RealTimeZip Class

public class RealTimeZip : FileSystem

Public Class RealTimeZip
   Inherits FileSystem

public ref class RealTimeZip : public FileSystem

Shows how to use FindNextItemHeader method to find archive item header and ExtractFile method to extract the found item.

using System.IO;
using ComponentPro.Compression;

...

// Create a new instance of a real-time zip object.
RealTimeZip realTimeZip = new RealTimeZip();
// Specify the stream where the being compressed file will be saved.
realTimeZip.CompressedStream = new FileStream(@"C:\Test\archive.zip", FileMode.Open);
// Open the archive.
realTimeZip.Open(false);

const string OutputDir = @"C:\Temp";

// Find next archive item header record within the stream.  
// The archive item record contains information about the file like file name, size, attributes, comment, etc. 
// The compressed data follows the archive item header. To read and extract the compressed data,  
// we need to read the header first.
ArchiveItem header;
while ((header = realTimeZip.FindNextItemHeader()) != null)
{
    string path = System.IO.Path.Combine(OutputDir, header.FullName);

    string dir = System.IO.Path.GetDirectoryName(path);
    if (!Directory.Exists(dir))
        Directory.CreateDirectory(dir);

    // Extract to a file. 
    realTimeZip.ExtractFile(path);
    
    // The above code fragment equals to the following commented code: 
    // using (FileStream fileStream = new FileStream(@"C:\Temp\" + header.Name, 
    //    FileMode.Create, FileAccess.Write, FileShare.Write)) 
    // { 
    //    realTimeZip.ExtractFile(fileStream); 
    // }
}

// Save the central directory to the archive.
realTimeZip.Close();

// We need to close the CompressedStream manually because 
// the Close method just write the central directory information to the archive.
realTimeZip.CompressedStream.Close();

Imports System.IO
Imports ComponentPro.Compression

...

' Create a new instance of a real-time zip object. 
Dim realTimeZip As New RealTimeZip()
' Specify the stream where the being compressed file will be saved.
realTimeZip.CompressedStream = New FileStream("C:\Test\archive.zip", FileMode.Open)
' Open the archive.
realTimeZip.Open(False)

Const OutputDir As String = "C:\Temp" 
 
' Find next archive item header record within the stream.  
' The archive item record contains information about the file like file name, size, attributes, comment, etc. 
' The compressed data follows the archive item header. To read and extract the compressed data,  
' we need to read the header first. 
Dim header As ArchiveItem
header = realTimeZip.FindNextItemHeader()
Do While header IsNot Nothing 
    Dim path As String = System.IO.Path.Combine(OutputDir, header.FullName)

    Dim dir As String = System.IO.Path.GetDirectoryName(path)
    If Not Directory.Exists(dir) Then 
        Directory.CreateDirectory(dir)
    End If 
 
    ' Extract to a file. 
    realTimeZip.ExtractFile(path)

    ' The above code fragment equals to the following commented code: 
    ' using (FileStream fileStream = new FileStream(@"C:\Temp\" + header.Name, 
    '    FileMode.Create, FileAccess.Write, FileShare.Write)) 
    ' { 
    '    realTimeZip.ExtractFile(fileStream); 
    ' } 
    header = realTimeZip.FindNextItemHeader()
Loop 
 
' Save the central directory to the archive.
realTimeZip.Close()

' We need to close the CompressedStream manually because 
' the Close method just write the central directory information to the archive.
realTimeZip.CompressedStream.Close()

Shows how to use AddFile method to add file to an archive.

using ComponentPro.Compression;
using System.IO;

...

// Create a new instance of the RealTimeZip class.
RealTimeZip realTimeZip = new RealTimeZip();

// Specify the stream where the being compressed file will be saved.
realTimeZip.CompressedStream = new FileStream(@"C:\Temp\archive.zip", FileMode.Create);

// Open the archive and set creating a new one.
realTimeZip.Open(true);

// Add a file to the archive. 
using(FileStream fileStream = new FileStream(@"C:\Test\test1.dat", FileMode.Open))
{
    realTimeZip.AddFile(fileStream, "file.txt");
}

// Add a file to the archive with comment. 
using (FileStream fileStream2 = new FileStream(@"C:\Test\test2.dat", FileMode.Open))
{
    realTimeZip.AddFile(fileStream2, "file2.txt", "comment for my file");
}

// or with a simple usage to add a file on local disk.
realTimeZip.AddFile(@"C:\test\file.dat", "myfile.dat", "my comment");

// Save the central directory to the archive.
realTimeZip.Close();

// We need to close the CompressedStream manually because 
// the Close method just write the central directory information to the archive.
realTimeZip.CompressedStream.Close();

Imports ComponentPro.Compression
Imports System.IO

...

' Create a new instance of the RealTimeZip class. 
Dim realTimeZip As New RealTimeZip()

' Specify the stream where the being compressed file will be saved.
realTimeZip.CompressedStream = New FileStream("C:\Temp\archive.zip", FileMode.Create)

' Open the archive and set creating a new one.
realTimeZip.Open(True)

' Add a file to the archive.
Using fileStream As New FileStream("C:\Test\test1.dat", FileMode.Open)
    realTimeZip.AddFile(fileStream, "file.txt")
End Using

' Add a file to the archive with comment.
Using fileStream2 As New FileStream("C:\Test\test2.dat", FileMode.Open)
    realTimeZip.AddFile(fileStream2, "file2.txt", "comment for my file")
End Using

' or with a simple usage to add a file on local disk.
realTimeZip.AddFile("C:\test\file.dat", "myfile.dat", "my comment")

' Save the central directory to the archive.
realTimeZip.Close()

' We need to close the CompressedStream manually because 
' the Close method just write the central directory information to the archive.
realTimeZip.CompressedStream.Close()

Reference