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SAWZip - zip file manipulation control

, 29 Aug 2001
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An ATL based control for reading and writing zip files.


While I was developing my Java Class Browser (JCB) I needed a control or sourcecode (C++) to read jar-files. I searched the web and I didn't find any good freeware to resolve this problem. What I found was the zlib-compression library of Jean-loup Gailly and Mark Adler. It was not easy to figure it out how it worked. After a while I found the library written by Tadeusz Dracz. He uses the zlib-compression in a MFC library. It gave me a good idea on how to use the zlib-compression library. The problem with his library was that it was written with MFC, and I want to avoid using MFC because I JCB is a WTL-program. That's why I started to develop an ATL-control based on the code I found in the sourcecode of Tadeusz Dracz.

You can use this control with Visual C++ and Visual Basic 6.0. The control has been tested on Windows 98 and Windows NT. The UNICODE version of the application is not yet tested on a Windows NT Platform.

Archive Object


Property Type R/W Description
Name String R The name of the zipfile.
Files Files Object R A collection of file-objects.
Comment String R/W The comment for the zipfile.
ReadOnly Boolean R True when the zip you opened is read-only. Test on this flag before you want to compress some files.


Name Returns Parameters Description
Close / / Closes the zipfile.
Create / ByVal aName as String The name of the zipfile to create
Open / ByVal aName as String The name of the zipfile to open

Files Object


Property Type R/W Description
Count long R Number of files in the archive.


Name Returns Parameters Description
Add / ByVal newVal as File Adds a file to the archive. When there's already a file compressed with the same name it will be override this file.
AddFileByName / ByVal aName as String,
ByVal level as Integer,
ByVal fullPath as Boolean,
ByVal refresh as Boolean
This method can add files with wildcards. For level and fullPath see File Object for more information. When refresh is set to true, the file with the same name in the archive is overwritten. When it is set to false, the file will be skipped.

The following example does the following: Adding all C++ sources in the current-directory to the archive. Overwrite the current files in the archive.
zip.Files.AddFileByName "*.cpp", 1, true, true
Item File ByVal index as Long Returns the file on position index.
Remove / ByVal index as Long Removes the file with position index from the archive.

File Object


Property Type R/W Description
Name String R/W The name of the file. When added with fullPath set to false, the path will not be stored in the archive.
Directory Boolean R Returns true when the file is a directory.
CompressedSize Long R The size of the file when compressed.
UncompressedSize Long R The size of the file when not compressed.
Level Integer R/W The level used to perform compression. A value in the range of 0 - 9. 0 is no compression at all. 1 gives best speed, 9 gives best compression. This can only be set when the file is not yet stored in the archive.
Crc32 Long R Returns the crc checkum value.
Comment String R/W Returns or sets the comment. The comment can only be set when the file is not yet in stored in the archive.
FullPath Boolean R/W When stored to the archive and FullPath is false the path-information will be discarded. When the file is extracted and the FullPath is false the file will be extracted without the path-information.
Index Long R The index of this file object in the Files collection. This will be -1 when the file is not yet stored in the archive.


Name Returns Parameters Description
Extract / ByVal aPath as String Extract the file into the specified path. When FullPath is set to false, the file will be stored without the path-information.


This control uses the dll-version of the zlib-compression library. When you install this control the zlib.dll must be reachable. This control makes heavy use of private interfaces to communicate between the different objects. You can read more about this on my page of SAWEditListCtrl on how to accomplish this.


Here is a list of resources I used to develop this control:

The MFC Library of Tadeusz Dracz.
The zlib-compression home page.


27-Dec-2000    Version 1.0 Released.

8-Mar-2001    Version 1.1

  1. Add properties to the fileobject to retrieve the dates of the files
  2. Extracting to a stringbuffer

18-Apr-2001    Version 1.2

  1. Solved a bug in AddFileByName.

23-May-2001    Version 1.4

  • Added a new property for testing on readonly zip-files. Now you can extract from a file from readonly-files.
  • Resolved a memory-leak after extracting a file. (Thanks go to Brad Gutilla).

28-Jun-2001    Version 1.6

  • Version 1.6: Bug resolved in the extract-method. When fullpath was true and the directory didn't exist a Can't create file occured. Now the fullpath is created before extracting. (Thanks Nat Dickinson)

30-Aug-2001 Version 2.0

  • Version 2.0: Solved the comment-bug on the archive-object. Compatible for Win95-users. (Thanks to Frederic St-Laurent)


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

Franky Braem
Web Developer
Belgium Belgium
Programmer since 1991 using C/C++/Visual Basic and Java. Playing with wxWindows at home.

