--- ~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.
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