C#实现加压解压（v2.1）

用.net2.0中的using System.IO.Compression;
实现加压和解压的源码。

关于.net2.0中的加压解压类：
GZipStream类表示 GZip 数据格式，它使用无损压缩和解压缩文件的行业标准算法。这种格式包括一个检测数据损坏的循环冗余校验值。此外还有另一个加压类DeflateStream；

程序界面：


程序清单：

using  System;
using  System.Collections.Generic;
using  System.ComponentModel;
using  System.Data;
using  System.Drawing;
using  System.Text;
using  System.Windows.Forms;
using  System.IO;
using  System.IO.Compression;

namespace  zipTest
{
     public  partial  class  Form1 : Form
    {
         public  Form1()
        {
            InitializeComponent();
        }
         /* 取消 */
         private   void  button4_Click( object  sender, EventArgs e)
        {
             this .Close();
        }
         /* 确定 */
         private   void  button3_Click( object  sender, EventArgs e)
        {
             bool  success  =   false ;  // 默认失败
             string  err  =   "" ;
             try
            {
                 if  (r_compress.Checked  ==   true )
                {
                    success  =  GzipCompress(t_source.Text, t_dis.Text);
                }
                 if  (r_deCompress.Checked  ==   true )
                {
                    success  =  GzipDecompress(t_source.Text, t_dis.Text);
                }
            }
             catch  (Exception ex)
            {
                err = ex.Message.ToString();
            }
             if  (success  ==   false )
                MessageBox.Show( " 操作失败！ "   +  err);
             else
                MessageBox.Show( " 操作成功！ " );
        }
         /* 选择源文件 */
         private   void  button1_Click( object  sender, EventArgs e)
        {
             if  (openFileDialog1.ShowDialog()  ==  DialogResult.OK)
            {
                t_source.Text  =  openFileDialog1.FileName;
            }
        }
         /* 选择目标路径 */
         private   void  button2_Click( object  sender, EventArgs e)
        {
             if  (folderBrowserDialog1.ShowDialog()  ==  DialogResult.OK)
            {
                t_dis.Text  =  folderBrowserDialog1.SelectedPath;
            }
        }
         /* 加压 */
         public   bool  GzipCompress( string  sourceFile, string  disPath)
        {
             // 路径合法性检测
             if  ( ! File.Exists(sourceFile))
                 throw   new  FileNotFoundException();
             if  ( ! Directory.Exists(disPath))
                 throw   new  DirectoryNotFoundException();
             if  ( ! disPath.EndsWith( " \\ " ))
                disPath  +=   " \\ " ;
             // 生成压缩后文件名
             string  oldName  =  Path.GetFileNameWithoutExtension(sourceFile);
             string  newName  =  oldName  +   " 压缩文件.gzip " ;
             bool  result  =   true ; // 默认成功
            FileStream fs1  =   null ;
            FileStream fs2  =   null ;
            GZipStream zips  = null ;
             try
            {
                fs1  =   new  FileStream(sourceFile, FileMode.Open, FileAccess.Read);
                fs2  =   new  FileStream(disPath  +  newName, FileMode.OpenOrCreate, FileAccess.Write);
                zips  =   new  GZipStream(fs2, CompressionMode.Compress);
                 byte [] tempb  =   new   byte [fs1.Length];
                fs1.Read(tempb,  0 , ( int )fs1.Length);
                  zips.Write(tempb,  0 , tempb.Length);
            }
             catch  
            {
                result = false ;  // 执行失败
            }
             finally
            {
                 if  (zips  !=   null )
                    zips.Close();
                 if  (fs1  !=   null )
                    fs1.Close();
                 if  (fs2  !=   null )
                    fs2.Close();
            }
             return  result;
        }
         /* 解压 */
         public   bool  GzipDecompress( string  sourceFile, string  disPath)
        {
             // 路径合法性检测
             if  ( ! File.Exists(sourceFile))
                 throw   new  FileNotFoundException();
             if  ( ! Directory.Exists(disPath))
                 throw   new  DirectoryNotFoundException();
             if  ( ! disPath.EndsWith( " \\ " ))
                disPath  +=   " \\ " ;
             // 生成解压后的文件名
             string  outFile  =  disPath  +  Path.GetFileNameWithoutExtension(sourceFile);
             bool  result  =   true ; // 默认成功
            FileStream fs1  =   null ;
            FileStream fs2  =   null ;
            GZipStream zips  =   null ;
             try
            {
                fs1  =   new  FileStream(sourceFile, FileMode.Open, FileAccess.Read);
                fs2  =   new  FileStream(outFile, FileMode.OpenOrCreate, FileAccess.Write);
                zips  =   new  GZipStream(fs1, CompressionMode.Decompress);
                 byte [] tempb  =   new   byte [ 100 ];
                 int  size  =   0 ;
                 while  ( true )
                {
                    size  =  zips.Read(tempb,  0 ,  100 );
                     if  (size  >   0 )
                        fs2.Write(tempb,  0 , size);
                     else
                         break ;
                }
            }
             catch
            {
                result  =   false ;  // 执行失败
            }
             finally
            {
                 if  (zips  !=   null )
                    zips.Close();
                 if  (fs1  !=   null )
                    fs1.Close();
                 if  (fs2  !=   null )
                    fs2.Close();
            }
             return  result;
        }
    }
}

