Make a Zip/UnZip software using SharpZipLib

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• Download project.zip - 188.4 KB

Introduction

This article shows a simple way to make a Zip/UnZip software using SharpZipLib.

Background

SharpZipLib is a very nice OpenSource library. It's a Zip, GZip, Tar and BZip2 library written entirely in C# for the .NET platform. http://www.icsharpcode.net/OpenSource/SharpZipLib/Default.aspx

Using the code

You should use FileStream class as input/output. ZipInputStream and ZipOutputStream is two important class in the project. ZipInputStream is used to unzip the zipped data to ordinary data. And ZipOutputStream is used to zip the ordinary data to zipped data. And there is another class called ZipEntry. ZipEntry is an item zipped in the .zip file.

And I use a new thread to do the zip/unzip work. Because the large file may make the UI form not responding.

This is the method of zip:

    public static void Zip(string SrcFile, string DstFile, int BufferSize)
    {
        FileStream fileStreamIn = new FileStream(SrcFile, FileMode.Open, FileAccess.Read);
        FileStream fileStreamOut = new FileStream(DstFile, FileMode.Create, FileAccess.Write);
        ZipOutputStream zipOutStream = new ZipOutputStream(fileStreamOut);
        byte[] buffer = new byte;
        ZipEntry entry = new ZipEntry(Path.GetFileName(SrcFile));
        zipOutStream.PutNextEntry(entry);
        int size;
        do
        {
            size = fileStreamIn.Read(buffer, 0, buffer.Length);
            zipOutStream.Write(buffer, 0, size);
        } while (size > 0);
        zipOutStream.Close();
        fileStreamOut.Close();
        fileStreamIn.Close();
    }

This is the method of unzip:

    public static void UnZip(string SrcFile, string DstFile, int BufferSize)
    {
        FileStream fileStreamIn = new FileStream(SrcFile, FileMode.Open, FileAccess.Read);
        ZipInputStream zipInStream = new ZipInputStream(fileStreamIn);
        ZipEntry entry = zipInStream.GetNextEntry();
        FileStream fileStreamOut = new FileStream(DstFile + @"\" + entry.Name, FileMode.Create, FileAccess.Write);
        int size;
        byte[] buffer = new byte;
        do
        {
            size = zipInStream.Read(buffer, 0, buffer.Length);
            fileStreamOut.Write(buffer, 0, size);
        } while (size > 0);
        zipInStream.Close();
        fileStreamOut.Close();
        fileStreamIn.Close();
    }

Points of Interest

So you can see it's very easy to make a small Zip/UnZip software.SharpZipLib is very powerful and you can do a lot of things.

History

Sept. 14, 2007 -- upload