BMP width and height, BinaryReader C# Exercise - C# Programming Course

// Import the System namespace for basic functionality
using System;  

// Import the IO namespace for file handling
using System.IO;  

// Create the class to read BMP file header
class BMPReader
{
    // Main method where the program starts
    static void Main(string[] args)
    {
        // Ask the user for the BMP file path
        Console.WriteLine("Enter the path of the BMP file:");  

        // Get the file path from the user
        string filePath = Console.ReadLine();  

        // Start of try block to handle any file or reading errors
        try
        {
            // Open the BMP file with BinaryReader to read the binary data
            using (BinaryReader reader = new BinaryReader(File.Open(filePath, FileMode.Open)))
            {
                // Check if the first two bytes are 'BM' to validate it as a BMP file
                if (reader.ReadByte() == 0x42 && reader.ReadByte() == 0x4D)
                {
                    // Skip the file size and reserved bytes (2 to 9)
                    reader.BaseStream.Seek(8, SeekOrigin.Begin);  

                    // Skip to the position where the width is stored (18-21)
                    int width = reader.ReadInt32();  

                    // Skip to the position where the height is stored (22-25)
                    int height = reader.ReadInt32();  

                    // Display the width and height of the BMP file
                    Console.WriteLine("Width: " + width + " pixels");
                    Console.WriteLine("Height: " + height + " pixels");
                }
                else
                {
                    // If the file is not a valid BMP file, inform the user
                    Console.WriteLine("The file is not a valid BMP file.");
                }
            }
        }
        catch (Exception ex)  // Catch any exceptions that may occur during file reading
        {
            // Print the exception message if an error occurs
            Console.WriteLine("An error occurred: " + ex.Message);  
        }
    }
}