The use of a buffered stream to serve as intermediate data holder for another stream : Stream Read Write : File Stream C# Source Code

    

/*
C# Programming Tips & Techniques
by Charles Wright, Kris Jamsa

Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/
// BufStrm.cs -- demonstates the use of a buffered stream to serve
//               as intermediate data holder for another stream.
//
//                Compile this program with the following command line:
//                    C:>csc BufStrm.cs
using System;
using System.IO;

namespace nsStreams
{
    public class BufStrm
    {
        static public void Main ()
        {
            FileStream strm;
            try
            {
                strm = new FileStream ("./BufStrm.txt",
                                       FileMode.OpenOrCreate,
                                       FileAccess.Write);
            }
            catch (Exception e)
            {
                Console.WriteLine (e.Message);
                Console.WriteLine ("Cannot open ./BufStrm.txt");
                return;
            }
            strm.SetLength (0);
            BufferedStream bstrm = new BufferedStream (strm);
            string str = "Now is the time for all good men to " +
                         "come to the aid of their Teletype.\r\n";
            byte [] b;
            StringToByte (out b, str);
            bstrm.Write (b, 0, b.Length);
// Save the current position to fix an error.
            long Pos = bstrm.Position;
            Console.WriteLine ("The buffered stream position is "
                               + bstrm.Position);
            Console.WriteLine ("The underlying stream position is "
                               + strm.Position);
            str = "the quick red fox jumps over the lazy brown dog.\r\n";
            StringToByte (out b, str);
            bstrm.Write (b, 0, b.Length);
            Console.WriteLine ("\r\nThe buffered stream position is " +
                               bstrm.Position);
            Console.WriteLine ("The underlying stream position is still "
                               + strm.Position);
// Fix the lower case letter at the beginning of the second string
            bstrm.Seek (Pos, SeekOrigin.Begin);
            b[0] = (byte) 'T';
            bstrm.Write (b, 0, 1);
// Flush the buffered stream. This will force the data into the
// underlying stream.
            bstrm.Flush ();
            bstrm.Close ();
            strm.Close ();
        }
//
// Convert a buffer of type string to byte
        static void StringToByte (out byte [] b, string str)
        {
            b = new byte [str.Length];
            for (int x = 0; x < str.Length; ++x)
            {
                b[x] = (byte) str [x];
            }
        }
    }
}


//File: BufStrm.txt
/*
Now is the time for all good men to come to the aid of their Teletype.
The quick red fox jumps over the lazy brown dog.

*/