CodeProject: C++ wrapper for Gilles Vollant's Unzip API. Free source code and programming help

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21 votes for this article.

Popularity: 6.03 Rating: 4.56 out of 5

Sample Image - unzip.jpg

Introduction

I've been trawling the web for ages trying to find some zip extraction code which

I could understand and
did not have excessive restrictions.

Then I stumbled across Gilles Vollant's excellent work on providing a multi-file API to the ZLib code base written by Jean-loup Gailly and Mark Adler.

That was yesterday. A day later I had wrapped Gilles' code in a simplified C++ wrapper with extended features.

I don't want to gush too much, but having spent the last six months looking for code such as his, I was very impressed by how simply I could understand it and work with it.

The features I've added include:

Navigating/extracting the embedded files/folders by index
Navigating/extracting the embedded files by file extension
Extracting the embedded files whilst ignoring the path info stored with each file. i.e., flattening the file structure

The purpose of this release is mostly to assist people like me who were looking for some code to start with. If I come up with any useful extensions then I will update the code, but feel free (as I know you will) to criticize the code in anyway you like.

p.s. The sample app which comes with the code will show how to use it.

p.s to p.s. Although the sample app is MFC, the wrapper class is pure Win32.

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

About the Author

.dan.g.

Member

.dan.g. is a former chartered structural engineer from the uk. He's been programming since university and has been developing commercial windows software in Australia since 1998.

For all his latest freeware visit http://www.abstractspoon.com/

Occupation:	Software Developer (Senior)
Location:	Australia

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Msgs 1 to 25 of 42 (Total in Forum: 42) (Refresh)

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Only Console mode

msadik

4:57 24 Jun '05

Hi all, How can i use these sample with no graphics, in a project Console (vc++.net) Best regards
Sign In·View Thread·PermaLink	1.00/5 (1 vote)

file name directory

sir kaber

20:18 5 Mar '05

hey, suppose i open a name.zip file. the code, makes a starting off folder called Name Name\FileExtraction.txt, etc.. Is there a way so that Name isn't created ?
Sign In·View Thread·PermaLink	5.00/5 (1 vote)

Re: file name directory

sir kaber

20:19 5 Mar '05

and the zip extraction occurs right there, no mother folder directory created.. but folder recursion occurs.. many thanks in advance.
Sign In·View Thread·PermaLink	2.00/5 (1 vote)

Re: file name directory

rajalist

20:49 7 Dec '06

I got a same problem like this. So I want to know solution Please...someone tell me about this... Anybody doesn't know about this problem????? thanks a lot
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Why win32?

tentons

14:25 27 Aug '04

A major strength of zlib is platform independence, so why make a win32 specific wrapper when it's so easy to make it more generic (and therefore useful to more people)? I'm doing cross-development, so this won't help me. Big disappointment. tentons
Sign In·View Thread·PermaLink	4.00/5 (2 votes)

Is this thing still alive ?

Anonymous

19:07 6 Jul '04

Is this project still alive ? Are there any updates being done ? When was the last release (less then 12 months I hope !) ? Are there bugs reported since the last release ? Have the reported bugs been fixed yet ? Basicaly, is this thing dead ?
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Can you help me?

Alick Xiong

22:42 17 Jun '04

Excuse me ,Sir If I got a zip file with only many htmls compressed.How can I open a HTML file in the file list in my HtmlView? not launch IE! Thank you sir. Alick
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eVC++?

Hameed Chishti

1:48 15 May '04

How to use it with eVC? What do i need to change? Plz help i'm in great trouble
Sign In·View Thread·PermaLink	1.00/5 (2 votes)

Folder attributs are forget too !!

bebert

5:07 2 Dec '03

this part must include the SetFileAttributesA function too!!!!! // if the item is a folder then create it and return 'TRUE' if (info.bFolder) { char szFolderPath[MAX_PATH]; _makepath(szFolderPath, NULL, szFolder, info.szFileName, NULL); bool result = CreateFolder(szFolderPath); if(result) ::SetFileAttributesA( szFolderPath,info.dwExternalAttrib); return result; }
Sign In·View Thread·PermaLink	1.00/5 (1 vote)

Where are file and folder attributs ??

bebert

23:44 28 Sep '03

you don't restore it !!
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Re: Where are file and folder attributs ??

dang!

