Reading a binary file (1: BMP)

Proposed exercise

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Create a C# program to check if a BMP image file seems to be correct.

It must see if the first two bytes are B and M (ASCII codes 0x42 and 0x4D).

Output

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Solution

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using System;
using System.IO;

public class BmpFile
{
public static void Main() 
{    
byte data1, data2;

BinaryReader file;
file = new BinaryReader( File.Open( "1.bmp", FileMode.Open ) );

data1 = file.ReadByte();
data2 = file.ReadByte();

file.Close();

if ((data1 == 0x42) && (data2 == 0x4D))  // B M
Console.WriteLine("It seems to be a BMP file");
else
Console.WriteLine("It DOES NOT seem to be a BMP file");
}
}