利用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