How do I ZIP a file in C using no 3rd-party APIs

Question

I m pretty sure this is not a duplicate so bear with me for just a minute   How can I programatically  C   ZIP a file  in Windows  without using any third party libraries  I need a native windows call or something like that  I really dislike the idea of starting a process  but I will if I absolutely have to  A PInovke call would be much better   Failing that  let me tell you what I m really trying to accomplish  I need the ability to let a user download a collection of documents in a single request  Any ideas on how to accomplish this

User · Answer

private static string CompressFile string sourceFileName                using  ZipArchive archive   ZipFile Open Path ChangeExtension sourceFileName    zip    ZipArchiveMode Create                         archive CreateEntryFromFile sourceFileName  Path GetFileName sourceFileName                      return Path ChangeExtension sourceFileName    zip

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Based off Simon McKenzie s answer to this question  I d suggest using a pair of methods like this       public static void ZipFolder string sourceFolder  string zipFile                if   System IO Directory Exists sourceFolder               throw new ArgumentException  sourceDirectory             byte   zipHeader   new byte     80  75  5  6  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0             using  System IO FileStream fs   System IO File Create zipFile                         fs Write zipHeader  0  zipHeader Length                      dynamic shellApplication   Activator CreateInstance Type GetTypeFromProgID  Shell Application             dynamic source   shellApplication NameSpace sourceFolder           dynamic destination   shellApplication NameSpace zipFile            destination CopyHere source Items    20              public static void UnzipFile string zipFile  string targetFolder                if   System IO Directory Exists targetFolder               System IO Directory CreateDirectory targetFolder            dynamic shellApplication   Activator CreateInstance Type GetTypeFromProgID  Shell Application             dynamic compressedFolderContents   shellApplication NameSpace zipFile  Items          dynamic destinationFolder   shellApplication NameSpace targetFolder            destinationFolder CopyHere compressedFolderContents

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How can I programatically  C   ZIP a file  in Windows  without using   any third party libraries    If using the 4 5  Framework  there is now the ZipArchive and ZipFile classes   using  ZipArchive zip   ZipFile Open  test zip   ZipArchiveMode Create         zip CreateEntryFromFile   c  something txt    data path something txt        You need to add references to    System IO Compression System IO Compression FileSystem   For  NET Core targeting net46  you need to add dependencies for    System IO Compression  System IO Compression ZipFile   Example project json    dependencies        System IO Compression    4 1 0      System IO Compression ZipFile    4 0 1       frameworks        net46          For  NET Core 2 0  just adding a simple using statement is all that is needed    using System IO Compression

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I was in the same situation  wanting to  NET instead of a third party library   As another poster mentioned above  simply using the ZipPackage class  introduced in  NET 3 5  is not quite enough   There is an additional file that MUST be included in the archive in order for the ZipPackage to work   If this file is added  then the resulting ZIP package can be opened directly from Windows Explorer - no problem   All you have to do is add the  Content Types  xml file to the root of the archive with a  Default  node for every file extension you wish to include  Once added  I could browse the package from Windows Explorer or programmatically decompress and read its contents   More information on the  Content Types  xml file can be found here  http   msdn microsoft com en-us magazine cc163372 aspx   Here is a sample of the  Content Types  xml  must be named exactly  file    lt  xml version  1 0  encoding  utf-8    gt   lt Types xmlns       http   schemas openxmlformats org package 2006 content-types  gt     lt Default Extension  xml  ContentType  text xml    gt      lt Default Extension  htm  ContentType  text html    gt      lt Default Extension  html  ContentType  text html    gt      lt Default Extension  rels  ContentType       application vnd openxmlformats-package relationships xml    gt      lt Default Extension  jpg  ContentType  image jpeg    gt      lt Default Extension  png  ContentType  image png    gt      lt Default Extension  css  ContentType  text css    gt    lt  Types gt    And the C  for creating a ZIP file   var zipFilePath    c   myfile zip    var tempFolderPath    c   unzipped         using  Package package   ZipPackage Open zipFilePath  FileMode Open  FileAccess Read                   foreach  PackagePart part in package GetParts                            var target   Path GetFullPath Path Combine tempFolderPath  part Uri OriginalString TrimStart                      var targetDir   target Remove target LastIndexOf                       if   Directory Exists targetDir                    Directory CreateDirectory targetDir                 using  Stream source   part GetStream FileMode Open  FileAccess Read                                   source CopyTo File OpenWrite target                                        Note     This code uses the Stream CopyTo method in  NET 4 0 This will become much simpler with the introduction of the ZipArchive class in  NET 4 5  http   msdn microsoft com en-us library system io compression ziparchive v vs 110  aspx