在前一版本的基础上改进了一些地方
把压缩文件名加进压缩后的文件中，解压还原成原文件而不是无尾文件

如果这个版本代码难解，可以先看看上一版本

界面：


代码清单：

using  System;
using  System.Collections.Generic;
using  System.ComponentModel;
using  System.Data;
using  System.Drawing;
using  System.Text;
using  System.Windows.Forms;
using  System.IO;
using  System.IO.Compression;

namespace  zipTest
{
     public  partial  class  Form1 : Form
    {
         public  Form1()
        {
            InitializeComponent();
        }
         /* 取消 */
         private   void  button4_Click( object  sender, EventArgs e)
        {
             this .Close();
        }
         /* 确定 */
         private   void  button3_Click( object  sender, EventArgs e)
        {
             bool  success  =   false ;  // 默认失败
             string  err  =   "" ;
             try
            {
                 if  (r_compress.Checked  ==   true )
                {
                    success  =  GzipCompress(t_source.Text, t_dis.Text);
                }
                 if  (r_deCompress.Checked  ==   true )
                {
                    success  =  GzipDecompress(t_source.Text, t_dis.Text);
                }
            }
             catch  (Exception ex)
            {
                err = ex.Message.ToString();
            }
             if  (success  ==   false )
                MessageBox.Show( " 操作失败！ "   +  err);
             else
                MessageBox.Show( " 操作成功！ " );
        }
         /* 选择源文件 */
         private   void  button1_Click( object  sender, EventArgs e)
        {
             if  (openFileDialog1.ShowDialog()  ==  DialogResult.OK)
            {
                t_source.Text  =  openFileDialog1.FileName;
            }
        }
         /* 选择目标路径 */
         private   void  button2_Click( object  sender, EventArgs e)
        {
             if  (folderBrowserDialog1.ShowDialog()  ==  DialogResult.OK)
            {
                t_dis.Text  =  folderBrowserDialog1.SelectedPath;
            }
        }
         /* 加压 */
         public   bool  GzipCompress( string  sourceFile, string  disPath)
        {
             // 路径合法性检测
             if  ( ! File.Exists(sourceFile))
                 throw   new  FileNotFoundException();
             if  ( ! Directory.Exists(disPath))
                 throw   new  DirectoryNotFoundException();
             if  ( ! disPath.EndsWith( " \\ " ))
                disPath  +=   " \\ " ;
             // 生成压缩后文件名
             string  oldName  =  Path.GetFileNameWithoutExtension(sourceFile);
             string  newName  =  oldName  +   " 压缩文件.gzip " ;
             bool  result  =   true ; // 默认成功
            FileStream fs1  =   null ;
            FileStream fs2  =   null ;
            GZipStream zips  = null ;
             try
            {
                fs1  =   new  FileStream(sourceFile, FileMode.Open, FileAccess.Read);
                fs2  =   new  FileStream(disPath  +  newName, FileMode.OpenOrCreate, FileAccess.Write);
                zips  =   new  GZipStream(fs2, CompressionMode.Compress);
                 byte [] tempb  =   new   byte [fs1.Length];
                fs1.Read(tempb,  0 , ( int )fs1.Length);
                 // 将加压前文件名保存到加压前的数组中
                 // 第一个字节保存文件名的长度，
                 byte [] exb  =  System.Text.Encoding.Unicode.GetBytes(Path.GetFileName(sourceFile));
                 byte [] lastb  =   new   byte [fs1.Length  +  exb.Length + 1 ];
                lastb[ 0 ]  =  Convert.ToByte(exb.Length);
                exb.CopyTo(lastb,  1 );
                tempb.CopyTo(lastb, exb.Length + 1 );
                 // 压缩文件
                zips.Write(lastb,  0 , lastb.Length);
            }
             catch (Exception ex)
            {
                result = false ;  // 执行失败
                 throw  ex;
            }
             finally
            {
                 if  (zips  !=   null )
                    zips.Close();
                 if  (fs1  !=   null )
                    fs1.Close();
                 if  (fs2  !=   null )
                    fs2.Close();
            }
             return  result;
        }
         /* 解压 */
         public   bool  GzipDecompress( string  sourceFile, string  disPath)
        {
             // 路径合法性检测
             if  ( ! File.Exists(sourceFile))
                 throw   new  FileNotFoundException();
             if  ( ! Directory.Exists(disPath))
                 throw   new  DirectoryNotFoundException();
             if  ( ! disPath.EndsWith( " \\ " ))
                disPath  +=   " \\ " ;
           