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Comments and Discussions

GeneralLatest version Pin
Michael Ouellette19-Jul-09 18:06
memberMichael Ouellette19-Jul-09 18:06 
Generalrequired bugfix ... Pin
peeveen11-Apr-07 4:41
memberpeeveen11-Apr-07 4:41 
GeneralIt is not working Pin
selfay19-Feb-06 22:43
memberselfay19-Feb-06 22:43 
Questionhow to implement ExtractToStream using ASP Pin
bersileus20-Dec-04 20:41
memberbersileus20-Dec-04 20:41 
Generalerror: start of central directory not found Pin
marcbelcourt5-Nov-04 11:28
sussmarcbelcourt5-Nov-04 11:28 
GeneralRe: error: start of central directory not found Pin
Anonymous13-Oct-05 9:34
sussAnonymous13-Oct-05 9:34 
I ran into this problem too. I spent a few hours trying to figure it out, including a google search, which landed me on your post, with no responses.
I finally figured out what was causing my problem. I had been testing code modifications that were changing the file names in the zip file. That was the only change I had been making, the file contents were exactly the same, just the file names (in the zip file) were changed. Specifically, I had made them slightly shorter. This is when I first saw the error.
The problem was that I was using File.OpenWrite(filename) to open the file. This defaults to FileMode.OpenOrCreate, which since my zip file wasn't deleted between tests was opening the zip file and not truncating it. I would write my entries and close it, but since my filenames were a little shorter the contents of my new file didn't quite overwrite the contents of the previous test. As it turns out, zip files are not tolerant of garbage at the end, which also happens to be where they store their directory structure. So, make sure you open your file explicitly with File.Open(str, FileMode.Create, FileAccess.Write, FileShare.Whatever), or just delete it between tests.
Hope this helps save someone a few hours in the future.
QuestionCAB format compression? Pin
dragomir17-Feb-04 23:13
memberdragomir17-Feb-04 23:13 
GeneralNice Component, but ....... Pin
Mr.Prakash21-Jan-04 1:58
memberMr.Prakash21-Jan-04 1:58 
QuestionMulti-volume support? Pin
petand787-Aug-03 7:09
memberpetand787-Aug-03 7:09 
AnswerRe: Multi-volume support? Pin
petand787-Aug-03 7:13
memberpetand787-Aug-03 7:13 
GeneralError in : ZIP.OPEN "\\SERVER\TEST\TEST.ZIP" Pin
Manaophe6-Dec-02 0:05
memberManaophe6-Dec-02 0:05 
Generalbuild bugs on w2k Pin
Scott Cameron19-Sep-02 9:23
sussScott Cameron19-Sep-02 9:23 
GeneralRe: build bugs on w2k Pin
Anonymous20-Sep-02 6:45
sussAnonymous20-Sep-02 6:45 
GeneralRe: build bugs on w2k Pin
Anonymous20-Sep-02 7:16
sussAnonymous20-Sep-02 7:16 
GeneralRe: build bugs on w2k Pin
Anonymous20-Sep-02 7:32
sussAnonymous20-Sep-02 7:32 
GeneralRe: build bugs on w2k Pin
Franky Braem20-Sep-02 10:56
memberFranky Braem20-Sep-02 10:56 
GeneralRe: build bugs on w2k Pin
Anonymous15-Oct-02 5:38
sussAnonymous15-Oct-02 5:38 
GeneralSAWZip 2.6 Pin
Franky Braem14-Sep-02 3:44
memberFranky Braem14-Sep-02 3:44 
GeneralRe: SAWZip 2.6 Pin
Member 735101724-Oct-11 1:45
memberMember 735101724-Oct-11 1:45 
QuestionIs there a way to add whole directory using AddFileByName ? Pin
mchan20-Aug-02 13:37
membermchan20-Aug-02 13:37 
AnswerRe: Is there a way to add whole directory using AddFileByName ? Pin
mchan21-Aug-02 18:37
membermchan21-Aug-02 18:37 
GeneralRe: Is there a way to add whole directory using AddFileByName? /// Relative path Pin
agyklon13-Sep-02 9:54
sussagyklon13-Sep-02 9:54 
GeneralRe: Is there a way to add whole directory using AddFileByName? /// Relative path Pin
Franky Braem14-Sep-02 3:41
memberFranky Braem14-Sep-02 3:41 
GeneralRe: Is there a way to add whole directory using AddFileByName? /// Relative path Pin
Anonymous15-Sep-02 10:48
sussAnonymous15-Sep-02 10:48 
GeneralSawZip Pin
Nick Davison25-Jul-02 4:17
sussNick Davison25-Jul-02 4:17 

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