How can i split to volumes big archive zipped file with 7zip ?

Question

_{Sunday, August 11, 2013 9:10 AM}

In my code i used the 7zip wrapper SevenZipSharp.dll referenced it.

In Form1 in a button click im doing:

Compressions("photofiles.zip", tempphotos, outputphotos);

And this is the Compressions method:

private void Compressions(string zipFile,string sources,string OutPut)
        {
            try
            {
                string zipFileName = zipFile;
                string source = sources;
                string output = OutPut;
                string programFilesX86 = System.Environment.GetFolderPath(System.Environment.SpecialFolder.ProgramFilesX86) + "\\Diagnostic Tool\\7z.dll";
                if (File.Exists(programFilesX86))
                {
                    SevenZipExtractor.SetLibraryPath(programFilesX86);
                }
                else
                {
                    string path = Path.GetDirectoryName(Assembly.GetEntryAssembly().Location) + "\\7z.dll";
                    SevenZipExtractor.SetLibraryPath(path);
                }
                string programFiles = System.Environment.GetFolderPath(System.Environment.SpecialFolder.ProgramFiles) + "\\Diagnostic Tool\\7z.dll";
                if (File.Exists(programFiles))
                {
                    SevenZipExtractor.SetLibraryPath(programFiles);
                }
                else
                {
                    if (File.Exists(programFilesX86))
                    {
                        SevenZipExtractor.SetLibraryPath(programFilesX86);
                    }
                    else
                    {
                        string path = Path.GetDirectoryName(Assembly.GetEntryAssembly().Location) + "\\7z.dll";
                        SevenZipExtractor.SetLibraryPath(path);
                    }
                }
                SevenZipCompressor compressor = new SevenZipCompressor();
                compressor.ArchiveFormat = OutArchiveFormat.Zip;
                compressor.CompressionMode = CompressionMode.Create;
                compressor.TempFolderPath = System.IO.Path.GetTempPath();
                string t = Path.Combine(output, zipFileName);
                
                compressor.CompressDirectory(source, t);
            }
            catch (Exception err)
            {
                Logger.Write("Zip file error: " + err.ToString());
            }
        }

In the end i will have a zip file on my hard disk for example lets say the file is: test.zip and that the file size is 80mb.

Now i want to use the 7zip(SevenZipSharp wrapper) and create/split this zip file to many small files each one 8mb in the same directory.

I googled and tried to look in the 7zip documents i didnt find how to split the big zip file to some smaller zip files.

Any idea how can i do it in my code in c# not with the 7zip.exe or something i need to do it right after it created the big zip file ?

Maybe inside the Compressions method in the end.

All replies (3)

_{Monday, August 12, 2013 7:19 AM ✅Answered}

Hi,

Try to specify the volume of the file:

compressor.VolumeSize = 1024*1000*8;

Or you may try DotNetZip, it's easy to split compressed files by using it. Example code:

int SegmentsCreated ;
using (ZipFile zip = new ZipFile())
{
  zip.UseUnicode= true;  // utf-8
  zip.AddDirectory(@"MyDocuments\ProjectX");
  zip.Comment = "This zip was created at " + System.DateTime.Now.ToString("G") ;
  zip.MaxOutputSegmentSize = 100*1024 ; // 100k segments
  zip.Save("MyFiles.zip");
 
  SegmentsCreated = zip.NumberOfSegmentsForMostRecentSave ;
}


if SegmentsCreated comes back as 5, then you have the following files, each not more than 100kb in size.
•MyFiles.zip
•MyFiles.z01
•MyFiles.z02
•MyFiles.z03
•MyFiles.z04

Caillen
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_{Sunday, August 11, 2013 9:13 AM}

Or maybe in the first place to create instead one big zip file to create 8mb files.

So in the end instead like now i will have 80mb file i will have 10 files each 8mb

_{Monday, August 12, 2013 8:21 AM}

Hi,

 Try some third party library to split zip files. Please refer the below link for more reference,

http://dotnetzip.codeplex.com/wikipage?title=CS-Examples

http://doc.xceedsoft.com/products/XceedFileSystem/topic162.html

http://stackoverflow.com/questions/1583267/c-archiving-a-file-into-parts-of-100mb

http://sevenzipsharp.codeplex.com/

Balaji -Please click mark as answer if my reply solves your problem.