help on copying arrays

Code:

---


typedef struct
{
        char        Jump[ 3 ];
        char        Manufacturer[ 8 ];
        char        BytesPerSector[ 2 ];
} Disk;

---

in a funtion, there is this

Disk *theDisk
char array[40]={'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', .....};

the problem is how do i copy the 3rd element to 8th element of array to the the member ( thDisk->Manufacturer ) of structure Disk?
and then display it on the screen.

thx for the help

Code:

---


#include <stdio.h>
#include <string.h>

typedef struct
{
char Jump[ 3 ];
char Manufacturer[ 8 ];
char BytesPerSector[ 2 ];
} Disk;

// if you use a pointer it must point to something before its used.
Disk* theDisk;
char array[40]={'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', ...};

// make theDisk point to a valid instance of Disk
memcpy(theDisk->Manufacturer, &array[3], 5);

---

thx man
that is helped a lot.

Don't forget, if you're going to use manufacturer as a string, it'll need to be null terminated. I'm guessing the struct is initialised to 0, as per your other thread (if I remember right)? ... which means it'll work OK.

Also, this is close:
>memcpy(theDisk->Manufacturer, &array[3], 5);
but the request was to start at the third element, whereas this starts at the 4th (the index count starts at 0, not 1).

:)