User · Answer

Are you using  NET 3 5   You could use the ZipPackage class and related classes   Its more than just zipping up a file list because it wants a MIME type for each file you add   It might do what you want   I m currently using these classes for a similar problem to archive several related files into a single file for download   We use a file extension to associate the download file with our desktop app   One small problem we ran into was that its not possible to just use a third-party tool like 7-zip to create the zip files because the client side code can t open it -- ZipPackage adds a hidden file describing the content type of each component file and cannot open a zip file if that content type file is missing

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Add these 4 functions to your project           public const long BUFFER SIZE   4096      public static void AddFileToZip string zipFilename  string fileToAdd                using  Package zip   global  System IO Packaging Package Open zipFilename  FileMode OpenOrCreate                         string destFilename           Path GetFileName fileToAdd               Uri uri   PackUriHelper CreatePartUri new Uri destFilename  UriKind Relative                if  zip PartExists uri                                 zip DeletePart uri                             PackagePart part   zip CreatePart uri      CompressionOption Normal               using  FileStream fileStream   new FileStream fileToAdd  FileMode Open  FileAccess Read                                 using  Stream dest   part GetStream                                          CopyStream fileStream  dest                                                       public static void CopyStream global  System IO FileStream inputStream  global  System IO Stream outputStream                long bufferSize   inputStream Length  lt  BUFFER SIZE   inputStream Length   BUFFER SIZE          byte   buffer   new byte bufferSize           int bytesRead   0          long bytesWritten   0          while   bytesRead   inputStream Read buffer  0  buffer Length      0                        outputStream Write buffer  0  bytesRead               bytesWritten    bytesRead                      public static void RemoveFileFromZip string zipFilename  string fileToRemove                using  Package zip   global  System IO Packaging Package Open zipFilename  FileMode OpenOrCreate                         string destFilename           fileToRemove              Uri uri   PackUriHelper CreatePartUri new Uri destFilename  UriKind Relative                if  zip PartExists uri                                 zip DeletePart uri                                     public static void Remove Content Types FromZip string zipFileName                string contents          using  ZipFile zipFile   new ZipFile File Open zipFileName  FileMode Open                                         ZipEntry startPartEntry   zipFile GetEntry   Content Types  xml                using  StreamReader reader   new StreamReader zipFile GetInputStream startPartEntry                                  contents   reader ReadToEnd                              XElement contentTypes   XElement Parse contents               XNamespace xs   contentTypes GetDefaultNamespace                XElement newDefExt   new XElement xs    Default   new XAttribute  Extension    sab    new XAttribute  ContentType     application binary  modeler Acis  version 18 0 2application binary  modeler Acis  version 18 0 2                 contentTypes Add newDefExt               contentTypes Save   Content Types  xml                zipFile BeginUpdate                zipFile Add   Content Types  xml                zipFile CommitUpdate                File Delete   Content Types  xml                               zipFile BeginUpdate                try                               zipFile Delete   Content Types  xml                    zipFile CommitUpdate                              catch                     And use them like this   foreach  string f in UnitZipList        AddFileToZip zipFile  f       System IO File Delete f     Remove Content Types FromZip zipFile

User · Answer

Looks like Windows might just let you do this     Unfortunately I don t think you re going to get around starting a separate process unless you go to a third party component

[c#] How do I ZIP a file in C#, using no 3rd-party APIs?

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