At Friday 1/25/2008 07:55 PM, you wrote:
>--- ~Rick <[EMAIL PROTECTED]> escreveu:
>
> > I am populating a number of entries and want to sort on the field
> > linedata.transferPath. I'm using qsort and have built a comparator
> > function but cannot figure out how to specify the transferPath
> > element.
> >
> > But, I want to sort on an element within a structure. I've tried, and
> > it fails. How can I specify the element to the comparator? (Darn
> > pointers!)? I haven't worked with qsort or comparator functions before.
> >
> > int compareEntry (const void * a, const void * b)
> > {
> > char *a1 = (char *)a;
> > char *b1 = (char *)b;
> > char *a2 = a1.transferPath;
> > char *b2 = b1.transferPath;
> >
> > return (strcmp((char *)a2, (char *)b2));
> > }
>
> The right code is:
>
>int compareEntry (const void * a, const void * b)
>{
> struct ENTRY *e1 = (struct ENTRY*)a;
> struct ENTRY *e2 = (struct ENTRY*)b;
> char *c1 = e1->transferPath;
> char *c2 = e2->transferPath;
>
> return (strcmp(c1, c2));
>}
>
> You may use typedef struct to do not need to type struct before every
>ENTRY.
Thank you. This seems to have done the trick. I
just couldn't seem to get my thoughts focused enough to get this correct.
I had tried the struct->element as well as
struct.element formats but couldn't seem to get the right combination.
Thanks again.
~Rick
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