Store a bitmap file as a field in a text file using C/C++
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I am writing an electronic voting system and I want to store the candidate''s photograph as a field in the candidate file along with the candidate''s firstname surname and gender.
How do I store this picture/image as a field in text file using C/C++?
If you want to store the bitmap in the same file as the name, you need to use a binary file, not a text file. And you need to come up with your own format/layout. Here''s an example:
- int: firstname length, including terminating nul
- bytes: firstname, null-terminated string
- int: surname length, including terminating nul
- bytes: surname, null-terminated string
- int: gender (0=male, 1=female)
- int: number of bytes in bitmap data
- bytes: bitmap data
Then you:
- open the file
- read an int - this tells you how many bytes to read for the first name
- read that many more bytes, store the data in the firstname
- read an int - this tells you how many bytes to read for the surname
- read that many more bytes, store the data in the surname
- read an int - this tells you the gender
- read an int - this tells you how many bytes to read for your bitmap info
- read that many more bytes, pass that data to your bitmap handling code.
- int: firstname length, including terminating nul
- bytes: firstname, null-terminated string
- int: surname length, including terminating nul
- bytes: surname, null-terminated string
- int: gender (0=male, 1=female)
- int: number of bytes in bitmap data
- bytes: bitmap data
Then you:
- open the file
- read an int - this tells you how many bytes to read for the first name
- read that many more bytes, store the data in the firstname
- read an int - this tells you how many bytes to read for the surname
- read that many more bytes, store the data in the surname
- read an int - this tells you the gender
- read an int - this tells you how many bytes to read for your bitmap info
- read that many more bytes, pass that data to your bitmap handling code.
You could encode the binary file as text.
You could simply use something like uuencode/uudecode to convert the binary bitmap file to ASCII and back.
I haven''t explicitly dealt with the programs in years though, but this is similar to how many email systems and usenet groups transfer(ed) binary files.
You could simply use something like uuencode/uudecode to convert the binary bitmap file to ASCII and back.
I haven''t explicitly dealt with the programs in years though, but this is similar to how many email systems and usenet groups transfer(ed) binary files.
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