Question

I would like to read from a file into an unsigned character buffer as well as write that information back into a file. I am using an unsigned character buffer because I need to send this information over a UDP socket.

The problem is I can’t seem to find a way to properly read the file from the buffer and write from the buffer.

Can anyone point a way to do this?

Thanks so much

Answer 1

Take a look at write and read functions, or fread and fwrite. They should do the trick.

For example, you write a buffer to a file with:

int fd = open("file", O_CREAT | O_WRONLY, 0600);
write(fd, yourBuffer, numberOfCharactersToWrite);

The write function may return some error codes, so read it’s manual.

fwrite is very similar in usage, look at the site here.