在C#中利用SharpZipLib进行文件的压缩和解压缩

我在做项目的时候需要将文件进行压缩和解压缩，于是就从http://www.icsharpcode.net下载了关于压缩和解压缩的源码，但是下载下来后，面对这么多的代码，一时不知如何下手。只好耐下心来，慢慢的研究，总算找到了门路。针对自己的需要改写了文件压缩和解压缩的两个类，分别为ZipClass和UnZipClass。其中碰到了不少困难，就决定写出来压缩和解压的程序后，一定把源码贴出来共享，让首次接触压缩和解压缩的朋友可以少走些弯路。下面就来解释如何在C#里用http://www.icsharpcode.net下载的SharpZipLib进行文件的压缩和解压缩。

首先需要在项目里引用SharpZipLib.dll。然后修改其中的关于压缩和解压缩的类。实现源码如下：

/// <summary>

/// 压缩文件

/// </summary>

using System;

using System.IO;

using ICSharpCode.SharpZipLib.Checksums;

using ICSharpCode.SharpZipLib.Zip;

using ICSharpCode.SharpZipLib.GZip;

namespace Compression

{

public class ZipClass

{

public void ZipFile(string FileToZip, string ZipedFile ,int CompressionLevel, int BlockSize)

{

//如果文件没有找到，则报错

if (! System.IO.File.Exists(FileToZip))

{

throw new System.IO.FileNotFoundException("The specified file " + FileToZip + " could not be found. Zipping aborderd");

}

System.IO.FileStream StreamToZip = new System.IO.FileStream(FileToZip,System.IO.FileMode.Open , System.IO.FileAccess.Read);

System.IO.FileStream ZipFile = System.IO.File.Create(ZipedFile);

ZipOutputStream ZipStream = new ZipOutputStream(ZipFile);

ZipEntry ZipEntry = new ZipEntry("ZippedFile");

ZipStream.PutNextEntry(ZipEntry);

ZipStream.SetLevel(CompressionLevel);

byte[] buffer = new byte[BlockSize];

System.Int32 size =StreamToZip.Read(buffer,0,buffer.Length);

ZipStream.Write(buffer,0,size);

try

{

while (size < StreamToZip.Length)

{

int sizeRead =StreamToZip.Read(buffer,0,buffer.Length);

ZipStream.Write(buffer,0,sizeRead);

size += sizeRead;

}

}

catch(System.Exception ex)

{

throw ex;

}

ZipStream.Finish();

ZipStream.Close();

StreamToZip.Close();

}

public void ZipFileMain(string[] args)

{

string[] filenames = Directory.GetFiles(args[0]);

Crc32 crc = new Crc32();

ZipOutputStream s = new ZipOutputStream(File.Create(args[1]));

s.SetLevel(6); // 0 - store only to 9 - means best compression

foreach (string file in filenames)

{

//打开压缩文件

FileStream fs = File.OpenRead(file);

byte[] buffer = new byte[fs.Length];

fs.Read(buffer, 0, buffer.Length);

ZipEntry entry = new ZipEntry(file);

entry.DateTime = DateTime.Now;

// set Size and the crc, because the information

// about the size and crc should be stored in the header

// if it is not set it is automatically written in the footer.

// (in this case size == crc == -1 in the header)

// Some ZIP programs have problems with zip files that don't store

// the size and crc in the header.

entry.Size = fs.Length;

fs.Close();

crc.Reset();

crc.Update(buffer);

entry.Crc = crc.Value;

s.PutNextEntry(entry);

s.Write(buffer, 0, buffer.Length);

}

s.Finish();

s.Close();

}

}

}

现在再来看看解压文件类的源码

/// <summary>

/// 解压文件

/// </summary>

using System;

using System.Text;

using System.Collections;

using System.IO;

using System.Diagnostics;

using System.Runtime.Serialization.Formatters.Binary;

using System.Data;

using ICSharpCode.SharpZipLib.BZip2;

using ICSharpCode.SharpZipLib.Zip;

using ICSharpCode.SharpZipLib.Zip.Compression;

using ICSharpCode.SharpZipLib.Zip.Compression.Streams;

using ICSharpCode.SharpZipLib.GZip;

namespace DeCompression

{

public class UnZipClass

{

public void UnZip(string[] args)

{

ZipInputStream s = new ZipInputStream(File.OpenRead(args[0]));

ZipEntry theEntry;

while ((theEntry = s.GetNextEntry()) != null)

{

string directoryName = Path.GetDirectoryName(args[1]);

string fileName = Path.GetFileName(theEntry.Name);

//生成解压目录

Directory.CreateDirectory(directoryName);

if (fileName != String.Empty)

{

//解压文件到指定的目录

FileStream streamWriter = File.Create(args[1]+theEntry.Name);

int size = 2048;

byte[] data = new byte[2048];

while (true)

{

size = s.Read(data, 0, data.Length);

if (size > 0)

{

streamWriter.Write(data, 0, size);

}

else

{

break;

}

}

streamWriter.Close();

}

}

s.Close();

}

}

}

有了压缩和解压缩的类以后，就要在窗体里调用了。怎么？是新手，不会调用？Ok,接着往下看如何在窗体里调用。

首先在窗体里放置两个命令按钮（不要告诉我你不会放啊~），然后编写以下源码

/// <summary>

/// 调用源码

/// </summary>

private void button2_Click_1(object sender, System.EventArgs e)

{

string []FileProperties=new string[2];

FileProperties[0]="C:\\unzipped\\";//待压缩文件目录

FileProperties[1]="C:\\zip\\a.zip"; //压缩后的目标文件

ZipClass Zc=new ZipClass();

Zc.ZipFileMain(FileProperties);

}

private void button2_Click(object sender, System.EventArgs e)

{

string []FileProperties=new string[2];

FileProperties[0]="C:\\zip\\test.zip";//待解压的文件

FileProperties[1]="C:\\unzipped\\";//解压后放置的目标目录

UnZipClass UnZc=new UnZipClass();

UnZc.UnZip(FileProperties);

}

好了，到此为止，如何压缩和解压缩的类都已经完成了，需要的朋友直接拿走调吧。