             bool  result  =   true ; // 默认成功
            FileStream fs1  =   null ;
            FileStream fs2  =   null ;
            MemoryStream ms  =   null ;
            GZipStream zips  =   null ;
             try
            {
                fs1  =   new  FileStream(sourceFile, FileMode.Open, FileAccess.Read);
                ms  =   new  MemoryStream();
                zips  =   new  GZipStream(fs1, CompressionMode.Decompress);
                 byte [] tempb  =   new   byte [ 100 ];
                 int  size  =   0 ;
                 while  ( true )
                {
                    size  =  zips.Read(tempb,  0 ,  100 );
                     if  (size  >   0 )
                        ms.Write(tempb,  0 , size);
                     else
                         break ;
                }
                 byte [] resultb  =   new   byte [ms.Length];
                 // 分析出加压前的文件名exName
                ms.Position  =   0 ;
                ms.Read(resultb,  0 , ( int )ms.Length);
                 int  exlen = Convert.ToInt16(resultb[ 0 ]);
                 string  exName  =  System.Text.Encoding.Unicode.GetString(resultb, 1 ,exlen);
                 string  outFile  =  disPath  +  exName;
                fs2  =   new  FileStream(outFile, FileMode.OpenOrCreate, FileAccess.Write);
                fs2.Write(resultb, exlen  +   1 , resultb.Length  -  exlen  -   1 );
            }
             catch (Exception ex)
            {
                result  =   false ;  // 执行失败
                 throw  ex;
            }
             finally
            {
                 if  (zips  !=   null )
                    zips.Close();
                 if  (fs1  !=   null )
                    fs1.Close();
                 if  (fs2  !=   null )
                    fs2.Close();
                 if  (ms  !=   null )
                    ms.Close();
            }
             return  result;
        }
    }
}

转载于:https://www.cnblogs.com/liufei88866/archive/2008/03/07/1094702.html