Simple C# 7-zip library? | Tech Off

alwaysmc2
It's not stupid; It's advanced!

I've looked all over and haven't found an easy-to-use C# library that allows the decompression of 7-zip archives. I want to be able to enumerate the contents of a 7-zip archive and extract single files from it. I don't even care about the library's code, and would actually prefer a DLL.

Anyone know if what I am describing exists?

littleguru
<3 Seattle

Isn't 7-zip open source? You could look into how they did it and try to rebuild (only for personal usage of course).

alwaysmc2
It's not stupid; It's advanced!

In reply to littleguru

#Aug 2nd, 2008 @ 7:51 PM

Sadly, "open source" doesn't imply "easy to reuse". :-/

Found this in the FAQ earlier:

How can I add support for 7z archives to my application?

One way is to use the 7za.dll (available from sf.net for download). The 7za.dll works via COM interfaces. It, however, doesn't use standard COM interfaces for creating objects. You can find a small example in the source code. A full example is 7-Zip itself, since 7-Zip works via this dll also. There are other applications that use 7za.dll such as WinRAR, PowerArchiver and others.

The other way is to call the command line version: 7za.exe.

littleguru
<3 Seattle

In reply to alwaysmc2

#Aug 2nd, 2008 @ 8:17 PM

Have you tried the SDK that you can download from the 7zip website. It has also samples for C#.

alwaysmc2
It's not stupid; It's advanced!

In reply to littleguru

#Aug 3rd, 2008 @ 11:57 AM

I have. The purpose of the SDK is to compress/decompress data using the LZMA, however it does not include the extra bit of code to apply that algorythm to 7-zip files. Sad

I also found this C# interface for the the 7-zip dll, but haven't had success with it.

Maddus Mattus
Do, or do not. There is no try. - Yoda

In reply to alwaysmc2

#Aug 3rd, 2008 @ 12:37 PM

http://sharpdevelop.net/OpenSource/SharpZipLib/

littleguru
<3 Seattle

In reply to Maddus Mattus

#Aug 4th, 2008 @ 1:53 AM

That's not 7zip... so i guess it's not what alwaysmc2 wants.

alwaysmc2
It's not stupid; It's advanced!

In reply to littleguru

#Aug 4th, 2008 @ 5:35 PM

I tried it anyway, and it is exactly what I want, except that it doesn't support 7-zip. The way the library manages adding and extracting files is very simple, but still flexible.

littleguru
<3 Seattle

In reply to alwaysmc2

#Aug 4th, 2008 @ 7:18 PM

You were just in a search for a ZIP library? That comes already with .NET 3.5 build-in btw. I thought you wanted something that is 7-zip specific.

Maddus Mattus
Do, or do not. There is no try. - Yoda

In reply to littleguru

#Aug 4th, 2008 @ 10:15 PM

I like the ziplib better then the built in zip capabilities. But that's just me.

And yes I knew it didnt support 7-Zip, but I was in a bit of a hurry so I thought I would just dump the link and let him decide for himself if it was usefull or not Smiley

alwaysmc2
It's not stupid; It's advanced!

In reply to Maddus Mattus

#Aug 5th, 2008 @ 12:06 AM

Yeah, I do want 7-zip support, but it seems that SharpZipLib is a great example of how a compression library should be implimented.

markhor

In reply to alwaysmc2

#Aug 5th, 2008 @ 4:34 AM

You may try a new project SevenZipSharp (written by me).

W3bbo
The Master of Baiters

In reply to markhor

#Feb 22nd @ 4:12 PM

Oh, damnit, I hate you.

I spent the past few weeks wrestling with putting together my own LZMA-based compression library by using SharpZipLib's Tarballs and then running it through 7Zip's LzmaAlone library.

....but then I notice your library hooks into the COM interfaces in the 7zip library rather than implementing the 7zip format entirely in managed code. That's the killer for me. I'm looking for a totally managed solution.

(I'd like to mention that the C# LzmaAlone builds outperform the C++ version by about 2 seconds when compressing 60MB)

markhor

In reply to W3bbo

#Feb 22nd @ 4:38 PM

Emm, sorry Smiley

You see, if you make a totally managed implementation, it will be as hard as for Igor Pavlov, and he said on SourceForge, he couldn't even imagine a C# 7-zip. We could collaborate and make it, i guess, but what about other formats embedded in 7-zip, such as zip, cab, rar, deb, etc.? It is too much to do, nobody will work on it for free.

W3bbo
The Master of Baiters

In reply to markhor

#Feb 24th @ 3:18 PM

Go for the core userbase: developers wanting the best compression they can get. They'll be wanting 7zip with LZMA, nothing else.

Depending on how things go with my project, I may look into helping you out.

7Zip#

In reply to W3bbo

#Feb 24th @ 3:19 PM

Hi,

I am looking for some one who can help me in converting 7Zip to C#. I have ported all the code from j7zip(java port of 7Zip) to C#. It successfully compiled but i am getting some runtime errors. Kindly help me in fixing those errors.I will send you the code if you are interested to work with me.

Thanks
7zip#

W3bbo
The Master of Baiters

In reply to 7Zip#

#Mar 18th @ 1:11 AM

You'd be better off asking your questions on the official 7Zip forums, I don't have the free time I thought I'd have to work on porting 7Zip over. As I mentioned earlier, my ersatz Tarball-LZMA approach works for me right now.

Any runtime errors would deal with the implementation of the algorithm and system, more than just simple porting issues, and that's going to be very difficult to investigate since you need to maintain 100% compatibility with the 7Zip format and LZMA algorithm.