How to write the struct array into a file and read the second one? read always produces incorrect parameters.

How to write the struct array into a file and read the second one? Now, read always produces a wrong parameter error-Linux general technology-Linux technology and application information. The following is a detailed description. # Include
# Include
# Include
# Include
# Include
# Define BIZ_SIZ 100
# Define FPATH "./students"
Typedef struct
{Char name [10];
Int num;
} DATE;
Int swrite (int n, DATE p [])
{Int x, I = 0;
If (-1 = (x = write (n, p, sizeof (DATE) * 3 )))
{Perror ("write ");
Return-1;
}
Return x;
}
Int sopen (void)
{
Int k;
K = open (FPATH, O_RDWR | O_CREAT | O_TRUNC, 0666 );
If (-1 = k)
{
Perror ("open ");
Return-1;
}
Printf ("File creat sucess! : % D \ n ", k );
Return k;


}
Int sread (int n)
{DATE buf;
Int m;
Lseek (n, SEEK_SET, sizeof (DATE ));
If (0 = (m = read (n, buf, sizeof (DATE ))))
{Perror ("read ");
Return-1;
}
Printf ("% s \ n", buf. name );
Printf ("% d \ n", buf. num );


Return m;
}
Int main (int argc, char * argv [])
{
DATE a [3] = {"xiaomi", 9527 },{ "liaoli", 9528 },{ "siaoer", 9529 }};
Int n;
Char buff [BIZ_SIZ] = {0 };
Printf ("% d \ n", sizeof (DATE ));;
Printf ("% d \ n", sizeof ());
N = sopen ();
Printf ("% d BYTES was write \ n", swrite (n, ));
Printf ("The 2nd struct is: % d \ n", sread (n ));
}