C#2.0实现加压解压(V1.0)

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, 0100);
                    
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;
        }
    }
}


这个版本暂时存在一个问题:解压后的文件没有后缀名,需要自己加上。
下一个版本解决此问题。
posted @ 2007-04-30 14:35  小y  阅读(1647)  评论(1编辑  收藏  举报