C# 0 The Complete Reference

PART I

C h a p t e r   1 4 :  

U s i n g   I / O  

377

PART IPART I

/* 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;

class CopyFile {

  static void Main(string[] args) {

    int i;

    FileStream fin;

    FileStream fout;

    if(args.Length != 2) {

      Console.WriteLine("Usage: CopyFile From To");

      return;

    }

    // Open input file.

    try {

      fin = new FileStream(args[0], FileMode.Open);

    } catch(IOException exc) {

      Console.WriteLine("Cannot Open Input File");

      Console.WriteLine(exc.Message);

      return;

    }

    // Open output file.

    try {

      fout = new FileStream(args[1], FileMode.Create);

    } catch(IOException exc) {

      Console.WriteLine("Cannot Open Output File");

      Console.WriteLine(exc.Message);

      fin.Close();

      return;

    }

    // Copy File

    try {

      do {

        i = fin.ReadByte();

        if(i != -1) fout.WriteByte((byte)i);

      } while(i != -1);

    } catch(IOException exc) {

      Console.WriteLine("Error Copying File");

      Console.WriteLine(exc.Message);

    }

    fin.Close();

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P a r t   I :  

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    fout.Close();

  }

}