> > ... The problem is that I can only cast 1 structure to a long
> > and pass it to the callback function. How can I access all 3
> > structures in the callback.
>
> I suggest *not* casting your structure pointer to a long. Remember
> that on some machines longs and pointers are *not* the same length --
> on the DEC Alpha, pointers are 64 bits while a long is only 32 bits!
No. At least not here:
waage:~/C 10>uname -a
OSF1 waage V3.2 148 alpha alpha
waage:~/C 11>./a.out
sizeof(int) : 4
sizeof(long) : 8
sizeof(float) : 4
sizeof(double) : 8
sizeof(long double) : 8
sizeof(void *) : 8
Still, I guess there could exist machines with pointers
longer than long?!
TTFN,
Hans Peter
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