Practice Exercises C# Sharp - Learn to program with performing exercises C# Sharp

Practice Exercises C# Sharp

Learn to program with performing exercises C# Sharp

Encrypt a BMP file - Practice Exercises C# Sharp
Practice Exercises C# Sharp4,55302940

Encrypt a BMP file - Practice Exercises C# Sharp


Lesson 8:

File management


Exercise 8.29:

Encrypt a BMP file


Objetive:

Create a program to encrypt/decrypt a BMP image file, by changing the "BM" mark in the first two bytes with MB and vice versa.

Use the advanced FileStream constructor to allow simultaneous reading and writing.


Source Code:


using System;
using System.IO;
namespace Bmp
{
    class Program
    {
        static void Main(string[] args)
        {
            FileStream myFile;

            Console.Write("Enter the name of file: ");
            string fileName = Console.ReadLine();

            if (!File.Exists(fileName))
            {
                Console.WriteLine("The file not exists!!!");
                return;
            }

            try
            {
                myFile = File.Open(fileName, FileMode.Open, FileAccess.ReadWrite);
                byte b1 = (byte)myFile.ReadByte();
                byte b2 = (byte)myFile.ReadByte();

                if ((Convert.ToChar(b1) != 'B')
                    || (Convert.ToChar(b2) != 'M'))
                {
                    Console.WriteLine("This File is NOT a BMP file");
                }
                else
                {
                    myFile.Seek(0, SeekOrigin.Begin);
                    myFile.WriteByte((byte)'M');
                    myFile.WriteByte((byte)'B');
                }
                myFile.Close();
            }
            catch (Exception e)
            {
                Console.WriteLine("Error: {0}!!!", e.message());
            }
        }
    }
}
Exercisey 8.29

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