

using(var zip = Ionic.Zip.ZipFile.Read(Filename))
{
zip.ExtarctAll(DestinationFolderPath);
}

This takes a hell of a lot of time, as I am unzipping around 2200 files

Can anyone suggest a faster way to do so. I used memory mapping, but I cant find the path of the memorymappedfile so that I can extract the files over there.

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sergey Alexandrovich Kryukov · Accepted Answer · 2012-09-14T10:49:00

Solution 2

In alternative to #ziplib mentioned in Solution 1, you can use SevenZipSharp, a .NET wrapper of the famous 7-Zip:
http://en.wikipedia.org/wiki/7-Zip[^],
http://sevenzipsharp.codeplex.com/[^].

Both ZIP libraries are open-source. (And having nothing to do with ASP.NET :-))

—SA

Posted 14-Sep-12 10:49am

Sergey Alexandrovich Kryukov

Comments

Espen Harlinn 15-Sep-12 11:53am

5'ed!

Sergey Alexandrovich Kryukov 15-Sep-12 20:25pm

Thank you, Espen.
--SA