Zip Expert 1 0 – Extract Create Archive Files

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If the above steps do not work, create a new user account and check if you can extract the compressed files without any issue. Follow these steps to create a new user account: 1. To open User Accounts, click the Start button, click Control Panel, click User Accounts and Family Safety, and then click User Accounts. Click Manage another account. Open and extract zip, rar, 7z, and other archive files. WinArchiver can unzip all popular archives. Create zip, 7z, iso, and mzp files from hard disk files. Edit existing archive files. Mount zip, rar, and other files to virtual drives without extraction. You can use WinArchiver as a professional virtual drive software.

The ZIP archives are used to compress and keep one or more files or folders into a single container. A ZIP archive encapsulates the files and folders as well as holds their metadata information. The most common usage of archiving is reducing the size of the files for storage or transmission and applying encryption for security. Apart from the file compression tools, the automated compression/extraction features are also used within various desktop and web applications for uploading, downloading, sharing, or encrypting the files. This article also targets similar scenarios and presents some easy ways of compressing files or folders and creating ZIP archivesprogrammatically using C#.

In this article, you will learn how to perform the following ZIP archiving operations: Checkbook pro 2 5 11 download free.

• Create a ZIP archive using C#.
• Add multiple files to a ZIP archive.
• Add folders to a ZIP archive.
• Create a password-protected ZIP archive.
• Encrypt ZIP archive with AES encryption.

Prerequisite – C# ZIP Library

Aspose.ZIP for .NET is a powerful and easy to use API for zipping or unzipping files and folders within .NET applications. It also provides AES encryption techniques to encrypt the files in ZIP archives. You can install the API from NuGet or download its binaries from the Downloads section.

Create a ZIP Archive in C#

The following are the steps to compress a file by adding it into a ZIP archive:

• Create a FileStream object for the output ZIP archive.
• Open the source file into a FileStream object.
• Create an object of Archive class.
• Add the file into the archive using Archive.CreateEntry(string, FileStream) method.
• Create the ZIP archive using Archive.Save(FileStream) method.

The following code sample shows how to add a file into a ZIP archive using C#.

Add Multiple Files into ZIP Archive in C#

In case you want to add multiple files into a ZIP archive, you can do it using one of the following ways.

ZIP Multiple Files using FileStream

In this method, the FileStream class is used to add files to the ZIP archive using Archive.CreateEntry(String, FileStream) method. The following code sample shows how to add multiple files into a ZIP in C#.

ZIP Multiple Files using FileInfo

You can also use the FileInfo class for adding multiple files into a ZIP archive. In this method, the files will be loaded using the FileInfo class and added to the ZIP archive using Archive.CreateEntry(String, FileInfo) method. The following code sample shows how to ZIP multiple files using the FileInfo class in C#.

Add Folders to a ZIP Archive in C#

You can ZIP a folder as well which could be another alternative of adding multiple files to a ZIP archive. Just put the source files into a folder and add that folder to the ZIP archive. The following are the steps to ZIP a folder:

• Create an object of FileStream class for the output ZIP archive.
• Create an instance of the Archive class.
• Use the DirectoryInfo class to specify the folder to be zipped.
• Use Archive.CreateEntries(DirectoryInfo) method to add folder into ZIP.
• Create the ZIP archive using Archive.Save(FileStream) method.

The following code sample shows how to add a folder to ZIP in C#.

Create a Password-Protected ZIP Archive in C#

You can protect the ZIP archives using the password. In order to specify a password for the ZIP archive, the ArchiveEntrySettings class is used in the constructor of the Archive. The following code sample shows how to create a password-protected ZIP archive in C#.

Create AES Encrypted ZIP Archives in C#

Aspose.ZIP for .NET also lets you apply AES encryption to the ZIP archives. You can use the following AES encryption methods:

• AES128
• AES192
• AES256

In order to apply AES encryption, API offers the AesEcryptionSettings class. The following code sample shows how to create an AES encrypted ZIP archive in C#.

Learn more about Aspose.ZIP for .NET

Explore more about our C# ZIP API using the following resources:

See also

Archive::Zip::FAQ - Answers to a few frequently asked questions about Archive::Zip

It seems that I keep answering the same questions over and over again. I assume that this is because my documentation is deficient, rather than that people don't read the documentation.

