Reading a binary file (1: BMP) Learn programming Java

Lesson:

File Management


Exercise:

Reading a binary file (1: BMP) 54


Objetive:

Create a java 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).


Code:

public class Main
{
    public static void main(String[] args)
	{
		byte data1, data2;

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

		// Read data
		data1 = myFile.ReadByte();
		data2 = myFile.ReadByte();

		//Close file
		myFile.Close();

		//Check Data
		if ((data1 == 0x42) && (data2 == 0x4D)) // B M
		{
			System.out.println("It seems to be a BMP file");
		}
		else
		{
			System.out.println("It DOES NOT seem to be a BMP file");
		}
	}
}