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在C#中利用SharpZipLib进行文件的压缩和解压缩-.NET教程,C#语言

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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 dont 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。

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