Sort structure problem

Hi there,

I'm using a large structure, and I want to sort it by one of its members, a double variable.
This is the code I would like to implement:

Code:

//RMSD Sort, this one works OK.
qsort(outlib, structs_len, sizeof(res), struct_cmp_by_rmsd);

//then the structure needs to be re-sorted
qsort(outlib, structs_len, sizeof(res), struct_cmp_by_Model);

These are the definitions I'm using,

Code:

int struct_cmp_by_rmsd(const void *a, const void *b)
{
    res *ia = (res *)a;
    res *ib = (res *)b;
    return (int)(1000000.f*ia->rmsd_ext - 1000000.f*ib->rmsd_ext);

    /* float comparison: returns negative if b > a 	and positive if a > b. We multiplied result by 10000.0 to preserve decimal fraction */
}

int struct_cmp_by_Model(const void *a, const void *b)
{
    res *ia = (res *)a;
    res *ib = (res *)b;
    return (int *) ( ia->numModel - ib->numModel );
}

after compiling, I get this error:

Code:

sort_structures.h: In function `int struct_cmp_by_Model(const void*, const void*)':
sort_structures.h:19: warning: cast to pointer from integer of different size
sort_structures.h:19: error: invalid conversion from `int*' to `int'

I could not get this one to work, any help would be really appreciated.
Thanks in advance,

Juan Pablo

Duplicate thread. See Sort structure problem