Extracting zip files

Hello, I'm trying to extract a zip file to a certain path with C#. I have no clue how to do so. I've tried a few tutorials and guides. had a try of solutions on other posts, and nothing works.

Is anybody able to help? Thanks

Kind Regards, Lachlan

UPDATE: I added the System.IO.FileSystem reference and tried

Code (CSharp):

1. System.IO.Compression.ZipFile("zipdir", "todir");

And unity is saying
"error CS0103: The name `ZipFile' does not exist in the current context"

 

When I looked that up on its docs, it said available since .Net 4.5, so that's probably why it doesn't work with Unity currently. What about if you execute a winzip process from inside your game/app?

 

Just curious, but is there a reason you need zip files instead of using asset bundles?

 

If you just want to zip/unzip data you can Unity's built in zip compression (using Unity.IO.Compression and GZipStream).

Alternatively there's various C# libs for zip files you can use - I've had success with ICSharpCode.SharpZipLib.Zip (copy the folders from https://github.com/icsharpcode/SharpZipLib/tree/master/src/ICSharpCode.SharpZipLib to somewhere in your project) before but the API is a bit convoluted. You would use it like this (very roughly):

Code (CSharp):

1.  
2. using UnityEngine;
3. using System;
4. using System.IO;
5. using System.Collections;
6. using ICSharpCode.SharpZipLib.Core;
7. using ICSharpCode.SharpZipLib.Zip;
8.  
9. void LoadZipFile( string FilePath )
10. {
11.    if( System.IO.File.Exists( FilePath ) == false )
12.        return;
13.  
14.    // Read file
15.    FileStream fs = null;
16.    try
17.    {
18.        fs = new FileStream( FilePath , FileMode.Open );
19.    }
20.    catch
21.    {
22.        Debug.Log( "GameData file open exception: " + FilePath );
23.    }
24.  
25.    if( fs != null )
26.    {
27.        try
28.        {
29.            // Read zip file
30.            ZipFile zf = new ZipFile(fs);
31.            int numFiles = 0;
32.          
33.            if( zf.TestArchive( true ) == false )
34.            {
35.                Debug.Log( "Zip file failed integrity check!" );
36.                zf.IsStreamOwner = false;
37.                zf.Close();
38.                fs.Close();
39.            }
40.            else
41.            {
42.                foreach( ZipEntry zipEntry in zf )
43.                {
44.                    // Ignore directories
45.                    if( !zipEntry.IsFile )
46.                        continue;        
47.                  
48.                    String entryFileName = zipEntry.Name;
49.                  
50.                    // Skip .DS_Store files (these appear on OSX)
51.                    if( entryFileName.Contains( "DS_Store" ) )
52.                        continue;
53.                  
54.                    Debug.Log( "Unpacking zip file entry: " + entryFileName );
55.                  
56.                    byte[] buffer = new byte[ 4096 ];     // 4K is optimum
57.                    Stream zipStream = zf.GetInputStream( zipEntry );
58.  
59.                    // Manipulate the output filename here as desired.
60.                    string fullZipToPath = "c:\\" + Path.GetFileName( entryFileName );
61.  
62.                    // Unzip file in buffered chunks. This is just as fast as unpacking to a buffer the full size
63.                    // of the file, but does not waste memory.
64.                    // The "using" will close the stream even if an exception occurs.
65.                    using (FileStream streamWriter = File.Create(fullZipToPath))
66.                    {
67.                        StreamUtils.Copy(zipStream, streamWriter, buffer);
68.                    }
69.                    numFiles++;
70.                }
71.  
72.                zf.IsStreamOwner = false;
73.                zf.Close();
74.                fs.Close();
75.            }
76.        }
77.        catch
78.        {
79.            Debug.Log( "Zip file error!" );
80.        }
81.    }
82. }
83.  
84.  

 

it is possible to stream (get data) from a zip file

 

@tonemcbride what if my zip file has directories and files both. And inside those directories, there are files.
please help

 

Hey this is easy, but not well known for unity.

Firstly go to your player settings and make sure your targeting .net4.X
Then open notepad and add this line

Code (CSharp):

1. -r:System.IO.Compression.FileSystem.dll

Save it to your root assets folder as "mcs.rsp"

You may have to reload Unity, or create a dummy CS file to force VS to recompile the assemly.

 

Just an extra note, you can do this for any .net dll that Unity doesn't target by default. For example, this is what I am targeting in my current project.

Code (CSharp):

1. -r:System.Net.Http.dll
2. -r:System.Drawing.dll
3. -r:System.IO.Compression.FileSystem.dll

 

Hi @deadlyGolum , it's not something I've done before but it should be fairly straightforward. In this code here: https://howtodoinjava.com/java/io/unzip-file-with-subdirectories/ you can see a java example of how it works.

In my code it checks for 'zipEntry.IsFile' and if it isn't a file it gets skipped. You could change that to check for a directory and create the directory if it finds one.

 

• when targeting the .NET 3.5 Equivalent (deprecated) scripting runtime version,

  mcs

  is used with

  mcs.rsp

  , and

• when targeting the .NET 4.x Eqivalent scripting runtime version compiler,

  csc

  is used with

  csc.rsp

  .

Open notepad and add this line

Code (CSharp):

1. -r:System.IO.Compression.dll
2. -r:System.IO.Compression.FileSystem.dll

Save it to your root assets folder as mcs.rsp/csc.rsp depending on .NET version
Reload Unity and Editor, just in case)

 

did not work for me

 

Loading assembly failed: "Assets/Plugins/System.IO.Compression.dll"

And it still seems to work, at least in the editor.