Hi,
I'd like to have your expertise on writing in random mode - after setting the current pointer with fseek - into an existing binary file. I'm getting somehow confused with a bunch of options for fopen_s, including an "R" (for random), and a "c" to force "hard flushing" into the disk (bypassing the system's buffers), that I read about for the first time. What would be the right function to write - so that to avoid writing byte by byte?
Thanks!
Just a regular fopen() with a mode of "r+b" should suffice.
Then seek to where you want to write, then fwrite() as much data as you please.
Call fflush() if you switch back to reading the file.
> I'm getting somehow confused with a bunch of options for fopen_s, including an "R" (for random), and a "c" to force "hard flushing" into the disk
All of which is non-portable.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
I've tested the optimal configuration: fopen() with "wbc" mode and fwrite() as per the manual. Good performance since fseek() does automatically fflush() prior to any field pointer positionning into the file. Thanks!
