How to Zip/Unzip files using C#.NET

How to Zip/Unzip files using C#.NET

Following example works only with Visual Studio .NET 2005 Framework 2.0

Namespace

using System.IO.Compression;

using System.IO;

Example data to run ZipFile function:

sourceFile = @"D:\Ritesh\standards.pdf"

destinationFile = @"C:\backup\standards.zip"

Private bool ZipFile(string sourceFile, string destinationFile)

{

using (FileStream oldFile = File.OpenRead(sourceFile)

using (FileStream newFile = File.Create(destinationFile)

using (GZipStream compression = new GZipStream(newFile, CompressionMode.Compress))

{

byte[] buffer = new byte[1024];

int numberOfBytesRead = oldFile.Read(buffer, 0, buffer.Length);

while (numberOfBytesRead > 0)

{

compression.Write(buffer, 0, numberOfBytesRead);

numberOfBytesRead = oldFile.Read(buffer, 0, buffer.Length);

}

compression.Close();

}

}

Example data to run UnZipFile function :

sourceFile = @"C:\backup\standards.zip

destinationFile = @"C:\backup\standards.pdf"

Private bool UnZipFile(string sourceFile, string destinationFile)

{

using(FileStream compressFile = File.Open(sourceFile,FileMode.Open))

using (FileStream uncompressedFile = File.Create(destinationFile)

using (GZipStream compression = new GZipStream(compressFile,

CompressionMode.Decompress))

{

int data = compression.ReadByte();

while(data != -1)

{

uncompressedFile.WriteByte((byte) data);

data = compression.ReadByte();

}

compression.Close();

}

}

Another way to Zip/Unzip files using Shell32.DLL in C#.NET

First you need to download Shell32.dll, you can download this DLL from following location.

1) http://www.dlldump.com/download-dll-files_new.php/dllfiles/S/shell32.dll/6.00.2900.2180/download.html

2) http://www.dll-files.com/dllindex/dll-files.shtml?shell32

Namespace

using Shell32;

using System.IO;

Example data to run ZipFile function:

sourceFolder = @"D:\New Folder\"

destinationFile = @"C:\backup\test.zip"

Private bool ZipFile(string sourceFolder, string destinationFile)

{

byte[] emptyzip = 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};

FileStream fs = File.Create(@"C:\backup\test.zip");

fs.Write(emptyzip, 0, emptyzip.Length);

fs.Flush();

fs.Close();

fs = null;

//Copy a folder and its contents into the newly created zip file

Shell32.ShellClass sc = new Shell32.ShellClass();

Shell32.Folder SrcFlder = sc.NameSpace(sourceFolder)

Shell32.Folder DestFlder = sc.NameSpace(destinationFile)

Shell32.FolderItems items = SrcFlder.Items();

DestFlder.CopyHere(items, 20);

}

Example data to run UnZipFile function :

inputFileName = @"C:\backup\standards.zip

destinationPath = @"C:\backup\"

private string UnzipFile(string inputFileName, string destinationPath)

{

Shell shell = new ShellClass();

Folder sourceFolder = shell.NameSpace(inputFileName);

Folder destinationFolder = shell.NameSpace(destinationPath);

string outputFileName = sourceFolder.Items().Item(0).Name;

destinationFolder.CopyHere(sourceFolder.Items(),"");

return outputFileName;

}

Ritesh Kumar Kesharwani