So this FAQ is an attempt to cut down on the number of personal answers I have to give. At least I can now say 'You did read the FAQ, right?'.

The questions are not in any particular order. The answers assume the current version of Archive::Zip; some of the answers depend on newly added/fixed functionality.

Q: Archive::Zip won't install on my RedHat 9 system! It's broke!

A: This has become something of a FAQ. Basically, RedHat broke some versions of Perl by setting LANG to UTF8. They apparently have a fixed version out as an update.

You might try running CPAN or creating your Makefile after exporting the LANG environment variable as

LANG=C

Q: My zip file is actually bigger than what I stored in it! Why?

Zip Expert 1 0 – Extract Create Archive Files Pdf

A: Some things to make sure of:

$member->desiredCompressionMethod( COMPRESSION_DEFLATED );

Since zip computes the compression tables for each member, small members without much entropy won't compress well. Instead, if you've got lots of repeated strings in your data, try to combine them into one big member.

Zip Expert 1 0 – Extract Create Archive Files Free

If you're storing a .zip, .jpg, .mp3, or other compressed file in a zip, then don't compress them again. They'll get bigger.

Q: Can you send me code to do (whatever)?

A: Have you looked in the examples/ directory yet? It contains:

examples/calcSizes.pl -- How to find out how big a Zip file will be before writing it

examples/copy.pl -- Copies one Zip file to another

examples/extract.pl -- extract file(s) from a Zip

examples/mailZip.pl -- make and mail a zip file

examples/mfh.pl -- demo for use of MockFileHandle

examples/readScalar.pl -- shows how to use IO::Scalar as the source of a Zip read

examples/selfex.pl -- a brief example of a self-extracting Zip

examples/unzipAll.pl -- uses Archive::Zip::Tree to unzip an entire Zip

examples/updateZip.pl -- shows how to read/modify/write a Zip

examples/updateTree.pl -- shows how to update a Zip in place

examples/writeScalar.pl -- shows how to use IO::Scalar as the destination of a Zip write

examples/writeScalar2.pl -- shows how to use IO::String as the destination of a Zip write

examples/zip.pl -- Constructs a Zip file

examples/zipcheck.pl -- One way to check a Zip file for validity

examples/zipinfo.pl -- Prints out information about a Zip archive file

examples/zipGrep.pl -- Searches for text in Zip files

examples/ziptest.pl -- Lists a Zip file and checks member CRCs

examples/ziprecent.pl -- Puts recent files into a zipfile

examples/ziptest.pl -- Another way to check a Zip file for validity

Q: Why can't I open a Zip file, add a member, and write it back? I get an error message when I try.

A: Because Archive::Zip doesn't (and can't, generally) read file contents into memory, the original Zip file is required to stay around until the writing of the new file is completed.

The best way to do this is to write the Zip to a temporary file and then rename the temporary file to have the old name (possibly after deleting the old one).

Archive::Zip v1.02 added the archive methods overwrite() and overwriteAs() to do this simply and carefully.

See examples/updateZip.pl for an example of this technique.

Q: Upon extracting files, I see that their modification (and access) times are set to the time in the Zip archive. However, their creation time is not set to the same time. Why?

A: Mostly because Perl doesn't give cross-platform access to creation time. Indeed, many systems (like Unix) don't support such a concept. However, if yours does, you can easily set it. Get the modification time from the member using lastModTime().

Q: Can I use Archive::Zip to extract Unix gzip files?

A: No.

There is a distinction between Unix gzip files, and Zip archives that also can use the gzip compression.

Depending on the format of the gzip file, you can use Compress::Raw::Zlib, or Archive::Tar to decompress it (and de-archive it in the case of Tar files).

You can unzip PKZIP/WinZip/etc/ archives using Archive::Zip (that's what it's for) as long as any compressed members are compressed using Deflate compression.

Q: How can I add a directory (or tree) full of files to a Zip?

A: You can use the Archive::Zip::addTree*() methods:

Q: How can I extract some (or all) files from a Zip into a different directory?

A: You can use the Archive::Zip::extractTree() method: ??? ||

Q: How can I update a Zip from a directory tree, adding or replacing only the newer files?

A: You can use the Archive::Zip::updateTree() method that was added in version 1.09.

