ansi c read write bmp

To read and write BMP files using ANSI C, you can follow these steps:

  1. Include the necessary header files:
  2. stdio.h for standard input/output operations.
  3. stdint.h for fixed-width integer types.

  4. stdlib.h for memory allocation and other general functions.

  5. Define necessary data structures:

  6. BITMAPFILEHEADER structure to store the BMP file header.
  7. BITMAPINFOHEADER structure to store the BMP info header.

  8. RGBTRIPLE structure to store the RGB color values.

  9. Open the BMP file for reading:

  10. Use the fopen() function to open the file in binary mode.

  11. Check if the file was successfully opened.

  12. Read the BMP file headers:

  13. Use the fread() function to read the BITMAPFILEHEADER and BITMAPINFOHEADER structures from the file.

  14. Allocate memory for the pixel data:

  15. Calculate the size of the pixel data based on the width, height, and color depth information from the headers.

  16. Use the malloc() function to allocate memory for the pixel data.

  17. Read the pixel data:

  18. Use the fread() function to read the pixel data from the file into the allocated memory.

  19. Manipulate or process the pixel data as needed:

  20. You can perform various operations on the pixel data, such as modifying colors, applying filters, or extracting information.

  21. Open a new BMP file for writing:

  22. Use the fopen() function to open a new file in binary mode for writing.

  23. Check if the file was successfully opened.

  24. Write the BMP file headers:

  25. Use the fwrite() function to write the BITMAPFILEHEADER and BITMAPINFOHEADER structures to the new file.

  26. Write the pixel data:

    • Use the fwrite() function to write the modified pixel data to the new file.

  27. Close the files:

    • Use the fclose() function to close both the input and output files.

  28. Free allocated memory:

    • Use the free() function to release the memory allocated for the pixel data.

These steps provide a basic outline of how to read and write BMP files using ANSI C. Keep in mind that additional steps may be required depending on the specific requirements of your program.