16:15 29 Sep '03

can you try the latest code on AbstractSpoon. it contains fixes not yet available here. regards dang! AbstractSpoon (subscribe)
Sign In·View Thread·PermaLink	1.00/5 (1 vote)

You got a 5 from me

Tom Welch

4:52 9 Sep '03

I spent the past two days looking for Unzip DLLs and libraries and after finding this article I had the unzip portion of my application done in 10 minutes. THANK YOU! For those who wonder why I didn't come to CP sooner, frankly I'd have to admit that the CP search is lousy. Perhaps I am spoiled by Google.
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Re: You got a 5 from me

Ravi Bhavnani

11:46 27 Sep '03

Tom Welch wrote: For those who wonder why I didn't come to CP sooner, frankly I'd have to admit that the CP search is lousy. The CP search (which also imho has left something to be desired) seems to have been recently improved. /ravi Let's put "civil" back in "civilization" Home \| Articles \| Freeware \| Music ravib@ravib.com
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Re: You got a 5 from me

dang!

15:06 28 Sep '03

thanks bro, ps. the source code on AbstractSpoon is more up to date and specifically has fixes relating to appending to existing zip files. regards dang! AbstractSpoon (subscribe)
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Re: You got a 5 from me

Iramon

21:52 21 Dec '03

I can just say the same. I didn't realy have to take a look at your sample how to use it and used it just intuitively. 4 simple lines of Code and all the work is done. Perfectly for my purpose!

In german grades you get 15 points Smile

I also downloaded your Zipper-Class, but theres no need to use it yet. I will watch it later on.

If programming is ever that simple, we wouldn't need programmers anymore Wink

thx a lot!

Re: You got a 5 from me

.dan.g.

19:24 22 Dec '03

thanks for the compliments iramon, it's possible though that you do not have the latest code since once the articles get edited it's a pain to update the code. however, if you grab this code you should have the latest .dan.g. AbstractSpoon (subscribe)
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How to incorporate Gilles Vollant's code to for a DLL

gumber

3:26 26 Aug '03

Sir,
I am trying to collect ZLib.lib and all the source files of the Gilles Vollant's code to form "Regular DLL using shared MFC DLL".
For that I have included #include "StdAfx.h" directive in all ".c" files.
But on compilation I get the following error, one for each ".c" file-

"fatal error C1853: 'Debug/filename.pch' is not a precompiled header file created with this compiler"

Kindly help me out of this problem. I'll be really grateful to you.

Regards
Gaurav
Confused

Gaurav Gumber

1.50/5 (2 votes)

Re: How to incorporate Gilles Vollant's code to for a DLL

dang!

18:16 27 Aug '03

sorry for the delay, gaurav

usually this means you need to perform a 'rebuild all'.

however since typically .c files do not use precompiled headers, the best thing to do is to remove the 'stdafx.h' from the .c files and in 'project -> settings -> c/c++ -> precompiled headers' mark all the .c files as not using precompiled headers.

let me know how it goes.

regards

dang!

AbstractSpoon (subscribe)

Re: How to incorporate Gilles Vollant's code to for a DLL

gumber

22:55 29 Aug '03

Hello Sir,

Thanks for being so generous and replying back to my query. I tried all the options told by you.
I started a new Dll project and selected "Regular DLL using shared MFC DLL". I then included all the .c and .h files of Gilles Vollant's code and marked all .c files as not using precompiled headers. And I also gave the path of ZLib library in project->settings->link->Library for all configurations.
The project got compiled successfully.

I then included the dll file that I got in the zip application that I am building. On selecting rebuild all I got the following error:

Fatal error - LNK1136:invalid or corrupt file

However the application runs successfully if in place I give the path of ZLIbStat.lib library built by you.
Kindly help me out.

Regards
Gaurav

Gaurav Gumber

3.50/5 (2 votes)

Buffering?

Anonymous

13:07 23 May '03

Hello, do you guys know how MiniZip does it's job internally? When compressing, does it buffer uncompressed data in memory until certain size is reached, then compress and write? How often does it do it? when uncompressing, does it read the whole File inside the zip at once, then let the client ask for X number of bytes at a time? Thanks, Julio
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Re: Buffering?

DanG

16:12 26 May '03

sorry, i was only interested in wrapping it. however, try contacting giles directly (his email address is in the article) as he was helpful when i contacted him. regards DanG
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Switching to C

darkchrono

16:43 22 Apr '03

I'm trying to convert the wrapper to straight C. Or at least get whats needed so that I can use this in my project. What files do I need to get rid of all the MFC stuff? I managled it up to where I could give it file paths to unzip. But I'm working with Win32 and straight C.
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Re: Switching to C

DanG

17:00 22 Apr '03

the wrapper class (CUnzipper) is pure win32 c++ (ie no MFC). the inclusion of `stdafx.h` (which is a MFC thing) is purely to allow for the use of `LPCTSTR, BOOL` and such like. if you remove `stdafx.h` then you will need to either replace it with a reference to `windows.h` (i think) or simply replace `LPCTSTR` with `const char*` and `BOOL` with `bool`, etc. regards DanG
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