Q: It bothers me greatly that my file times are wrong by one second about half the time. Why don't you do something about it?

A: Get over it. This is a result of the Zip format storing times in DOS format, which has a resolution of only two seconds.

Q: My file times don't respect time zones. What gives?

A: If this is important to you, please submit patches to read the various Extra Fields that encode times with time zones. I'm just using the DOS Date/Time, which doesn't have a time zone.

Q: I want to make a self-extracting Zip file. Can I do this?

A: Yes. You can write a self-extracting archive stub (that is, a version of unzip) to the output filehandle that you pass to writeToFileHandle(). See examples/selfex.pl for how to write a self-extracting archive.

However, you should understand that this will only work on one kind of platform (the one for which the stub was compiled).

Q: How can I tell if a Zip has been damaged by adding garbage to the beginning or inside the file?

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A: I added code for this for the Amavis virus scanner. You can query archives for their 'eocdOffset' property, which should be 0:

When members are extracted, this offset will be used to adjust the start of the member if necessary.

Q: I'm trying to extract a file out of a Zip produced by PKZIP, and keep getting this error message:

A: You can't uncompress this archive member. Archive::Zip only supports uncompressed members, and compressed members that are compressed using the compression supported by Compress::Raw::Zlib. That means only Deflated and Stored members.

Your file is compressed using the Shrink format, which is not supported by Compress::Raw::Zlib.

You could, perhaps, use a command-line UnZip program (like the Info-Zip one) to extract this.

Q: How do I decrypt encrypted Zip members?

A: With some other program or library. Archive::Zip doesn't support decryption, and probably never will (unless you write it).

Q: How can Archive::Zip can test the validity of a Zip file?

A: If you try to decompress the file, the gzip streams will report errors if you have garbage. Most of the time.

If you try to open the file and a central directory structure can't be found, an error will be reported.

When a file is being read, if we can't find a proper PK. signature in the right places we report a format error.

If there is added garbage at the beginning of a Zip file (as inserted by some viruses), you can find out about it, but Archive::Zip will ignore it, and you can still use the archive. When it gets written back out the added stuff will be gone.

There are two ready-to-use utilities in the examples directory that can be used to test file integrity, or that you can use as examples for your own code:

Zip Expert 1 0 – Extract Create Archive Files File

examples/zipcheck.pl shows how to use an attempted extraction to test a file.

examples/ziptest.pl shows how to test CRCs in a file.

Q: Archive::Zip let me put the same file in my Zip twice! Why don't you prevent this?

A: As far as I can tell, this is not disallowed by the Zip spec. If you think it's a bad idea, check for it yourself:

I can even imagine cases where this might be useful (for instance, multiple versions of files).

Q: Why doesn't Archive::Zip deal with file ownership, ACLs, etc.?

A: There is no standard way to represent these in the Zip file format. If you want to send me code to properly handle the various extra fields that have been used to represent these through the years, I'll look at it.

Q: I've only installed modules using ActiveState's PPM program and repository. But they have a much older version of Archive::Zip than is in CPAN. Will you send me a newer PPM?

A: Probably not, unless I get lots of extra time. But there's no reason you can't install the version from CPAN. Archive::Zip is pure Perl, so all you need is NMAKE, which you can get for free from Microsoft (see the FAQ in the ActiveState documentation for details on how to install CPAN modules).

Q: How come my JPEGs and MP3's don't compress much when I put them into Zips?

A: Because they're already compressed.

Q: I'm using Windows. When I try to use Archive::Zip, my machine locks up/makes funny sounds/displays a BSOD/corrupts data. How can I fix this?

A: First, try the newest version of Compress::Raw::Zlib. I know of Windows-related problems prior to v1.14 of that library.

Q: I want to read a Zip file from (or write one to) a scalar variable instead of a file. How can I do this?

A: Use IO::String and the readFromFileHandle() and writeToFileHandle() methods. See examples/readScalar.pl and examples/writeScalar.pl.

Q: How do I read from a stream (like for the Info-Zip funzip program)?

A: This is not currently supported, though writing to a stream is.

To install Archive::Zip::FAQ, copy and paste the appropriate command in to your terminal.

For more information on module installation, please visit the detailed CPAN module installation guide.