compressionfile.cs

在线压缩和解压

using System;
using System.IO;
using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.GZip;
using ICSharpCode.SharpZipLib.BZip2;
using ICSharpCode.SharpZipLib.Checksums;
using ICSharpCode.SharpZipLib.Zip.Compression;
using ICSharpCode.SharpZipLib.Zip.Compression.Streams;

namespace WebApplication3
{
	#region ZipClass 压缩文件
	public class ZipClass
	{
		public void ZipFile(string FileToZip, string ZipedFile ,int CompressionLevel, int BlockSize,string password)
		{
			//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]);
			string[] filenames = new string[]{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();
		}
	}
	#endregion

	#region UnZipClass 解压文件
	public class UnZipClass
	{   
		/// <summary>
		/// 解压文件
		/// </summary>
		/// <param name="args">包含要解压的文件名和要解压到的目录名数组</param>
		public void UnZip(string[] args)
		{
			ZipInputStream s = new ZipInputStream(File.OpenRead(args[0]));
			try
			{				
				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]+fileName);
    
						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();
			}
			catch(Exception eu)
			{
				throw eu;
			}
			finally
			{
				s.Close();
			}

		}//end UnZip


	}//end UnZipClass
	#endregion

	#region AttachmentUnZip
	public class AttachmentUnZip
	{
		public AttachmentUnZip()
		{			
		}
		public static void UpZip(string zipFile)
		{
			string []FileProperties=new string[2];

			FileProperties[0]=zipFile;//待解压的文件

			FileProperties[1]=zipFile.Substring(0,zipFile.LastIndexOf("\\")+1);//解压后放置的目标目录

			UnZipClass UnZc=new UnZipClass();

			UnZc.UnZip(FileProperties);
		}

	}
	#endregion
}