[ { "Id": "254740", "ThreadId": "74466", "Html": "

Hi all,

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Im trying to zip a directory into a zip file.

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The output zip file's size doesn't change, although Im

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changing the CompressionLevel from 0 to 9.

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Here is the relevant code:(VB.Net 2005)

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----------------------------------------------------------------------------

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Using zip As New ZipFile()
            zip.StatusMessageTextWriter = System.Console.Out
            zip.AddDirectory("C:\\Temp\\")
            zip.CompressionLevel = Ionic.Zlib.CompressionLevel.Level1
            zip.UseZip64WhenSaving = Ionic.Zip.Zip64Option.Never
            zip.Save("C:\\1.zip")

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End Using

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----------------------------------------------------------------------------

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Does anyone know what am I missing here?

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Thanks anayway.

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Ofer

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", "PostedDate": "2009-11-08T07:29:37.863-08:00", "UserRole": null, "MarkedAsAnswerDate": null }, { "Id": "254745", "ThreadId": "74466", "Html": "

yes.

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from the doc:

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As with some other properties on the ZipFile class, like Password, Encryption, and ZipErrorAction, setting this property on a ZipFile instance will cause the specified CompressionLevel to be used on all ZipEntry items that are subsequently added to the ZipFile instance. If you set this property after you have added items to the ZipFile, but before you have called Save(), those items will not use the specified compression level.

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Try this:

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Using zip As New ZipFile()\r\n            zip.StatusMessageTextWriter = System.Console.Out\r\n            zip.CompressionLevel = Ionic.Zlib.CompressionLevel.Level1\r\n            zip.UseZip64WhenSaving = Ionic.Zip.Zip64Option.Never\r\n            zip.AddDirectory("C:\\Temp\\")\r\n            zip.Save("C:\\1.zip")\r\nEnd Using\r\n\r\n
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", "PostedDate": "2009-11-08T07:59:22.027-08:00", "UserRole": null, "MarkedAsAnswerDate": null }, { "Id": "254905", "ThreadId": "74466", "Html": "

Hi Cheeso,

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I'd tryed it, but it doesn't change the compression or file size.

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My problem remains the same.

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Thanks

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", "PostedDate": "2009-11-08T22:03:19.84-08:00", "UserRole": null, "MarkedAsAnswerDate": null }, { "Id": "254907", "ThreadId": "74466", "Html": "

What are you compressing, exactly?  If it's previously compressed, it won't compress any further.

", "PostedDate": "2009-11-08T22:05:32.313-08:00", "UserRole": null, "MarkedAsAnswerDate": null }, { "Id": "254914", "ThreadId": "74466", "Html": "

Today we are using WinZip for each directory

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we want to zip inorder to send it to our customers.

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We wanted to develop a .net app so we wont have to

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zip it with WinZip for each customer.

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The dir contains a few jpg's & Tifs.

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The customer has an old program that uses cmd to unzip the file:

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UNZIP -s -o NewZipFile.Zip -d C:\\Temp

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We see different sizes between the old winZip file and the new zip file.

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Also we see different outputs when the customer runs the commandline:

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The old file (using WinZip) - the output writes: Inflating......

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The new file (using Ionic) - the output writes: Extracting.......

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I read that the difference is because the new file is not compressed,

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so thats why I want to know how to make the compressionlevel to work.

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Hope I'm more clear now,

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Ofer

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", "PostedDate": "2009-11-08T22:36:47.75-08:00", "UserRole": null, "MarkedAsAnswerDate": null }, { "Id": "254936", "ThreadId": "74466", "Html": "

Yes, more clear, thanks.

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Here's an idea: In the older version of the library, there was a heuristic that always applied a CompressionLevel.None for some document types.  I think that included .jpg files.

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What version of the library are you using?  Have you tried v1.9? 

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", "PostedDate": "2009-11-09T00:07:15.923-08:00", "UserRole": null, "MarkedAsAnswerDate": null }, { "Id": "254942", "ThreadId": "74466", "Html": "

It wokrs!!!!

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Thank you very much Cheeso.

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I was using v 1.8. The problem was solved after updrading to v1.9.

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You were right about changing the compression level before

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adding the the directory. I tryed to change the order and it doesn't work.

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The following code Works great:

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zip.CompressionLevel = Ionic.Zlib.CompressionLevel.Level1
zip.UseZip64WhenSaving = Ionic.Zip.Zip64Option.Never
zip.AddDirectory("C:\\Temp\\")
zip.Save("C:\\1.zip")

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Thank again!!!!!

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(-',

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", "PostedDate": "2009-11-09T00:50:11.017-08:00", "UserRole": null, "MarkedAsAnswerDate": null }, { "Id": "254972", "ThreadId": "74466", "Html": "

Great!  Glad it works for you.

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Good luck to you.

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ps: do me a favor, if you can.  Rate the release at this link:

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http://dotnetzip.codeplex.com/Release/ProjectReleases.aspx?ReleaseId=27890

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(Scroll down to the bottom of the page to see the ratings button)

", "PostedDate": "2009-11-09T02:12:03.52-08:00", "UserRole": null, "MarkedAsAnswerDate": null } ]