在C#中利用SharpZipLib进行文件的压缩和解压缩收藏

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(http://www.icsharpcode.net/OpenSource/SharpZipLib/Download.aspx)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);


FileInfo info = new FileInfo(file);


ZipEntry entry = new ZipEntry(info.Name); //压缩后显示的路径为当前压缩的目录




//ZipEntry entry = new ZipEntry(file); //压缩后显示全路径


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);


}