using System;
using System.IO;

class HexDump {
public static void Main(string[] astrArgs) {
Stream stream = new FileStream(“c:a.txt”, FileMode.Open, FileAccess.Read, FileShare.Read);

byte[] abyBuffer = new byte[16];
long lAddress = 0;
int count;

while ((count = stream.Read(abyBuffer, 0, 16)) > 0) {
ComposeLine(lAddress, abyBuffer, count);
lAddress += 16;
}
}
public static void ComposeLine(long lAddress, byte[] abyBuffer, int count) {
Console.WriteLine(String.Format(“{0:X4}-{1:X4} “, (uint)lAddress / 65536, (ushort)lAddress));

for (int i = 0; i < 16; i++) { Console.WriteLine((i < count) ? String.Format("{0:X2}", abyBuffer[i]) : " "); Console.WriteLine((i == 7 && count > 7) ? “-” : ” “);
}
Console.WriteLine(” “);

for (int i = 0; i < 16; i++) { char ch = (i < count) ? Convert.ToChar(abyBuffer[i]) : ' '; Console.WriteLine(Char.IsControl(ch) ? "." : ch.ToString()); } } } [/csharp]

/*
C#: The Complete Reference
by Herbert Schildt

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/

// Demonstrate random access.

using System;
using System.IO;

public class RandomAccessDemo {
public static void Main() {
FileStream f;
char ch;

try {
f = new FileStream(“random.dat”, FileMode.Create);
}
catch(IOException exc) {
Console.WriteLine(exc.Message);
return ;
}

// Write the alphabet.
for(int i=0; i < 26; i++) { try { f.WriteByte((byte)('A'+i)); } catch(IOException exc) { Console.WriteLine(exc.Message); return ; } } try { // Now, read back specific values f.Seek(0, SeekOrigin.Begin); // seek to first byte ch = (char) f.ReadByte(); Console.WriteLine("First value is " + ch); f.Seek(1, SeekOrigin.Begin); // seek to second byte ch = (char) f.ReadByte(); Console.WriteLine("Second value is " + ch); f.Seek(4, SeekOrigin.Begin); // seek to 5th byte ch = (char) f.ReadByte(); Console.WriteLine("Fifth value is " + ch); Console.WriteLine(); // Now, read every other value. Console.WriteLine("Here is every other value: "); for(int i=0; i < 26; i += 2) { f.Seek(i, SeekOrigin.Begin); // seek to ith double ch = (char) f.ReadByte(); Console.Write(ch + " "); } } catch(IOException exc) { Console.WriteLine(exc.Message); } Console.WriteLine(); f.Close(); } } [/csharp]

   
 
/*
C#: The Complete Reference 
by Herbert Schildt 

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/

/* Copy a file. 
 
   To use this program, specify the name  
   of the source file and the destination file. 
   For example, to copy a file called FIRST.DAT 
   to a file called SECOND.DAT, use the following 
   command line. 
 
   CopyFile FIRST.DAT SECOND.DAT 
*/ 
 
using System; 
using System.IO;  
 
public class CopyFile { 
  public static void Main(string[] args) { 
    int i; 
    FileStream fin; 
    FileStream fout; 
 
    try { 
      // open input file 
      try { 
        fin = new FileStream(args[0], FileMode.Open); 
      } catch(FileNotFoundException exc) { 
        Console.WriteLine(exc.Message + "
Input File Not Found"); 
        return; 
      } 
 
      // open output file 
      try { 
        fout = new FileStream(args[1], FileMode.Create); 
      } catch(IOException exc) { 
        Console.WriteLine(exc.Message + "
Error Opening Output File"); 
        return; 
      } 
    } catch(IndexOutOfRangeException exc) { 
      Console.WriteLine(exc.Message + "
Usage: CopyFile From To"); 
      return; 
    } 
 
    // Copy File 
    try { 
      do { 
        i = fin.ReadByte(); 
        if(i != -1) fout.WriteByte((byte)i); 
      } while(i != -1); 
    } catch(IOException exc) { 
      Console.WriteLine(exc.Message + "File Error"); 
    } 
 
    fin.Close(); 
    fout.Close(); 
  } 
}


           
         
     

/*
C#: The Complete Reference
by Herbert Schildt

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/

// Write to a file.

using System;
using System.IO;

public class WriteToFile {
public static void Main(string[] args) {
FileStream fout;

// open output file
try {
fout = new FileStream(“test.txt”, FileMode.Create);
} catch(IOException exc) {
Console.WriteLine(exc.Message + ”
Error Opening Output File”);
return;
}

// Write the alphabet to the file.
try {
for(char c = 'A'; c <= 'Z'; c++) fout.WriteByte((byte) c); } catch(IOException exc) { Console.WriteLine(exc.Message + "File Error"); } fout.Close(); } } [/csharp]

   
 
/*
C#: The Complete Reference 
by Herbert Schildt 

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/

/* Display a text file. 
 
