原文地址: http://www.csdn.com.cn/html/040531/200441448014540.html
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。 |