BMP Dimensions with BinaryReader - Python Programming Exercise

In this exercise, you will develop a Python program to read the dimensions (width and height) of a BMP file using a BinaryReader-like approach. This exercise is perfect for practicing file handling, byte manipulation, and validation in Python. By implementing this program, you will gain hands-on experience in handling file operations, byte manipulation, and validation in Python. This exercise not only reinforces your understanding of file handling but also helps you develop efficient coding practices for managing user interactions.

Exercise

BMP Dimensions With Binaryreader

Objective

Develop a Python program to read the dimensions (width and height) of a BMP file using a BinaryReader-like approach.

A BMP file has a specific header structure that includes the following:

- "BM" at positions 0-1, indicating the file type.
- File size is at positions 2-5.
- Reserved space is from positions 6-7 and 8-9.
- Image data starts from positions 10-13.
- Bitmap header size is between positions 14-17.
- Width (in pixels) is located at positions 18-21.
- Height (in pixels) is located at positions 22-25.
- Planes count is at positions 26-27.
- Each point's size can be found at positions 28-29.
- Compression type (0 means no compression) is located from positions 30-33.
- Image size is at positions 34-37.
- Horizontal resolution is between positions 38-41.
- Vertical resolution is at positions 42-45.
- The size of the color table is located at positions 46-49.

Using these positions, the program must read and display the width and height of the BMP image.

Example Python Exercise

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# This program reads the width and height of a BMP image by parsing its header structure.

import struct

def read_bmp_dimensions(filename):
    try:
        # Open the BMP file in binary mode
        with open(filename, 'rb') as file:
            # Read the first 18 bytes to extract the relevant information
            header = file.read(18)
            
            # Check if the file is a valid BMP file by verifying "BM" signature
            if header[:2] != b'BM':
                print("The file is not a valid BMP file.")
                return

# Extract the width and height from the header (positions 18-21 for width and 22-25 for height)
            width, height = struct.unpack('<II', header[18:26])
            
            # Print the dimensions
            print(f"Width: {width} pixels")
            print(f"Height: {height} pixels")
    
    except FileNotFoundError:
        print("The specified file does not exist.")
    except Exception as e:
        print(f"An error occurred: {e}")

# Example usage
input_file = "example.bmp"  # Replace with your BMP file name
read_bmp_dimensions(input_file)

# This program reads the width and height of a BMP image by parsing its header structure.

import struct

def read_bmp_dimensions(filename):
    try:
        # Open the BMP file in binary mode
        with open(filename, 'rb') as file:
            # Read the first 18 bytes to extract the relevant information
            header = file.read(18)
            
            # Check if the file is a valid BMP file by verifying "BM" signature
            if header[:2] != b'BM':
                print("The file is not a valid BMP file.")
                return

            # Extract the width and height from the header (positions 18-21 for width and 22-25 for height)
            width, height = struct.unpack('


                     Output
Width: 800 pixels
Height: 600 pixels

                    
                        
                            
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BMP Dimensions with BinaryReader - Python Programming Exercise

Category

Managing Files

Exercise