   To use this program, specify the name  
   of the file that you want to see. 
   For example, to see a file called TEST.CS, 
   use the following command line. 
 
   ShowFile TEST.CS 
*/ 
 
using System; 
using System.IO;  
 
public class ShowFile { 
  public static void Main(string[] args) { 
    int i; 
    FileStream fin; 
 
    try { 
      fin = new FileStream(args[0], FileMode.Open); 
    } catch(FileNotFoundException exc) { 
      Console.WriteLine(exc.Message); 
      return; 
    } catch(IndexOutOfRangeException exc) { 
      Console.WriteLine(exc.Message + "
Usage: ShowFile File"); 
      return; 
    } 
 
    // read bytes until EOF is encountered 
    do { 
      try { 
        i = fin.ReadByte(); 
      } catch(Exception exc) { 
        Console.WriteLine(exc.Message); 
        return; 
      } 
      if(i != -1) Console.Write((char) i); 
    } while(i != -1); 
 
    fin.Close(); 
  } 
}


           
         
     

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

Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/
// WriteOut.cs -- Writes the same string to a file and to the screen using
//                a common method.
//
//                Compile this program with the following command line:
//                    C:>csc WriteOut.cs
namespace nsStreams
{
    using System;
    // When using streams, you must declare that you are using System.IO
    using System.IO;
    
    public class WriteOut
    {
        static public void Main ()
        {
            string str = "This is a line of text
";
            
            // Open the standard output stream
            Stream ostrm = Console.OpenStandardOutput ();
            
            // Open a file. You should protect an open in a try ... catch block
            FileStream fstrm;
            try
            {
                fstrm = new FileStream ("./OutFile.txt", FileMode.OpenOrCreate);
            }
            catch
            {
                Console.WriteLine ("Failed to open file");
                return;
            }
            
            // Call WriteToStream() to write the same string to both
            WriteToStream (ostrm, str);
            WriteToStream (fstrm, str);
            
            // Close the file.
            fstrm.Close ();
            ostrm.Close ();
        }
        static public void WriteToStream (Stream strm, string text)
        {
            foreach (char ch in text)
            {
                strm.WriteByte ((Byte) ch);
            }
            // Flush the output to make it write
            strm.Flush ();
        }
    }
}



           
         
     

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

Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/
// StrmWrit.cs — Demonstrates opening/creating a file for writing and truncating
// its length to 0 bytes.
// Compile this program with the following command line:
// C:>csc StrmWrit.cs
using System;
using System.IO;

namespace nsStreams
{
public class StrmWrit
{
static public void Main ()
{
FileStream strm;
// Open or create the file for writing
try
{
strm = new FileStream (“./write.txt”, FileMode.OpenOrCreate, FileAccess.Write);
}
// If the open fails, the constructor will throw an exception.
catch (Exception e)
{
Console.WriteLine (e.Message);
Console.WriteLine (“Cannot open write.txt for writing”);
return;
}
// Truncate the file using the SetLength() method.
strm.SetLength (0);
Console.WriteLine (“Enter text. Type a blank line to exit
“);
// Accept text from the keyboard and write it to the file.
while (true)
{
string str = Console.ReadLine ();
if (str.Length == 0)
break;
byte [] b; // = new byte [str.Length];
StringToByte (str, out b);
strm.Write (b, 0, b.Length);
}
Console.WriteLine (“Text written to write.txt”);
// Close the stream
strm.Close ();
}
//
// Convert a string to a byte array, adding a carriage return/line feed to it
static protected void StringToByte (string str, out byte [] b)
{
b = new byte [str.Length + 2];
int x;
for (x = 0; x < str.Length; ++x) { b[x] = (byte) str[x]; } // Add a carriage return/line feed b[x] = 13; b[x + 1] = 10; } } } [/csharp]