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【CSharp】解压缩单个zip格式文件

作者:dezai / 发布于2013/12/26/ 319

using System.IO;
using System.IO.Compression;
string sourceFile=@"D:\2.zip";
string destinationFile=@"D:\1.txt";
    private const long BUFFER_SIZE = 20480;
      // make sure the source file is there
      if (File.Exists ( sourceFile ))
      {
      FileStream sourceStream = null;
      FileStream destinationStream = null;
      GZipStream decompressedStream = null;
      byte[] quartetBuffer = null;
      try
      {
        // Read in the compressed source stream
        sourceStream = new FileStream ( sourceFile, FileMode.Open );

        // Create a compression stream pointing to the destiantion stream
        decompressedStream = new DeflateStream ( sourceStream, CompressionMode.Decompress, true );

        // Read the footer to determine the length of the destiantion file
        quartetBuffer = new byte[4];
        int position = (int)sourceStream.Length - 4;
        sourceStream.Position = position;
        sourceStream.Read ( quartetBuffer, 0, 4 );
        sourceStream.Position = 0;
        int checkLength = BitConverter.ToInt32 ( quartetBuffer, 0 );

        byte[] buffer = new byte[checkLength + 100];

        int offset = 0;
        int total = 0;

        // Read the compressed data into the buffer
        while ( true )
        {
          int bytesRead = decompressedStream.Read ( buffer, offset, 100 );

          if ( bytesRead == 0 )
            break;

          offset += bytesRead;
          total += bytesRead;
        }

        // Now write everything to the destination file
        destinationStream = new FileStream ( destinationFile, FileMode.Create );
        destinationStream.Write ( buffer, 0, total );

        // and flush everyhting to clean out the buffer
        destinationStream.Flush ( );
      }
      catch ( ApplicationException ex )
      {
        Console.WriteLine(ex.Message, "解压文件时发生错误：");
      }
      finally
      {
        // Make sure we allways close all streams
        if ( sourceStream != null )
          sourceStream.Close ( );

        if ( decompressedStream != null )
          decompressedStream.Close ( );

        if ( destinationStream != null )
          destinationStream.Close ( );
      }
      }

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