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how to write a struct to a file directly?
Using write and read system call. Following is an example:
blk.h:
#include <stdlib.h>#include <stdio.h>#include <fcntl.h>#include <sys/types.h>#include <sys/stat.h>#include <string.h>struct data{ char s[20]; int d1; char c;};#define BLK_SIZE 25
writeb.c:
#include "blk.h"int main(){ struct data *d= malloc(BLK_SIZE); d->d1= 8; d->c= ‘a‘; strcpy(d->s, "first try.."); int fd= open("blk.dat", O_RDWR | O_CREAT | O_EXCL, S_IREAD | S_IWRITE); write(fd, d, BLK_SIZE); printf("writed!\n"); close(fd); return 0;}
readb.c:
include "blk.h"int main(){ int fd; struct data *d; fd= open("blk.dat", O_RDWR); read(fd, d, BLK_SIZE); printf("%d, %c, %s\n", d->d1, d->c, d->s); close(fd); return 0;}
how to write a struct to a file directly?
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